Besides its use in making black-and-white film, silver nitrate (AgNO3) is used similarly in forensic science. The NaCl left behind in the sweat of a fingerprint is treated with AgNO3 solution to form AgCl. The precipitate is developed to show the black-and-white fingerprint pattern. Given ΔHlattice of AgNO3 = 822 kJ/mol and ΔHhydr = −799 kJ/mol, calculate its ΔHsoln.