Homework Help: Chemistry

Posted by Mewtwo on Saturday, September 30, 2006 at 2:51pm.

A spherical glass container of unknown volume contains helium gas at 25C and 1.960 atm. When a portion of the helium is withdrawn and adjusted to 1.00 atm at 25C, it is found to have a volume of 1.75 cm^3. The fas remaining in the first container shows a pressure of 1.710 atm. Calculate the volume of the spherical container.

Use PV = nRT to calculate n for the gas removed.
Then substitute this n in PV = nRT for the shperical container using P = 1.960 - 1.710 and solve for V.
Post your work if you get stuck.

1 atm X 1.75 cm^3 = n X(.08206)X 298.15K

n = 0.0715?
For the container.

(1.960 - 1.710 atm) X Volume = 0.0715 X (0.08206) X 298.15K.

Volume = 0.1429 cm^3?

That small?

Chemistry - dmoney, Friday, October 16, 2009 at 4:19pm
the stepsare correct but the arthimetic is wrong somewhere in between. You should get 7 ml
Chemistry - CfCaliforniumChick, Tuesday, October 27, 2009 at 9:58pm
agree with dmoney, the n value(moles) does not equal 0.0715, its 7.156 ^-3 which would make the answer 6.9938... or 7mL. Do not convert from mL to L in between, either do it at the beginning or the end.

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