Question

Calculate the mass of urea required in making 2.5

Answer 1

Answer:

37 g

Explanation:

Molar mass of urea (NH2CONH2) = 2 (1 × 14 + 2 × 1) + 1 × 12 + 1 × 16

= 60 g mol - 1

0.25 molar aqueous solution of urea means:

1000 g of water contains 0.25 mol = (0.25 × 60)g of urea

= 15 g of urea

That is (1000 + 15) g of solution contains 15 g of urea

Therefore, 2.5 kg (2500 g) of solution contains =  (15 X 2500) / (1000+15) g

= 36.95 g

= 37 g of urea (approximately)

Mass of urea required = 37 g

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