Using Chemical Formulas:Examples
If a sample of a metal oxide weighs 137.91 g and was obtained by reacting 89.91 g of metal, what is the percentage composition of the metal oxide?
How accurately must you measure the percentage of carbon in a drug sample to distinguish between cocaine (C17H21O4N) and aspirin (C9H8O4)?
Vitamin B12 is 4.34% Co. If there is only one atom of Co per molecule of vitamin, what is the molecular weight of the vitamin?