Chemical Thermodynamics Question 244

Question: Standard molar enthalpy of formation of $ CO_2 $ is equal to [IIT JEE 1997; BHU 2001]

Options:

A) Zero

B) The standard molar enthalpy of combustion of gaseous carbon

C) The sum of standard molar enthalpies of formation of $ CO $ and $ O_2 $

D) The standard molar enthalpy of combustion of carbon (graphite)

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Answer:

Correct Answer: D

Solution:

Standard molar heat enthalpy $ (H^{o}) $ of a compound is equal to its standard heat of formation from most stable states of initial components.



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