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प्रश्न
A 10% aqueous solution of cane sugar (mol. wt. 342) is isotonic with 1.754% aqueous solution of urea. Find the molecular mass of urea.
संख्यात्मक
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उत्तर
10% aqueous solution of cane sugar is isotonic with 1.754% aqueous solution of urea (MB)
`(10 xx 1000)/(100 xx 342) = (1.754 xx 1000)/(100 xx M_B)`
`M_B = (1.754 xx 1000)/(100)`
= `(100 xx 342)/(10 xx 1000)`
= 1.754 × 34.2
= 59.99 ≈ 60
∴ The molecular mass of urea 60 g/mol.
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