Use PV = nRT to calculate n = number of moles.
Then moles = grams/molar mass. You have moles from the first equation and you have grams (from the difference if mass of the flask); calculate molar mass.
A vilatile liquid was allowed to evaporate in a 43.298 g flask that has a total volume of 252 ml. The temperature of the water bath was 100 degree Celsius at the atmospheric pressure of 776 torr. The mass of the flask and condensed vapor was 44.173 g.
Calculate the molar mass of the liquid?
2 answers
moles of gas = PV / RT
= 776 x .252 / 62.363 x (273+100) =0.00841 moles
which have mass of 44.173 - 43.298 g = 0.875g
molar mass = 0.875g / 0.00841 moles = 104.1 g/ mole
= 776 x .252 / 62.363 x (273+100) =0.00841 moles
which have mass of 44.173 - 43.298 g = 0.875g
molar mass = 0.875g / 0.00841 moles = 104.1 g/ mole
1 answer