Calculate the mass of urea required in making 2.5

Asked by admin @ 12/08/2021 in Science viewed by 315 People

Calculate the mass of Urea required in making 2.5 kg of 0.25 molal aqueous solution

Answered by admin @ 12/08/2021

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 i.e,

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

15×2500/1000+15 g

Therefore, 2.5 kg (2500 g) of solution contains = 15×2500/1000+15 = 36.946 g = 37 g of urea (approximately) Hence, mass of urea required = 37 g

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