Physics 9702 · AS & A Level · The first law of thermodynamics
The first law of thermodynamics — practice question
At the start, a fixed mass of an ideal gas is at $17\,^{\circ}\text{C}$. Its volume is $0.24\,\text{m}^3$ and its pressure is $1.2 \times 10^5\,\text{Pa}$.
(a(i))[2]
State the meaning of an ideal gas.
(a(ii))[2]
Calculate the amount of gas, $n$.
(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 it shows the work done on the gas, the thermal energy supplied to the gas and the increase in internal energy of the gas, 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 that follows $pV \propto T$” …