Chemical Thermodynamics Question 167

Question: The heat evolved in the combustion of benzene is given by $ C_6H_6+7\frac{1}{2}O_2\to 6CO_2(g)+3H_2O(l);,\Delta H=-3264.6,kJ $ Which of the following quantities of heat energy will be evolved when $ 39,g,C_6H_6 $ are burnt [NCERT 1978; MP PET 1990; JIPMER 2001]

Options:

A) 816.15 kJ

B) 1632.3 kJ

C) 6528.2 kJ

D) 2448.45 kJ

Show Answer

Answer:

Correct Answer: B

Solution:

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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