Homework Help: Chemistry

Posted by Darryl on Tuesday, December 14, 2010 at 5:35pm.

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, Tuesday, December 14, 2010 at 6:08pm
Use PV = nRT and solve for n = number of moles.
Then moles = grams/molar mass. Solve for grams.
Chemistry - Darryl, Tuesday, December 14, 2010 at 6:31pm
Thank You...I got 22.5g and .75 moles...Is this correct???
Chemistry - DrBob222, Tuesday, December 14, 2010 at 7:58pm
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.

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