How many grams of AlCl3 would have to be dissolved in 0.150 L of water to give a solution that has a vapor pressure of 3

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How many grams of AlCl3 would have to bedissolved in 0.150 L of water to give a solution that has a vaporpressure of 38.7 torr at 35 °C? Assume complete dissociation of thesolute and ideal solution behavior. (At 35 °C, the vapor pressureof pure water is 42.2 torr.)
As no information about AlCl3 is given in theproblem, only the information about water is available to workwith. Therefore, begin by calculating the mole ratio of water usingthe vapor pressures of the solution and pure water.