Chemistry-(general)
NEET Chemistry (general) MCQ Question
Type: MCQ-numerical-Hard-Class 11
Calculate the total enthalpy change for the formation of NaCl(s) from its gaseous ions given that the enthalpy of lattice formation is -788 kJ/mol and the enthalpy of formation of gaseous ions is 147.1 kJ/mol.
A
-635.9 kJ/mol
B
-640.9 kJ/mol
C
-641.9 kJ/mol
D
-645.9 kJ/mol
Correct Answer
Option A
Detailed Explanation
The total enthalpy change is the sum of the enthalpy of formation of gaseous ions (147.1 kJ/mol) and the lattice enthalpy (-788 kJ/mol), which equals -635.9 kJ/mol.
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