How Many Moles of Gas Are in the Bicycle Tire?

[ttiger2k7]

Homework Statement

The air in a bicycle tire is bubbled through water and collected at 25 ^\circ {\rm C}. If the total volume of gas collected is 5.25 L at a temperature of 25 ^\circ {\rm C} and a pressure of 734 torr, how many moles of gas was in the bicycle tire?

Homework Equations

PV = nRT
n=\frac{PV}{RT}

R = .08206

The Attempt at a Solution

1. Convert 734 torr to atm

734/760 = .966 atm

2. Convert 25 ^\circ {\rm C} to K = 298.15 K

3. Plug those all in:

n=\frac{(.966 atn)(5.25 L)}{(.08206)(298.15 K)}

I got n=.207 moles, but the online assignment says I got it wrong.

 

[Borek]

0.207 is a correct number of TOTAL moles. Part of this total is water vapour.