Question

A chemist adds a sample of an ideal gas to a balloon and measures its volume. The chemist removes some of the gas from the balloon and measures its volume again. If the chemist removes 27% of the gas from the balloon, and the pressure and temperature of the gas do not change, what happens to the volume of the balloon?

The volume will _____________ by _______ %.

Answer 1

According to Avogadro's law: V$\propto$n (at constant P & T)

i.e. At constant pressure and temperature, the volume of the gas is directly related to its no. of moles.

Here, 27% of the gas is removed from the balloon, i.e. the no. of moles of gas decreases by 27%.

Hence, the volume will decrease by 27%.