NH3 gas is released as follows when 0.608 g of a (NH4)2 SO4 fertilizer sample is heated with excess aqueous NaOH. (NH)2SO + 2 NaOH Na2SO4 + 2 H₂O +2 NH3 Releasing NH3 gas is absorbed to 46.3 cm³ of 0.213 mol dm³ HCl solution. It was found that 44.3 cm³ of 0.128 mol dm³ NaOH solution was used to neutralize the excess acid. Find the nitrogen percentage of the fertilizer sample.