1g of Mg is burnt in a vessel containing "0.5g" of \(O_{2}\) .The reactant remaining un-reacted is?

1g of Mg is burnt in a closed vessel which contains 0.5g of O_(2) (i) Which reactants is left in excess (ii) Find the mass of the excess reactant.

A bulb contains 1.6 g of O_(2) contains.

1.0 g of Mg is burnt with 0.28 g of O_2 in a closed vessel . Which reactant is left in excess and how much ?