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The valancies of the constituent elements' chemical formula are same on every formula. But variable valancies are different for example if iron and sulpher have different valency how will I understand which valency I should use for finding out the formula

Answer» The valancies of the constituent elements' chemical formula are same on every formula. But variable valancies are different for example if iron and sulpher have different valency how will I understand which valency I should use for finding out the formula


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