# What is the molar mass of copper (ll) sulfate?

$C u S {O}_{4}$ is composed of $C u$, $63.55 \cdot g \cdot m o {l}^{-} 1$, $S$, $32.06 \cdot g \cdot m o {l}^{-} 1$, and oxygen $4 \times 15.999 \cdot g \cdot m o {l}^{-} 1$. So what is its molar mass?
The dissolution of white, anhydrous $C u S {O}_{4}$ in water is a truly beautiful chemical reaction. Beautiful, macroscopic crystals of $C u S {O}_{4} \cdot 5 {H}_{2} O$ can be grown whose colour is truly magnificent.