Two aqueous solutions

CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics

Problem

Two

100\,\text{cm}^3

aqueous solutions, one containing

0.010\,\text{mol}

NaOH and the other containing

0.010\,\text{mol}

HCl, are at the same temperature. When the two solutions are mixed, the temperature rises by

y^\circ\text{C}

. Assume that the density of the final solution is

1.00\,\text{g cm}^{-3}

. The specific heat capacity of water is

4.18\,\text{J g}^{-1}\text{ K}^{-1}

. What is the enthalpy change of neutralization in

\text{kJ mol}^{-1}

? (1)

\frac{200\times4.18\times y}{1000\times0.020}

(2)

\frac{200\times4.18\times y}{1000\times0.010}

(3)

\frac{100\times4.18\times y}{1000\times0.010}

(4)

\frac{200\times4.18\times(y+273)}{1000\times0.010}