Question

please send me the answer....Caffine has a molecular weight 194.It contains 28.9%by mass of nitrogen.What is the number of atoms of nitrogen in one molecule of it?​

Answer 1

please send me the answer....Caffine has a molecular weight 194.It contains 28.9%by mass of nitrogen.What is the number of atoms of nitrogen in one molecule of it?

ans = 4

Answer 2

molecular weight is 194,which means ,mass of one moles of molecule of caffeine in 194g

mass of nitrogen in one mole of molecule=28.9/100 ×194

=56.06 or 56(approx)

moles of atom of nitrogen in 1 mole caffine=56/14=4=4×6×10^23atoms

so,in 1 molecule=4×6×10^23/6×10^23

=4