Question

Calculate the no of mole of o2 require to produce 240g of mgo by burning mg metal

Answer 1

2Mg+o2=2mgo
Molecular mass of mgo=24+16=40g
No:of moles of mgo=240/40= 6 moles of mgo are there in 240g
For 2 moles of mgo 1 mole of o2 is required.i.e for 6 moles of mgo 3 moles of o2 is required.