Answer
23. Given: quinine, C20H24N2O2
The given compound contains 20 mol C atoms, 24 mol H atoms, 2 mol N atoms and 2 mol O atoms. So,
Molar mass of quinine= (20 mol x 12 g C) + (24 mol x 1 g H) + (2 mol x 14 g N) + (2 mol x 16 g O) = 324 g/mol
Mass % of each component= (mass of component)/(total mass of compound) x 100
Mass % of C= (mass of Carbon)/(total mass of compound) x 100= 240/324 x 100 = 74.074 % C
Mass % of H= (mass of hydrogen)/(total mass of compound) x 100= 24/324 x 100 = 7.5 % H
Mass % of N= (mass of Nitrogen)/(total mass of compound) x 100= 28/324 x 100 = 8.641 % N
Mass % of C= (mass of Oxygen)/(total mass of compound) x 100= 32/324 x 100 = 9.876 % O
Work Step by Step
1. Find the molar mass of the given compound by adding masses of all the elements present in the compound.
2. Using formula for mass %,
mass %=mass of component/mass of compound x 100, find the mass % of each element.
