Question

magnesium and oxygen combine in the ratio 3:2 by mass to give magnesium oxide.what mass of magnesium will combine with 16g of oxygen?

Answer 1

The mass of magnesium will be 24 g
3:2=X:16
or,2*x =3x16
or X=3x16/2
X=24

Answer 2

Answer:

One can use Law of Constant Proportion to solve this answer:

3:2=x:16

$\frac{3}{2}$ = $\frac{x}{16}$

2x=48

x=24g

Therefore,24g of Magnesium will be required.