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Chapter 14 Lecture 3

# Chapter 14 Lecture 3 - Chapter 14 Lecture 3 Section 14.5 is...

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Chapter 14 Lecture 3 Section 14.5 is a collection of problems in which you quantitatively try to figure out what equilibrium concentrations are. Here you get to build and think through what happens in a chemical reaction. It is exciting as well as challenging. Throw some reactants together, make some measurements and find the equilibrium constant. Or, knowing the equilibrium constant, and the initial amounts you can find the equilibrium concentrations. It’s called algebra, knowing some of the variables you can find the rest. DP’s approach will be to work a series of examples starting with the easy ones first. It is critical you learn this thinking because you can not memorized the answer, only the procedure for finding the answer. There is no substitute for practice. Example 1: If the equilibrium reaction is: 2H 2 (g) + S 2 (g) 2H 2 S(g) Find Kc is the equilibrium concentrations are: [H 2 ] = 0.0126 [S 2 ] = 0.0063 [H 2 S] = 0.0794 Kc = ?

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Do the amounts present Jive with the Stoichiometric ratios?
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