Published by:
CGP EDU Academic Team
Published on: August 14, 2026
The standard molar heat of formation of ethane, CO 2 and water are respectively -21.1, -94.1 and - 68.3 kcal. The standard molar heat of combustion of ethane will be:
Text Solution
Verified by ExpertsThe correct answer is:
A
-372 kcal/mol
Given, 2C + 3H 2 
C 2 H 6 ; 
H = - 21.1
C + O 2 
CO 2 ; 
H = -94.1
H 2 + 
O 2 
H 2 O; 
H = -68.3
Eqs. 2 x (ii) + 3 x (iii) - (i)
C 2 H 6 + 
O 2 
2CO 2 + 3H 2 0
x = 2 (-94.1)+3 (-68.3) - (-21.1)
= -372 kcal/mol
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
Combustion of Hydrogen in a fuel cell at 300 K is represented as 2H 2 (g) + O 2 (g) 2H 2 O (g). If…
For a process to occur spontaneously, the system free energy or chemical potential of the system :
A gas occupies 2 litres at STP. It is provided 58.63 joule heat so that its volume becomes 2.5 litr…
Calculate for chloride ion from the following data:
of
The relation between pressure P and volume V is given by = constant. If the percentage decrease in…
Calculate the heat produced (in kJ ) when 224gm of CaO is completely converted to CaCO 3 by reactio…