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All mass percent composition questions should provide you with information adding up to 100 or should give you a solution that is equal to 100. If not there is either in error in the question or the method used to solve.
For mass percent composition problems, if percentages are given to each element, the elements' percentages should all add up to 100%. However, if the masses, or grams, of each element are given, then the masses of the reactants should be equal to the masses of the products. You then convert the masses by dividing the given mass of each element from the total mass in order to find the mass percentage composition of each element, which should then add up to 100%.
It should add up to 100% since mass can not be created nor destroyed and what mass percent composition is stating is just how much the particular element weighs in the whole compound, or it is a percentage of the total mass and so percentages should always add up to 100%.
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