1.Determine the length of an interval of time such that the probability of at least one call in the interval is 0.90
2.Using Raoult's Law or Henry's Law, as appropriate, calculate the pressure and mole fractions in the vapor phase for a system containing a liquid that is 0.3% N2 and 99.7% water (by moles) in equilibrium with its vapor at 80°C.
3.Water is used in a heat exchange to cool 5 kg/s of air from 400 C to 200 C. Calculate (a) the minimum mass flux (kg/s) of the water and (b) the quantity of heat transferred (MJ) to the water each second. The water enters at 20 C and leave at 30 C.