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Current Attempt in Progress Incorrect. A solution of ethanol. C2H5OH, in water has a concentration of 1.620molL1. At 20.0C its density is 0.9677gmL1. following: (a) the molality of the solution (b) the mass percent of the alcohol in the mixture % The vapor pressure of a mixture of 400g of carbon tetrachioride and 43.3g of an unknown compound is 137 torr at 30C. The vapor pressure of pure carbon tetrachloride at 30C is 143 torr, while that of the pure unknown is 85 torr. Based upon this, the approximate molecular mass of the unknown rounded to 3 significant digits is 8/mol Please note, that we do not use rounded values in calculation steps and make roundings at the final step only to report the accurate value. Explain why potassium chloride will not dissolve in carbon tetrachloride, CCl4, by selecting the single best answer. Potassium and carbon don't form compounds. There are no solvating forces in carbon tetrachloride that can overcome the very strong ion-ion forces in solid KCl. Carbon tetrachloride already has the maximum amount of chloride ion possible. The bonds within the carbon tetrachloride molecule are too strong to be overcome by KCl