The total volume of a new house is 705 m3. Before the heat is turned on, the air temperature inside is 15C, and the relative humidity is 44 percent.

The total volume of a new house is 705 m3. Before the heat is turned on, the air temperature inside is 15°C, and the relative humidity is 44 percent. After the air is warmed to 20°C, how much water vapor must be added to the air to make the relative humidity 44 percent?