Interpretation:
The amount of heat released when 275g of ammonia gas condenses to a liquid at its boiling point is to be calculated.
Concept introduction:
Heat of vaporization: The amount of heat needed to turn a gram of liquid into vapor.

Answer to Problem 24PP
The heat of vaporisation,
Molar mass of ammonia
Explanation of Solution
The following steps are needed to calculate the heat released:
- Calculate the molar mass of ammonia
- Calculate the number of moles contained in 275g of ammonia.
- Calculate the heat releasedwhen ammonia condenses using the formula,
The heat required to melt 275g of ammonia is 376.9kJ.
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