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 $ .
