The Freezing Point of Ammonia (NH₃,17

question 182

Multiple Choice

The freezing point of ammonia (NH₃,17.04 g/mol) is -77.73°C.In an experiment,367.2 grams of solid NH₃ at -77.73°C is used to cool 250.0 grams of liquid NH₃ from 25.00°C to the freezing point.Assume that the specific heat capacity of liquid NH₃ is 4.742 J/(g . °C) .What is the enthalpy of fusion of ammonia?

• A)"2.894 kJ/mol"
• B)"-2.894 kJ/mol"
• C)"5.652 kJ/mol"
• D)"-5.652 kJ/mol"
• E)"0.3315 kJ/mol"

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