For the following redox reaction, balance the chemical equation, and determine the number of grams of MgO that are needed to produce 3.33 g of Fe2O3.
_____ MgO (s) + _____ Fe (s) → _____ Fe2O3 (s) + _____ Mg (s)
(i) 7.57 g
(ii) 2.52 g
(iii) 0.841 g
(iv) 0.312 g
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