Chapter 3 Problems
10 original chapter problems from Chemistry I, Chapter 3. Review quizzes remain in their original lessons.
Original reading → · Source answers and worked examples →
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1. At STP, which of the following occupies the greatest volume? 44.8 L of H2 or 32.0 g of CH4.
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2. If the volume of a gas at 30.0ºC and 10.0 L is reduced to 9.0 L under constant pressure. How much did the temperature decrease by?
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3. A 375 mL sample of gas at 27.0ºC exerts a pressure of 1.75 atm. What pressure (in torr) would it exert if the volume is decreased to 105 mL at a constant temperature?
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4. At 100ºC and a pressure of 4.865 atm, what volume (in L) would be occupied by 1.50 mole of He?
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AP edition reviewed standalone replacement.
Reviewed dilute ideal replacement:a7.00L vessel contains0.0300molCO₂ at300K. UseM(CO₂)=44.01g mol⁻¹ andR=0.082057L atm mol⁻¹K⁻¹. Find density in gL⁻¹ and pressure in atm. Explain the limits of the model.
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AP edition reviewed standalone replacement.
Independently measured idealized gas conditions areP1.000atm,V22.414L,n1.000mol,T273.15K. EstimateR and explain why inserting an assumed molar volume derived from an already chosenR would be circular.
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AP edition reviewed standalone replacement.
A6.00L flask at273.15K contains0.250molH₂ and0.250molHe. In the ideal-mixture model, find each partial pressure and total pressure.
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8. If a 300 L gas tank at 25.0ºC contains nitrogen, helium, and argon (partial pressures are 1.23 atm, 2.46 atm, and 3.69 atm). How many moles of each gas are present?
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9. Under identical conditions, calculate the ratio of effusion of helium compared to carbon dioxide.
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10. If chlorine gas effuses at a rate of 700 mL/min and an unknown gases effuses at a rate of 957 mL/min through the same orifice, what is the molar mass of the unknown gas?