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# 29 - Topics for the day Administrative stuff Gas collisions...

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Topics for the day Administrative stuff Gas collisions van der Waals equation Liquids and solids Administrative stuff Homework Quest HW3 due now (10 am, 4/2) Quest HW4 now available, due next Friday 10 am (4/9) ALEKS objective 5 due a week from next Monday (10 am, 4/12) ALEKS prep assessment scores will be updated later today. Exam 3 is coming (Wednesday 4/14) (mostly) Gases, (small amount of) Liquids & solids Practice exam coming next week Homework problems The overall class average for HW3 is 71% Here are the questions that people found harder: 1 2 3

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A. Balloon Y B. Both would be the same size C. Balloon X iClicker Time Balloon X is filled with carbon monoxide. Balloon Y is filled to the same volume with carbon dioxide. The balloons are left for several days in a room at constant temperature. Which balloon would you expect to be smallest after this period of time? Effusion rate (gas 2) Effusion rate (gas 1) M 1 M 2 = Effusion rate (CO 2 ) Effusion rate (CO) M CO2 M CO = 44 g mol –1 28 g mol –1 = = 1.25 Effusion rate (CO) = 1.25 Effusion rate (CO 2 ) CO effuses faster than CO 2 , and so that balloon will empty fastest. A. –100˚C, 2 atm B. Temperature and pressure do not affect the densities of noble gases C. 173 K, 1 atm D. 473 K, 1 atm E. 200˚C, 2 atm iClicker Time At what condition will the density of gaseous argon (Ar) be the lowest? Density δ = V m V = P nRT To get low density high V low P and/or high T δ V 1 V P 1 and V T and δ T 1 Thus δ P A. Both bulbs contain the same number of moles of gas. B. The bulb containing O 2 contains more molecules of gas. C. The pressures in the two bulbs are the same. D. The pressure in the O 2 bulb is greater than the pressure in the NH 3 bulb. E. The pressure in the NH 3 bulb is greater than the pressure in the O 2 bulb. The same number of grams of NH 3 and O 2 are placed in separate bulbs of equal volume and temperature under conditions when both gases behave ideally. Which statement is true? Changes? P, n Constant? V, T, m P NH3 = MW NH3 V mRT MW NH3 m n NH3 = MW NH3 < MW O2 for the same m, n NH3 > n O2 P NH3 MW NH3 = P O2 MW O2 = V mRT = = = 1.88 P NH3 P O2 MW O2 MW NH3 32 17 P NH3 = 1.88 P O2 4 5 6
Calculation Time Calculate the volume of methane (CH 4 ) produced by the bacterial breakdown of 0.8 kg of sugar (C 6 H 12 O 6 ) at 343 K and 786 torr.

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