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August 21, 2014

Homework Help: AP Chemistry

Posted by Paxton on Wednesday, April 6, 2011 at 12:49pm.

Three gases, xenon, helium, and hydrogen are confined in a 10.0 L vessel at a pressure of 7.0 atm. Intially the vessel contains 3.0 moles of xenon, 2.0 moles of helium, and 2.0 moles of hydrogen. What would the partial pressure of helium be if 5.0 moles of hydrogen are added to the vessel? Assume that the volume and temperature of the vessel remain constant how do i start this? and how does it still equal 7atm if there are now 5 hydrogen? do i need to even worry about the hydrogen?

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