368. A weighing of 0.7200 g of ammonium salt was treated with an excess of concentrated NaOH solution. The released ammonia was taken up with 25.00 ml of 0.2040 M HCl solution and the excess acid was titrated with 12.70 ml of 0.1030 M NaOH solution. Find the mass fraction (wt %) of NH3 in the sample.

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