(a)[2]
State the meaning of internal energy.
(b)[4]
Fig. 2.1 shows how the pressure $p$ of an ideal gas varies with volume $V$ as it goes through the cycle ABCA of changes. The gas has temperature $290\,\text{K}$ at A and $870\,\text{K}$ at B. Determine (i) the amount, in mol, of gas, and (ii) the temperature of the gas at C.
(b(i))[2]
Determine the amount of gas, in mol.
(b(ii))[2]
Determine the gas temperature at C.
(c)[2]
Explain why the change from C to A involves both external work and a change in internal energy.
(a(i))[2]
Determine the amount of gas, in mol.
(a(ii))[2]
Determine the gas temperature at C.