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Experiment 7: DETERMINING THE MOLAR MASS OF A GAS 1- Mass of flask filled with air m1 = 2- Mass of flask filled with gas m2 35.027 g = 35.094 g 3- Mass of flask filled with water m3 = 138.100 g 4- Room temperature = 23°C + 273 = _____ K 5 – Atmospheric pressure = 760 mm Hg = 1 atm 6- Density of air under conditions of experiment = 7- Mass of water =m3 – m1 = refer to table g / cm3 g 8- Density of water = 1g / cm3 9- Volume of water = mH2O / dH2O = step 7 / step 8 = cm3 cm3 10- V.H2O = V. flask = V.gas = V. air = 11- Mass of air m air = d air x Vair =step 6 x step 10 = g 12- Mass of empty flask = m1 – m air = step 1 – step 11 = g 13- Mass of gas = m2 – m flask = step 2 – step 12 = g 14- Molar mass of a gas = m gas x R x T / P x V 15- MM = step. 13 g x (0.0821 L .atm / K.mol ) x ____ K 1atm x step. 10 x 10-3 L 16 – MM of the gas = g / mol 17
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