The percent composition are the percent in mass of each atom in the molecule.
Since we know that the molar mass of the substance is 334.0 g/mol, we can use it to figure out how much of each atom we have per molecule.
Starting from carbon, we know it is 75.42% of the mass.
In 1 mol of the substance, there are 334.0 g, 75.42% of which is from carbon atoms.
So, in 1 mol of the substance, there are the following mass of carbon:
[tex]m_C=334.0g\cdot75.42\%=334.0g\cdot0.7542=251.9028g[/tex]The aromic mass of the carbon atom is 12.0107 g/mol.
That is, in 1 mol of the substance -> 251.9028 g of C.
That mass of carbon is equivalent to:
[tex]\begin{gathered} M_C=\frac{m_C}{n_C} \\ n_C=\frac{m_C}{M_C}=\frac{251.9028g}{12.0107g/mol}=20.97\ldots mol\approx21mol \end{gathered}[/tex]So, in 1 mol of the substance -> 251.9028 g of C -> 21 mol of C. This means that for each molecule of the substance we have 21 atoms of carbon.
Now, we can just repeat the process for Hydrogen, Nitrogen and Oxygen.
Hydrogen has an atomic mass of 1.00794 g/mol, and the percent composition of it is 6.63%, so:
[tex]m_H=334.0g\cdot0.0663=22.1442g[/tex][tex]n_H=\frac{m_H}{M_H}=\frac{22.1442g}{1.00794g/mol}=21.96\ldots mol\approx22mol[/tex]So, for each molecule of the substance there are 22 atoms of hydrogen.
Nitrogen has an atomic mass of 14.0067 g/mol, and the percent composition of it is 8.38%, so:
[tex]m_N=334.0g\cdot0.0838=27.9892g[/tex][tex]n_N=\frac{m_N}{M_N}=\frac{27.9892g}{14.0069g/mol}=1.998\ldots mol\approx2mol[/tex]So, for each molecule of the substance there are 2 atoms of nitrogen.
Oxygen has an atomic mass of 15.9994 g/mol, and the percent composition of it is 9.57%, so:
[tex]\begin{gathered} m_O=334.0g\cdot0.0957=31.9638g \\ n_O=\frac{m_O}{M_O}=\frac{31.9638g}{15.9994g/mol}=1.997\ldots mol\approx2mol \end{gathered}[/tex]So, for each molecule of the substance there are 2 atoms of oxygen.
To summarize, we have, for each molecule of the substance:
- 21 carbon
- 22 hydrogen
- 2 nitrogen
- 2 oxygen
So, the molecular form of the substance is C₂₁H₂₂N₂O₂.
How do the presence or absence of partial charges at the molecular scale help explain a liquid’s ability to dissolve salts?.
The presence of partial charges in a liquid enables the liquid to split the bonds of the salt when dissolved in it. On the other hand, in the absence of partial charges, the liquid won't be able to break bonds apart and dissolve salts in it.
How a liquid dissolves things?
In a liquid such as water the charges are arranged in a such a way that generates partial positive and negative sides on hydrogen and oxygen atoms giving rise to polarity.
So when a substance such as salt is dissolved in water, the partial positive charge attracts the negative side of the salt with a definite force while partial negative charge of liquid pulls the positive charges apart.
In general, the partial charges of the liquid pull apart the charges of the added substance which results in breaking their chemical bonds and dissolving them.
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the average distance from Earth to thr moon is 384,000 kilometers. How long does it take for light to the go from Earth to the moon?
for one second you travel 300,000 kilometers.
Answer:
Explanation:
About 1.3 seconds
It takes light about 1.3 seconds to travel from the moon to the Earth at a distance of 384000 km. This is because the speed of light is about 300000 km/s. So, it takes light about 1.3 seconds to travel from the moon to the Earth.
True or False: In cellular respiration, carbon dioxide and water are the reactants, and fuel and oxygen are the products.
In cellular respiration, carbon dioxide and water are the reactants, and fuel and oxygen are the products, this statement is false.
As in the cellular respiration, the fuel which is glucose and oxygen are the reactants, these react to form ATP, while the carbon dioxide and water are the products formed.
The equation of the reaction of cellular respiration is written as -
C₆H₁₂O₆ + 6 O₂ → 6 CO₂ + 6 H₂O + 25 ATP
glucose + water → carbon dioxide + water + ATP
Carbon dioxide and water are considered as byproducts or waste products. Aerobic respiration uses up the glucose and oxygen which releases the energy or results in the ATP formation.
Therefore, the statement given is false.
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What could happen if the global temperature rises just a few degrees?
Answer:
most things would melt
Explanation:
such as glaciers and ice caps in the arctic and Antarctic, causing many floods etc.
ur welcome
How does a coyote producer consumer decomposer
A coyote is a species considered as a consumer in the food chain because they need to eat other live organisms to survive (Option 2).
What is the role of a consumer in the food chain?The role of consumers in the food chain is to eat other organisms such as plants (in the case of herbivore consumers) or meat (in the case of carnivore consumers). Coyote is a carnivore consumer.
Therefore, with this data, we can see that the role of a consumer in the food chain is to consume (eat) other organisms.
Complete question:
Choose the correct option. A coyote is a ____ producer, consumer, decomposer.
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A piece of copper with a volume of 100cm3 has a mass of 890g. Explain how you could use this information to find out how much mass would be in 13cm3 of copper.
The mass of the 13 cm³ of copper, given that 100 cm³ of it has a mass of 890 g is 115.7 g
How to determine mass of the copperWe'll begin by obtainig the density of the copper. This can be obtained as illustrated below:
Volume of copper = 100 cm³Mass of copper = 890 gDensity of copper =?Density = mass / volume
Density of copper = 890 / 100
Density of copper = 8.9 g/cm³
Finally, we shall determine the mass of the 13 cm³ of copper. This is obatined as follow:
Volume of copper = 13 cm³Density of copper = 8.9 g/cm³Mass of copper = ?Density = mass / volume
Cross multiply
Mass = Density × volume
Mass of copper = 8.9 × 13
Mass of copper = 115.7 g
Thus, the mass of the copper is 115.7 g
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The mass of 13 cm³ of copper with a volume of 100 cm³ has a mass of 890 g is 115.7 grams.
What is mass?Mass is defined as a dimensionless number used to describe the mass of a particle or item.
We'll start by finding out how dense copper is.
Given, Volume = 100 cm³
Mass = 890 g
Density = Mass / Volume
= 890 g / 100 cm³
= 8.9 g/cm³
Now to determine mass is 13 cm³ of copper is
Density = Mass / Volume
So, Mass = Density x Volume
= 8.9 g/cm³ x 13 cm³
= 115.7 grams
Thus, the mass of 13 cm³ of copper with a volume of 100 cm³ has a mass of 890 g is 115.7 grams.
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liquid octane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . suppose 3.4 g of octane is mixed with 20.5 g of oxygen. calculate the minimum mass of octane that could be left over by the chemical reaction. be sure your answer has the correct number of significant digits.
The minimum mass of octane that could be left over is 0.468 grams.
Step 1: Data given
Mass of octane = 3.4 grams
Mass of oxygen = 20.5 grams
Molar mass octane = 114.23 g/mol
Molar mass oxygen = 32.0 g/mol
Step 2: The balanced equation
2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O
Step 3: Calculate the number of moles
Moles = mass / molar mass
Moles octane = 3.4 grams / 114.23 g/mol
Moles octane = 0.0297 moles
Moles O₂ = 20.5 grams / 32.0 g/mol
Moles O₂ = 0.640 moles
Step 4: Calculate the limiting reactant
For 2 moles octane we need 25 moles O₂ to produce 16 moles CO₂ and 18 moles H₂O
O₂ is the limiting reactant. It will completely be consumed (0.640 moles). There will react 0.0320/ 12.5 = 0.0256 moles.
There will remain 0.0297 - 0.0256 = 0.0041 moles octane.
Step 5: Calculate mass octane remaining
Mass octane = moles * molar mass
Mass octane = 0.0041 moles * 114.23 g/mol
Mass octane = 0.468 grams
The minimum mass of octane that could be left over is 0.468 grams.
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Using the periodic table, predict whether the following chlorides are ionic or covalent: SiCl4, PCl3, CaCl2, CsCl, CuCl2, and CrCl3.
The following chlorides are ionic or covalent:
SiCl₄ = covalent
PCl₃ = covalent
CaCl₂ = ionic
CsCl = ionic
CuCl₂ = ionic
CrCl₃ = ionic
SiCl₄ is silicon tetrachloride. SiCl₄ is a covalent. The bond between silicon and chlorine is formed by the sharing of electrons.
PCl₃ is Phosphorous trichloride . PCl₃ is covalent. Phosphorus contain 5 electrons in valence shell and requires 3 more to complete octet and chlorine require one electron to complete octet so, the bond formed is by sharing of electron.
CaCl₂ is calcium chloride. CaCl₂ is an ionic. calcium is metal and metal donates electron to chlorine is non metal and non metal accept electrons and become Ca²⁺ and Cl⁻. The bond formed by the transfer of electrons.
CsCl is cesium chloride. CsCl is an ionic. symbol of ions : Cs⁺ and Cl⁻
CuCl₂ is copper(II) chloride. CuCl₂ is ionic formed by the transfer of electrons. symbol of ions : Cu²⁺ and Cl⁻
CrCl₃ is chromium(III) chloride. CrCl₃ is an ionic. symbol of ions : Cr³⁺ and Cl⁻.
Thus, The following chlorides are ionic or covalent:
SiCl₄ = covalent
PCl₃ = covalent
CaCl₂ = ionic
CsCl = ionic
CuCl₂ = ionic
CrCl₃ = ionic
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PLEASE HELP
Suppose 200.0 g of ice absorb 1255.0 J of heat. What is the corresponding temperature change? Specific heat capacity of ice is 2.1 J/gC.
Considering the definition of calorimetry, if 200.0 g of ice absorb 1255.0 J of heat, the temperature change is 2.988°C.
Definition of calorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change). So, the amount of heat that a body receives or transmits is determined by the following expression:
Q = c×m×ΔT
Where:
Q is the heat exchanged by a body of mass m.c is a specific heat substance.ΔT is the temperature variation.Temperature change in this caseIn this case:
Q= 1255 Jc= 2.1 J/gCm= 200 gΔT= ?Replacing in the definition of calorimetry:
1255 J = 2.1 J/gC× 200 g× ΔT
Solving:
1255 J ÷(2.1 J/gC× 200 g)= ΔT
2.988 °C= ΔT
Finally, the temperature change is 2.988°C.
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what methods are used to address acid mine drainage? burying mine tailings or immersing them in water removing the sulfuric acid before processing the ore adding buffering compounds to neutralize acids exposing the mine tailings to oxygen and sulfur crushing granite to produce silicon dioxide
Adding buffering compounds to neutralize acids is used to address acid mine drainage.
Therefore, the correct option is C.
Adding lime or other alkaline materials to neutralize the acidity of the soil, as well as adding uncontaminated topsoil, planting vegetation, and modifying slopes to stabilize the soil and reduce surface water infiltration into the underlying contaminated material, are some of the common methods for cleaning up contaminated land. The most commonly used technique for treating AMD contamination is the use of alkaline reagents like lime, limestone, sodium carbonate, or sodium hydroxide. The purpose of this process is to neutralize acidic water and prevent the precipitation of heavy metals.
Acid mine drainage (AMD) is a global problem that has negative effects on the ecosystem. Because of its high acidity and high concentration of heavy metals and metalloids, AMD is harmful to both plants and animals as well as to people. Traditional AMD therapies have been in use for a very long time.
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What are water turbines used for?
Answer:
A water turbine is used to convert the energy contained in water, potential energy or kinetic energy, into mechanical or electrical energy. There are two types of water turbines, the reaction water turbine, and the impulse water turbine.
Explanation:
Answer:
Water turbines are used to take energy whether it may be kinetic or potential from the water and convert that energy into mechanical, or electrical energy.
Explanation:
10. Electrical energy is caused by ______
electric ions.
Answer:
Electrical energy is caused by moving
electric ions.
Explanation:
The faster the charges move, the more electrical energy they carry. As the charges that cause the energy are moving, electrical energy is a form of kinetic energy.
help me out please and thank you
What occurs when copper sulfate solution is combined with a piece of silver metal?
If the reaction happens, you should also write the chemical equation in balance.
Reactions to displacement as a first option
A more reactive metal can displace a less reactive metal from a solution in a displacement reaction. The reactivity series of metals can be used to forecast the end products of a displacement process. The metals are arranged according to their reactivity with diluted acids in the reactivity series. A specific metal in the reactivity series may be displaced by metals positioned above it.
In the reactivity series, some of the elements above hydrogen (H) are potassium (K), sodium (Na), magnesium (Mg), zinc (Zn), and others. Several of the metals in the reactivity sequence below hydrogen
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Which of the following is true? Question 1 options:
(A) A person's weight on the moon is less than on Earth, due to the force of gravity.
(B) A person's weight on the moon is the more than on Earth, due to the force of gravity.
(C) A person's weight on the moon is the same as on Earth, due to the force of gravity.
(D) A person's mass on the moon is more than on Earth, due to the force of gravity.
Among the given options, the option A which is A person's weight on the moon is the less than on the Earth, due to the force of gravity, is true.
The weight of a person is usually one-sixth less than their Earth's weight. Only the value of weight fluctuates from Earth to the moon, whereas the mass stays the same on both earth and moon.
This happens due to the gravitational force of the moon. Moon is smaller than the Earth, therefore it has low gravitational forces. Moon's gravitational force leads to the difference in the weights on the Earth and the moon.
The moon of Earth has comparitively less amount of mass than Earth. It is not only small in size than but it also is not as dense as earth. It is only 60 % dense which leads to lower gravitational pull, hence leading to difference in the weight.
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Fernando just entered a drug treatment center for his chemical dependency. He is currently going through a process in which his body is cleared of drugs. What is this process called?
Select one:
a.
Tolerance
b.
Delirium
c.
Withdrawal
d.
Detoxification
According to the research, the correct option is d. Fernando is currently going through Detoxification process in which his body is cleared of drugs.
What is detoxification?This is the treatment aimed at restoring the body's physiological homeostasis after it has been disturbed by the consumption of psychotropic substances as drugs.
In this sense, this process is carried out under the supervision of specialists in the treatment of addictive behaviors.
Therefore, we can conclude that Detoxification is a process of eliminating drugs or substances harmful to health to achieve physiological stability in the body.
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what is the L W H OF THIS CUBE
Answer:
This is NOT a CUBE..
now Considering that one side of one small block is equal to 1 unit.
Then
Length = 3 units
Width = 3 units
Height = 4 units
Please tell me if this is correct
Length would be 3 units, Height is 4 units, and Width is I want to say 5 or 6 not truly sure
Five liters of hydrogen gas are stored at a pressure of 400
torr. If the temperature does not change, what will be the
volume of the gas when the pressure is decreased to 250
torr?
Five liters of hydrogen gas are stored at a pressure of 400 torrs. If the temperature does not change, then the volume of the gas would be 8 liters when the pressure is decreased to 250 torrs.
What is an ideal gas?It is an imaginary gas for which the volume occupies by it is negligible, this gas does not exist in a practical situation and the concept of an ideal gas is only the theoretical one,
Using the Boyle's law for the given problem,
P₁V₁=P₂V₂
400 × 5 = 250 × V₂
V₂ = 400 × 5 / 250
= 8 Litres
Thus, if the temperature does not change the volume of the gas would be 8 Litres.
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Predict the product, write the balanced chemical reaction, including states of matter, for each set of starting materials lithium sulfide
A synthesis reaction is a reaction in which two compounds come together to form one. In this case, if the product is lithium sulfide, the reactants will be lithium and sulfur. Lithium in its natural form is solid, and sulfur also has a solid-state. Lithium sulfide is also a solid compound. The synthesis reaction will be:
[tex]Li_{(s)}+S_{(s)}\rightarrow Li_2S_{(s)}[/tex]Now, we have to balance the equation. We have two atoms of Li on the products side and 1 atom of Li on the reactants side. So, we put the coefficient 2 in Li molecules.
[tex]2Li_{(s)}+S_{(s)}\rightarrow Li_2S_{(s)}[/tex]Now, we have the balanced equation of the synthesis reaction of Lithium Sulfide
Is the exoplanet like earth in terms of its distance from its star? Explain your answer
The distance between the earth and star = 8 ✕ (9.46 ✕ 1012) = 7.6 ✕ 1013 km.
What is exoplanet?
Every planet in our solar system orbits the Sun. Planets known as exoplanets orbit other stars. It is quite challenging to directly observe exoplanets with telescopes. They are hidden by the bright light from the stars they orbit.
It is challenging to give distances in kilometers for many celestial objects since they are so far away from the earth, such as galaxies or stars.
How far light may travel in a year is measured in large units called light-years. The vast distances are therefore expressed in terms of light-years.
9.46 x 1012 kilometres make up a light year.
In other words, if a star is eight light-years away, light would travel that distance in eight years. This is how the distance between a star and the earth is calculated.
Therefore, the distance between the earth and the star is 8 (9.46 1012) = 7.6 1013 kilometers.
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which statements correctly describe a polar covalent bond? i. electrons are shared but not equally by the two atoms. ii. one atom has a small negative charge, and the other atom has a small positive charge. iii. the bond dipole is zero. iv. one or more electrons are transferred from one atom to a second atom.
A covalent bond bond is appropriately described as occurring when one or even more electrons move of one atom to another.
what is covalent polar bond?a bond in which the two bound atoms' electron densities are unequally distributed as a result of either a difference in the electronegativity or the effects of induction.
A covalently bonded bond is represented by the water molecule, written as H2O. The oxygen atom is given more time with the electrons than for hydrogen atoms due to the unequal distribution of the electrons.
what is electron?The electron is an unit of matter with a negative zero elementary charge electric charge. Due to their lack of known components, electrons, which are part of the first generation of lepton particles family, are typically regarded to be elementary particles or substructure
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What number helps us identify the element?
Answer:
The Atomic Number
Explanation:
The atomic number is the number of protons of an atom in its nucleus.
Each element has a unique atomic number.
(view screenshot too, to find where it is in element table)
The patient has a bone density of 1200mg/cm^3 what is the mass of 39.5cm^3 sample
Answer:
47,400 mgExplanation:
The mass of the bone sample can be found by using the formula
mass = density × volume
From the question
density = 1200mg/cm^3
volume = 39.5cm^3
We have....
mass = 1200 × 39.5 = 47400
We have the final answer as
47,400 mgHope this helps you
Pretest: Unit 1
Question 3 of 42
Which of the following is an example of engineering, not science?
Which of the following is an example of engineering, not science?
OA. Predicting the precipitate formed during a chemical reaction
OB. Adding lime to adjust the acidity of a lake
OC. Developing a machine to control the rate of a reaction
OD. Determining the relative reactivity of two metals
SUBMIT OA. Predicting the precipitate formed during a chemical reaction
OB. Adding lime to adjust the acidity of a lake
OC. Developing a machine to control the rate of a reaction
OD. Determining the relative reactivity of two metals
SUBMIT
Correct option is OC- Developing a machine to control the rate of a reaction according to engineering
What is engineering?
Engineering is a field that has been performed for thousands of years, but STEM education, which attempts to engage students with science, technology, engineering, and mathematics, includes it as a component.
The Parthenon, Stonehenge, and the Pyramids of Giza, among other places, are instances of engineering. However, modern engineers work in a variety of fields in addition to erecting structures.
Engineers work on a variety of things, including as cell membranes, building materials, prosthetics, increasing the efficiency of engines and vehicles, and creating renewable energy sources.
Correct option is OC- Developing a machine to control the rate of a reaction according to engineering
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How many grams of sodium fluoride are needed to prepare a 0.600m NaF solution that contains 600.0 g of water? Show your work.
Molality (W) is the ratio of the amount of substance of a solute (in moles – n) to the mass in kilograms of the solvent (m1). It can be calculated by the following formula:
W = n/m1
Step 1 - Let's discover how many moles of sodium fluoride is needed first.
Let's transform 600 g of water to kilograms:
1 g = 0.001 kg
600 g = 0.6 kg
W = 0.600m
m1 = 0.6
0.600 = n/0.6
n = 0.36 moles of sodium floride
Step 2 - Let's transform 0.36 moles of NaF into grams. Let's use the following formula: mass = moles x molar mass
molar mass of NaF = 42 g/mol
mass = 0.36 x 42
mass = 15.12 g
Answer: 15.12 g of NaF
i really need the ansewer so whats the answer?
Energy was lost by substance A to the environment is the statement which best supports the data in the table and is denoted as option D.
What is Energy transfer?This is referred to as the processes which is characterized by the movement of energy from one system to another an an example is heat energy transfer which have different techniques such as conduction, convection etc.
Temperature on the other hand is the measure of the degree of hotness or coldness of a substance and is influenced by heat energy.
From the graph, we can deduce that substance has a temperature which was decreasing with time while substance B has a temperature which was constant throughout.
This therefore means that Energy was lost by substance A to the environment hence ,the reason why option D was chosen as the correct choice.
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the amount of iron in an iron ore can be quantitatively determined by titrating a solution of the unknown with a standard solution of dichromate. the net ionic equation is: redox titration.gif the titration of 25.0 ml of an iron(ii) solution required 18.0 ml of a 0.150 m solution of dichromate (cr2o72-) to reach the equivalence point. what is the molarity of the iron(ii) solution?
According to the given statement The molarity of the iron(II) solution is 0.648 M.
What is molarity?The amount of the sample in a specific solution volume is defined as its molarity (M). The molarity of a solute per litre of a solution is known as molarity. The molar concentration is yet another name for molarity.
Briefing:Iron(II) solution volume (V₁) = 25.0 mL/0.025 L
Dichromate solution (V₂) has a volume of 18.0 mL, or 0.018 L.
Dichromate solution molarity (M₂) = 0.150 M
Molarity of dichromate solution is :
M₂ = n₂/V₂
(n₂ = M₂* V₂ = 0.150 * 0.018 = 2.7 * 10⁻³ mol
Complete balanced equation is given below.
[tex]6 \mathrm{Fe}^{2+}(a q)+\mathrm{Cr}_2 \mathrm{O}_7^{2-}(a q)+14 \mathrm{H}^{+}(a q) \rightarrow 6 \mathrm{Fe}^{3+}(a q)+2 \mathrm{Cr}^{3+}(a q)+7 \mathrm{H}_2 \mathrm{O}[/tex]
It is obvious from the equation that 1 mole of dichromate is needed to make 6 moles of iron(II) solution.
Therefore, we calculate the number of moles of iron(II) solution using the unitary technique.
1 mole of dichromate is equal to 6 moles of iron (II)
6n₂ moles of iron are equal to n₂ moles of dichromate (II)
=6 * 2.7 * 10⁻³ = 0.0162 mol Fe²⁺
So, 0.0162 moles of iron(II) is needed. Therefore,
Now, molarity of iron(II) solution is given as: n[tex]_1[/tex] = 0.0162
Molarity = Moles ÷ Volume
M₁ = n[tex]_1[/tex]/V₁
M₁ = 0.0162mol/0.025 L = 0.648 M
The molarity of the iron(II) solution is 0.648 M.
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The complete question is -
The titration of 25.0 mL of an iron(II) solution required 18.0 mL of a 0.150M solution of dichromate to reach the equivalence point. What is the molarity of the iron(II) solution?
your calibration curve will be generated using absorbance and concentration data. however, you collected %transmittance data in the lab. could you use a plot of %transmittance versus concentration to generate a calibration curve? why or why not?
A calibration curve is used to calculate the limit of detection and the limit of quantitation, as well as the concentration of an unknown material.
What is callibration curve?The concentration of an unidentified drug can be determined using a calibration curve. Researchers and developers can use these curves to determine where an unidentified substance plots by comparing them to data points of known drugs at various doses.
A calibration curve is used to calculate the limit of detection and the limit of quantitation, as well as the concentration of an unknown material. The instrument response to a series of standard samples at various concentrations is used to produce the curve.
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Why does Radium have a lower ionization energy than Barium
Radium have a lower ionization energy than Barium because electrons are closer to the nucleus
What is ionization energy?
Ionization energy can be simply stated as a measurement of an atom's or ion's inclination to give up an electron or of how challenging it is to remove an electron from them. An electron is often lost when a chemical species is in its ground state.
The atom displays a smaller radius than anticipated and the s electrons are more challenging to expel because these electrons are located nearer the nucleus. The first ionization enthalpy of Radium is higher than that of Barium.
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when copper is heated with an excess of sulfur, copper(i) sulfide is formed. in a given experiment, 0.0970 moles of copper was heated with excess sulfur to yield 6.43 g copper(i) sulfide. what is the percent yield?
The percent yield is 83.29%.
What Is percent yield?The real yield is calculated as the theoretical yield divided by the theoretical yield multiplied by 100. % Yield = (Actual Yield % Theoretical Yield × 100%) Many factors can cause a chemical reaction's actual yield to be lower than its theoretical yield.
Numbers of moles copper = 0.0970 moles
Mass of copper(I) sulfide = 6.43 grams.
Balanced equation
2Cu + S ⇒ Cu₂S
Calculate moles of Cu₂S
To create 1 mol of Cu2S from 2 moles of Cu, we require 1 mole of S.
For 0.0970 moles Cu we'll have 0.0970 / 2 = 0.0485 moles
Calculate mass of Cu₂S
Mass Cu₂S = moles Cu₂S × molar mass Cu₂S
Mass Cu₂S = 0.0485 moles × 159.16 g/mol
Mass Cu₂S = 7.72 grams
Calculate percent yield
Percent yield = (actual yield/ theoretical mass) × 100%
Percent yield = (6.43grams / 7.72 grams) × 100%
Percent yield = 83.29 %
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4.00 g of solid sodium hydroxide is added to water to make a solution with a concentration of
0.200 mol/ dm3
What is the volume of water used?
The volume of water used is 500cm^3.
The volume of water used.
NaOH concentration in mol/dm^3=NaOH concentration in g/dm^3/molar mass of NaOH.
M of NaOH=23+16+1=40
M=40 g/mol
0.2mol= concentration of NaOH in g/dm^3/40g/mol
=0.2mol/dm^3*40g/mol
=8g/dm^3
we know that,
1dm^3=1000cm^3
4.00g of NaOH will be dissolved in 4g*1000cm^3/8g
=500cm^3 of water
So, the volume of water used is 500cm^3.
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Answer:
20cm³
Explanation:
Volume = Molarity*number of moles
number of moles = Mass given/Molar mass
number of moles= 4.00g/40.0g
number of moles= 0.1mols
thus:
Volume= 0.200mol/dm³*0.1mol
Volume= 0.02dm³(20cm³)