Solid ammonium nitrate,

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

Problem

\text{NH}_4\text{NO}_3

, dissolves in water with an enthalpy change of

+25.7\,\text{kJ}

per mole of

\text{NH}_4\text{NO}_3

. What mass of the salt must dissolve to absorb

1.13\times10^{2}\,\text{kJ}

of thermal energy from the surroundings? (a)

1.77\times10^{2}\,\text{g}

(b)

4.40\times10^{0}\,\text{g}

(c)

3.52\times10^{2}\,\text{g}

(d)

7.04\times10^{2}\,\text{g}