# HELLO I NEED HELP AND NOBODY EVER HELPS ME.

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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. -

• HELLO I NEED HELP AND NOBODY EVER HELPS ME. -

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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