You need 5.00 grams of AgNO3. You have a 1.25 molar solution. What volume of that solution contains 5.00 grams?
The molecular weight of AgNO3 is 108 +14 +48 = 170 g/mole. 5.00 grams is
5/170 = 0.0294 moles of AgNO3.
How many liters of solution do you need if there are 1.25 moles of solute per liter?
V = 0.0294 moles/1.25 mole/l = ___ l
Convert to milliters of you wish