42-Equil-Constants-Ans

# 42-Equil-Constants-A - EQUILIBRIUM CONSTANT GCHEM II LAB CONCEPT PROBLEMS 1 Consider following equilibrium equation H2(g I2(g 2HI(g at 450.0 K If

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EQUILIBRIUM CONSTANT GCHEM II LAB CONCEPT PROBLEMS 1) Consider following equilibrium equation: H 2 (g) + I 2 (g) 2HI(g) at 450.0 K. If 5.00E-3 moles of H 2 and 2.00E-2 moles of I 2 are placed in a 5.00 L flask and allowed to come to equilibrium. The flask was analyzed and equilibrium concentration of the resulting HI was found to be 1.87E-3 M. Calculate the Kc for the reaction. R eaction H 2 (g) + I 2 (g) 2HI(g) at 450.0 K I nitial (moles/L) 1.00 x 10 -3 4.00 x 10 -3 0 C hange (+/–) -9.350 x 10 -4 -9.350 x 10 -4 +1.87 x 10 -3 E quilibrium 6.500 x 10 -5 3.065 x 10 -3 1.87 x 10 -3 5.00 x 10 -3 moles H 2 /5.00 L = 1.00 x 10 -3 M H 2 and 2.00 x 10 -2 moles I 2 /5.00 L = 4.00 x 10 -3 M I 2 K c = [HI] 2 = (1.87 x 10 -3 ) 2 = 3.4969 x 10 -6 = 17.552 Kc = 17.6 [H 2 ] [I 2 ] (6.50x10 -5 ) (3.065x10 -3 ) 1.99225 x 10 -7 2) Consider the following equilibrium equation: H 2 (g) + Br 2 (g) 2HBr(g). A mixture of 1.374 grams of H 2 and 70.31 grams of Br 2 is heated in a 2.00 L flask to 700.0 K. At equilibrium the vessel is found to contain 0.566 grams of H 2 . Calculate the K c for the reaction. R eaction

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## This note was uploaded on 07/28/2011 for the course CHM 2046c taught by Professor Staff during the Summer '08 term at UNF.

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42-Equil-Constants-A - EQUILIBRIUM CONSTANT GCHEM II LAB CONCEPT PROBLEMS 1 Consider following equilibrium equation H2(g I2(g 2HI(g at 450.0 K If

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