The combustion of hydrogen gas to form liquid water has (per mole of consumed)

CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics

Problem

The combustion of hydrogen gas to form liquid water has

\Delta H = -286\,\text{kJ mol}^{-1}

(per mole of

\text{H}_2

consumed). Calculate the minimum mass of

\text{H}_2

(in grams) that must be burned to release

1.72\times10^{3}\,\text{kJ}

of heat.