Physics 9702 · AS & A Level · The first law of thermodynamics
The first law of thermodynamics — practice question
A fixed mass of ideal gas starts off at a temperature of $17^\circ\text{C}$. It occupies a volume of $0.24\,\text{m}^3$ and has a pressure of $1.2 \times 10^5\,\text{Pa}$.
(a(i))[2]
State what the term ideal gas means.
(a(ii))[2]
Calculate the amount $n$ of gas.
(b(i))[2]
Show that the size of the work done in the change $AB$ is $19.2\,\text{kJ}$.
(b(ii))[5]
Complete Table 3.1 so that the work done on the gas, the thermal energy transferred to the gas and the rise in internal energy of the gas are shown for each of the changes $AB$, $BC$ and $CA$.
Worked solution & mark scheme
This 11-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A gas which follows $pV \propto T$” …