Question

A gas occupied 20 litre of volume under stp . what will be its volume if the pressure is incresed four times keeping the temperature constant

Answer 1

Since, temperature is constant,
therefore, the formula which will be used is
P1×V1=P2×V2

P1=760mmHg
V1=20 litres
P2=760×4=3040 mmHg
V2=?

So,

760×20=3040×V2

760×20/3040=V2

Therefore, V2=5 litres
Hope this will help you.