In a reciprocating cylinder with a volume of 0.5 m3 at the first moment, 0.1 MPa at 30 oC and 80% relative humidity air water vapor There is a mix. The mixture is first cooled at constant pressure and then heated after the condensed water is removed. and as a result, when its temperature is 20 oC, its relative humidity becomes 70%. (a) Find the initial humidity, air and water vapours. (b) Find the minimum temperature at which condensation occurs. c) Calculate the amount of heat absorbed and given during cooling and subsequent heating