A) - 121 kJ/mol
B) + 121 kJ/mol
C) - 242 kJ/mol
D) + 242 kJ/mol
Correct Answer: A
Solution :
\[{{H}_{2}}+\frac{1}{2}{{O}_{2}}\xrightarrow{{}}{{H}_{2}}O\] \[\Delta H=-\,241\,kJ\]?(i) \[{{C}_{6}}{{H}_{10}}+\frac{17}{2}{{O}_{2}}\xrightarrow{{}}6C{{O}_{2}}+5{{H}_{2}}O\] \[\Delta H=-\,3800\,kJ\]?(ii) \[{{C}_{6}}{{H}_{12}}+9{{O}_{2}}\xrightarrow{{}}6C{{O}_{2}}+6{{H}_{2}}O\] \[\Delta H=-\,3920\,kJ\]?(iii) Hydrogenation of cyclohexene- \[{{C}_{6}}{{H}_{10}}+{{H}_{2}}\xrightarrow{{}}{{C}_{6}}{{H}_{12}}\] Eq (i) + Eq (ii) - Eq (iii) \[\Delta H=-\,241-3800-\left( -\,3920 \right)\] \[=-\,4041+3920\] \[=-121\,kJ\]
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