Homework Help: chem

Posted by mel on Saturday, November 17, 2007 at 10:00pm.

A spherical glass container of unknown volume contains helium gas at 25°C and 1.950 atm. When a portion of the helium is withdrawn and adjusted to 1.00 atm at 23°C, it is found to have a volume of 1.55 cm3. The gas remaining in the first container shows a pressure of 1.710 atm. Calculate the volume of the spherical container.

in mL

chem - DrBob222, Saturday, November 17, 2007 at 11:38pm
Use PV = nRT to calculate n for the 1.55 cc removed.
Subtract P in the sphere of 1.950 - that after 1.55 cc were removed (1.71) and use PV =nRT to calculate volume.
Post your work if you get stuck.
- chem - mel, Sunday, November 18, 2007 at 11:50am
  am i using the 1 atm for pressure or teh 1.950 atm for the first part?
- chem - mel, Sunday, November 18, 2007 at 11:52am
  for the first n i got .0638129 rounded... is that right?
chem - mel, Sunday, November 18, 2007 at 11:48am
do i need to change the cc into ml?
for the equation?
chem - DrBob222, Sunday, November 18, 2007 at 1:09pm
The 638 part is right but the exponent is wrong. I suspect you used mL and not liters. Using PV = nRT,
P = 1 atm (that't the pressure of the 1.55 cc sample); V = 0.00155 Liters etc etc. I have 6.38 x 10^-5 mols for n. Check my work.

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