Homework Help: Chemistry (URGENT)

Posted by Ashley on Wednesday, December 15, 2010 at 9:58pm.

A gas mixture with a total pressure of 770 contains each of the following gases at the indicated partial pressures: CO2 , 249mmHg ; , Ar 114mmHg ; and , O2 174mmHg . The mixture also contains helium gas.

1. What is the partial pressure of the helium gas?

2. What mass of helium gas is present in a 11.2 L sample of this mixture at 281 K?

Chemistry (URGENT) - DrBob222, Wednesday, December 15, 2010 at 10:07pm
Ptotal = PCO2 + PAr + PO2 + PHe.
Only 1 unknown; i.e., PHe.

2. I would use PV = nRT, solve for n = number of moles He, then moles = grams/molar mass will solve for grams.
Post your work if you get stuck.

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