Practice exam 2(5-8) - M2 M1 r 1 =CHEM 1411 Practice...

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M 2 M 1 = r 1 r 2 CHEM 1411 Practice Exam#2 (chapters 5-8)) Name:______________________ Score: Part I. Multiple choice questions (2 points each) Direction-Please write your correct choice in space provided -----1. How many moles of N 2 gas occupy 11.2 liters volume a STP condition? A. 1.0 mol B. 2.0 mol C. 0.5 mol D. cannot be determine -----2. Which of the following is/are not characteristic of gases? I. high density II. formation of homogeneous mixtures III. low intermolecular forces A. I only B. I and III C. I, II, and III D. II and III -----3. An unknown gas " X " effuses four times faster than a sample of SO 2(g) through a porous container. Which of the following is the unknown gas ? A. H 2 B. CH 4 C. He D. NO ------4. What volume of air at 760 torr would have to be put into a car tire with a volume of 15 L if the pressure in the car tire is to be 2.38 atm? A. 6.3 L B. 35.7 L C. 0.05 L D. 21.3 L ------5. If 400 mL of a gas sample at 25˚C expands to 600 mL, the resulting temperature of the gas is A. 37.5˚C B. 433.5˚C C. 174˚C D. 447˚C ------6. At STP, 48 g of O 2 will occupy… A. 67.2 L B. 33.6 L C. 22.4 L D. 32 L ------7. In which of the following states of matter there is almost no difference in physical behavior between different compounds? A. solid B. liquid C. gas D. all of the above ------8. In a combustion reaction…….
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to form a compound B. A substance rapidly reacts with oxygen to produce heat and light C. Carbon reacts with bromine to produce carbon tetrabromide D. Non of the above ------9. The standard enthalpy of formation (ΔH° f ) for any element in its standard state is A. 0 B. 100 kj mol −1 C. 10 kj mol −1 D. − 100 kj mol −1 -----10. How many kJ of heat must be removed from 1000. g of water (specific heat 4.184 J /g.˚C) to lower the temperature from 18.0°C to 12.0°C? A. 2.5x10 -2 kJ B. 1.4 kJ C. 4.2 kJ D. 25 kJ -----11. From the following heats of reaction, 2C (graphite) + H 2 (g) C 2 H 2 (g) ΔH˚ = 227 kJ/mole 6C (graphite) + 3H 2 (g) C 6 H 6 (l) ΔH˚ = 49 kJ/mole calculate the heat for the reaction 3C 2 H 2 (g) C 6 H 6 (l) a. 632 kJ/mole b. -632 kJ/mole c. -178 kJ/mole d. 178 kJ/mole ----12. The heat of combustion of fructose, C 6 H 12 O 6 , is -2812 kJ/mole. Using the following information, calculate f for fructose. C 6 H 12 O 6 (s) + 6 O 2 (g) 6 CO 2 (g) + 6 H 2 O (l) ΔH° f ( CO 2 ) = -393.5 KJ/mole ΔH° f (H 2 O) = - 285.83 KJ/mole A. -210.3 kJ B. 210.3 kJ C. -1264 kJ D. 1264 kJ ----13. Consider the combustion reaction of ethane gas, C 2 H 6 (g): C 2 H 6 (g) + 7/2O 2 (g) 2CO 2 (g) + 3H 2 O(g) ΔH˚ = -1430 kJ What is the enthalpy change for the reverse reaction if whole number Coefficients are used? A.
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This note was uploaded on 05/05/2010 for the course CHEM 22726 taught by Professor Shaikh during the Spring '10 term at University of Houston - Downtown.

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Practice exam 2(5-8) - M2 M1 r 1 =CHEM 1411 Practice...

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