1.5 mol of O2 combines with Mg to form oxide MgO. The mass of Mg (at. mass 24) that has combined is

Question

1.5 mol of O2 combines with Mg to form oxide MgO. The mass of Mg (at. mass 24) that has combined is (A) 72 g (B) 36 g (C) 48 g (D) 24 g

Tardigrade Admin · Accepted Answer

underset1 moleMg + underset0.5 mole(1/2) O2 → MgO 0.5 mole of oxygen react with 1 mole of Mg 1.5 mole of oxygen react with (1.5/0.5) = 3 mole 24× 3 = 72 g.

Q. $1.5$ mol of $O_{2}$ combines with $M g$ to form oxide $M g O$ . The mass of $M g$ (at. mass $24$ ) that has combined is

$72 g$

$36 g$

$48 g$

$24 g$

$1 m o l e M g + 0.5 m o l e \frac{1}{2} O_{2} \to M g O$
$0.5$ mole of oxygen react with $1$ mole of $M g$
$1.5$ mole of oxygen react with $\frac{1.5}{0.5} = 3$ mole
$24 \times 3 = 72 g$ .

Q. 1.5 mol of O2​ combines with Mg to form oxide MgO. The mass of Mg (at. mass 24) that has combined is

72g

36g

48g

24g