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SOS Practice problems - Practice problems 1 The first order...

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Practice problems 1. The first order reaction A products has a t ½ = 180 seconds. a. What percentage of the sample remains unreacted after 900 seconds? b. What is the rate of reaction when [A]=0.50M 2. In 3 different experiments the following results were obtained ; A products Write the rate equation for this reaction and indicate the value of K 3. Given the equilibrium constant values; N 2(g) + (1/2) 0 2(g)  N 2 O(g) Kc= 2.7x10 -18 N 2 O 4(g)  2NO 2 (g) Kc = 4.6x10 -3 (½)N 2(g) + O 2(g)  NO 2(g) Kc= 4.1X10 -9 Determine the value of K for the reaction ; 2 N 2 O (g) + 3 O 2(g)  2 N 2 O 4(g) 4. 1.00 x 10^-3 mol PCl 5 is introduced into a 250.0 ml flask and equilibrium is established at 284 degrees Celsius. The reaction is PCl 5(g)  PCL 3(g) + CL 2(g) The quantity of Cl 2(g) present at equilibrium isfound to be 9.65x10^-4 moles. What is the value of K for the dissociation reaction at 284 degrees Celsius. [A] o= 1.00M t 1/2 = 50 min [A] o = 2.00M t 1/2 = 25 min [A] o = 0.50M t 1/2 = 100 min
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