Question

Compute the mass percent of carbon, hydrogen, nitrogen, and oxygen in caffeine, C8H10N4O2

Answer 1

Molar mass of caffeine: 194

Carbon percentage: 12*8 / 194 = 49%

Hydrogen: 10 / 194 = 5%

Nitrogen: 14*4 / 194 = 29%

Oxygen: 16*2 / 194 = 16%

Answer 2

mass percentage of C = 49.48%
mass percentage of H =5.19%
mass percentage of N =28.86
mass percentage of O = 16.48