Lab #4 Stoichiometry and the Ideal Gas law

Lab #4 Stoichiometry and the Ideal Gas law - PV= nRT n =...

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Stoichiometry and the Ideal Gas Law by Erin Samplin Lab Instructor: Xiaoxiao Li October 16, 2007
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Purpose – to determine the identity of an unknown nitrite salt using the ideal gas law and the following equation: MNO 2(aq) + HSO 3 NH 2(aq) MHSO 4(aq) + H 2 O 2(l) + N 2(g) Results and Discussion Table 1: Mass of objects taken Object Mass (grams) Empty 600 mL beaker 222.6 Unknown salt 2254 in vial 17.614 Empty Vial 16.646 Unknown salt 2254 [unknown salt – empty vial] 0.968 Water in 600 mL beaker after reaction 526.5 Water after reaction [water after reaction – empty beaker] 303.9 Volume = Mass = 303.9 grams = 303.9 mL Density 1.0 g/mL P = 75.35 cmHg x (10 mmHg / ccHg) x (1 atm / 760 mmHg) = 0.99144737 atm V = 303.9 mL x (1 L / 1000 mL) = .3039 L n = ? R = 0.08206 atm x L / mol x K T = 23 ° C + 273 = 296 K
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Unformatted text preview: PV= nRT n = 0.012 moles N 2 = 0.012 moles MNO 2 Molar Mass = mass MNO 2 = 0.968 grams MNO 2 = 80.667 grams moles MNO 2 0.012 moles MNO 2 Mass of NO 2 = 46.01 grams 80.667 grams MNO 2 46.01 grams NO 2 = 34.657 grams M M = Potassium [K] The percent error was thus calculated to quantify the accuracy of the results. Percent error = accepted value measured value x 100 = 39.10 grams 34.657 grams x 100 = 11.36% accepted value 39.10 grams Because only one trial was performed, average deviation and relative average deviation values could not be calculated. Therefore, the precision of the experiment was not accounted for. Conclusion The identity of the unknown nitrite salt (M) #2254 is Potassium, K....
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This note was uploaded on 03/20/2008 for the course CHEM 2070 taught by Professor Chirik,p during the Fall '05 term at Cornell University (Engineering School).

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Lab #4 Stoichiometry and the Ideal Gas law - PV= nRT n =...

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