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18 September, 11:29

Hydrogen and chlorine react to form hydrogen chloride, like this:

H2 (g) + Cl2 (g) → 2 HCl (g)

Also, a chemist finds that at a certain temperature the equilibrium mixture of hydrogen, chlorine, and hydrogen chloride has the following composition:

compound pressure at equilibrium

HCl 18.0 atm

H2 25.4 atm

Cl2 46.4 atm

Calculate the value of the equilibrium constant Kp for this reaction. Round your answer to significant digits.

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Answers (1)
  1. 18 September, 11:52
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    the value of the equilibrium constant Kp for this reaction is 0.275

    Explanation:

    Step 1: Data given

    Pressure HCl at the equilibrium = 18.0 atm

    Pressure H2 at the equilibrium = 25.4 atm

    Pressure Cl2 at the equilibrium = 46.4 atm

    Step 2: The balanced equation

    H2 (g) + Cl2 (g) → 2 HCl (g)

    Step 3: Calculate the value of the equilibrium constant Kp for this reaction

    Kp = (pHCl) ² / (pH2*pCl2)

    Kp = 18.0² / (25.4 * 46.4)

    Kp = 324 / 1178.56

    Kp = 0.275

    the value of the equilibrium constant Kp for this reaction is 0.275
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