Problem
Atomic masses: Ba = 137 C = 12 O = 16 N = 14 H = 1
I. A white powder used in paints, enamels, and ceramics has the following percentage composition: Ba = 69.6%; C = 6.09% and O = 24.3%. (i) What is its empirical formula and (ii) What is the name of this compound?
II. Determine the (i) empirical formula and (ii) molecular formula of caffeine, a stimulant found in coffee, that contains 49.5%C, 5.15% H, 28.9% N, and 16.5% O by mass and has a molar mass of 195 g/mol.
III. Ibuprofen, a headache remedy, contains 75.69% C, 8.80% H, and 15.51 % O by mass, and has a molar mass of 206 g/mol. Determine the (i) empirical formula and (ii) molecular formula.