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Home Q & A Board Biology-Related Homework Help Environmental and Conservation Biology
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oaklandowns oaklandowns
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11 years ago
A 2.95 -g sample of an unknown chlorofluorocarbon is decomposed and produces 586 mL of chlorine gas at a pressure of 750 mm Hg and a temperature of 298 K.
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#1
11 years ago
You'll need to use the ideal gas law  PV=nRT to determine the number of moles of the substance present as a gas.  You might have to work with some unit changes for the correct coefficient "R", but you have V, P and T.  Just solve for n.
Then, knowing the number of g-moles of chlorine, you can determine the number of grams of chlorine from the molecular weight.  
Once you know the amount of mass (g), just divide by the original mass to get a percentage.

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