A fixed mass of gas has a volume of 25 cm³. The pressure of the gas is 100 kPa. The volume of the gas is slowly decreased by 15 cm³ at constant temperature.
What is the change in pressure of the gas?
A)67 kPa
B)150 kPa
C)170 kPa
D)250 kPa​

67 kPa

Explanation:

Given that,

Initial volume, V₁ = 25 cm³

Initial pressure, P₁ = 100 kPa

Final volume, V₂ = 15 cm³

We need to find the change in pressure of the gas. The relation between the volume and pressure of a gas is given by :

or

= 167 kPa

The change in pressure,

= P₂ - P₁

= 167 kPa - 100 kPa

= 67 kPa

Hence, the correct option is (a).