What amperage is required to plate out 0.315 mol Cr from a Cr3+ solution in a period of 9.00 hr?

im writing the conversions and i started with 9hr -> seconds but where do i go from the seconds to the moles of Cr? i know that we have to use for every mole of Cr there are 3 moles of e- but how do i put that in??

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