1.) mass of air in flask in grams 2.) mass of empty flask in grams 3.) mass of g
ID: 1015149 • Letter: 1
Question
1.) mass of air in flask in grams 2.) mass of empty flask in grams 3.) mass of gas in flask in grams 4.) molar mass of gas in grams per mole Part 2: Determination of the Molar Mass of Gases Barometric pressure (mmHg):45mm Ha Room temperature (°C): C Room temperature (c): 23 0 C CO2 Natural Gas 13.15 148.72 Mass of flask/stopper filled with air (g) Mass of flask/stopper filled with gas (g) Volume of water used to fill flask (mL) 210.0 200.0 Part 3: Determination of the Molar Mass of an Unknown Liquid 2 l . Water bath temperature (oc):
Explanation / Answer
Mass of flask, stopper, and air, g 113.159
Mass of flask, stopper and CO2, g 113.199
Volume of flask = 270.09 ml = 0.27009L
Barometric pressure = 745 mm Hg
Room temperature in Celsius 230C
Density of air at 230C = 1.189 g/L
Mass in of air in flask = VD = 0.27009 L x 1.189g/L = 0.321g
2.) Mass of empty flask in grams
Mass of flask, stopper, and air Mass in of air in flask
113.159g - 0.3211370g = 112.838
3) Mass of gas in flask in grams
Mass of flask, stopper, and gas Mass of empty flask
113.199g - 112.838 g = 0.361g
4.) Molar mass of gas in grams per mole
Moles of gas = PV/RT
= (0. 98026 atm x 0.27009L)/(8.20578 x 10-2 L atm K-1 mol-1 x 296K)
= 0.0109 moles
Molar mass of gas in grams per mole = mass of gas/ moles of gas
= 0.361g/ 0.0109 moles
= 33.119g/mole
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