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10 February, 20:59

Calculate the value of [N2]eq if [H2]eq = 2.0 M, [NH3]eq = 0.5 M, and Kc = 2. N2 (g) + 3 H2 (g) ↔ 2 NH3 (g) 0.062 M62.5 M0.40 M0.016 M0.031 M

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  1. 10 February, 21:10
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    [ N₂ (g) ] = 0.016 M

    Explanation:

    N₂ (g) + 3 H₂ (g) ↔ 2 NH₃ (g)

    The equilibrium constant for the above reaction, can be written as the product of the concentration of product raised to the power of stoichiometric coefficients in a balanced equation of dissociation divided by the product of the concentration of reactant raised to the power of stoichiometric coefficients in the balanced equation of dissociation.

    Hence,

    Kc = [ NH₃ (g) ]² / [ N₂ (g) ] [ H₂ (g) ]³

    From the question,

    [ NH₃ (g) ] = 0.5 M

    [ N₂ (g) ] = ?

    [ H₂ (g) ] = 2.0 M

    Kc = 2

    Now, putting it in the above equation,

    Kc = [ NH₃ (g) ]² / [ N₂ (g) ] [ H₂ (g) ]³

    2 = [ 0.5 M ]² / [ N₂ (g) ] [ 2.0 M ]³

    [ N₂ (g) ] = 0.016 M.
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