A silver nitrate primary standard for a gravimetric titration of chloride was prepared by dissolving 4.872 ± 0.003 g AgNO3 (FM 169.8731) in 498.633 ± 0.003 g H2O. Then 26.207 ± 0.003 g of the solution were weighed out for titration. Find the moles of Ag+ ( and its relative uncertainty) delivered for titration. The relative uncertainty in formula mass is negligible.