JEE Mains · Chemistry · STD 11 - 1. Some basic concept of chemistry
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.]
- A \(0.825\)
- B \(0.032\)
- C \(0.867\)
- D \(0.967\)
Answer & Solution
Correct Answer
(D) \(0.967\)
Step-by-step Solution
Detailed explanation
\(10\%\) w/w aqueous urea solution means \(10\) g of urea is present in \(100\) g of solution. Mass of urea \(= 10\) g Mass of water \(= 100 - 10 = 90\) g Molar mass of urea (\(\text{NH}_2\text{CONH}_2\)) \(= 14 + 2 + 12 + 16 + 14 + 2 = 60\) g mol\(^{-1}\) Molar mass of water…
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