Determine the mass flow rate of the dry air through the system

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A 4 kW electric heater followed by a steam humidifier. Outside air at 12 ⁰C and 20 % relative humidity is fed into the system and leaves the heater at 20 ⁰C. The outlet condition of the humidifier is 25 ⁰C and 50 % relative humidity. Determine a) the mass flow rate of the dry air through the system b) the mass flow of the steam required for the humidifier c) the volumetric flow rate of air at the exit of the system