One-half kmol of carbon monoxide (co) in a piston- cylinder assembly undergoes a process from p1 = 150 kpa, t1 = 300 k to p2 = 500 kpa, t2 = 420 k. for the process, w = -300 kj. employing the ideal gas model, determine: (a) the heat transfer, in kl. (b) the change in entropy, in kj/k.

Water at the rate of 1 kg/s is forced through a tube with a 2.5 cm inner diameter. the inlet water temperature is 15°c, and the outlet water temperature is 50°c. the tube wall temperature is 14°c higher than the local water temperature all along the length of the tube. what is the length of the tube?