Posted by **Peter** on Tuesday, March 9, 2010 at 9:09am.

A sample of gas of mass 2.929 g occupies a volume of 426 mL at 0degree Cel and 1.00 atm pressure. What is the molecular weight of the gas?

Thanks!

- Chem -
**DrBob222**, Tuesday, March 9, 2010 at 12:50pm
Use PV = nRT

Calcualte n

n= #moles = grams/molar mass

You know n and g, calculate molar mass

- Chem -
**Peter**, Tuesday, March 9, 2010 at 1:43pm
How do I know what N is??

- Chem -
**DrBob222**, Tuesday, March 9, 2010 at 3:45pm
n comes from the equation PV = nRT.

You have V, P, T, and you know R (0.08206) . n is the only unknown in that equation.

Don't forget to change T to Kelvin.

K = 273 + Celsius.

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