Mole ConceptMedium
Question
What is the mole fraction of water in 10% by weight (w/w) of aqueous urea solution ?
[Given : Molar mass of H, O, C and N are 1, 16, 12 and 14 g mol⁻¹ respectively]
Options
A.0.825
B.0.032
C.0.867
D.0.967
Solution
Sol. Mass ratio = mol ratio × GMM ratio
10/90 = n/N × 60/18
n/N = 1/30
xH₂O = W/(n + N) = 30/31 = 0.967
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