Posted by Darryl on .
Calculate the weight of ethane, C2H6 (MWT = 30g/mole), required to produce a pressure of 1520 mm at 20 degrees C when contained in a 9.00 liter vessel. How many moles of ethane is it?

Chemistry 
DrBob222,
Use PV = nRT and solve for n = number of moles.
Then moles = grams/molar mass. Solve for grams. 
Chemistry 
Darryl,
Thank You...I got 22.5g and .75 moles...Is this correct???

Chemistry 
DrBob222,
22.46 which rounds to 22.5 to 3 s.f. For n I obtained 0.7486 which rounds to 0.749 moles. I used 2.00 for P, 9.00 for V. 0.08206 for R and 293 for T.