Caffeine, a stimulant found in coffee and soda, has the mass percent composition: C, 49.48%; H, 5.19%; N, 28.85%; O, 16.48%. The molar mass of caffeine is 194.19 g/mol. Find the molecular formula of caffeine.
Mass percent composition of C = 49.48%
Mass percent composition of H = 5.19%
Mass percent composition of N = 28.85%
Mass percent composition of O = 16.48%
Molar mass of caffeine = 194.19 g/mol
Molecular formula of caffeine = ?
To find the molecular formula, we need to find the number of atoms.
number of moles (n) =
To find the mass of element here, we multiply the mass percent composition with the molar mass of caffeine.
Mass of carbon (C) =194.19 = 96.0852 g
Mass of hydrogen(H) =194.19 = 10.078 g
Mass of nitrogen(N) =194.19 = 56.023 g
Mass of oxygen(O) =194.19 = 32.00 g