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exam1fall2011f4

exam1fall2011f4 - GeneralChemistryI exam1 R.LopezdelaVega...

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General Chemistry I exam 1 4/22/2011 R. Lopez de la Vega Name_____________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Determine the molality of an aqueous solution prepared by dissolving 0.112 moles of LiCl in 13.7 moles of H 2 O. A) 0.818 m B) 0.220 m C) 0.122 m D) 0.153 m E) 0.454 m 1) 2) Determine the solubility of CO 2 in soda water at 25°C if the pressure of CO 2 is 5.2 atm. The Henry ʹ s law constant for carbon dioxide in water at this temperature is 3.4 × 10 - 2 M/atm. 2) 3) The first - order decay of radon has a half - life of 3.823 days. How many grams of radon decomposes after 5.55 days if the sample initially weighs 100.0 grams? 3) 4) Determine the freezing point of a solution that contains 78.8 g of naphthalene (C 10 H 8 , molar mass = 128.16 g/mol) dissolved in 722 mL of benzene (d = 0.877 g/mL). Pure benzene has a melting point of 5.50°C and a freezing point depression constant of 4.90°C/ m . 4) 5) What are the units of k in a zero order reaction? A) M 2 s B) M s C) s M 2 D) Ms E) M - 1 s - 1 5) 6) Determine the rate law and the value of k for the following reaction using the data provided. S 2 O 8 2 (aq) + 3 I (aq) 2 SO 4 2 (g) + I 3 (aq) [S 2 O 8 2 ] i (M) [I ] i (M) Initial Rate (M - 1 s - 1 ) 0.30 0.42 4.54 0.44 0.42 6.65 0.44 0.21 3.33 A) Rate = 120 M - 2 s - 1 [S 2 O 8 2 ] 2 [I ] B) Rate = 23 M - 1/2 s - 1 [S 2 O 8 2 ][I ] 1/2 C) Rate = 195 M - 3 s - 1 [S 2 O 8 2 ] 2 [I ] 2 D) Rate = 86 M - 2 s - 1 [S 2 O 8 2 ][I ] 2 E) Rate = 36 M - 1 s - 1 [S 2 O 8 2 ][I ] 6)
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