A) \[-\,372.69\]
B) \[-\,387.70\]
C) \[-\,370.89\]
D) \[-\,372.16\]
Correct Answer: B
Solution :
For the reaction, \[{{C}_{3}}{{H}_{7}}N{{O}_{2}}(s)+\frac{11}{2}{{O}_{2}}(g)\xrightarrow{{}}3C{{O}_{2}}(g)+\frac{1}{2}{{N}_{2}}(g)+\]\[\frac{7}{2}{{H}_{2}}O\,(g)\] |
\[\Delta {{H}_{comb}}=3\Delta {{H}_{f}}C{{O}_{2}}+0+\frac{7}{2}\Delta {{H}_{f}}({{H}_{2}}O)\]\[-\,\Delta {{H}_{f}}({{C}_{3}}{{H}_{7}}N{{O}_{2}})\,+\,0\] |
\[=3\,(-\,94.05)+\frac{7}{2}(-\,68.32)-(-\,133.57)\]\[=-\,387.70\,kcal/mol.\] |
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