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A level: Kinetic Theory Questions

Q3.

(a) State two quantities which increase when the temperature of a given mass of gas is increased at constant volume.

(2 marks)

(b) A car tyre of volume 1.0 × 10–2 m3 contains air at a pressure of 300 kPa and a temperature of 290 K. The mass of one mole of air is 2.9 × 10–2 kg. Assuming that the air behaves as an ideal gas, calculate

(i) n, the amount, in mol, of air,

(ii) the mass of the air,

(iii) the density of the air.

(5 marks)

(c) Air contains oxygen and nitrogen molecules. State, with a reason, whether the following are the same for oxygen and nitrogen molecules in air at a given temperature.

(i) The average kinetic energy per molecule

(ii) The r.m.s. speed

(4 marks)

(Total 11 marks)