A type of reaction we will study is that having a very small K value (K,, 1). Solving for equilibrium concentrations in an equilibrium problem usually requires many mathematical operations to be performed. However, the math involved in solving equilibrium problems for reactions having small K values (K,, 1) is simplified. What assumption is made when solving equilibrium concentrations for reactions having small K values? Whenever assumptions are made, they must be checked for validity. In general, the “5% rule” is used to check the validity of assuming that x (or 2x, 3x, and so on) is very small compared to some number. When x (or 2x, 3x, and so on) is less than 5% of the number the assumption was made against, then the assumption is said to be valid. If the 5% rule fails, what do you do to solve for the equilibrium concentrations?
Answer to relevant QuestionsAt 35oC, K = 1.6 × 10-5 for the reaction 2NOCl(g) ⇌ 2NO(g) + Cl2(g) Calculate the concentrations of all species at equilibrium for each of the following original mixtures. a. 2.0 moles of pure NOCl in a 2.0- L flask b. ...Lexan is a plastic used to make compact discs, eyeglass lenses, and bullet-proof glass. One of the compounds used to make Lexan is phosgene (COCl2), a poisonous gas. Phosgene is produced by the reaction CO(g) + Cl2(g) ⇌ ...What will happen to the number of moles of SO3 in equilibrium with SO2 and O2 in the reaction 2SO3(g) ⇌ 2SO2(g) + O2(g) in each of the following cases? a. Oxygen gas is added. b. The pressure is increased by decreasing the ...Given K = 3.50 at 458C for the reaction A(g) + B(g) ⇌ C(g) and K = 7.10 at 458C for the reaction 2A(g) + D(g) ⇌ C(g) what is the value of K at the same temperature for the reaction C(g) + D(g) ⇌ 2B(g) What is the value ...For the reaction NH3(g) + H2S(g) ⇌ NH4HS(s) K = 400. at 35.0oC. If 2.00 moles each of NH3, H2S, and NH4HS are placed in a 5.00- L vessel, what mass of NH4HS will be present at equilibrium? What is the pres-sure of H2S at ...
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