Sample Exam Three - ekarika(ufe56 Sample Exam Three...

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ekarika (ufe56) – Sample Exam Three – Shear – (52375) 1 This print-out should have 27 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. DrRuth says: In all cases, select the answer that BEST answers the question asked. Read the whole thing first and plan which to answer first because you feel confident about them. Notice the harder ones and save them up till last so you don’t use up all your time working on them. Shear 52375 g = 9 . 8 m / s 2 1 atm = 101325 Pa = 760 torr R = 0.08206 L atm K 1 mol 1 R = 0.08314 L bar K 1 mol 1 R = 8.314 J K 1 mol 1 ( P + a ( n/V ) 2 )( V - nb ) = nRT 001 10.0 points Consider the reaction 2 CH 4 (g) + 3 O 2 (g) + 2 NH 3 (g) 2 HCN(g) + 6 H 2 O(g) If 128 g each of NH 3 and CH 4 and an excess of O 2 are reacted, what mass of HCN can be produced? 1. 203 g HCN 2. 216 g HCN 3. 419 g HCN 4. The answer cannot be determined from information available. 5. 610 g HCN 002 10.0 points Write the net ionic equation for this reac- tion occuring in water: Barium perchlorate and sodium sulfate are mixed to form sodium perchlorate and barium sulfate. 1. 2 Na + + 2 ClO 4 2 NaClO 4 2. SO 2 4 + Ba(ClO 4 ) 2 2 ClO 4 + BaSO 4 3. 2 Na + + 2 ClO 3 2 NaClO 3 4. SO 2 4 + Ba 2+ BaSO 4 5. No reaction occurs. 003 10.0 points For a sample of gas held at constant temper- ature, a plot of volume versus pressure is a straight line. 1. True 2. False 004 10.0 points A certain quantity of a gas occupies 61.3 mL at 68 C. If the pressure remains constant, what would the volume of the gas be at 17 C? 1. 32 mL 2. 72 mL 3. 52 mL 4. 92 mL 005 10.0 points A sample of helium (He) occupies 4 liters at STP. What pressure is necessary to change the volume to 2 liters at 25 C? 1. 2.1464 atm 2. 2.36 atm 3. 4.0 atm 4. 2.0 atm 5. 4.36 atm 006 10.0 points How many moles of O 2 will be present in a
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ekarika (ufe56) – Sample Exam Three – Shear – (52375) 2 3.00 L sample of the gas collected at 25 C and 0.900 atm?
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