Magnesium and nitrogen react in a combination reaction to produce magnesium nitride: 3 Mg + N₂ → Mg₃N₂
In a particular experiment, a 10.1-g sample of N₂ reacts completely. The mass of Mg consumed is __________ g.

Question

Quizplus · Accepted Answer

The balanced chemical equation shows that 3 moles of Mg react with 1 mole of N2. The molar mass of Mg is 24.31 g/mol, and the molar mass of N2 is 28.01 g/mol. Therefore, 28.01 g of N2 react with 3 * 24.31 g = 72.93 g of Mg. Since 10.1 g of N2 reacts, the mass of Mg consumed is 10.1 g * 72.93 g / 28.01 g = 26.3 g.

Magnesium and Nitrogen React in a Combination Reaction to Produce