Question

Urea $\left[CO\right(N{H}_2{)}_2]$ is an important nitrogenous fertilizer and is sold in 50 kg sacks. What is the mass of nitrogen in one sack of urea?

Answer 1

Mass of the Urea in one sac = 50 kg. = 50000 g.

Chemical Formula of the Urea = $\left[CO\right(N{H}_2{)}_2]$
The molecular mass of the Urea = 60 g/mole.
Mass of the Nitrogen in 1 mole of the Urea = 14 $\times$ 2 = 28 g.

∵ 60 g of the urea contains 28 g of the N.
∴ 1 g of the urea contains $\frac{28}{60}$ g of the N.
∴ 50000 g of the urea contains g of the N., ie 23333.33 g of the Nitrogen.


Hence, the mass of the Nitrogen in one sac of the urea is 23,333.33 grams or 23.33 kg.