A) \[3.264\text{ }kJ/mol\]
B) \[32.64\text{ }kJ/mol\]
C) \[326.4\text{ }kJ/mol\]
D) \[163.22\text{ }kJ/mol\]
Correct Answer: C
Solution :
\[\underset{(6\times 12+6\times 1=78)}{\mathop{{{C}_{6}}{{H}_{6}}(l)+\frac{15}{2}{{O}_{2}}(g)}}\,\to 3{{H}_{2}}O(l)+6C{{O}_{2}}(g)\] \[\because \] The energy evolved when 78 g. benzene is burnt \[=3264.4\text{ }kJ/mol\] \[\therefore \]The energy evolved when 7.8g benzene is burnt \[=\frac{3264.4\times 7.8}{78}=326.44kJ/mol\]
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