Exam3A - CHEM 1211K Practice Exam Three 1. How many moles...

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CHEM 1211K Practice Exam Three Form A 1. How many moles of NaO 2 are needed to react with 75.0 L of carbon dioxide at STP? 4NaO 2 (s) + 2CO 2 (g) 2Na 2 CO 3 (s) + 3O 2 (g) A) 0.15 moles B) 1.67 moles C) 3.35 moles D) 6.70 moles E) 13.4 moles 2. Exactly 50 mL of an unknown chlorofluorocarbon gas effused through a porous barrier in 157 s. The same volume of argon effused in 76 s under the same conditions. Which compound is the chlorofluorocarbon? A) C 2 Cl 4 F 2 B) C 2 ClF 5 C) C 2 Cl 2 F 4 D) C 2 Cl 5 F E) C 2 Cl 3 F 3 3. A gas mixture contains CO, Ar, and H 2 . What is the total pressure of the mixture if the mole fraction of H 2 is 0.35 and the partial pressure of H 2 is 0.58 atm? A) 0.603 atm B) 0.203 atm C) 1.66 atm D) 0.0552 atm E) There is not enough information to answer this question.
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CHEM 1211K Practice Exam Three Form A 4. The graph below represents the gases He, Ar, N 2 , and CH 4 all at the same temperature. Which statement regarding this graph is true ? A) Curve 3 represents N 2 . B) Curve 1 represents N 2 C) Curve 4 represents Ar. D) Curve 2 represents He. E) Curve 3 represents CH 4 . 5. Which of the following can form intermolecular hydrogen bonds (with other molecules
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Exam3A - CHEM 1211K Practice Exam Three 1. How many moles...

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