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October 23, 2014

Homework Help: physics/chemistry

Posted by kate on Monday, January 3, 2011 at 9:57pm.

(a) An ideal gas occupies a volume of 1.0 cm3 at 20C and atmospheric pressure. Determine the number of molecules of gas in the container.
i got that right to be 2.5e19 molecules
(b) If the pressure of the 1.0 cm3 volume is reduced to 1.0 10-11 Pa (an extremely good vacuum) while the temperature remains constant, how many moles of gas remain in the container?
im not sure how to do this part. and i keep getting it wrong. can you please help me?

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