Question

1.2g of Mg (At mass 24) will produce MgO equal to

Answer 1

1.2g of Mg is 1.2/24=0.05 moles of Mg. As per the stoichiometric equation, Mg+0.5O2=MgO, one mole of Mg produces one mole of MgO. Which means, 0.05 moles of MgO are produced. The molar mass of MgO=24+16=40. So, the total mass obtained =40*0.05=2g.

Answer 2

2 grams or 0.05 mol

Explanation:

2Mg+O2 gives 2Mgo

48 gm+32 gm gives 80 gm

1.2 gm Mg gives 80/48*1.2=2 gm of MgO

Also,1.2/24=0.05 mols of MgO.