Question

What is the molecular weight of a substance, each molecule of which contains `9` carbon atoms, `13` hydrogen atoms and `2.33 xx 10^(-23) g` of other component ?

Answer 1

The molecule has `C, H` and other component.
w.t of `9 C` atoms `=12xx9 =108` amu
w.t of `13 H` atoms `=13xx1= 13` amu
w.t of other component `=(2.33xx10^(-23))/(1.66xx10^(-24))= 14.04` amu
`:.` Total weight of one molecule `= 108+13+14.04`
`=135.04` amu
`:.` Mol.wt. of substance `= 135.04`