Question

calculate the mass of Urea(NH2CONH2) required in making 2.5 kg of 0.25 molal aqueous solution​

Answer 1

no. of moles=given mass/molecular mass

0.25=2.5/x

x=2.5/0.25

x=10g

hope it helps you!!!

Answer 2

_/\_Hello mate__here is your answer--

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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× 2500)/( 1000+ 15 )

=36.95 g

= 37 g of urea (approximately)

Hence, mass of urea required = 37 g

I hope, this will help you.☺

Thank you______❤

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