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Question

The empirical formula of a compound is C2H5, and its molecular weight is 58, then its molecular formula is __________.


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Solution

  • The empirical formula represents the simplest form of formula which expresses the relative numbers of atoms in the compound.
  • The molecular formula denotes the actual number of atoms of different elements present.

Molecular formula = n× Empirical formula, where n=MolecularformulaweightEmpiricalformulaweight

Given molecular weight = 58g

The empirical formula weight of C2H5= 2×12 +1×5=29 g

Therefore n = 5829=2 ,

Molecular formula = 2(C2H5)= C4H10

Hence, the empirical formula of a compound is C2H5, and its molecular weight is 58, then its molecular formula is C4H10.


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