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- 1. Multiple Choice
The following reaction is used to generate hydrogen gas in the laboratory.
Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g)
If 243 mL of gas is collected at 25.0°C and has a total pressure of 745 mm Hg, what mass of hydrogen is produced? A possibly useful table of water vapor pressures is provided.0.0190 g H20.0570 g H20.0717 g H20.0386 g H2 - 2. Multiple ChoiceWhen a sample of zinc completely reacted with an excess of hydrochloric acid, 127 mL of hydrogen was collected over water at 10.0◦C. The external pressure was 737.7 Torr. What was the number of moles of hydrogen collected? The vapor pressure of water at 10.0◦C is 9.21 Torr.0.00524mol0.0105mol1.48mol92.5mol
- 3. Multiple ChoiceWhen a sample of zinc completely reacted with an excess of hydrochloric acid, 127 mL of hydrogen was collected over water at 10.0◦C. The external pressure was 737.7 Torr. How many grams of zinc reacted? The vapor pressure of water at 10.0◦C is 9.21 Torr.0.323g Zn0.685g Zn1.37g Zn0.171g Zn
- 4. Multiple ChoiceConsider the laboratory setup to collect oxygen gas from the decomposition of potassium chlorate. Any time a gas is collected over water, the gas collected is actually mixed with a small amount of water vapor. In the setup shown, which volume of gas collected would be larger?O2 because it has a larger molar massH2O because it has a smaller molar massThe volumes will be the same because they occupy the same container.The volumes will be the same because they have the same average kinetic energy.
- 5. Multiple ChoiceWhen a sample of zinc completely reacted with an excess of hydrochloric acid, 127 mL of hydrogen was collected over water at 10.0◦C. The external pressure was 737.7 Torr. What was the number of moles of water vapor in the flask? The vapor pressure of water at 10.0◦C is 9.21 Torr.6.62x10-5mol1.32x10-4mol3.31x10-5mol2.65x10-4mol
- 6. Multiple ChoiceConsider the laboratory procedure shown to collect a sample of a gas. In these types of labs, the gas collected is never a pure sample, but always mixed with what additional gas?carbon dioxide gasoxygen gaswater vaporany diatomic gas
- 7. Multiple ChoiceA student collected 100.mL of butane gas from a lighter via water displacement. The gas was collected at 25°C and the external barometric pressure was 1.00atm. The partial pressure of H2O at 25°C is 23.78mmHg. What was the number of moles of butane gas collected?0.00409mol0.00792mol0.00396mol0.00817mol
- 8. Multiple ChoiceJane works for the Dr. Pepper Company. She is told that she must add 4.50 liters of CO2 to each vat of Dr. Pepper at STP. How many grams of CO2 does this represent?8.84 g0.201 g0.00456 g2.29 g
- 9. Multiple ChoiceThe same number of moles of NH3 and O2 are placed in separate bulbs of equal volume and temperature under conditions when both gases behave ideally. Which statement is true?Both bulbs contain the same mass of gas.The pressure in each bulb is the same.The bulb containing O2 contains more molecules of gas.The bulb containing NH3 contains more molecules of gas.
- 10. Multiple ChoiceWhat is the volume of 0.500 mol of an ideal gas at 273 K and 760 mmHg?11.2 liters380 mL22.4 liters2.24 liters
- 11. Multiple ChoiceIn the ideal gas law
P V = n R T
which ofthe following statements is true?If n increases, P increases.If V increases, P increases.If T increases, P decreases.All answers are correct. - 12. Multiple ChoiceIn the ideal gas equation, which term is always constant?
I. P
II. V
III. n
IV. R
V. TI and IIIII, IV, and V onlyIV onlyIII only - 13. Multiple ChoiceA 12.0 mol sample of a gas is confined in a 4.27 L bulb. What is the temperature if the pressure is 3.67 atm?−257◦C15.9◦C258◦C289◦C
- 14. Multiple ChoiceUse the ideal gas law to calculate the volume occupied by 0.200 mol of nitrogen gas at 1.00 atm pressure and at 27◦C.4.9 L0.44 L22.4 L0.0821 L
- 15. Multiple ChoiceFind the number of moles of ammonia, NH3, produced from a reaction of 4 moles of nitrogen gas at STP with excess hydrogen gas.2 mol8 mol4 mol1 mol
- 16. Multiple ChoiceFor the reaction
2 HCl(g) + Na2CO3(s) → 2 NaCl(s) + H2O(l) + CO2(g)
179.2 liters of CO2 is collected at STP. How many grams of NaCl are also formed?935.1g467.5g179.2g22.4g - Answer choicesTagsAnswer choicesTags