Wsheet_3-Spring11

# Wsheet_3-Spring11 - PCl 5(g PCl 3(g Cl 2(g At equilibrium...

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Worksheet # 3 1. Explain the significance of: a) a very large value of K b) a very small value of K c) a value of K of about 1.0. 2. Calculate the K value for the following reaction at 25 C. ˚ 2N 2 O (g) 2N 2 (g) + O 2 (g) HINT: What values do you need to be able to solve this problem? 3. Consider the following reaction at equilibrium at 24 C: ˚ NH 4 HS(s) NH 3 (g) + H 2 S(g) Kc = 1.58 x 10 –4 If 0.0205 mol of NH 3 (g), 0.00800 mol of H 2 S, and excess solid NH 4 HS are mixed in a one-liter container at 24 C, in what direction will the equilibrium proceed? ˚ 4. At a certain temperature, 0.0740 mol of PCl 5 (g) were introduced into a one-liter container.
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Unformatted text preview: PCl 5 (g) PCl 3 (g) + Cl 2 (g) At equilibrium the concentration of PCl 3 (g) was 0.0500 mol/L. a-What were the equilibrium concentrations of Cl 2 (g) and PCl 5 (g)? b- What is the value of Kc at the temperature of the experiment? 5. Consider the equilibrium below at 1000. C, Kc is 0.403. ˚ FeO(s) + CO(g) Fe(s) + CO 2 (g) a-If 0.0500 mol of CO(g) and excess solid FeO are confined in a one-liter container at 1000 C, ˚ what are the concentrations of CO(g) and CO 2 (g) when equilibrium is attained? b- What mass of Fe(s) is present when the system reaches equilibrium?...
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## This note was uploaded on 05/19/2011 for the course CHEM 51615 taught by Professor Fatima during the Spring '11 term at University of Texas.

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