RoseMarie Gallagher and Paul Ingram Solutions for Chapter: Using Moles, Exercise 7: Q

In the ionic compound magnesium chloride, magnesium and chlorine atoms combine in the ratio $1:2$. What is the formula of magnesium chloride?

In the ionic compound aluminium fluoride, aluminium and fluorine atoms combine in the ratio $1:3$. What is the formula of aluminium fluoride?

What is the difference between an empirical formula and a molecular formula? Can they ever be the same?

What is the empirical formula for benzene $\left({\mathrm{C}}_6{\mathrm{H}}_6\right)$?

A compound has the empirical formula ${\mathrm{CH}}_2$. Its ${\mathrm{M}}_{\mathrm{r}}$ is $28$. What is its molecular formula?

A hydrocarbon is $84 \%$ carbon, by mass. Its relative molecular mass is $100$. Find its empirical formula and molecular formula.

An oxide of phosphorus has an ${\mathrm{M}}_{\mathrm{r}}$ value of $220$. It is $56.4 \%$ phosphorus. Find its molecular formula.