$\mathrm{C}_{(s)}+2 \mathrm{H}_{2(g)} \rightarrow \mathrm{CH}_{4(g)} ; \Delta H=-74.8 \mathrm{~kJ} \

Question

$\mathrm{C}_{(s)}+2 \mathrm{H}_{2(g)} \rightarrow \mathrm{CH}_{4(g)} ; \Delta H=-74.8 \mathrm{~kJ} \mathrm{~mol}^{-1}$ 
Which of the following diagrams gives an accurate representation of the above reaction? [ $R \rightarrow$ reactants, $P \rightarrow$ products]

Professor PC Thomas Classes · Answer

(c) : $\mathrm{C}_{(s)}+2 \mathrm{H}_{2(\mathrm{~g})} \rightarrow \mathrm{CH}_{4(\mathrm{~g})} ; \Delta H=-74.8 \mathrm{~kJ} \mathrm{~mol}^{-1}$ 
For exothermic reaction, products have lesser energy than reactants.