A newly discovered compound has been found to be 16.2% magnesium, 18.9% nitrogen, and 64% oxygen by weight. What is a possible formula for this compound?

Question

Quizplus · Accepted Answer

A possible formula for this compound is Mg(NO?)₂. Keeping in mind that the percentages are mass, and not mole percent, we quickly realize that oxygen must be the major compound. Thus, A and B are possible answers. D and E are not possible because there are 2 magnesium atoms in the molecule, and magnesium is heavier than oxygen. A is the only answer with nitrogen, and if we calculate the mass percent of this compound, it comes out to the percentages described in the question.

A Newly Discovered Compound Has Been Found to Be 16