The pressure on 40ml of a gas is increased from 760mm to 800mm. find the new volumes at the same temperature.

The new volume is 38 ml.

Explanation:

At NTP,

P1 = 760 mm,

P2 = 800 mm,

V1 = 40 ml

Boyle's law states that when a gas is held at a constant temperature and mass in a closed container, the volume and pressure vary inversely.

By applying Boyle's law,

P1 V 1 = P2 V2

where P1, P2 represents the pressure of a gas,

V1, V2 represents the volume of a gas.

P1 V 1 = P2 V2

760*40 = 800*V 2

V 2 = (760*40) / 800

V2 = 38 mL.