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How many moles of OH^(-) are present in ...

How many moles of `OH^(-)` are present in the balanced equation?
`Cr(OH)_(3)+H_(2)O_(2)overset(OH^(-))rarr H_(2)O+CrO_(4)^(-2)`

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The balanced equation is
`2Cr(OH)_(3)+H_(2)O_(2)+4OH^(-)rarr 2CrO_(4)^(-2)+8H_(2)O`
Number of moles of hydroxyl `(OH^(-))` required in the balanced equation = 4
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