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I don't understand how to find the volume in this problem..

A flask containing 63.2 mL of neon gas was collected over water at 21C and 788 mm Hg. What is this volume of gas at STP? (WVP at 21C = 18.6 mm Hg)

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    $\begingroup$ Hint: what do you know about the partial pressures of the gases? What is contributing to the 788 mmHg? $\endgroup$ – jonsca Dec 9 '12 at 10:15
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    $\begingroup$ If you edit the question to reflect your initial efforts, you can flag it to be reopened. As of now, you have just copied your homework problem in as a question. More ideal would be if you could pinpoint the areas that are troubling you and ask a more conceptual question. $\endgroup$ – jonsca Dec 10 '12 at 4:39
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    $\begingroup$ This question serves as a bad example for the homework policy. $\endgroup$ – Martin - マーチン Feb 23 '16 at 8:44

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