Chemical Thermodynamics Question 297

Question: On combustion, carbon forms two oxides CO and CO2 , Heat of formation of CO2 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+O2CO2,,ΔH=,94.3 This is also heat of formation of CO2

C+12O2CO,,ΔH=26.0 .



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