A) 47.3 kcal
B) 20.0 kcal
C) 45.9 kcal
D) ? 47.3 kcal
Correct Answer: B
Solution :
\[C+{{O}_{2\,}}\to \,\,C{{O}_{2}}+94.2\,\,Kcal.\] ?..(i) \[{{H}_{2}}+\frac{1}{2}{{O}_{2}}\,\,\to \,{{H}_{2}}O+68.3\,\,Kcal.\] ?.(ii) On multiplication of eq. (ii) by 2 and than adding in eq. (i) \[C+2{{H}_{2}}+2{{O}_{2}}\to C{{O}_{2}}+2{{H}_{2}}O+230.8\,\,Kcal\] ?(iii) On subtracting eq. (iii) by following eq. \[C{{H}_{4}}+2{{O}_{2}}\to C{{O}_{2}}+2{{H}_{2}}O+210.8\,\,Kcal.\] we get, \[C+2{{H}_{2}}\to C{{H}_{4}}\,\,\Delta H=20\,\,Kcal.\]
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