Question

an organic compound containing carbon,hydrogen and oxygen gas gave the percentage composition-
1)carbon-40.687%
2)hydrogen-5.085%
the molecular mass of the compound is 118g. Calculate the empirical formula.

Answer 1

carbon=40.687%
hydrogen =5.085%
100 gram of the contains
40.68 g of carbon moles of carbon =3.39 moles of carbon
5.08 g of hydrogen moles hydrogen =5.08 moles of hydrogen
dividing the mole values by the smallest number that 3 and rounding off

Answer 2

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