Using the standard enthalpies of formation below

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

Problem

Using the standard enthalpies of formation below, calculate

\Delta H^\circ

for the reaction

2\,\text{CO}(g)+\text{O}_2(g)\longrightarrow 2\,\text{CO}_2(g).

\u2022

\Delta H_f^\circ[\text{CO}(g)]= -110.5\,\text{kJ}\,\text{mol}^{-1}

\u2022

\Delta H_f^\circ[\text{CO}_2(g)]= -393.5\,\text{kJ}\,\text{mol}^{-1}

(a)

-2.83\times10^{2}\,\text{kJ}

(b)

-7.87\times10^{2}\,\text{kJ}

(c)

-5.66\times10^{2}\,\text{kJ}

(d)

+5.66\times10^{2}\,\text{kJ}