Question

Lithium and nitrogen react in a combination reaction to produce lithium nitride:6Li (s) + N2 (g) â 2Li3N (s)In a particular experiment, 4.50-g samples of each reagent are reacted. The theoretical yield of lithium nitride is ________ g.Lithium and nitrogen react in a combination reaction to produce lithium nitride:6Li (s) + N2 (g) 2Li3N (s)In a particular experiment, 4.50-g samples of each reagent are reacted. The theoretical yield of lithium nitride is ________ g.A) 3.76B) 22.6C) 4.53D) 7.52E) 11.2

Answer 1

The answer to your question is letter D

Step-by-step explanation:

Data

mass of Li = 4.5 g

mass of N₂ = 4.5 g

limiting reactant = ?

Reaction

6Li (s) + N₂ (g) ⇒ 2Li₃N

This reaction is balanced

Process

1.- Calculate the molecular mass of the reactants

Li = 7 x 6 = 42g

N = 14 x 2 = 28 g

Calculate the limiting reactant using proportions

Theoretical proportion Li / N = 42 / 28 = 1.5

Experimental proportion Li/N = 4.5/4.5 = 1

As the experimental proportion was lower than the theoretical, the limiting reactant is Lithium

2.- Calculate the theoretical yield of Li₃N

42 g of lithium -------------- 70 g of Li₃N

4.5 g of lithium ------------- x

x = (4.5 x 70) / 42

x = 315 / 42

x = 7.5 %