UO CH 228 - The Ideal Gas Law and the Determination of the Gas Constant (5 pages)

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The Ideal Gas Law and the Determination of the Gas Constant



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The Ideal Gas Law and the Determination of the Gas Constant

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Pages:
5
School:
University of Oregon
Course:
Ch 228 - Gen Chemistry Lab

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Gases defined by 4 properties 15 The Ideal Gas Law and the Determination of the Gas Constant R Gas Simulation http intro chem okstate edu 1314F00 Laboratory GLP htm R ideal gas constant P pressure V volume n number of moles of gas T temperature Kelvin 1 P V T V n V V nT P V nRT P PV nRT An ideal gas behaves according to the assumptions of kinetic molecular theory for 1 mole of gas at STP P 1 atm V 22 414 L T 273 15 K R PV 1atm 22 414 L L atm 0 0821 nT 1mol 273 15K mol K 1 Gas Simulation http intro chem okstate edu 1314F00 Laboratory GLP htm Deviations from ideality low temperature Oxygen Our goal in lab this week measure the properties of a sample of oxygen not at STP verify the value of R Is R constant within the limits of experimental error high pressure boiling point 183 C Do you expect it to behave ideally decompose potassium chlorate to generate oxygen gas 2KClO3 s 2KCl s 3O2 g 2KClO3 s 2KCl s 3O2 g Goal determine n V P T and calculate R 2KClO3 s 2KCl s 3O2 g 1 KClO3 MnO2 O2 O2 Calculate n weigh solid before and after heating before mass KClO3 MnO2 after mass KClO3 MnO2 KCl difference mass O2 mol O2 n mass loss 32 00 g 2 2 Determine Volume for volume determination weigh beaker empty and with water mass volume therefore mass H 2O volume density d KClO3 MnO2 O2 O2 Appendix A Volume H2O displaced Volume O2 generated 3 Determine temperature 4 Determine pressure measure temperature of the water assume T O2 T H2O atmospheric pressure gauge in lab Be sure to record the pressure before leaving lab it can change quickly but the gas contains water vapor too Patm PO2 PH2O Patm PH2O PO2 Appendix B What do we mean by experimental uncertainty Calculate R R PV nT A B C But how much confidence do you have in your answer Is the calculated value the same as the literature value within the range of expected uncertainty A and C are measured values B mean or average standard deviation reflects the uncertainty in the mean 3 But all data values also have an associated uncertainty A B



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