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Calculate the mass of urea (NH2CONH2) re...

Calculate the mass of urea `(NH_2CONH_2)` required in making 2.5 kg of 0.25 molal aqueous solution.

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2.5 Kg of 0.25 m aqueous solution contains urea
=`0.25xx2.5`moles= 0.625 moles
= `0.625xx60`g= 37.g (Molar mass of urea=60)
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