Dissolving solid in water has

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

Problem

Dissolving solid

\text{KNO}_{3}

in water has

\Delta H_{\text{rxn}}=+35.7\,\text{kJ}\,\text{mol}^{-1}

. How much heat in joules is absorbed when

0.75\,\text{mol}

\text{KNO}_{3}

dissolves at constant pressure? (a)

3.57\times10^{4}\,\text{J}

(b)

4.76\times10^{4}\,\text{J}

(c)

2.68\times10^{4}\,\text{J}

(d)

2.68\times10^{5}\,\text{J}