Consider the equilibrium system described by the chemical reaction below. For this reaction, Kc = 2.1 × 10³ at a certain temperature. If the equilibrium concentrations of H₂ and F₂ are both 0.0021 M, determine the concentration of HF at equilibrium.

World of Chemistry, 3rd edition
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ISBN:9781133109655
Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste
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Chapter17: Equilibrium
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Problem 39A
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Consider the equilibrium system described by the chemical reaction below. For this reaction, Kc = 2.1 × 10³ at a certain temperature. If the equilibrium concentrations of H₂ and F₂ are both 0.0021 M, determine the concentration of HF at equilibrium. 

Expert Solution
Step 1

The equilibrium reaction of H2 and F2 is given below. 

H2+F22HF

Equilibrium concentration are ratio of concentration of products to reactant and stoichiometry will come into the power of every substance so equilibrium constant expression is given below.

Kc=[HF]2[H2][F2]

Where Kc is equilibrium constant, [HF], [H2] and [F2] represent equilibrium concentration of HF, H2 and F2.

 

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