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- Jul 6, 2006
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- Pre-Dental
--- A 3.31-g sample of lead nitrate is heated in an evacuated cylinder with a volume of 1.62 L. The salt decomposes when heated, according to the equation shown below.
2 Pb(NO3)2 (s) 2 PbO (s) + 4 NO2 (g) + O2 (g)
Assuming complete decomposition of the lead nitrate, what is the total gas pressure inside the cylinder after decomposition and cooling to a temperature of 300 K? Assume the PbO (s) takes up negligible volume.
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--- Air is 20% oxygen and 80% nitrogen. What is the mass of air in an automobile tire of 19.7 L and internal pressure of 46.7 PSI at 297 K? (That pressure is the same as the 32 PSI difference you usually measure as the tire pressure 32 PSI + 14.7 PSI.; 14.7 PSI = 1 atm)
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--- How many liters of oxygen at 730 torr and 300 K is needed to burn one kilogram of isopropyl alcohol, C3H7OH?
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---A sample of N2 gas is contaminated with a gas (A) of unknown molar mass. The partial pressure of each gas is known to be 200 torr at 298 K The gases are allowed to effuse through a pinhole, and it is found that gas A escapes at three times the rate of N2. Calculate the molar mass of gas A. Suggest a possible structure.
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2 Pb(NO3)2 (s) 2 PbO (s) + 4 NO2 (g) + O2 (g)
Assuming complete decomposition of the lead nitrate, what is the total gas pressure inside the cylinder after decomposition and cooling to a temperature of 300 K? Assume the PbO (s) takes up negligible volume.
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--- Air is 20% oxygen and 80% nitrogen. What is the mass of air in an automobile tire of 19.7 L and internal pressure of 46.7 PSI at 297 K? (That pressure is the same as the 32 PSI difference you usually measure as the tire pressure 32 PSI + 14.7 PSI.; 14.7 PSI = 1 atm)
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--- How many liters of oxygen at 730 torr and 300 K is needed to burn one kilogram of isopropyl alcohol, C3H7OH?
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---A sample of N2 gas is contaminated with a gas (A) of unknown molar mass. The partial pressure of each gas is known to be 200 torr at 298 K The gases are allowed to effuse through a pinhole, and it is found that gas A escapes at three times the rate of N2. Calculate the molar mass of gas A. Suggest a possible structure.
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