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March 4, 2015

March 4, 2015

Posted by **Anonymous** on Thursday, April 29, 2010 at 9:21am.

I got PO= 5.82, PHe=15.5 and Ptotal=21.4 but it says that PO and Ptotatl are wrong, can anyone help?

- Chemistry -
**drwls**, Thursday, April 29, 2010 at 10:43amYour bottle contains 1.57 moles of O2 and 8.35 moles of He, for a total of 9.92 moles. At STP, that gas would occupy 222 liters; at 22 C and 1 atm, it would occupy 240 liters. Since the vlume is 13.0 L, the pressure must be Ptotal = 240/13 = 18.8 atm

The partial pressure of O2 is 15.9% of the total pressure, or 2.98 atm

Your mistake may be in using 16 instead of 32 for the (molecular) weight of oxygen.

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