Posted by **billystar** on Wednesday, April 23, 2008 at 11:29pm.

1. the molar mass of helium is 4.00 g/mol.

calculate the volume of 1 mol of helium at STP (T = 273, P = 1 atm)

what is the density of helium at STP?

2. the density of an ideal gas is 1.35 kg/m^3. if the temperature is Kelvin and the pressure are both doubled, find the new density of the gas.

- HELLO I NEED HELP AND NOBODY EVER HELPS ME. -
**Anonymous**, Thursday, April 24, 2008 at 12:20am
well nobody is gonna help you with that attitude :-(

- HELLO I NEED HELP AND NOBODY EVER HELPS ME. -
**Anonymous**, Thursday, April 24, 2008 at 1:04am
1)

V = nRT/P

= (1 x 8.314 x 273/101.23)

= 22.4 L

so the density is 4g/22.4L

2) assuming the volume is held constant, the density would be the same.

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