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Reaction Quotient

What concentr...

Question

What concentration of CO 2 be in equilibrium with 0.025 M CO at $120^{o} C$ for the reaction
$F e O (s) + C O (g) ⇌ F e (s) + C O_{2} (g)$ if the value of $K_{c} = 5.0$ ?

A

0.125 M

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B

0.0125 M

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C

1.25 M

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D

12.5 M

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Solution

The correct option is A 0.125 M
$F e O (s) - s o l i d + C O (g) 0.025 ⇌ F e (s) - s o l i d + C O_{2} (g) x$
$K_{c} = [\frac{C O_{2} (g)}{C O (g)}] = \frac{x}{0.025} = 5.0 (G i v e n)$
$∴ x = 0.125 M$
$[C O_{2}] = 0.125 M$

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