ThetaSigma87 Posted December 5, 2016 Share Posted December 5, 2016 Im doing a lab, trying to find the molar volume of a gas. I'm stuck on a step that is asking for the vapor pressure of water. This is all the data I have collected for two separate trials. -Mass of Magnesium: T1:45g T2:46g -Volume of Gas Mixture: T1:48mL T2:50mL -Atmospheric Pressure: T1:750.81torr T2:749.554torr -Water Bath Temperature: T1:20C T2:18C Vapor Pressure of Water: T1:? T2:? I know you can't give me the answer, I just need to know what to do to find the vapor pressure. I am completely lost on this and I feel like it is incredibly simple. Link to comment Share on other sites More sharing options...
steph33 Posted December 9, 2016 Share Posted December 9, 2016 T1 temperature at which the vapor pressure is known T2 temperature at which the vapor pressure is to be found use formula ln(P1/P2) = (ΔHvap/R)((1/T2) - (1/T1)) good luck Link to comment Share on other sites More sharing options...
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