GATE Mechanical Engineering (ME) 2017 Shift 1 Solved Paper

Moist air is treated as an ideal gas mixture of water vapour and dry air (molecular weight of air = 28. 84 and molecular weight of water = 18). At a location, the total pressure is 100 KPa, the temperature is 30°C and the relative humidity is 55%. Given that the saturation pressure of water at 30°C is 4246 Pa, the mass of water vapour per kg of dry air is ________ grams.