# Chemistry

Write equilibrium Constant expressions (k) for the following reactions:
Ni(s)+ 4CO(g) <-> Ni(CO)₄
HF(aq) <-> H(aq) + F(aq)

Cl₂(g)+2Br(aq) <-> Br₂(l) + 2Cl(aq)

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1. What do you not understand about how to write these expressions? It's just "follow the rules."

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2. when the element have different states, ie. (aq) (s) (g) etc. doesn't that change the way you write the constant expressions?

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posted by Aidan
3. Yes. As a general rule, solids and pure liquids don't show up in the expression.
Ni(s)+ 4CO(g) <-> Ni(CO)₄
HF(aq) <-> H(aq) + F(aq)

Cl₂(g)+2Br(aq) <-> Br₂(l) + 2Cl(aq)

So #2 is
K=(H^+)(F^-)/(HF) and the concn of each is determined by the molarity.
For #1, K = (CO)^4

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