A 1.50-L vessel is filled with helium at 25.0 °C and 3.04 atm. Under these conditions, the mass of helium is 0.744 g.
What is an ideal gas?An ideal gas is that whose particles have negligible volume and intermolecular forces.
A 1.50 L vessel at 25.0 °C contains He at a pressure of 3.04 atm.
Step 1. Convert 25.0 °C to Kelvin.We will use the following expression.
K = °C + 273.15 = 25.0 + 273.15 = 298.2 K
Step 2. Calculate the moles of He.We will use the ideal gas equation.
P × V = n × R × T
n = P × V / R × T
n = 3.04 atm × 1.50 L / (0.0821 atm.L/mol.K) × 298.2 K = 0.186 mol
Step 3. Calculate the mass of He.The molar mass of He is 4.00 g/mol.
0.186 mol × 4.00 g/mol = 0.744 g
A 1.50-L vessel is filled with helium at 25.0 °C and 3.04 atm. Under these conditions, the mass of helium is 0.744 g.
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Select the correct answer from the drop-down menu. a scientist digs up sample of arctic ice that is 458,000 years old. he takes it to his lab and finds that it contains 1.675 grams of krypton-81. if the half-life of krypton-81 is 229,000 years, how much krypton-81 was present when the ice first formed? use the formula n = n0 . the ice originally contained grams of krypton 81.
The original mass of krypton 81 that is present in the ice is 6.70 grams.
How do we calculate original mass?Original mass of any substance will be calculated as below for the decomposition reaction is:
N = N₀(1/2)ⁿ, where
N = remaining mass of krypton-81 = 1.675g
N₀ = original mass of krypton-81 = ?
n will be calculated as:
n = T/t, where
T = total time period = 458,000 years
t = half life time = 229,000 years
n = 458,000/229,000 = 2
Now putting all these values on the above equation, we get
N₀ = 1.675 / (1/2)²
N₀ = 6.70 g
Hence required mass is 6.70 g.
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In one to two sentences, describe characteristics of a high-pressure system.
i give brainlist
pls answer in your own words
Answer:
A high pressure area is an area where the air sinks. As it does, it warms up by the adiabatic effect of a greater pressure and that causes the clouds to evaporate, giving place to a clear sky
Explanation:
A high-stress area, high, or anticyclone, is a location in which the atmospheric stress on the surface of the planet is more than its surrounding environment.
What are the traits of the high-pressure system?In a high-Pressure system, it has better pressure in its center than in the regions around it. Winds blow away from excessive pressure.
Swirling withinside the contrary route from a low-stress system, the winds of an excessive pressure system rotates clockwise north of the equator and counterclockwise south of the equator.
Hence, these are the characteristics of high-pressure system.
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What is the pressure in a 8.00 L tank with 50.5 grams of chlorine gas at 365 K?
The pressure in the 8.00 L tank with 50.5 grams of chlorine gas at 365 K is 2.66 atm.
What is pressure?Pressure can be defined as the force acting prpendicular per unit surface.
To calculate the pressure of chlorine gas, we use the formula below.
Formula:
PV = nRT.................. Equation 1Where:
P = PressureV = Volumen = number of moles of chlorine gasR = Molar gas constantT = TemperatureMake P the subject of the equation
P = nRT/V............ Equation 1From the question,
Given:
T = 365 KR = 0.0821 L.atm.K⁻¹.mol⁻¹V = 8 Ln = 50.5/(35.5×2) = 0.711 molesSubstitute these values into equation 2
P = (0.0821×365×0.711)/8P = 2.66 atmHence, The pressure in the 8.00 L tank with 50.5 grams of chlorine gas at 365 K is 2.66 atm.
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Solid calcium carbonate reacts with hydrochloric acid, forming aqueous calcium chloride, carbon dioxide
gas, liquid water
help balance
Answer:
When hydrochloric acid comes into contact with calcium carbonate, the following chemical reaction ensues: CaCO3 + 2HCl → CaCl + CO2 + H2O, which provides acid neutralization alongside the formation of byproducts
Answer:
C) liquid
Explanation:
edge 2023
Translate the world equation in skeleton equation and balance them
(I) Hydrogen+chlorine= Hydrochloric acid
(II) potassium+chloride= potassium chloride+oxygen
Answer:
The balanced equation is: H2 (g) +Cl2 (g) →2HCl (g)
Explanation:
Balancing chemical equation refers to balancing the stoichiometric coefficients on the reactants and products side. This must be done as the chemical equation obeys the law of conservation of mass and momentum.
The representation of a chemical reaction in the form of substances is known as a chemical equation. The equation in which the number of atoms of all the molecules is equal on both sides of the equation is known as a balanced chemical equation. The Law of conservation of mass governs the balancing of a chemical equation.
Given chemical equation
The balanced chemical equation for the hydrogen + chlorine -> Hydrogen Chloride.
H2 + Cl2 → 2HCl
The equation is balanced as on the reactants side there are two hydrogens present and the same on the products side. For chlorine as well the same thing goes two chlorine atoms on the reactants side and two on the products side.
What is the definition of genetic trait
The genetic constitution of an individual, group, or class.
Explanation:
transmission of mechanisms of inherited characteristics of organisms
Answer:a trait that can be passed down is within your gens Evan if you don’t show the trait you still have the ability to pass it down
Explanation:
PLEASE HELP!!!! WILL MARK BRAINLIEST! A balloon is filled with 257.88 L of gas at STP. When the balloon is cooled to -20.5°C, and the pressure decreased to .40 atm, what will the volume of the balloon be?
Answer:
3.97 psi
Explanation:
The new pressure can be found by using the formula for Boyle's law which is
P1 V1 = P2 V2
Which property describes a mixture? select three options. it can be separated by physical methods. it has a single chemical composition. it can appear different from different sources. it cannot be described by a chemical symbol or formula. it cannot have more than one state of matter.
The property of mixture which describes a mixture are it can be separated by physical methods, it can appear different from different sources and it cannot be described by a chemical symbol or formula.
What are mixtures?Mixtures are the compounds which are formed by the addition or combination of one or two elements or compounds.
As in the mixtures many states of matters are present and it will be filtered by using various physical methods, and it is not chemically shown by single chemical symbol or formula. Mixtures are also of two types:
Homogeneous mixtures are those in which equal compositions all over the volume is present.Heterogeneous mixtures are those in which different composition all over the volume is present.Hence options (1), (3) and (4) are correct.
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How many liter are in 55.5 grams of neon?
what is the result of cell division that includes mitosis?
A. new cells with different chromosomes
B. four cells with new chromosomes
C. two identical new cells
D. one genetically different cell
Answer:
I think C is the answer
Explanation:
because Mitosis results in two identical daughter cells......
How do I know the numerical subscript of an element? for example CuCl 2
Cu is copper (II), how do we know its roman number is 3
Answer:
"The Roman numeral denotes the charge and the oxidation state of the transition metal ion. For example, iron can form two common ions, Fe2+ and Fe3+. To distinguish the difference, Fe2+ would be named iron (II) and Fe3+ would be named iron (III)."
Explanation:
In chemistry, Roman numerals are used for a specific group of elements called transition metals. The Roman numerals indicate the charges that these metals carry in a compound.
Can someone help me explain three features that make Lake Baikal one of the most unique lakes in the world.
Explanation:
1,it's crystal clear water and unique wild life.
2,It is home to many unique species animals and plants.
3, It's sediment have not been scoured by overriding continental ice sheet
What is the boiling point of water at standard atmospheric pressure?
Answer:
about 100 degrees Celsius
Explanation:
i dont cap
Which additional product balances the reaction H2SO4 + 2NaOH → Na2SO4 + ________?
2H2O
2OH
H2O2
H3O
Answer:
2H2O
It's a double displacement reaction
Write down the structural formula for the monomer from which
polyvinyl chloride is derived.
(2)
Give the name of the monomer.
Answer:
Vinyl chloride is an organochloride with the formula H2C=CHCl that is also called vinyl chloride monomer (VCM) or chloroethene. This colorless compound is an important industrial chemical chiefly used to produce the polymer polyvinyl chloride (PVC).
Explanation:
Answer:
CH2=CHCl
Explanation:
An impure sample of potassium hydrogen phthalate was titrated to determine the percent composition KHP. What is the percentage of potassium hydrogen phthalate if 2.81 g of the mixture required 35.61 mL of 0.152 mol/L NaOH to reach the end point
For an impure sample of potassium hydrogen phthalate, the percentage of potassium hydrogen phthalate is
m'=39.3%
What is the percentage of potassium hydrogen phthalate if 2.81 g of the mixture required 35.61 mL of 0.152 mol/L NaOH to reach the end point?Generally, the equation for the mol base is mathematically given as
mol base = M*V
mol base = 0.152*35.61
mol base = 5.41272 mmol
In conclusion
mass = mmol/1000*MW
m== 5.41272 /1000*204.22
m= 1.1053 g of KHP
Hence, m'=39.3%
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Magnesium + ... → Magnesium chloride + ....
Mg + HCl → MgCl_2 + H_2
(─.─||）
Answer:
Magnesium + hydrochloric acid → Magnesium chloride + hydrogen gas
Explanation:
acid + reactive metal (magnesium) → salt + hydrogen gas
Which type of bond forms when two or more atoms share electrons?.
Answer:
Covalent
Explanation:
Covalent is the sharing of electrons and Ionic is transferring of electrons.
Answer:
Covalent bonds
Explanation:
the interatomic linkage that results from the sharing of an electron pair between two atoms
In order to make a covalent bond, the orbitals on each atom in the bond must overlap.
Answer:
true
Explanation:
Covalent bonds are formed through the overlap of half-filled valence orbitals. Because of the overlapping, it is most probable that electrons are located within the region of the bond.
In order to make a covalent bond, the orbitals on each atom in the bond must overlap. Therefore, the given statement is true.
What is covalent bond?A covalent bond is an electron exchange usually results in the production of electron pairs between atoms. These electron couples are referred to as bonding pairs as well as sharing pairs. Covalent bonding seems to be the permanent equilibrium of atoms' forces of attraction versus attraction when atoms share electrons.
Because to electron sharing, each atom in a number of molecules can achieve the corresponding amount of the valence shell, resulting inside a stable electronic configuration. In organic chemistry, covalent bonds are far more common than ionic ones. In order to make a covalent bond, the orbitals on each atom in the bond must overlap.
Therefore, the given statement is true.
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Please help with this answer!
[tex]\qquad\qquad\huge\underline{{\sf Answer}}♨[/tex]
The Correct choice is : D
if temperature is held constant, then they have same average kinetic Energy because there's no change in energy caused by transfer of heat or something.
According to the forces of attraction, if temperature is constant the particles have the same average kinetic energy.
What are forces of attraction?Forces of attraction is defined as a force by means of which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in case of gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as the melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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The main purpose of the endocrine system is to produce:
A.
white blood cells.
B.
hemoglobin.
C.
neurons.
D.
hormones.
Answer:
hormones or D
Explanation:
:-)
Answer:
D. Hormones
Explanation:
Endocrine glands release hormones into the bloodstream. This lets the hormones travel to cells in other parts of the body.
NO LINKS PLEASE! Why does dye dropped into a cup of water eventually spread throughout the water?
A. The water has lattice vectors.
B. The water undergoes a phase transition.
C. The water particles and dye particles exhibit Brownian motion.
D. The water exerts pressure on the container.
Answer:
C
Explanation:
okay, you need to look at the structures of the particles of matter in the solid, liquid and gas.
particles in a solid are in fixed positions, where they can only vibrate in those positions ( take a look at ice, or rather, a brick)liquids have very small or rather, no spaces between them, but they can slide or rub against each other, like people in a really tight crowd I guessgas particles have very large spaces between them and they move randomly. these exibit what's called brownian motion.since water particles (and all other liquid particles) have negligible spacings and limited movement, that allows the dye particles to move from a region of high concentration to that of a low concentration. the aim for this is for the mixture/solution to reach an equilibrium, that is the mixture must get to a point where all regions have the same concentration of the dye.you can refer to your coursebooks :)
correct where wrong please:)
Will give brainliest
sorry i know this:
4. 2 methyl 2 heptene
What is another name for a Grasshopper?
Answer:
The scientific name of the grasshopper is Caelifera.
Explanation:
hope this helps.
Answer:
caelifera
Explanation:
that’s the scientific name >_<
At what minimal temperature is the following reaction, the reduction of magnetite by graphite to elemental iron, spontaneous?
Fe3O4(s)+2C(s,graphite)→2CO2(g)+3Fe(s)
The values of enthalpy change, entropy change and temperature all determine the spontenity of a reaction.
What is a sponteanous reaction?A sponteanous reaction is one which has the change in free energy as negative. We know that ΔG = ΔH - TΔS. The spontenity of a reaction depends on;
i. enthalpy change
ii. entropy change
iii. temperature
Since the values in the qestion are not given, the question is incomplete and we can not obtain a numerical value in order to decide the sponteanity of the reaction.
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How many moles of potassium sulfate would you need to prepare 1200 grams of 5.0% potassium sulfate (m/m) solution? Select one: a. 0.34 mols b. 60 mols c. 3.4 mols d. 174 mols
Answer:
The moles of potassium that you would need to prepare 1200 g of 5% potassium sulfate solution is 1.538 moles
the number of cobalt atoms in 0.00103 mole of cobalt
How do you figure out the number of protons in an atom?
How do you figure out the number of protons in an atom?
Answer:
Atomic number shows u the amount of protons there are in the atom
The protons are equal to the number of electrons
The group number tells you the number of electrons on the outer shell
(Sorry if u didn’t want the extra info but really it’s simple like magnesium has 12 so it has 12 protons/ 12 electrons)
Answer:
To calculate the numbers of subatomic particles in an atom, use its atomic number and mass number:
1. number of protons = atomic number.
2. number of electrons = atomic number.
3.number of neutrons = mass number - atomic number.
A chemist dilutes a 1.0 ml sample of 2.0 m kno3 by adding water to it. if the concentration of the solution that is obtained is 0.0080 m, what is its volume? use m subscript i v subscript i equals m subscript f v subscript f.. 125 ml 250 ml 500 ml 2,000 ml
A chemist dilutes a 1.0 ml sample of 2.0M KNO₃ by adding water to it. If the concentration of the solution that is obtained is 0.0080 m, then its volume is 250mL.
How do we calculate volume?Volume for the given equation will be calculated by using the below equation as:
M₁V₁ = M₂V₂, where
M₁ = molarity of KNO₃ = 2M
V₁ = volume of KNO₃ = 1mL
M₂ = molarity of final solution = 0.0080M
V₂ = volume of final solution = ?
On putting these values on the above equation, we get
V₂ = (2)(1) / (0.0080) = 250mL
Hence option (2) is correct.
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Answer:
B. 250 mL
Explanation:
Correct on Edge 2022!!!
Good luck everyone, you got this! Have a great day!
1. Define the unit 'mole'
Answer:
Below
Explanation:
The mole, symbol mol, is the SI base unit of amount of substance. The quantity amount of substance is a measure of how many elementary entities of a given substance are in an object or sample