The decomposition of dinitrogen tetroxide is represented by

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

Problem

\mathrm{N_2O_4}(g)\rightarrow2\,\mathrm{NO_2}(g)\qquad \Delta H=+57.2\ \text{kJ}

. How much heat, in kilojoules, is absorbed when

10.0\ \text{g}

\mathrm{N_2O_4}

decomposes under the same conditions? (Molar mass

\mathrm{N_2O_4}=92.0\ \text{g mol}^{-1}

) (a)

3.1\ \text{kJ}

(b)

-6.2\ \text{kJ}

(c)

6.2\ \text{kJ}

(d)

12.4\ \text{kJ}