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 $ .
