(a(i))[2]
State what the term ideal gas means.
(a(ii))[1]
State the temperature of absolute zero, in degrees Celsius.
(b(i))[3]
An airtight vessel contains $0.0424\,\text{kg}$ of an ideal gas at $227\,^{\circ}\text{C}$. The gas pressure is $1.37 \times 10^5\,\text{Pa}$ and its volume is $0.640\,\text{m}^3$. Calculate the number of molecules of the gas in the vessel.
(b(ii))[1]
Calculate the mass of one molecule of the gas.
(b(iii))[3]
Calculate the root-mean-square (r.m.s.) speed $v$ of the molecules of the gas.
(c)[2]
As the gas in (b) is cooled slowly to absolute zero, sketch on Fig. 2.1 how the r.m.s. speed of the molecules varies with thermodynamic temperature $T$.