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At 20.0°C, the vapor pressure of ethanol is 45.0 torr, and the vapor pressure of methanol...

At 20.0°C, the vapor pressure of ethanol is 45.0 torr, and the vapor pressure of methanol is 92.0 torr. What is the vapor pressure at 20.0°C of a solution prepared by mixing 31.0  g methanol and 72.0  g ethanol?

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