chem 1p1

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An automobile tire at 22oC with an internal volume of 20.0L is filled with air to a total pressure of 30. psi(pounds per square inch). [1 atm = 14.696 lb/in2].
What is the amount in moles of air in the tire?
If the air is mostly nitrogen, how many grams of it would be in the tire?
How many pounds of it would be in the tire?

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