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## Homework Statement

Estimate the mass of water vapor that is contained in [itex]1 m^3[/itex] of saturated air at a temperature of plus 20 degrees Celsius

**2. The attempt at a solution**

I looked up the saturation pressure for water vapor at the given temperature. Can I just use the ideal gas-law for the mass? i.e. is the solution as simple as

[tex]m_{H_2O} = \frac{P_{sat, H_2O}}{R_{H_2O}T}[/tex]

or do I have to make another approach?