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Question

Urea [CO(NH2)2] is an important nitrogenous fertilizer and is sold in 50 kg sacks. What is the mass of nitrogen in one sack of urea?

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Solution

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

Chemical Formula of the Urea = [CO(NH2)2]
The molecular mass of the Urea = 60 g/mole.
Mass of the Nitrogen in 1 mole of the Urea = 14 × 2 = 28 g.

∵ 60 g of the urea contains 28 g of the N.
∴ 1 g of the urea contains 2860 g of the N.
∴ 50000 g of the urea contains 28 over 60 cross times 50000 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.


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