The mixture consists of 14.50 g ethane and 310.0 g of propane. What is the total vapor pressure at ­-104.0°C over this liquid mixture? - The molar mass of ethane is 30.068 g/mol. - The molar mass of propane is 44.094 g/mol - at -104 C, ethane vapor pressure is 303.000 torr and propane vapor pressure is 15.200 torr

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