Question

1.0 g of magnesium is burnt with 0.56 g O₂ in a closed vessel. Which reactant is left in excess and how much? (At. wt. Mg = 24, O = 16)

(a) Mg, 0.16 g

(b) O₂,0.16 g

(c) Mg, 0.44 g

(d) O₂, 0.28 g

Answer 1

The correct option is : (a) Mg, 0.16 g

Explanation :

The balanced equation is

= 0.0066 moles (O₂ is limiting reagent.)

.^. .  Mass of Mg left in excess = 0.0066 x 24 = 0.16 g