# Chemistry 105

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The air in a bicycle tire is bubbled through water and collected at 25 C.
If the total volume of gas collected is 5.65 L at a temperature of 25 C and a pressure of 729 torr, how many moles of gas was in the bicycle tire?

• Chemistry 105 -

I don't know how advanced the class is but the simple way is to use
PV = nRT.
However, the air will collect moisture as it is bubbled through water so the pressure you use is not 729 torr (don't forget it must be changed to atmospheres) but 729 torr - vapor pressure H2O at 25 C.
Post your work if you get stuck.

• Chemistry 105 -

(729-Pw) =?

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