Question

2. An air conditioner using Freon as a gas removes heat of 1.5 k.Cal.s–1 from a large room. The power required to run it is 2 kW. If the typical value of q2/w is 1/10 that of a Carnot refrigerator and the temperature outside is 313 K. [Cv = 0.064 J K-1 mol-1]

(a) Find the work done, w of the system.

(b) What is the temperature inside the room in degree Celsius?

(c) Calculate internal energy, ΔU for each step and total ΔU in the system.

Answer 1

a) 783kW

b)32°C

c) Internal Energy =218Jk-1 ,$\Delta U$ Inside =485kJ,Outside =$-$ 179kJ,Total $\Delta U=306kJ$