exam 2a f10 chem 102 with key

Exam 2a f10 chem - Name Date 1 Consider the following unbalanced oxidation-reduction reaction Fe Br2 Fe2 Br In the balanced equation the number of

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Name: __________________________ Date: _____________ 1. Consider the following unbalanced oxidation-reduction reaction: Fe + Br 2 Fe 2+ + Br In the balanced equation, the number of electrons transferred is A) 1 B) 6 C) 2 D) 4 E) none of these 2. A 18.4-g sample of HF is dissolved in water to give 2.0 x 10 2 mL of solution. The concentration of the solution is: A) 0.92 M B) 0.18 M C) 0.09 M D) 4.6 M E) 9.2 M 3. What volume of 18 M sulfuric acid must be used to prepare 2.50 L of 0.160 M H 2 SO 4 ? A) 22 mL B) 0.40 mL C) 1.2 x   10 3 mL D) 3.3 mL E) 7.2 mL 4. The oxidation state of chlorine in ClO 4 is: A) 0 B) +7 Page 1
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-7 D) +9 E) -3 5. CH 4 ( g ) + 4Cl 2 ( g ) CCl 4 ( g ) + 4HCl( g ), H = –434 kJ Based on the above reaction, what energy change occurs when 1.2 moles of methane (CH 4 ) reacts? A) 5.2 x 10 5 J are released. B) 5.2 x 10 5 J are absorbed. C) 3.6 x 10 5 J are released. D) 3.6 x 10 5 J are absorbed. E) 4.4 x 10 5 J are released. 6. What is the standard enthalpy of reaction for the combustion in oxygen of one mole of butane gas, C 4 H 10 (g), to produce liquid water and carbon dioxide? C
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This note was uploaded on 02/04/2011 for the course CHEM 102 taught by Professor Peterpastos during the Fall '08 term at CUNY Hunter.

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Exam 2a f10 chem - Name Date 1 Consider the following unbalanced oxidation-reduction reaction Fe Br2 Fe2 Br In the balanced equation the number of

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