srping17.rtf - Multiple Choice Questions(6.67 pts each 1...

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Multiple Choice Questions: (6.67 pts each) 1) How many moles of hydroxide ions are there in 25 mL of 0.010M solution of Ba(OH)2? a. 7.5 x 10-1 mol b. 5.0 x 10-1 mol c. 2.5 x 10-1 mol d. 5.0 x 10-4 mol e. 2.5 x 10-4 mol 2) What is the molarity of a solution that contains 46 grams of Na2SO4 (Mw = 142 g/mol) dissolved in enough water to make 750 mL of solution? a. 2.3M b. 0.60M c. 0.52M d. 0.43M e. 0.19M 3) Imagine that you go into the lab and measure 35 mL of a 0.60M stock solution. You pour the 35 mL of stock solution into a beaker and dilute the solution by adding another 35 mL of water. What is the molarity of the new solution? a. 1.2M b. 0.60M c. 0.30M d. 0.15M e. 0.040M 4) Which of the following expressions is the correct expression for the equilibrium constant, K, for the following reaction? P4(s) + 5O2(g) P4O10(s)
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a. b. c. d. e. 5) If for a certain gas phase reaction mixture Q = 1, what can you say about the reaction? a. The reaction will proceed towards the product to achieve equilibrium. b. The equilibrium position will be determined by the value of K. c. The reaction will proceed to the left to achieve equilibrium. d. The reaction is already at equilibrium. e. The reaction will go to completion. City University of New York GenChemII Spring 2018 Exam 1A 2 For questions 6-9 consider for the hypothetical reaction 2X(g) à X2(g) 6) If we increase the volume of the container, then the equilibrium will _______ and the partial pressure of X2(g) will ____________. a. Shift to the left, decrease b. Shift to the left, increase c. Shift to the right, decrease d. Shift to the right, increase e. Not shift, not change 7) If you decrease the temperature of this reaction the equilibrium will shift to the________ and the value of K will __________. a. right, not change b. right, decrease c. right, increase
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d. left, decrease e. left, increase 8) In the concentration versus time plot for this reaction, the product is indicated by _________ and the reaction reaches equilibrium at _________.
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