Question

If a sample of gas occupies 400 ml at a pressure of 800 mm Hg, what will be it’s volume if the pressure is reduced to 700 mm Hg

Answer 1

We have to calculate volume of gas at 700 mm Hg pressure.

The answer is 457.14 ml.

The pressure can be calculated by using Boyle's law. At constant temperature, for a given mass of an ideal gas pressure is inversely related to volume.

As per Boyle's law, P₁V₁ = P₂V₂, where P is pressure and V is volume of gas.

Given, P₁= 800 mm Hg, V₁= 400 ml and P₂= 700 mm Hg, V₂=?

800 X 400 = 700 X V₂

So, V₂= (800X400)/700 = 457.14 ml