5. From a sample of technical ammonium sulfate weighing 1.6160 g, 250 cm3 of its aqueous solution were prepared. 25 cm3 of the resulting solution was boiled with an excess of concentrated NaOH solution. The released ammonia was absorbed by a 0.1020 N solution of H2SO4 with a volume of 40 cm3. For titration of excess sulfuric acid, 17.00 cm3 of 0.09690 N NaOH solution were used. What is the content of ammonia (in % by mass) in the original salt?

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