J.R. S. answered 02/25/19
Tutor
5.0
(145)
Ph.D. University Professor with 10+ years Tutoring Experience
The salt referred to is AgNO3. It has 2 moles of H2O of hydration. AgNO3-2H2O
molar mass AgNO3-2H2O = 206 g/mole
molar mass AgNO3 = 170 g/mole
% AgNO3 = 170/206 (x100%) = 82.5%