The volume of a car tire is 18 L of air. If the air is at STP, what is the

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I don't get this

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mass of air in the tire? The volume of a car tire is 18 L of air. If the air is at STP, what is the mass of air in the tire? (Air is about 21% oxygen gas and 79% nitrogen gas, these are diatomic molecules.)
 
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