The molar mass of $\mathrm{K}{}_2\mathrm{Cr}{}_2\mathrm{O}{}_7$ is $294\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$. Its equivalent mass when it oxidises in acidic medium (to $\mathrm{Cr}{}^{3+}$) is:

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