Chem 1331 Midterm 2

1. | | | What is the pressure, in atm, of a tank of gas with a regulator that reads 1250mmHg? | | | Student Response | Correct Answer | A. | 1.64 | | B. | 490 | | C. | 1.79 | | D. | 0.608 | | E. | 1.25 | | | Score: | 0/1 | | | 2. | | | A 147.9-L sample of dry air is cooled from 88.0°C to 22.1°C while the pressure is maintained at 2.85 atm.

What is the final volume in L? (Do not type the units.) | | | Student Response | Correct Answer | Answer: | not answered | 120.9 | | Score: | 0/1 | | | 3. | | | 1000 L of gas is prepared in a tank at 700 mm Hg and 2000 oC. The gas is then transferred to a 40.0 L tank at 200o C. The pressure inside the new tank is | | | Student Response | Correct Answer | A. | 14 mm Hg | | B. | 70 mm Hg | | C. | 280 mm Hg | | D. | 1.75 x 10 3 mm Hg | | E. | 3.64 x 103 mm Hg | | | Score: | 0/1 | | | 4. | | | The density of an unknown element in the gaseous state is 1.60 g at 300 K and 1 atm. Which of the following could be the element? | | | Student Response | Correct Answer | A. | He | | B. | Ne | | C. | Ar | | D. | | | E. | | | | Score: | 0/1 | | | 5. | | | What is the pressure exerted by a mixture of 0.250 moles of and 0.400 moles of He at 27.0C in a 3.00 L container? | | | Student Response | Correct Answer | A. | 16.0 atm | | B. | 5.33 atm | | C. | 3.28 atm | | D. | 2.05 atm | | E. | 1.23 atm | | | Score: | 0/1 | | | 6. | | | At 25°C, an unknown gas, Q, diffuses at a RATE 1.65 times faster than that of propane, C3H8. Which of these gases is most likely to be Q? | | | Student Response | Correct Answer | A. | O2 | | B. | He | | C. | Ne | | D. | H2O | | E. | CH4 | | | Score: | 0/1 | | | 7. | | | In the reaction below,