A `4%` solution of sucrose `C_(12)H_(22)O_(11)` is isotonic with `3%` solution of an unknown organic substance. Calculate the molecular mass of the unknown substance.

Explanation

To solve the problem of finding the molecular mass of the unknown organic substance that is isotonic with a 4% sucrose solution, we can follow these steps:

### Step 1: Understand the Concept of Isotonic Solutions
Isotonic solutions have the same osmotic pressure. This means that the concentrations of the solutes in both solutions will be equal when expressed in terms of molarity.

### Step 2: Calculate the Molarity of the Sucrose Solution
A 4% solution of sucrose means there are 4 grams of sucrose in 100 mL of solution.

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