A solution containing 10 g per dm 3 of urea (molecular mass = 60 g mol -1 ) is isotonic with a 5% solution of a nonvolatile solute. The molecular mass of this nonvolatile solution is:

1. A. 250 g mol -1
2. B. 300 g mol -1
3. C. 350 g mol -1
4. D. 200 g mol -1

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