The temperature of 54 g of water is raised from $15^{\circ} \mathrm{C}$ to $75^{\circ} \mathrm{C}$ at constant pressure. The change in the enthalpy of the system (given that $\mathrm{C}_{\mathrm{p} . \mathrm{m}}$ of water $=75 \mathrm{JK}^{-1} \mathrm{mol}^{-1}$ ) is:
(a)4.5 kJ
(b)13.5 kJ
(c)9.0 kJ
(d)18.0 kJ
Answer
SELF-PRACTICE — the source book printed no answer.
Nothing is invented here, so this question has no answer on record.