Chemistry - Mole Concept Question with Solution | TestHub

$\underset{\text{1}\text{mole}}{\text{Mg}}\text{+}\underset{\text{0}\text{.5}\text{mole}}{\frac{\text{1}}{\text{2}}{\text{O}}_{\text{2}}}\to \text{MgO}$
$0.5$$\mathrm{m}\mathrm{o}\mathrm{l}\mathrm{e}$of oxygen react with$\text{1}$mole of$\text{Mg}$
$1.5$$\mathrm{m}\mathrm{o}\mathrm{l}\mathrm{e}$of oxygen react with$\frac{1.5}{0.5}=3$mole
$24\times 3=72$$\mathrm{g}\mathrm{m}$.