Explain how many coulombs of charge are required

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How many coulombs of charge are required to cause reduction of 0.20 mole of Cr3+ to Cr? A. 0.60C B. 3.0C C. 2.9×104 C D. 5.8×104 C E. 9.65×104 C an explanation please

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Explain how many coulombs of charge are required : How many coulombs of charge are required to cause reduction of 0.20 mole of Cr3+ to Cr? A. 0.60C B. 3.0C C. 2.9×104 C D. 5.8×104 C E. 9.65×104 C an explanation please
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