Question

If 12 mol of lithium were reacted with excess nitrogen gas, how many moles of lithium nitride would be produced?

Answer 1

Answer: 4 moles

Explanation:

$6Li+N_2\rightarrow 2Li_3N$

From the balanced chemical equation, it can be seen that 6 moles of lithium react with 1 mole of nitrogen to give 2 moles of lithium nitride.

Now as nitrogen is in excess, lithium is the limiting reagent as it limits the formation of products.

As 6 moles of lithium produce 2 moles of lithium nitride.

12 moles of lithium will produce=$\frac{2}{6}\times 12=4moles$ of lithium nitride.

Answer 2

The balanced reaction that describes the reaction between lithium and nitrogen to produce lithium nitride is expressed N2 + 6Li = 2Li3N. Hence for 12 moles of lithium given, there are 4 moles of lithium nitride produced. Answer to this problem is 4 moles.