Chemistry-Enthalpy
NEET Chemistry Enthalpy MCQ Question
Type: MCQ-numerical-Medium-Class 11
Calculate the enthalpy change (∆rH) for the reaction: C(g) + 4H(g) → CH4(g). Given that the mean bond enthalpy for C–H bond in CH4 is 416 kJ/mol.
A
-1665 kJ/mol
B
1665 kJ/mol
C
-416 kJ/mol
D
416 kJ/mol
Correct Answer
Option A
Detailed Explanation
The mean bond enthalpy for breaking CH4 into C(g) and 4H(g) is given as 1665 kJ/mol. Therefore, forming CH4 from C(g) and 4H(g) releases the same amount of energy, so ∆rH is -1665 kJ/mol.
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