`20g` of impure `NACI` smaple is added aqueous solution having excess `AGNO_(3)AgCI` precipitate is filtered
[Atomic mass `Ag = 108, CI = 35.5]` .

Explanation

To determine the percentage purity of the impure NaCl sample, we will follow these steps:

### Step 1: Write the reaction
The reaction between sodium chloride (NaCl) and silver nitrate (AgNO3) can be represented as:
\[ \text{NaCl} + \text{AgNO}_3 \rightarrow \text{AgCl} + \text{NaNO}_3 \]

### Step 2: Calculate the molar mass of AgCl
The molar mass of AgCl can be calculated using the atomic masses:
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