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December 20, 2014

December 20, 2014

Posted by **Kim** on Wednesday, June 20, 2012 at 1:02pm.

- General Chemistry -
**DrBob222**, Wednesday, June 20, 2012 at 2:24pmThe easy way to explain but the long way to work it is the following:

Use PV = nRT. You know V = 2.00L, you can assume any value for T, you know n = 0.500(2.00 g/molar mass He). Solve for P.

Then for the 2.7O L volume, use PV = nRT, substitute P from the first calculation, T is the same as in the first, and solve for n. Multiply by molar mass to obtain grams and subtract from the original 2.00 to find how much additional He was added.

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