Lab Report 08 Molecular Weight of Air

# Lab Report 08 Molecular Weight of Air - Results Part 1...

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Experimental: Required Equipment 2000 mL Graduated  Cylinder Overflow tank Helium-filled balloon Squeeze-bulb Twist tie Balance Thermometer Pressure sensor A balloon previously filled with helium was obtained, and its mass was measured on a  balance.  The twist tie on the balloon was undone and all the helium air was allowed to escape.  Then a squeeze-bulb was taken and the balloon was filled up with air and the mass was taken  again.  The difference between M He  and M air  is ΔM. In the second part of the experiment the same balloon that is filled up with air was taken  to an overflow tank, and submerged completely under water.  The water that spilled out was  collected and measured in a 2000 mL graduated cylinder, and that was said to be the volume of  the balloon.  The pressure of the laboratory was calculated using a pressure sensor, and the  room temperature was obtained using a thermometer.

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Unformatted text preview: Results: Part 1 Helium filled balloon: 1.57 g Air filled balloon: 2.99 g ΔM = M air - M He =2.99 – 1.57 = 1.42 Group Number M He M air ΔM 1 1.57 g 2.99 g 1.42 g 2 1.50 g 2.92 g 1.42 g 3 1.35 g 2.93 g 1.58 g 4 1.52 g 2.94 g 1.42 g 5 1.45 g 2.89 g 1.44 g Average 1.48 g 2.93 g 1.46 g ΔM = 1.46 g Part 2 Volume: 1240 mL = 1.240 L Pressure: 0.892 atm Temperature: 291.8 K Gas constant: 0.082 Latm/molK PV=nRT 0.892 x 1.24 L = n x 0.082 x 291.8 1.106 = n x 23.928 0.0462 mol = n 0.0462 mol of He and air ΔM = (n x molar mass of air) – (n x molar mass of He) 1.46 = (0.0462 x molar mass of air) – (0.462 x 4) 1.46 = 0.0462x – 0.1848 1.64 = 0.0462x 35.6 g/mol = x = molar mass of air Percent error: (theoretical – experimental) / theoretical Theoretical = 28.97 g/mol (28.97 – 35.6) / 28.97 = 0.228 = 22.8% error...
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Lab Report 08 Molecular Weight of Air - Results Part 1...

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