Q. The bond dissociation energies of X, Y, and XY are in the ratio of 1: 0.5 : 1. ∆H for the formation of XY is -200 kJ mol-1. The bond dissociation energy of X, will be. (1) 200 kJ mol-1
(2) 100 kJ mol-1
(3) 400 kJ mol-1
(4) 800 kJ mol-1

Arefrigerator uses r-134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle except for the compression process. the refrigerant enters the evaporator at 120 kpa with a quality of 34 percent and leaves the compressor at 70°c. if the compressor consumes 450 w of power, determine (a) the mass flow rate of the refrigerant, (b) the condenser pressure, and (c) the cop of the refrigerator. (0.00644 kg/s, 800 kpa, 2.03)