[* تركي *]

moles = Molarity * liter = 0.2450 * 0.025 = 0.006125 moles of chloride ion in NH4Cl

moles = Molarity * liter = 0.1655 * 0.0555 = 0.00918525 moles of FeCl3

moles of chloride ion in FeCl3 = 0.00918525 * 3 = 0.02755

Total moles of chloride ion in the solution = 0.02755 + 0.006125 = 0.0336

Total volume = 0.0555 + 0.025 = 0.0805 L

Molarity = Moles / liters = 0.0336/0.0805 = 0.418 M