(a(i))[1]
State the meaning of the symbol $n$.
(a(ii))[1]
State the meaning of the symbol $T$.
(b)[3]
An ideal gas is contained in a vessel with volume $2.4 \times 10^{3}\ \text{cm}^{3}$ and pressure $4.9 \times 10^{5}\ \text{Pa}$. The gas temperature is $100^{\circ}\text{C}$. Show that the number of molecules in the vessel is $2.3 \times 10^{23}$.
(c)[3]
Use the data from (b) to estimate the average separation between molecules in the gas.