A substance forms dimers in solution to the extent of 75%. Calculate van't Hoff Factor.

Explanation

To calculate the van't Hoff factor (i) for a substance that forms dimers in solution to the extent of 75%, we can follow these steps:

### Step 1: Understand the Reaction
The substance forms dimers, which means that two moles of the substance (A) combine to form one dimer (A2). This can be represented as:
\[ 2A \rightarrow A_2 \]

### Step 2: Define the Degree of Association
The extent of dimer formation is given as 75%. This means that 75% of the original substance associates to form dimers. We denote this degree of association as \( \alpha \):
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