Interpretation:
The molar heat of condensation of ammonia for a given the molar heat of vaporization is to be determined.
Concept introduction:
Molar heat of condensation: The heat evolved when 1mol of vapor condenses.
Molar heat of vaporization: The heat evolved when 1mol of liquid vaporizes.

Answer to Problem 30SSC
The molar heat of condensation of a given substance is the exact opposite to molar heat of vaporization.
Explanation of Solution
The molar heat of condensation of a given substance is the exact opposite to molar heat of vaporization. Since, the molar heat of vaporization is already given; the molar heat of condensation will have same magnitude as the molar heat of vaporization but with a negative sign.
The molar heat of condensation of ammonia is -23.3kJ/mol.
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