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At a particular temperature the equilibrium constant for the reaction: H2(g) + F2(g) ⇔ 2HF(g) is...

At a particular temperature the equilibrium constant for the reaction:
H2(g) + F2(g) ⇔ 2HF(g)
is K = 64.0. A reaction mixture in a 10.00-L flask contains 0.43 moles each of hydrogen and fluorine gases plus 0.34 moles of HF. What will be the concentration of H2 when this mixture reaches equilibrium?

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