A `5%` solution of cane sugar is isotonic with `0.877%` solution of urea. Calculate the molecular mass of urea if the molecular mass of cane sugar is `342`.

Explanation

To solve the problem, we need to find the molecular mass of urea given that a 5% solution of cane sugar is isotonic with a 0.877% solution of urea. We know the molecular mass of cane sugar is 342 g/mol.

### Step-by-Step Solution:

1. **Understand the Isotonic Condition**:
- Two solutions are isotonic if they have the same osmotic pressure. This means that the concentrations of solute particles in both solutions are equal.

2. **Define the Concentration**:
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