Question

Gas of mass 0.23 g is trapped in a cylinder by a piston. The gas is at atmospheric pressure which is 1.0 × 105Pa. Fig. shows the piston held in position by a catch. The volume of the trapped gas is 1.9 × 10–4m3.

An electrical heater is used to increase the temperature of the trapped gas by 550 °C.

(a) The specific heat capacity of the gas is 0.72 J / (g °C).

(i) Calculate the energy required to increase the temperature of the trapped gas by 550 °C.

Answer 1

$$\Delta Q=mc\Delta T\\\Delta Q=(0.72)(0.23)(550)=91\ J$$