Heat of formation of \( \mathrm{CH}_{4} \) are: If given heat: \[ \begin{array}{lr} \mathrm{C}(\...
0Heat of formation of \( \mathrm{CH}_{4} \) are:
If given heat:
\[
\begin{array}{lr}
\mathrm{C}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{~g}) \longrightarrow \mathrm{CO}_{2}(\mathrm{~g}) & ; \Delta \mathrm{H}=-394 \mathrm{~kJ} \\
2 \mathrm{H}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{H}_{2} \mathrm{O}(\ell) & ; \Delta \mathrm{H}=-568 \mathrm{~kJ} \\
-\mathrm{CH}_{4}(\mathrm{~g})+2 \mathrm{O}_{2}(\mathrm{~g}) \longrightarrow \mathrm{CO}_{2}(\mathrm{~g})+2 \mathrm{H}_{2} \mathrm{O}(\ell) \\
& ; \Delta \mathrm{H}=-892 \mathrm{~kJ}
\end{array}
\]
(a) \( -70 \mathrm{~kJ} \)
(b) \( -16.7 \mathrm{kcal} \)
(c) \( -244 \mathrm{~kJ} \)
(d) \( -50 \mathrm{kcal} \)
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