Question

Diatomic O2 can react with the element magnesium to form magnesium oxide (MgO). The balanced chemical equation is: O2 + 2 Mg → 2 MgO
If 4 moles of magnesium totally reacted with more than enough O2, how many moles of MgO would be expected to form?

Answer 1

Solution.

$4mol$ $x mol$

$O_2+2Mg\to 2MgO;$

$2$ $2$

We make the proportion: $\dfrac{4mol}{2}=\dfrac{xmol}{2};$

$x=\dfrac{4mol\sdot2}{2}=4mol;$

$\nu(MgO)=4mol$ ;

Answer: $\nu(MgO)=4mol.$