Chemistry!!!!!!!!!!!?

Assuming that air is composed entirely of nitrogen gas (only about 78% in reality; most of the rest is oxygen), what is the mass of air in grams in a spherical balloon that has a radius of 5 cm? The pressure is 1.00 atm and the temperature is 300K. The volume of a sphere is 4*π*r3/3. Report your answer to three... show more Assuming that air is composed entirely of nitrogen gas (only about 78% in reality; most of the rest is oxygen), what is the mass of air in grams in a spherical balloon that has a radius of 5 cm? The pressure is 1.00 atm and the temperature is 300K. The volume of a sphere is 4*π*r3/3. Report your answer to three significant figures.
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