Homework Help: chm

Posted by sarah on Friday, October 10, 2008 at 6:40pm.

A cylinder with a movable piston contains 2.00 of helium,He, at room temperature. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added to the cylinder if the volume was changed from 2.00 L to 3.10 l ?

chm - Damon, Friday, October 10, 2008 at 6:48pm
Typo in the first line, I suppose you mean 2 grams of Helium
P1 V1 = n1 R T1
P1 V2 = n2 R T1
so
V1/V2 = n1/n2
2/3.1 = 2/x
x = 3.1
x-2 = amount added = 1.1
chm - sarah, Friday, October 10, 2008 at 6:56pm
yes thank you!!!!
chm - Corey, Saturday, October 17, 2009 at 8:25pm
That answer is not right.

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