Chemistry-(general)
NEET Chemistry (general) MCQ Question
Type: MCQ-numerical-Medium-Class 11
For the reaction C(graphite) + O2(g) → CO2(g), if the ∆rH values of two intermediate reactions leading to CO2(g) are -393.5 kJ/mol and 283.0 kJ/mol, what is the enthalpy change for the overall reaction?
A
-110.5 kJ/mol
B
-676.5 kJ/mol
C
110.5 kJ/mol
D
676.5 kJ/mol
Correct Answer
Option A
Detailed Explanation
According to the principle of Hess's Law, the enthalpy change for the overall reaction is the sum of the enthalpy changes for the individual steps: -393.5 + 283.0 = -110.5 kJ/mol.
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