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Problem: When 0.2250 g of magnesium is heated with 0.5331 g of nitrogen in a closed container, the magnesium is completely converted to 0.3114 g of magnesium nitride. What mass of unreacted nitrogen must remain?

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First is to write the balanced equation where Mg (s) and nitrogen gas, N2 (g) produces magnesium nitride Mg3N2 (magnesium ion is Mg2+ and nitride ion is N3-). Unbalanced reaction will appear as:

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When 0.2250 g of magnesium is heated with 0.5331 g of nitrogen in a closed container, the magnesium is completely converted to 0.3114 g of magnesium nitride. What mass of unreacted nitrogen must remain?


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