apch16_studyqxns - South Pasadena AP Chemistry Name _...

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South Pasadena AP Chemistry Name ____________________________________ Period ___ Date ___/___/___ 16 Chemical Equilibrium STUDY QUESTIONS & PROBLEMS 1. Write the expressions for the equilibrium constant K c for the following reactions: a. 4 NH 3 (g) + 7 O 2 (g) 4 NO 2 (g) + 6 H 2 O(l) b. HCN (aq) + H 2 O(l) H 3 O + (aq) + CN - (aq) c. PCl 5 (g) + PCl 3 (g) + Cl 2 (g) d. CaCO 3 (s) CaO(s) + CO 2 (g) e. 3 O 2 (g) 2 O 3 (g) f. 2 H 2 O(l) H 3 O + (aq) + OH - (aq) g. 3 Zn(s) + 2 Fe 3+ (aq) 2 Fe(s) + 3 Zn 2+ (aq) 2. Write the equilibrium constant expressions for the following reactions. How are they related to one another? a. 2 N 2 O(g) + 3 O 2 (g) 4 NO 2 (g) b. N 2 O(g) + 3 / 2 O 2 (g) 2 NO 2 (g) c. 4 NO 2 (g) 2 N 2 O(g) + 3 O 2 (g) 3. Calculate the value of the equilibrium constant for the following system, given the data shown: H 2 (g) + CO 2 (g) H 2 O(g) + CO(g) Concentrations at equilibrium: [H 2 ] = 1.5 mol Liter -1 [CO 2 ] = 2.5 mol Liter -1 [H 2 O] = 0.5 mol Liter -1 [CO] = 3.0 mol Liter -1 4. Chlorine molecules will dissociate at high temperatures into chlorine atoms. At 3000 ° C, for example, K c for the equilibrium shown is 0.55. If the partial pressure of chlorine molecules is 1.5 atm, calculate the
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apch16_studyqxns - South Pasadena AP Chemistry Name _...

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