Ozone is made of oxygen. what is the formula of ozone if 36g occupies 16.8l at stp?

Mercury metal is poured into a graduated cylinder that holds exactly 22.5 ml the mercury used to fill the cylinder mass in 306.0 g from this information calculate the density of mercury

Once similarity and one difference between a mixture of elements and a mixture of compounds

How many atoms are in 2 moles of phosphorus