0.80g of impure (NH4)2SO4 (mohr's salt) was boiled with 100 mL of 0.2N NaOH solution till all the NH3 gas evolved. The remaining solution was diluted to 250 mL. 25 mL of this solution was neutralized using 5mL of 0.2N H2SO4 solution. What is the percentage purity of the sample?
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