Question

State and explain Avogadro's law

Answer 1

Equal volume of gases at the same temperature and pressure should contain equal no of molecules.

Answer 2

Answer:

Avogadro's hypothesis is:

At constant temperature and pressure, equal volumes of all gases contain same number of molecules.  Thus, according to the law, for an ideal gas, there is a direct proportionality between number of moles and volume, when the temperature and pressure remains constant.

Explanation:

Avagadro's hypothesis is defined by

It is written as:

$v \propto n$

$\frac{v}{n}=k$

In this expression,

n = number of moles present in the gas.

V = Volume of the gas.

k = proportionality constant.

So, when the amount of moles for a gas increases, there is proportionate increase in volume. If the quantity of moles decreases, then the volume correspondingly decreases.  

From the above expression, it can thus be seen that:

$\frac{V_{1}}{n_{1}}=\frac{V_{2}}{n_{2}}$

This implies that, for two different gases with equal volumes, but same conditions of temperature and pressure, the amount of the gas will be equal.