A) ? 85 kcal
B) ? 111 kcal
C) ? 17 kcal
D) ? 170 kcal
Correct Answer: C
Solution :
\[{{C}_{(s)}}+2{{H}_{2}}_{(g)}\to C{{H}_{4(g)}}\] ?..(i) \[{{C}_{(s)}}+{{O}_{2(g)}}\to C{{O}_{2(g)}}\,\,\,\Delta H=-94\,kcal\,mo{{l}^{-1}}\] ?..(ii) \[{{H}_{2(g)}}+\frac{1}{2}{{O}_{2(g)}}\to {{H}_{2}}{{O}_{(l)}}\,\,\,\Delta H=-68\,kcal\,mo{{l}^{-1}}\]? (iii) \[C{{H}_{4}}+3{{/}_{2}}{{O}_{2}}\to C{{O}_{2}}+2{{H}_{2}}O\] \[\Delta H=-213\,kcal\,mo{{l}^{-1}}\] ? (iv) to obtain equation (i) operate-(ii) + 2 × (iii) ? (iv).You need to login to perform this action.
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