According to Avogadro's law, as the number of moles of gas increases, what happens to its volume?
Avogadro's Law states that the volume of a gas is directly proportional to the number of moles (or number of particles) of gas when the temperature and pressure are held constant. The mathematical expression of Avogadro's Law is: (11.8.1) V = k × n. ⇒ According to Avogadro's law. The product of the gas constant and the molecular mass of an ideal gas is constant the sum of partial pressure of the mixture of two gases is sum of the two equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules all of the above.
1 Answer
According to Avogadro's law, as the number of moles of gas increases the volume also increases.
Explanation:
Avogadro Law gives the relationship between volume and amount when pressure and temperature are held constant. Remember amount is measured in moles. Also, since volume is one of the variables, that means the container holding the gas is flexible in some way and can expand or contract.
If the amount of gas in a container is increased, the volume increases.
If the amount of gas in a container is decreased, the volume decreases.
Suppose the amount of gas is increased. This means there are more gas molecules and this will increase the number of impacts on the container walls. This means the gas pressure inside the container will increase (for an instant), becoming greater than the pressure on the outside of the walls. This causes the walls to move outward. In this process the volume of gas has increased.
Suppose the amount is decreased. This means there are less gas molecules and this will decrease the number of impacts on the container walls. This means the gas pressure inside the container will decrease (for an instant), becoming lesser than the pressure on the outside of the walls. This causes the walls to move inward. In this process the volume of gas will decrease.
The mathematical form of Avogadro's Law is: V ÷ n = k
Volume taken up by gas at fixed pressure and temperature directly depends on its number of moles. The greater are the number of moles of a gas , the higher will be its volume and vice versa.
Related questions
How does Avogadro's law explain Gay - lussac's law of combining volumes?
Solution
Explanation of Gay -Lussac's Law: Gay -Lussac had experimentally determined that one volume of hydrogen and one volume of chlorine react to produce two volumes of hydrogen chloride gas.
According to Avogadro's law, if :
1 volume of hydrogen contains n molecules of the gas then 1 volume of chlorine also contains n molecules of the gas. Therefore 2 volume of hydrogen chloride
contain 2n molecules of the gas.
H2 + Cl2 → 2HCI
1 vol 1 vol 2 vol (by Gay -Lussac)
n n 2n (By Avogadro)
According To Avogadro's Law The Volume Of Gas
but hydrogen and chlorine are diatomic.
So, 2 atoms + 2 atoms → 2 molecules
1 atom + 1 atom → 1 molecu le
i .e. 1 molecule of hydrogen chloride is formed when 1 atom of hydrogen combines with 1 atom of chlorine. Thus Avogadro's law explains Gay -Lussac's law of
combining volumes.
According To Avogadro's Law The Volume Of A Gas