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When writing a chemical equation?

April 26, 2017chemical Chemistry equation Mathematics writing

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When writing a chemical equation?

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Fe2O3(s) + 3H2SO4(aq) –> Fe2(SO4)3(aq) + 3H2O(l) You need to know about oxidation numbers for both elements and polyatomic ions. The oxidation number is not an electrical charge, it is more like the “combining power” of an element or polyatomic ion. You must know that the sum of the oxidation numbers for an element must always equal zero. So, when writing the formula we adjust the subscripts so that when they are multiplied by the oxidation numbers, the sum will equal zero. Fe2O3 You are told that iron will have an oxidation number of +3. That’s what the (III) tells us. We also know that oxygen always exhibits an oxidation number of -2.