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U unk MM Br 2

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U unk MM Br 2

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  1. An all-encompassing practice problem for Ch. 5…A.P. Chem A flammable gas made only of carbon and hydrogen is generated by certain anaerobic bacterium cultures in marshlands and areas where sewage drains. A pure sample of this gas is found to effuse through a certain porous barrier in 1.50 minutes. Under identical circumstances of temperature and pressure, it takes an equal volume of bromine gas 4.73 minutes to effuse. amount unk/timeunk √ Uunk MMBr2 Rateunk timeBr2 = = = UBr2 MMunk RateBr2 timeunk amount Br2/timeBr2 √ 4.73min 159.8g CH4 = 1.50min MMunk MMunk= 16.1 g/mol

  2. An all-encompassing practice problem for Ch. 5…A.P. Chem This gas is also shown to react with oxygen to produce two products; one is carbon dioxide. If 200.0 mL of this gas (from a container which is stored at STP) is reacted with 150.0 mL of O2 stored at STP, what volume of carbon dioxide, in mL, is produced if the reaction takes place at 25. 0° C and 740.0 torr. Write the balanced chemical reaction… CH4(g) + 2O2(g)→ CO2(g) + 2H2O(g) Now do the stoichiometry…find the limiting reactant. Using the relationship that 1 mole of any gas at STP has a volume of 22.4 L you get: 0.00893 mol CH4 and 0.00670 mol O2 L.R. Plugging into the ideal gas law: V = nRT/P VCO2= 84.1 mL

  3. An all-encompassing practice problem for Ch. 5…A.P. Chem If this CO2 is collected and stored in a container to which a 0.129 gram sample of SO2 is added, what would be the total pressure of the gas sample mixture? What would be the mole fraction of each gas? What about the partial pressure of each and what would be the speed (rms velocity) of each? Find the moles of SO2… Find the mole fraction of each… Use the mole fraction of the CO2 and the partial pressure of the CO2 to find the total pressure…. Find the partial pressure of the SO2… Knowing the molar mass of each gas…find velocity of each… Moles of SO2 = 0.00201 mol CSO2 = 0.375 CCO2= 0.625 CCO2(Ptot) = PCO2 PCO2=740.0 torr Ptot=1180. torr PSO2=440. torr UCO2 = 411 m/s USO2= 340 m/s

  4. An all-encompassing practice problem for Ch. 5…A.P. Chem This 84.1 mL sample of gas existing at 298 K can be described as a mixture of dimensionless particles of the gases carbon dioxide (with a mole fraction of 0.625) and sulfur dioxide (with a mole fraction of 0.375) which are moving at average speeds of 411 m/s and 340 m/s respectively without interacting with each other while colliding with their container walls 100% elastically to create a pressure of 1180 torr (1.55 atm) with 740 torr coming from the CO2 and 440 torr coming from the SO2 .

  5. An all-encompassing practice problem for Ch. 5…A.P. Chem This 84.1 mL sample of gas existing at 298 K can be described as a mixture of dimensionless particles of the gases carbon dioxide (with a mole fraction of 0.625) and sulfur dioxide (with a mole fraction of 0.375) which are moving at average speeds of 411 m/s and 340 m/s respectively without interacting with each other while colliding with their container walls 100% elastically to create a pressure of 1180 torr (1.55 atm) with 740 torr coming from the CO2 and 440 torr coming from the SO2 .

  6. An all-encompassing practice problem for Ch. 5…A.P. Chem This 84.1 mL sample of gas existing at 298 K can be described as a mixture of dimensionless particles of the gases carbon dioxide (with a mole fraction of 0.625) and sulfur dioxide (with a mole fraction of 0.375) which are moving at average speeds of 411 m/s and 340 m/s respectively without interacting with each other while colliding with their container walls 100% elastically to create a pressure of 1180 torr (1.55 atm) with 740 torr coming from the CO2 and 440 torr coming from the SO2 .

  7. An all-encompassing practice problem for Ch. 5…A.P. Chem This 84.1 mL sample of gas existing at 298 K can be described as a mixture of dimensionless particles of the gases carbon dioxide (with a mole fraction of 0.625) and sulfur dioxide (with a mole fraction of 0.375) which are moving at average speeds of 411 m/s and 340 m/s respectively without interacting with each other while colliding with their container walls 100% elastically to create a pressure of 1180 torr (1.55 atm) with 740 torr coming from the CO2 and 440 torr coming from the SO2 .

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