A stream of air at $25C$ and $10\%$ relative saturation is humidified. It first flows through a heat exchanger, and then into a spray chamber operating under adiabatic conditions, from which it exits at $30C$ and $35\%$ relative humidity. If the volumetric flowrate of humid air exiting the spray chamber is to be $40\frac{m^3}{m}in,$ determine

a$.$ The temperature exiting the heat exchanger $48C$

b$.$ The heat requirement of the heat exchanger $1030k\frac{J}{m}in$

c$.$ The rate of water vaporization in the spray chamber $0\mathrm{.}33k\frac{g}{m}in$

I have the answer, i just need to understand how to get there!