1.0g of magnesium is burnt with 0.56 g O₂ in a closed vessel

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)

Options

(a) Mg,0.16g
(b) O₂,0.16g
(c) Mg,0.44g
(d) O₂,0.28g

Correct Answer:

Mg,0.16g

Explanation:

Initially Mg +1/2 O₂→MgO (or)
1/24 mole 0.56/32 mole
0.0416 mole 0.0175 mole
(0.0416-2 ×0.0175) (2 ×0.0175) mole
=0.0066 mole
mass of Mg=0.0066 ×24
=0.158 ≈ 0.16g

admin:

Related Questions

  1. The compound which contains all the four 1°,2°,3° and 4° carbon atoms is
  2. NO₂ is not obtained on heating
  3. For the cell reactionCu²⁺ (C₁.aq) + Zn(s) = Zn²⁺(C₂.aq ) + Cu(s)
  4. The work done during the expansion of a gas from a volume of 4 dm³ to 6 dm³
  5. A tertiary alcohol is obtained