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Question
Urea [CO(NH2)2] is an important nitrogenous fertilizer. Urea is sold in 50 kg sacks. What mass of nitrogen is in one sack of urea?
Solution
Molecular mass of urea = 12 + 16+2(14+2) = 60g
60g of urea contains nitrogen = 28g
So, in 50g of urea, nitrogen present = `28/60 xx 50`
∴ 50 kg of urea contains nitrogen = 23.33 kg
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