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Chemistry

Determine the formula of the organic compound if it's molecule contains 12 atoms of carbon. The percentage compositions of hydrogen and oxygen are 6.48 and 51.42 respectively.

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Answer

Element% compositionAt. wt.Relative no. of atomsSimplest ratio
Oxygen51.421651.4216\dfrac{51.42 }{16} = 3.213.213.21\dfrac{3.21}{3.21} = 1
Hydrogen6.4816.481\dfrac{6.48}{1} = 6.486.483.21\dfrac{6.48}{3.21} = 2
Carbon42.11242.112\dfrac{42.1}{12} = 3.503.503.21\dfrac{3.50}{3.21} = 1

Simplest ratio of whole numbers = O : H : C = 1 : 2 : 1

Hence, empirical formula is CH2O

Since the compound has 12 atoms of carbon, so the formula is C12H24O12.

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