0.197g of magnesium is burned in air

Question

2Mg + O2 ---> 2MgO
However, some of the magnesium reacts with nitrogen in the air to form Magnesium nitride instead : 3Mg + N2 --->Mg3N2
So you have a mixture of MgO and Mg3N2 weighing 0.315g.Determine what percentage of the Mg formed the nitride in the initial reaction.

Answer 1

Again, look at your MO2/M2S3 problem.

Answer 2

21.5%

Answer 3

45%