Epinephrine (adrenaline) is 59.0 carbon 7.1 hydrogen 26.2 oxygen and 7.7 nitrogen by mass. What is the empirical formula of epinephrine if its molar mass is 180 gmol?

Answer 1

moles C: 59.0 x 1 mol/12 g = 4.92 moles C
moles H: 7.1 x 1 mol/1 g = 7.1 moles H
molesO: 26.2 x 1 mol/16 g = 1.64 moles O
moles N: 7.7 x 1 mol/14 g = 0.55 moles N
Divide through by smallest( 0.55) to get:
C = 8.9
H = 12.9
O = 2.98
N = 1
Empirical formual = C9H13O3N with a mass of 183
C9H13NO3 <==ANSWER