Physics-(general)
NEET Physics (general) MCQ Question
Type: MCQ-numerical-Hard-Class 11
Calculate the standard enthalpy change for the reaction: 2C (graphite, s) + 3H2 (g) + 1/2O2 (g) → C2H5OH(l) given the following reactions: H2 (g) + 1/2O2 (g) → H2O(l); ∆fH° = -285.8 kJ mol–1, C (graphite, s) + 2H2 (g) → CH4 (g); ∆fH° = -74.81 kJ mol–1.
A
-277.7 kJ mol–1
B
-110.5 kJ mol–1
C
-1367 kJ mol–1
D
-393.5 kJ mol–1
Correct Answer
Option A
Detailed Explanation
The enthalpy change of the reaction is directly given in the NCERT context as ∆fH° = -277.7 kJ mol–1 for the formation of ethanol from its elements.
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