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Dry air (0% humidity) is approximately 78% N2, 21% O2, and 1% Ar by moles. Calculate the molar mass and density of dry air at 0 °C and 1.0 atm. Assume ideal behavior and use two significant figures in your answers.

A. molar mass=

B. density=

Typical outdoor air also has water vapor, H2O(g), mixed in with the other gases. Consider the molar mass and density of humid air compared to dry air.

A.The molar mass of humid air is

B. The density of humid air is

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