The concentration of a substance can be expressed using molarity, molality or percent.
What is concentration?The term concentration has to do with the amount of substance present in solution. Now let us solve the problems individually;
a) Number of moles = 0.850 grams/80 g/mol = 0.011 moles
molarity = 0.011 moles/345 * 10^-3 L = 0.032 M
b) Number of moles = 13.5g /58 g/mol = 0.23 moles
molality = 0.23 moles/250 * 10^-3 Kg = 0.92 m
c) Number of moles = 16.5 g/128 g/mol = 0.13 moles
molality = 0.13 moles/54.3 * 10^-3 Kg =2.39 m
d) Total mass present = 12 g + 18 g + 25 g + 500 g = 555 g
mass percent of calcium sulfate = 12 g/555 g * 100/1 = 2.2 %
mass percent of sodium nitrate = 18 g/ 555 g * 100/1 = 3.2 %
mass percent of potassium chloride = 25 g / 555 g * 100/1 = 4.5%
mass percent of water = 500 g / 555 g * 100/1 =90.1%
e) Total mass present = 125 g + 1500g = 1625 g
Mass percent of NaCl = 125 g/1625 g * 100/1 = 7.7%
f) Total volume of solution = 15 L + 28 L = 43 L
percent by volume of acetone = 15 L/43 L * 100/1 = 34.9%
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How many molecules of methane (CH4) do you need to burn in order to get 9.03 x 1023
molecules of carbon dioxide (CO2)? Avogadro's number is 6.02 x 1023 molecules/mol.
CH4 + O2 - CO2 + 2H2O
Answer:
9.03*10^23 molecules CH4
Explanation:
In the equation CH4 + O2 -> CO2 + 2H2O, the molar ratio of CH4 to CO2 is 1:1. It takes 1 mole of CH4 burned to form 1 mole of CO2. If we convert molecules to moles, we do 9.03 x 10^23 divided by 6.02 x 10^23 = 1.5 moles of CO2. Since we know the ratio is 1:1, that meant it would take 1.5 moles of CH4 burned to make that much CO2. So we convert our 1.5 moles of CH4 into molecules by multiplying 1.5 * 6.02 x 10^23 which equals 9.03*10^23 molecules CH4.
Calculate the volume of 2.30 moles of gas exerting a pressure of 2.80 atm at 155°C.
Answer:
28.83dm³
Explanation:
Using ideal gas equation
PV=nRT
P=2.80atm
n=2.30
R=0.082
T=155°C (155+273=428Kelvin)
V=nRT/P
V=2.30×0.082×428/2.80
V=28.83dm³
Which form of water is classified as part of the precipitation phase of the water cycle?
A:lakes
B:vapor
C:rivers
D:snow
Answer:
Snow
Explanation:
Precipitation means when water falls from the sky, and snow is frozen water
Which of the following is not true concerning aluminum?
Group of answer choices
Aluminum weighs twice as much as the same size piece of steel.
It takes about two metric tons of aluminum oxide to produce one metric ton of aluminum.
Aluminum corrodes more slowly than iron does.
It takes about 17,000 kilowatt hours of electricity to produce one metric ton of aluminum.
The statement that is true about aluminum is that it corrodes more slowly than iron does.
What is Aluminum?Aluminum is a slivery white metal that have atomic number of 13. It is most coon metal and make more than 8% of the Earth's core mass. It's also the third most common chemical element Earth. It is malleable and soft.
It is use for making kitchen utensils, cans and so on.
Aluminum cannot be decomposed by chemical methods.
Therefore, The statement that is true about aluminum is that it corrodes more slowly than iron does.
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If the cell is somehow operated under conditions in which it produces a constant voltage of 1.50 V , how much electrical work will have been done when 0.487 mL of Br2(l) has been consumed
For a cell operated to produce a constant voltage of 1.50 V, the electrical work done is mathematically given as
W=2.077*10^{-7}
What is the electrical work done?Generally, the volume of Br2 is mathematically given as
[tex]Vb=\frac{0.38*3.12}{159.809}[/tex]
Vb=7.18*10^-3ml
Therefore, the quantity of charge
q=(1.436*10^-2)*9.644*10^4
q=1.385^{-4}c
In conclusion, work done
W=Eq
W=1.50*1.385^{-4}
W=2.077*10^{-7}
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what is hydrogen alkali metal or halogen
Answer:
Hydrogen is neither an alkali metal or halogen.
Explanation:
It has the properties of both groups and so it's position is uncertain.
What conversion factor would be used to solve the following problem:
Convert 8.99g of CO2 to moles of CO2
A) Molecular weight
B) Avogadro's number
C) Grams
D) Density
A) Molecular weight (MW)
moles = mass : MW
alloy is combined by physically or chemically
Answer:
alloy is the homogeneous mixture of metal and metal or metal and non metal
Answer:
Yes, an alloy is combined physically or chemically into a separate compound. And a mixture of
Explanation:
Alloys have physical properties between those constituent metals and chemical properties remain unaffected. But alloys can be separated physically.
Identify the combustion reaction.
C4H12 + 7O2 ⟶ 6H2O + 4CO2
2H2 + O2 ⟶ 2H2O
Al2S3 ⟶ 2Al + 3S
Cl2 + 2KBr ⟶ 2KCl + Br2
Answer:
2kci,3H12,702,c02g k 4 t v6vuvi
pls i need the correct answer auto report when you're not sure to your answer or its wrong
which of these materials is best used as a lubricant to reduce friction on gears
a.sand
b.oil
c.water
d.alcohkl
need help with this ty
Answer:
The correct answer to first question is C
I only know this one.
Explanation:
PLEASE MARK ME BRAINLIEST IF MY ANSWER IS CORRECT PLEASE
I also kno wtge answer to question 7 is A
Does combining the glue and water create a physical or chemical change?
The combination of glue and water creates a physical change rather than a chemical change.
Physical and chemical changesPhysical changes are changes to the physical properties of materials and are usually reversible.
Chemical changes, on the other hand, are changes to the chemical properties of materials and are usually irreversible.
Mixing water with glue will only result in the glue being diluted with water and creates no chemical reaction. The glue can be recovered by distilling off the water.
Thus, mixing glues with water is only a physical change as the chemical properties of the glue remain intact.
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4. Calculate the total amount of heat a beaker of water would absorb sitting in the sun. The water has a mass of 500g, a specific heat of 4.184 (J/gx°C), and had a change in temperature of 22 °C.
Answer:
46024 j or 46.024 kj
Explanation:
500 gm * 4.184 j/(gm-C) * 22 C = 46024 j
The heat energy absorbed by water of mass 500 g and specific heat capacity of 4.184 J/°Cg with a temperature rise to 22 degree celsius is 46024 J.
What is specific heat capacity?Specific heat capacity of a substance is the heat energy required to raise the temperature of that substance by one degree celsius per mole. It is an intensive property and does not dependent on the total amount if the substance.
Specific heat capacity of a substance is a constant and water have this value of 4.184 J/°Cg. The heat energy q absorbed or evolved from a system is related to the specific heat capacity C , mass M and temperature change ΔT occured on the system as in equation written below:
q = mC ΔT .
The heat energy of water of mass 500 g absorbed for a temperature change of 22 °C can be calculated as follows:
q = 500 g × 22 °C × 4.184 J/°Cg
= 46024 J.
Hence, the total heat of absorption of water for the given mass and temperature change is 46024 J.
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The solubility of magnesium fluoride, , in water is g/L. What is the solubility (in grams per liter) of magnesium fluoride in 0.29 M of sodium fluoride,
Answer:
1.457*10^-8 grams
Explanation:
First we want to find the molar concentration of MgF2. We can do this by dividing 0.016 (the solubility in grams of MgCl2 in a litre of water) by its molar mass (approx. 62.3 grams). Thus, the molar solubility of MgF2 is 2.57*10^-4 M.
Next, we must calculate the Ksp of MgF2. The equilibrium expression is:
MgF2⇄Mg+2F
Thus [tex]Ksp=[Mg^+][F^-]^2[/tex]
This means that, in equilibrium, there are 2.57*10^-4 M of [tex]M^+[/tex] and 5.136*10^-4 M of [tex]F^-[/tex]
Plugging in the above information, our Ksp for MgF2 is approximately 6.78*10^-11
Next we will need to use the RICE table. Since there is already 0.29M of NaF dissolved, there is initially 0.29M of [tex]F^-[/tex].
R: MgF2 ⇄ [tex]Mg^{+}[/tex]+2[tex]F^-[/tex]
I: N/A 0 0.29M
C: N/A +x +x
--------------------------------------------
E: N/A x 0.29+x
To make calculations easier, we will assume that 0.29+x≈0.29
This means that Ksp=0.29x=6.78*10^-11
Therefore, x≈2.338*10^-10M
Multiply that by 62.3 and we get around 1.457*10^-8 grams.
2. What are the main processes by which metamorphic rock is created?
erosion and deposition
melting and volcanic activity
erosion and heat
heat and pressure
If a solution has a poh of 5.2 the [oh-] of the solution is
Answer:
6x10^-6 M
Explanation:
The relationship between pOH and [OH-] is
pOH = -log[OH-]
Solving this equation for [OH-] is
[OH-] = 10^-pOH
Plugging in the pOH makes
[OH-] = 10^-5.2
= 6.31x10^-6
Rounding to 1 sig fig since pOH and pH sig figs are only the number of decimals means to round to 1 sig fig or
6 x 10^-6 M
Which of these are animal adaptations that help animals live in the deciduous forest biome? Select all that apply.
Round builds
Little feet for snow
Harder outer skin to reduce loss of water
Hibernation
Help fast!
Answer:
Hibernation
Explanation:
deciduous means trees that lose leaves during winter
A 76.89 g sample of a hydrocarbon(CxHy) has a mass of hydrogen that is equal to 10.45 g. Given this information, determine the empirical formula of this hydrocarbon. {MMC=12.01 and MMH=1.008}.
I’ll give the fastest person brainliest!!!!!! I need the answer asap!!!
Answer:
the empirical formula will be CH2
Explanation:
C
[tex] = \frac{66.44}{12} \\ = \frac{5.536}{5.536} \\ = 1 \\ = 1 \\ h \\ \frac{10.45}{1} \\ = \frac{10.450}{5.536} \\ = 1.88 \\ = 2[/tex]
A gas occupies a volume of 1.0 L at 25°C. What volume will the gas occupy at 100°C?
A)
4.0 L
B)
0.80 L
C)
1.3 L
D)
1.0 L
Answer:
A
Explanation:
1.0 L * 4 = 4L volume that the gas can occupy at 100 degree Celsius
This figure shows the dimensions of a right triangular prism.
Right prism with triangular base. Height of triangle labeled 2 m and base labeled 3 m. Height of prism labeled 8 m.
What is the volume of the right triangular prism in cubic meters?
144 m3
16 m3
24 m3
48 m3
Answer:
ik that its not 48 because i answerd 48 and i got it wrong and im pretty sure its also not 144
Explanation:
From the calculations and the data given, the volume of the triangular prism is 24 m3.
What is a traingular prism?The trangular prism is a prismatic figure that has a trianguar base. We know that the formula for the volume of a triangular prism is;
V = 1/2 a c h
Now;
a = 2 m
b = 3 m
h = 8 m
V = 1/2 * 2 m * 3 m * 8 m
= 24 m3
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What is the term used to describe why urban areas are warmer than surrounding rural areas?
Question 2 options:
Downtown island effect
Rural cooling effect
Global warming effect
Urban heat island effect
Answer:
urban heat island
Explanation:
occurs when a city experiences much warmer temperatures than nearby rural areas.
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A) Which statement best summarizes the way the sun produces energy? (1 point)
Combustion reactions in the sun release large amounts of chemical energy.
Fusion reactions in the sun release large amounts of chemical energy.
Combustion reactions in the sun convert small amounts of matter into large amounts of energy.
Fusion reactions in the sun convert small amounts of matter into large amounts of energy.
Answer:
1. The combined number of protons and neutrons remains constant.
2. There are two atoms with mass numbers of 2.
3. It is the number of protons plus neutrons.
4. A nucleus with a greater mass than any of the reactants will be produced.
5. Fusion reactions in the sun convert small amounts of matter into large amounts of energy.
Explanation: I couldn't see the comments so I guess some ppl can't either but here you go got them all correct! :)
Th sun produces energy through fusion reaction by converting small amount of matter into larger amounts of energy.
Nuclear fusion in the sunThe sun is able to produce energy because protons of hydrogen atoms present in the sun collide violently in the sun's core and fuse together leading to the formation helium atom.
This process of fussion is referred to as a PP (proton-proton) chain reaction, and it emits an enormous amount of energy
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Describe how you might prepare disodium phosphate given a solution of phosphoric acid, 0.500 molar and a solution of sodium hydroxide base, 0.500molar.
Explanation:
When 2 moles of sodium hydroxide (NaOH) reacts with 1 mole of phosphoric acid (H3PO4) it gives 1 moles disodium phosphate Na2HPO4 and 2 moles of water.
0.5 molar solution indicates half moles of molecules are present in per ltr solution.
to prepare disodium phosphate you need to dilute phosphoric acid solution to 0.25 molar and add equal quantity of 0.5 molar solution.
[tex]2 NaOH + H_3PO_4 \: \rightarrow \: Na_2HPO_4 + 2 H_2O[/tex]
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How many atoms are in 0.560 moles of iron?
Answer:
3.37 × 10²³ atoms
Explanation:
Number of atoms = number of moles × 6.02 × 10²³
Number of atoms = 0.560 × 6.02 × 10²³
Number of atoms = 3.37 × 10²³ atoms
Bonding with intermolecular forces:
1.) is CH3F a hydrogen bonding? yes or no?
2.) is CH3F dipole-dipole interactions? Yes or no?
3.) is CH3F a london dispersion forces? Yes or no?
Explanation:
1.) is CH3F a hydrogen bonding? yes or no? = No, CH3F is not a hydrogen bonding beacuse the molecule lacks hydrogen atoms bonded to nitrogen, oxygen, or fluorine; ruling out hydrogen bonding.2.) is CH3F dipole-dipole interactions? Yes or no? = Yes, CH3F is a dipole-dipole interactions beacuse in it's molecule, there are no metal atoms to form ionic bonds3.) is CH3F a london dispersion forces? Yes or no?= Yes, CH3F is a london dispersion forces because in it's molecule, there are no metal atoms to form ionic bonds .The intermolecular forces present in the bonding of CH₃F are dipole-dipole interactions and London dispersion forces.
1.) No, CH₃F does not exhibit hydrogen bonding. Hydrogen bonding occurs when a hydrogen atom is bonded to a highly electronegative atom such as fluorine, oxygen, or nitrogen. In CH₃F, the hydrogen atom is bonded to carbon, which is not highly electronegative.
2.) Yes, CH₃F exhibits dipole-dipole interactions. Dipole-dipole interactions occur between molecules that have permanent dipoles due to the electronegativity difference between the atoms. In CH₃F, the fluorine atom is more electronegative than the carbon and hydrogen atoms, resulting in a polar molecule with a permanent dipole moment.
3.) Yes, CH₃F exhibits London dispersion forces. London's dispersion forces, also known as Van der Waals forces, are present in all molecules and arise from temporary fluctuations in electron distribution. Although CH₃F has dipole-dipole interactions, it also experiences London dispersion forces due to the temporary shifts in electron density.
Hence, the bonding in CH₃F was explained above.
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Why Hydrochloric acid (HCl) is not an oxidizing agent?
please help I need proper explanation!
Answer:
Strong acids completely dissociate in water to H+ ions and extremely weak conjugate base anions.
Explanation:
its a weak acid
Answer:
because its didn't form H+ ions when react with water
If you have 1.50 moles of Bismuth (11) Sulfate in 0.750 m3, what would be the density of the material?
What is the balanced equation for the redox reaction between zinc and hydrochloric acid (HCl) that forms zinc(II) ions and hydrogen gas? A. 2Zn + HCl + H+ Zn2Cl + H2 B. Zn + 2H+ 2Zn2+ + H2 C. 2Zn + 2H+ 2Zn2+ + H2 + 2e- D. Zn + 2H+ 2Zn2+ + H2 + 2e-
The balanced equation for the redox reaction between zinc and hydrochloric acid (HCl) that forms zinc(II) ions and hydrogen gas is as follows:
Zn(s) + 2H+(aq) → Zn2+(aq) + H2(g)
What is a redox reaction?A redox reaction is a type of chemical reaction in which some of the atoms have their oxidation number changed.
According to this question, the redox reaction between zinc and hydrochloric acid (HCl) forms zinc(II) ions and hydrogen gas. The balanced equation is as follows:
Zn(s) + 2H+(aq) → Zn2+(aq) + H2(g)
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use the equation: 2Mg + O2→ 2MgO
Calculate the number of moles of oxygen needed to react with 6.00 moles of Mg.
Answer:
3 moles of O2 needed
Explanation:
2 moles of Mg to one mole O2
so 3 moles of O2 needed
Draw the Lewis structure for sulfur tetrafluoride, SF4
Notes:-
S has Z=16Electronic configuration
1s²2s²2p⁶3s²3p⁴So
Valency is 4 and 6Three fluorine atoms take 3 electrons and one lone pair present over S As one electron remains unshared so we use + sign .