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Liquid Ammonia (Boiling Point = -33 °\degree C) Can Be Used as a Refrigerant and Heat Transfer

Question 1

Multiple Choice

Liquid ammonia (boiling point = -33.4 °\degree C) can be used as a refrigerant and heat transfer fluid. How much energy is needed to heat 25.0 g of NH3(l) from -65.0 °\degree C to -12.0 °\degree C?
Specific heat capacity, NH3(l) : 4.7 J/(g ? K)
Specific heat capacity, NH3(g) : 2.2 J/(g ? K)
Heat of vaporization: 23.5 kJ/mol
Molar mass, ?: 17.0 g/mol


A) 5.5 kJ
B) 6.3 kJ
C) 39 kJ
D) 340 kJ
E) 590 kJ

Correct Answer:

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