| The heat evolved in the combustion of benzene is given by |
| \[{{C}_{6}}{{H}_{6}}+7\frac{1}{2}{{O}_{2}}\to 6C{{O}_{2}}(g)+3{{H}_{2}}O(l);\,\Delta H=-3264.6\,kJ\] |
| Which of the following quantities of heat energy will be evolved when \[39\,g\,{{C}_{6}}{{H}_{6}}\] are burnt |
A) 816.15 kJ
B) 1632.3 kJ
C) 6528.2 kJ
D) 2448.45 kJ
Correct Answer: B
Solution :
| [b] 78g of benzene on combustion produces |
| heat = - 3264.6 kJ |
| \[\therefore 39g\] will produce \[=\frac{-3264.6}{2}=-1632.3\,kJ\]. |
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