Tuesday, June 28, 2011

PV=nrt

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.




Now,

1mole of nitrogen gas(assumption made in question that whole air is nitrogen) contains 28 grams of nitrogen.

so, n moles of nitrogen gas contains 28 * n g of nitrogen.

you know the value of n.

Multiply and find.

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