Exam 2
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Exam 2

Course Number: CHE 110, Fall 2008

College/University: CSU Dominguez Hills

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Exam 2 Dr. Pu Chem 110, Spring 2006 Name:______________________________ Last First You must show all work for the problems in the space provided. Useful information is provided on page1 and the last two pages. Page 2 3 4 5 total Point Breakdown Pts 30 24 24 22 100 Pts gain ____1) Which of following solution has highest concentration of sulfate ion? (a) 0.1 M K2SO4 (b) 0.2 M Al2(SO4)3 (c) 0.3 M Li2SO4 (d) 0.5...

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2 Exam Dr. Pu Chem 110, Spring 2006 Name:______________________________ Last First You must show all work for the problems in the space provided. Useful information is provided on page1 and the last two pages. Page 2 3 4 5 total Point Breakdown Pts 30 24 24 22 100 Pts gain ____1) Which of following solution has highest concentration of sulfate ion? (a) 0.1 M K2SO4 (b) 0.2 M Al2(SO4)3 (c) 0.3 M Li2SO4 (d) 0.5 M CuSO4 ____2) 5pts Which of the following gases has the lowest density at STP? (a) O2 (b) H2S (c) N2O (d) CO ____3) The measured P of a van der Waals gas compared to an ideal gas is a) lower, because of the intermolecular forces b) lower, because the gas expand c) higher, because the molecules occupy space d) higher, because of the intermolecular forces ____4) What is the ratio of the diffusion rates of Cl2 and O2? (a) 0.45 (b) 0.69 (c) 0.47 (d) 0.67 ____5) A gas while expanding, absorbs 25 J of heat and does 243 J of work. What is U for the gas? (a)+268 J (b) 268 J (c) + 218 J (d) 218 J _____6) Identify the reducing agent in the following equation: Au(s) + 4H+(aq) + NO3-(aq) + 4Cl-(aq) [AuCl4]-(aq)+ 2H2O + NO(g) (a) Au (b) H+ (c) NO3(d) Cl_____7) Choose the incorrect statement (a) Temperature of two bodies are equal when the average kinetic energies of the two bodies become the same. (b) The capacity heat is the quantity of heat required to change the temperature of the system by one degree (c) The specific heat is the heat capacity for one mole of substance. (d) The law of conservation of energy can be written: qsystem + qsurroundings =0 8) 12pts 100.0g of cupper at 100C is added to a cup of 22.0C of water, and the temperature of the final Cu-water mixture is 45.5C. What is the mass of water? (specific heat of Cu = 0.385 J/g C; specific heat of water = 4.18 J/g C). Name:________________________ 9)24pts Acetylene, C2H2, are obtained by the reaction of calcium carbide with water: CaC2(s) + 2H2O(l) Ca(OH)2(s) + C2H2(g) (a) What volume of acetylene can be obtained from 100g of calcium carbide and 100g of water at 0C and 1.00atm? (b) What volume result when the temperature is 120C and the pressure is 1.00atm? 10)22 pts The combustion of methane gas is represented by the equation CH4(g) + 2O2(g) CO2(g) + 2H2O(l) H = 890.3 kJ (a) What quantity of heat, in kilojoules, is liberated in the complete combustion of 165L of methane, measured at 18.6C and 768mmHg? Assuming methane is an ideal gas. (b) If the quantity of heat calculated in part (a) should be transformed with 100% efficiency to water, to what temperature can 100 L of water at 20.0C be heated with the heat calculated from part (a)?

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