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Environmental Chemistry Assignment | Professional Essay Writers

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February 18th, 2020

1. Elemental analysis of an unknown pure substance indicates that the percent composition by mass is as Tom

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Element                 Percent by mass

Carbon                      49.02%

Hydrogen                  2.743%

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Chlorine                    48.23%

A solution that is prepared at 35°C by dissolving 3.000 grams of the nonvolatile nonionizing substance in 25.00 grams of benzene, C6H6.

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a) Determine the empirical formula of the unknown substance.

b) The vapor pressure of pure benzene at 35°C is 150. millimeters of Hg. If the vapor pressure of the solution is 141 mmHg find the mole fraction of the benzene.

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c) Find the moles of the unknown solute.

d) Determine the molecular formula of the solute. Get Chemistry help Today

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