Chemical Thermodynamics Question 297

Question: On combustion, carbon forms two oxides CO and $ CO_2 $ , Heat of formation of $ CO_2 $ gas is 94.3 kcal and that of CO is 26.0 kcal. Heat of combustion of carbon is [JIPMER 2002]

Options:

A) 26.0 kcal

B) - 94.3 kcal

C) 68.3 kcal

D) - 120.3 kcal

Show Answer

Answer:

Correct Answer: B

Solution:

$ C+O_2\to CO_2,,\Delta H=-,94.3 $ This is also heat of formation of $ CO_2 $

$ C+\frac{1}{2}O_2\to CO,,\Delta H=-26.0 $ .



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