Homework Help: Chemistry

Posted by Lauren on Tuesday, October 23, 2007 at 12:17am.

In an experiment, you fill a heavy walled 5.00 L flask with methane gas, CH4. If the flask contains 7.13g of methane at 19 degrees C, what is the gas pressure.

Use the ideal gas law.

Can some one help me get started on this problem please

Chemistry - DrBob222, Tuesday, October 23, 2007 at 12:32am
PV = nRT
P is pressure in atmospheres and in this problem is the unknown.
V = volume in liters = 5.00 L.
n = mols = grams/molar mass = 7.13/molar mass CH4.
R = gas constant in L*atm/mol*K = 0.08205
T = temperature in Kelvin = 273 + C.
Solve for P
Chemistry - Lauren, Tuesday, October 23, 2007 at 12:44am
P(5.00L)= .446 mol(.0821)(292K)

It would look like this right then do I just multiply it all together and divide by the 5.00 L
Chemistry - DrBob222, Tuesday, October 23, 2007 at 11:48am
Yes, I found 2.13 but check my arithmetic.

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