![]() The percent composition tells you how much of each element is present:īecause it is convenient. Start the problem with the assumption that you have 100.0 g of sample. ![]() ![]() to moles.Why a conversion to moles? Because that is what a formula is, aformula relates moles of one element to moles of another element. The problem is really just a conversion from % by wt. The result of an elemental analysis is alwaysreported as a percent mass of each of the elements for which theanalysis was performed.Īn elemental analysis of a white crystalline compound believed tobe C 6H 12O 6, analyzed for C, H and Ogave the following results.Ĭ = 40.00 %, H = 6.71 %, O = 53.28 % by wt. When an elemental analysis is performed we do not get themolecular formula.
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