Environmental Chemistry Assignment | Professional Essay Writers
1. Elemental analysis of an unknown pure substance indicates that the percent composition by mass is as follows:
Element Percent by mass
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
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.
c) Find the moles of the unknown solute. d) Determine the molecular formula of the solute. Get Chemistry help Today