For the reaction PCI3(g) + Cl2(g) = PCIs(g) at a particular temperature, Kc= 6.7. Suppose a system at that temperature is prepared with [PCI5] =0.50 M, [Cl2) = 0.40 M, and [PCI3] = 0.10 M.How does Q compare to K and in which direction will the reactionproceed?Q>K; the system will proceed in the direction of the productsO Q=K; the system is at equilibrium.Q>K; the system will proceed in the direction of the reactantsQ

Given : [PCl5] = 0.50M [Cl2] = 0.40M [PCl3] = 0.10M

Answered: For the reaction PCI3(g) + Cl2(g) =…

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter12: Chemical Equilibrium

Section: Chapter Questions

Problem 7QRT

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A common 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 perfomed. However, the math involved when solving equilibrium problems for reactions having small K values (K 1) is simplified. What assumption is made when solving the equilibrium concentrations for reactions with 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 x (or 2 x, 3x, and so on) is very small compared to some number. When x (or 2 x. 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?

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