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

Use PV = nRT and solve for n. Then
n = grams/molar mass. Solve for grams. 
.2757g

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.