chem 121

How many air molecules are in a 15.0×12.0×10.0 ft room? Assume atmospheric pressure of 1.00 atm, a room temperature of 20.0 ∘C, and ideal behavior.

Volume conversion:There are 28.2 liters in one cubic foot.

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  1. just plug in your formula

    PV = nRT
    n = PV/RT

    n is the number of moles.
    Now multiply by A, Avogadro's constant to get the number of molecules.

    Or, since R = kA,

    n = PV/kAT so

    nA = PV/kT

    gives the number of molecules

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