Homework Help: Chemistry

Posted by Laurie on Sunday, October 2, 2011 at 12:10am.

A 23 L flask at 254 K and 19 Torr contains nitrogen. What mass of nitrogen is present? Answer in units of g.

Chemistry - DrBob222, Sunday, October 2, 2011 at 12:12am
Use PV = nRT and solve for n. Then
n = grams/molar mass. Solve for grams.
Chemistry - Laurie, Sunday, October 2, 2011 at 12:21am
.2757g
Chemistry - DrBob222, Sunday, October 2, 2011 at 12:33am
I don't get that.
PV = nRT so
n = PV/RT
P = 19/760
V = 23
R = 0.08206
T = 254
and I find about 0.027 but you need to do it more accurately.
Then n = grams/molar mass
so grams = n from above x about 28 = about 0.8 gram.

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