Question

0.197g of magnesium is burned in air
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.

Again, look at your MO2/M2S3 problem.
21.5%
45%

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