Sometimes athletes take drugs to enhance their performance. One such drug is ephedrine which has the formula C H NO. What is the molecular mass of ephedrine?

Amphetamine, another drug, has the formula C H N. The molecular mass is 135 amu. Calculate the percentage by mass of hydrogen in amphetamine.

A substance used as a cosmetic by the Ancient Egyptians has been analyzed. It was found to contain 76% lead, 13% chlorine, 2.2% carbon and 8.8% oxygen. Calculate the empirical formula of this compound.

Some toothpastes contain sodium fluoride. This compound has the formula NaF. Calculate the relative formula mass of this compound.

Calculate the % by mass of fluorine in sodium fluoride.

A tube of toothpaste contains 1.5 g of sodium fluoride. Calculate the mass of sodium in this tube of toothpaste.

Calcium hypochlorite tablets are added to swimming pools to kill microorganisms. The formula of calcium hypochlorite is CaCl O . Calculate the relative formula mass of calcium hypochlorite.

Calculate the percentage by mass of oxygen in calcium hyopchlorite.

Calculate the mass of oxygen in a 50g tablet of calcium hypochlorite.

Car airbags inflate when an impact causes a mixture of chemicals to react. The mixture of chemicals contains sodium azide (NaN ) which undergoes thermal decomposition to produce sodium and nitrogen. Calculate the mass of sodium that would be produced when 170 g of sodium azide decomposes.