Chem
posted by Lisa .
A 11.9g sample of a gas has a volume of 5.25L at 30 degrees celsius and 762mm Hg.
If 2.4g of the same gas is added to this constant 5.25L volume and the temperature raised to 64 degrees celsius, what is the new gas pressure?

Use PV = nRT for the 11.9 g sample and solve for n. Then moles = g/molar mass and solve for molar mass.
Then convert 2.4 g of the same gas to moles, add to the initial n in the 11.0 g sample, and use PV = nRT to calculate P.