67) In a gas mixture of He, Ne, and Ar with a total pressure of 8.40 atm, the mo
ID: 926928 • Letter: 6
Question
67) In a gas mixture of He, Ne, and Ar with a total pressure of 8.40 atm, the mole fraction of Ar is, if the C) 0.583 68) A gas mixture of Ne and Ar has a total pressure of 4.00 atm and contains 16.0 mol of gas. If the partial pressure C) 11.0 partial pressures of He and Ne are 1.50 and 2.00 atm, respectively. A) 0.417 B) 0.238 D) 0.357 E) 0.179 of Ne is 2.75 atm, how many moles of Ar are in the mixture? B) 12.0 A) 5.00 D) 9.25 E) 6.75 69) A gas mixture of N2 and CO2 has a total pressure of 8.00 atm and contains 12.5 mol of gas. If the partial pressure of N2 is 3.69 atm, how many moles of CO2 are in the mixture? A) 6.73 B) 5.77 C) 3.69 D) 4.31 E) 11.0 70) Sodium hydride reacts with excess water to produce aqueous sodium hydroxide and hydrogen gas: NaH (s) + H2O(l) NaOH (aq) + H2 (g) A sample of NaH weighing g will produce 982 mL of gas at 280 °C and 765 torr, when the hydrogen is collected over water. The vapor pressure of water at this temperature is 28 torr A) 925 B) 0.960 C) 2.93 D) 0.0388 E) 0.925 71) Zinc reacts with aqueous sulfuric acid to form hydrogen gas: Zn (s) + H2SO4 (aq) ZnSO4 (aq) + H2 (g) In an experiment, 177 mL of wet H2 is collected over water at 27 °C and a barometric pressure of 765 torr. How many grams of Zn have been consumed? The vapor pressure of water at 27 °C is 26.74 torr. A) 347 B) 3.47 x 105 C) 0.457 D) 457 E) 3.85 × 106Explanation / Answer
67) In a gas mixture of He, Ne, and Ar with a total pressure of 8.40 atm, the mo
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