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Unformatted text preview: tube. The initial temperature in the Erlenmeyer flask was 24°C, the final temperature was 32°C. The average temperature was therefore 28°C (301.15 Kelvin). Atmospheric pressure within the lab room was 738 mmHg. The mass of the dry 600 mL beaker was 193.1 g. Results/Data: The mass of the 600 mL beaker at the conclusion of the experiment was 417.6 g, meaning the difference, or water displaced, was 224.5 g. This is the mass of the produced nitrogen gas, which is stoichiometrically equal to the moles of MNO 2 . P Total = P H2O + P N2 738 mmHg = 28.35 mmHg + P N2 P N2 = 709.65 mmHg D=M/V 0.997044g/cm³ = 224.5 g/V V= 223.8 cm 3 = 223.8 mL = .2238 L PV = nRT (.93375 atm)(0.2238 L) = n(0.08206 atm*L/mol*K)(301.15 K) n = .0085 mol N2 = .0085 mol MNO 2 Conclusion/Discussion: .0085 mol MNO 2 = 1.208 g 1 mol MNO 2 = 142.1 g 142.1 g – 46.0 g (NO 2 ) = 96. 1 g, which is closest to Rb in terms of weight...
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- Spring '10
- Accounting, mL beaker, Erlenmeyer f lask, unknown nitrate salt