Question

one gram of magensium is burnt in a closed vessel which contains 0.5 grams of oxygen.
which is limiting reactant?
what is the amount of mgo formed ?

Answer 1

2Mg+O2>>2MgO

so how many moles of Mg do you have?

moles Mg=1/24.3

then according to the balanced equation, you need 1/2 * 1/24.3 moles O2. WHat is the mass of that? 1/2*1/24.3*32 grams, which in my head is more than .5 grams, so you are limited by the O2.

Answer 2

10 g of mg is burnt in a closed vessel which contains 0.5 g of o2 . Which is the limiting reactant and what is the amount of mgo formed in the reaction