Sample Exam IV - Department of Chemistry CHM 1220/1225 Exam...

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Department of Chemistry CHM 1220/1225 Exam IV – Sample Exam a. Write the K c expression for the following reaction: Al(NO 3 ) 3 ( s ) + 6 H 2 O( l ) ' Al(H 2 O) 6 3+ ( aq ) + 3 NO 3 - ( aq ) b. A reaction has K c = 3.6 x 10 9 . At equilibrium, there are (circle one) MOSTLY REACTANTS BOTH REACTANTS AND PRODUCTS MOSTLY PRODUCTS c. Phosgene gas, COCl 2 , decomposes into CO gas and Cl 2 gas. If K c =0.0038 for this reaction and initial concentrations are as follows: [COCl 2 ]=0.755 M , [CO]=0.030 M and [Cl 2 ]=0.030 M , in which direction will the reaction proceed? 2. For the reaction CO 2 ( g ) + H 2 ( g ) ' CO( g ) + H 2 O( g ), K c =0.0667. Calculate the equilibrium concentration of CO if the initial concentration of [CO 2 ]=[H 2 ]=1.50 M. 3. For the endothermic reaction CO 2 ( g ) + H 2 ( g ) ' CO( g ) + H 2 O( g ) predict the direction the reaction will proceed in each of the following cases by circling the correct answer: a. Add CO 2 gas FORWARD REVERSE NO CHANGE b. Remove H 2 gas FORWARD REVERSE NO CHANGE c. Add CO gas FORWARD REVERSE NO CHANGE
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Sample Exam IV - Department of Chemistry CHM 1220/1225 Exam...

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