Question

1g of magnesium is burnt with 0.56g o2 in a closed vessel which reactant is left in the excess and how much?

Answer 1

first of all that oxygen you cannot store in any vessel so this 0.56g of o2 is wrong only magnesium will mix and burn in the air and form magnesium oxide (MgO)

Answer 2

Answer-

2Mg+ O2 → 2MgO

 2 moles of Mg Reacts with 1 mole of O2 to produce 2 moles of MgO.

- Moles= Mass/ Molar mass

Mg= 1/ 24= 0.0416

O= 0.56/ 32 =0.0175

mole ratio of Mg : O2 = 2: 1

  2 mole of Mg reacts with 1 moles of O2

if 1=2

Then 0.0175= 2× 0.0175

= 0.035 Moles of Magnesium