If the conversion of 77.0% pure ferric oxide to iron and oxygen is 85.0% efficient,

If the conversion of 77.0% pure ferric oxide to iron and oxygen is 85.0% efficient,

, what mass of this ferric oxide is required to make 4.00 moles of iron?

	A.	487 g
	B.	490 g
	C.	515 g
	D.	488 g
	E.	500 g

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