Navigate

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

AIPMT2014
admin:

Related Questions

  1. Arsenic containing medicine used for the treatment of syphilis, is
  2. How many moles of iodine are liberated when 1 mole of potassium dichromate
  3. In the periodic table from left to right in a period,the atomic volume
  4. For which one of the following sets of four quantum numbers, an electron will have
  5. Using the Gibb’s energy change,ΔG⁰ = +63.3 kJ, for the following reaction