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how to find the equivalent mass of redox reaction?

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Q. Which of the following correctly represents the equivalent mass in a redox change of reaction,

{(N H_{4})}_{2} C r_{2} O_{7} ⟶ N_{2} + C r_{2} O_{3} + 2 H_{2} O

?

Q. Consider a redox reaction:

F e S_{2} + K M n O_{4} + H^{+} \to F e^{3 +} + S O_{4}^{2 -} + M n^{2 +} + H_{2} O

.

If the molar mass of

F e S_{2}

is M, then equivalent mass of

F e S_{2}

would be equal to:

C r_{2} O_{7}^{2 -}^{+} C r^{3 +}

Find the equivalent weight of

C r_{2} O_{7}^{2 -}

in the above redox half reaction.
(Given the molar mass of

C r_{2} O_{7}^{2 -}

M g / m o l

)

Q. In a redox reaction, dichromate ion

({C r_{2} O_{7}}^{2 -})

C r^{3 +}

ion, the equivalent mass of

K_{2} C r_{2} O_{7}

in this reaction is:

C r_{2} O_{7}^{2 -}^{+} C r^{3 +}

Find the equivalent weight of

C r_{2} O_{7}^{2 -}

in the above redox half reaction.
(Given the molar mass of

C r_{2} O_{7}^{2 -}

M g / m o l

)

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