Wednesday Worksheet 6 - Practice PDF

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Wednesday Worksheet #6 Calculations in Equilibrium 1. Given a chemical reaction: 2 NO3(g) ⇌ NO2(g) + NO4(g) Kc = 1.65  102 Initially there are 0.515 M of NO3 in a flask and nothing else. Solve for the equilibrium concentrations of each component in this system.

2a. Given a chemical reaction: 2 H2O2(l) → 2 H2O(l) + O2(g) KC = 3.4 If there are initially 0.200 moles of H2O2, 0.500 moles of H2O and 0.15 M of O2, what is the final concentration of O2?

2b. Given a chemical reaction: 2 H2O2(l) → 2 H2O(l) + O2(g) KC = 3.4 If there are initially 0.200 moles of H2O2, 0.500 moles of H2O and 5.0 M of O2, what is the final concentration of O2?

3a. Which of the following represent when you should consider dropping x in the denominator? A) The value for K is much larger than the value for initial concentration in the denominator B) The value for K is about equal to the value for initial concentration in the denominator C) The value for K is much smaller than the value for initial concentration in the denominator 3b. Given a chemical reaction of: N2O4(g) ⇌ 2 NO2(g) KP = 2.1  10−7 If there is originally 0.250 atm of N2O4, how much NO2 is made at equilibrium?

3c. How much N2O4 remains at equilibrium? 3d. At equilibrium, are reactants or products favored? Does the value for Kp given support your answer?

4a. Given the chemical reaction 2 CH3OH(g) ⇌ 2 CO(g) + 4 H2(g) where KP = 1.95  10−9 if there is 0.100 atm of CH3OH and 0.250 atm of CO at equilibrium, what is the concentration of H2 at equilibrium in atm?

4b. If the reaction in question 4a is at equilibrium, how would the reaction change with each of the following: a) Adding CO c) Decreasing volume b) Adding neon gas d) Adding platinum as a catalyst

4c. When you added CO to the reaction in question 4a, make a prediction on how the concentration of H2 and CH3OH changed.

4d. If the reaction in question 4a is at equilibrium and is heated, fewer products are produced. Is this reaction endothermic or exothermic?

4e. If the reaction in question 4a was rewritten as: CO(g) + 2 H2(g) ⇌ CH3OH(g) solve for KP of this reaction.

5. For each reaction, identify how each change would shift the reaction (left, right or no shift): CaCO3(s) → CaO(s) + CO2(g)

Raise pressure

2 NH3(g) → N2(g) + 3 H2(g)

Lower the volume

2 SO2(g) → SO3(g) + SO(g)

Raise the volume

LiCl(s) → Li+(aq) + Cl-(aq)

Adding a catalyst

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