Question detail
In the reaction 3Mg + N2 → Mg3N2, calculate the mass of magnesium nitride produced when 12 g of magnesium is reacted. (Relative atomic masses: Mg = 24, N = 14)
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Use of amount of substance in relation to masses of pure substances
Question
In the reaction 3Mg + N2 → Mg3N2, calculate the mass of magnesium nitride produced when 12 g of magnesium is reacted. (Relative atomic masses: Mg = 24, N = 14)
Answer
28 g
Explanation
This question assesses the understanding of stoichiometry and mass calculations from a balanced equation. The student must convert the mass of magnesium to moles, use the mole ratio to find moles of magnesium nitride produced, and convert back to mass.
Common mistake
Confusing Reactants and Products
Students often confuse the masses of reactants with the masses of products when calculating from a balanced equation.
Carefully identify which substances are reactants and which are products in the balanced equation before performing calculations.
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