chem
posted by nikki .
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 735 torr, how many moles of gas was in the bicycle tire?

PV=nRT
solve for n. Use temp in kelvins.
R depends on units, I would shift to kpa, so make certain you use the right R. 
0.21