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If the mass percent of various elements ...

If the mass percent of various elements of a compound' is known, its empirical formula can be calculated What is mass percent? Give its mathematical expression

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Mass percentage of a component in a solution is the weight of that component-present in 100 g to the solution. Mass per cent =`"Mass of the solute"/"Mass of the solution "xx100`
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  15. How is molecular formula different from the empirical formula?

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