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Unformatted text preview: CHM 2046 HOMEWORK 2 Name SEC TA 1 For 2 802(9) + 02(g) Z 2 803(%), Kc = 280. at 1000. K. For the
same reaction, KC 2 1.28 x 10 at 852 K. Use the van‘t Hoff
Equation (Worksheet 5 item 4) to find AH. Use R = 8.314 J/mol K An: 2. Use your results from above to estimate Kc at 1100. K KC: 3. Use the Kc at 1000. K in problem 1 to find the value of Kp. N
n 4. Initially, excess solid C and 1.00 atm of H2, but no CH4, are
present. What will be the partial pressures at equilibrium?.
Hints: Just ignore the solid. This requires a quadratic solution. C(s) + 2 H2(g) Z CH4(g), Kp = 0.26 P _ P _ 5. We need to obtain some product from the reaction
Fe(s) + 5c0(g> Z Fe(CO) (g), for which K > 1 at 25 0c and _H < 0.
But no product is forme at 25 °C, and very little at high T. (a) Why nothing at 25° C?
(b) Why not much at high T? (c) What can we do to get a reasonable yield of product? 6. A 0.100 M (as prepared) solution of dichloroacetic acid has an
observed [H3O+] = 0.43 M. What are the equilibrium concentrations
and the value of the equilibrium constant for the reaction shown? cc12HCOOH(aq) + H20(l) Z H3o+(aq) + cc12Hcoo’, K = ?
[CClZHCOOH] = [H3o+] =
[cc12Hcoo‘] = K = Additional Chapter 17 problems: 17, 20, 23,24, 27. ...
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- Spring '07