Chemical Thermodynamics Question 439

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

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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