What is the molar mass of a substance, each molecule of which contains 9 carbon atoms, 13  hydrogen atoms and  $2.33\times {10}^{-23}g$ of other component?

Mass of other atom in a molecule  $=2.33\times {10}^{-23}g$
Mass of other atom  $=\frac{2.33\times {10}^{-23}g}{1.66\times {10}^{-24}}=14.04u$
Mass of C-atom in a molecule  $=9\times 12=108u$
Mass of H-atom in a molecule  $=13\times 1=13u$
  Total mass of one molecule  $=14.04+108+13=135.04u$
Molar mass of molecule  $=135.04\times 6.023\times {10}^{23}\times 1.66\times {10}^{-24}$
   $=135.04g/mol$