Introducing chemical reactions

Easy

What is the relative formula mass of aluminium sulfate, $Al2(SO4)3\text{Al}_2(\text{SO}_4)_3$ ?

Relative atomic mass ( $ArA_{\text{r}}$ ): $Al=27.0\text{Al} = 27.0$ $S=32.1\text{S} = 32.1$ $O=16.0\text{O} = 16.0$

$214.3$

$278.1$

$315.3$

$342.3$

Introducing chemical reactions Questions