What is the frequency of ultraviolet light with wavelength 2.94X10-8 m? (c = 3.00X108 m/s)

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Ответ:

taleiayarbough2940

17.01.2020

Chemistry

$[A]_{eq}=0.095M$

Explanation:

Hello,

In this case, for the reaction:

$A+B\rightleftharpoons C+D$

It is clear that the equilibrium expression is:

$Kc=\frac{[C][D]}{[A][B]}$

Nevertheless, since the initial concentrations of both A and B are 0 M and C and D 1.6 M, we should invert the reaction:

$C+D\rightleftharpoons A+B$

Thereby the equilibrium expression is also inverted:

$Kc=\frac{[A][B]}{[C][D]}$

Which can be written in terms of the reaction extent and initial concentrations as shown below:

$\frac{1}{Kc} =\frac{x*x}{([C]_0-x)([D]_0-x)}\\\\\frac{1}{0.47}= \frac{x*x}{(1.6-x)(1.6-x)}$

Hence, solving for we obtain:

x=0.095M

In such a way, the equilibrium concentration of A is:

$[A]_{eq}=x=0.095M$

Best regards.

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