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What mass in grams of glucose (MM=180.2g/mol) would need to be dissolved in 100.0g of water to decrease the vapor pressure of the solution to 22.0 torr? ( P of water is 23.5 torr) The percent by mass of methanol (MM =32.04g/mol) in an aqueous solution is 61.1. What is the molality of the methanol solution? Two volatile substances are mixed with one another so that substance A has a mole fraction of 0.75. Given the information in the table below, what is the vapor pressure of the solution in torr