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April 19, 2015

Homework Help: Chemistry

Posted by Pam on Saturday, March 23, 2013 at 2:23am.

Please tell me which Gas Law equation to use to figure out this problem...

A helium balloon at 25°C, 1 atm, has a volume of 2.88 L. Additional helium is pumped into the balloon. It now contains 1.20 g of He and its new volume is 7.20 L. How many moles of helium gas did the balloon contain originally?

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