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Posted on 2016-03-11 18:39:00 in Physics by ANAS

Two questions 

(1) What is the heat required to vaporize 68.1 g of liquid ammonia, NH3, at its boiling point? The ΔH° of vaporization of ammonia is 23.4 kJ/mol. Use a molar mass with at least as many significant figures as the data given. 

(2) A 21.6 g silver ring (cp = 234 J/kg·°C) is heated to a temperature of 73.8°C and then placed in a calorimeter containing 4.64 ✕ 10-2 kg of water at 24.0°C. The calorimeter is not perfectly insulated, however, and 0.168 J of energy is transferred to the surroundings before a final temperature is reached. What is the final temperature?

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