At a particular moment

CHEMISTRY · Subjective · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)

Problem

At a particular moment, the following concentrations are measured for the reaction Fe3+(aq)+SCN−(aq)⇌FeSCN2+(aq)\text{Fe}^{3+}(aq) + \text{SCN}^-(aq) \rightleftharpoons \text{FeSCN}^{2+}(aq): [Fe3+]=0.20 M[\text{Fe}^{3+}] = 0.20\,\text{M}, [SCN−]=0.10 M[\text{SCN}^-] = 0.10\,\text{M}, and [FeSCN2+]=0.050 M[\text{FeSCN}^{2+}] = 0.050\,\text{M}. Calculate the value of the reaction quotient QcQ_c at this moment.

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