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 -----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 ? ------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? ------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… ------7. In which of the following states of matter there is almost no difference in physical behavior between different compounds? ------8. In a combustion reaction…….
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------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? -----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 ± ΔH° 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
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