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Calculate the concentration for the gases at equilibrium help please?Methane, ethyne,...

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jamie523 | Student, Grade 11 | eNotes Newbie

Posted April 28, 2011 at 2:58 PM via web

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Calculate the concentration for the gases at equilibrium help please?

Methane, ethyne, and hydrogen form the following equilibrium mixture.

2CH4(g) ⇄ C2H2(g) + 3H2(g)

While studying this reaction , a chemist introduced 0.64 mol of CH4(g) into 4.0 L sealed flask at 1700°C, what concentration should the chemist expect for the gases at equilibrium?

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ncchemist | eNotes Employee

Posted May 2, 2011 at 2:22 AM (Answer #1)

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We actually cannot calculate the amounts of the gasses at equilibrium because the equililbrium constant for the reaction is not given.  The equiilibrium constant tells us the ratio of amounts of products to reactants for a particular reaction under certain conditions.  Since the reaction does not go to completion (meaning the reactant methane is not completely consumed) we cannot know the amounts of the three gasses at equilibrium without this constant.

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