Chemistry-Enthalpy
NEET Chemistry Enthalpy MCQ Question
Type: MCQ-numerical-Hard-Class 11
Calculate the enthalpy change for the reaction: 2H2(g) + O2(g) → 2H2O(l) using the given standard enthalpies of formation: ∆fH for H2O(l) = –285.8 kJ/mol.
A
-571.6 kJ
B
-285.8 kJ
C
-143.0 kJ
D
+571.6 kJ
Correct Answer
Option A
Detailed Explanation
The enthalpy change for the reaction is calculated by multiplying the enthalpy of formation of water by 2 because 2 moles of water are formed: 2 × (–285.8 kJ/mol) = –571.6 kJ.
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