Ammonia Buffer Preparation

Class XII students were asked to prepare one litre of buffer solution of pH‌8.26 by their Chemistry teacher: The amount of ammonium chloride to be dissolved by the student in 0.2M ammonia solution to make one litre of the buffer is
(Given: pKb(NH3)=4.74
Molar mass of NH3=17gmol−1
Molar mass of NH4‌Cl=53.5gmol−1 )