Question

How much magnesium must be burnt in oxyzen to obtain 1 kg of magnesium oxide

Answer 1

Hey Friend,

The reaction is as follows -

2Mg + O2 ---> 2MgO
2 vols + 1 vol ---> 2 vols

MgO formed is 1 kg (given)
2 volumes of Mg form 2 volumes of MgO
1 volume = 0.5 kg

Hence, 1 kg of Mg is burnt in 0.5 kg oxygen to give 1 kg of MgO

Hope it helps!