Question

Molecular weight of a compound containing 15%be by mass is 2700u.The number of be atoms present in one molecule of compound is

Answer 1

Answer:

Molar mass of caffeine = 194u

N present in one molecule of caffeine = 28.9 % of 194 = 28.9/100 x 194 = 56u

Mass of one N atom = 14u

Hence 14u = 1N atom

56u = 56/14 N atom = 4N atom