Calculate the mass of propylene glycolc3h8o2 that must be, Ask an Expert

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Calculate the mass of propylene glycolC3H8O2 that must be added to 0.320kg of water to reduce the vapor pressure by 2.88torr at 40C Pressure H2O 40C 55.3torr. I need a little more than numbers like in the previous ones. Because I couldnt do it by seeing those.

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