90.8 litres of a mixture of nitrogen and hydrogen measured at STP were passed over a catalyst. After the reaction, the volume of the mixture reduced to 68.1 litres. Ammonia thus formed was dissolved in 101 ml of an aqueous ammonia solution of density of 0.85 g//ml containing `12%` by mass of `NH_(4)OH.` Determine the percent weight strength of the final solution.
[Give answer exculding decimal places]
