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    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? 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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    Could someone help me answer these Chemistry questions? part 2?

    ____22.The first figure in a properly written chemical symbol always is ____. - capitalized ____23.Which of the following is used for chemical symbols today? - one or two letter symbols ____24.Which of the following represents a compound? - H2O, C12H22O11 ____25.The chemical formula...
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