Assigned problems _3 - Rate = k[Cl 2 ] a [CO] b [COCl 2 ] c...

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Chemistry 2080 Spring 2011 Problem Set #3 - due date: Friday February 18th at 2 pm Name:________________ Lab TA Name:__________________ Lab Day/Time:______________________ 1) Given the following data, calculate the value of Δ f (the standard enthalpy of formation) of H 2 SO 4 (aq) in kJ/mol. Assume all temperatures are 25°C. SO 3 (g) + H 2 O (l) –––––––––> H 2 SO 4 (aq) Δ = - 227.8 kJ S (s) + O 2 (g) ––––––––––> SO 2 (g) Δ = - 296.8 kJ SO 2 (g) + 1 /2 O 2 (g) –––––––> SO 3 (g) Δ = - 98.9 kJ For H 2 O (l) Δ f = - 285.8 kJ/mol
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2) Phosgene (COCl 2 ) is a highly toxic gas that can be prepared by the following reaction: Cl 2 (g) + CO (g) –––––––> COCl 2 (g) The method of initial rates was used to determine the order of the reaction:
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Unformatted text preview: Rate = k[Cl 2 ] a [CO] b [COCl 2 ] c Expt. [Cl 2 ] (M) [CO] (M) [COCl 2 ] (M) Rate [M/s] 1 0.0205 0.0620 0.0152 3.06 x 10-2 2 0.0310 0.2040 0.0215 1.88 x 10-1 3 0.0515 0.0620 0.0152 1.22 x 10-1 4 0.0205 0.2040 0.0152 1.01 x 10-1 (a) Determine the order of the reaction with respect to Cl 2 , CO and COCl 2 , i.e. find a, b and c. (b) Determine the rate constant k. (c) Determine what the initial rate would be if [Cl 2 ] = 0.040 M ; [CO] = 0.105 M ; and [COCl 2 ] = 0.0184 M...
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Assigned problems _3 - Rate = k[Cl 2 ] a [CO] b [COCl 2 ] c...

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