Caffine has a molecular weight of 194 . If it contains 28.9% by mass of nitrogen. How many N atoms are there in one molecule of caffeine

Asked by Anil | 15th May, 2017, 12:40: PM

Expert 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

Answered by Vaibhav Chavan | 15th May, 2017, 12:56: PM