* Water molecules add weight: Wet AgCl contains water molecules adsorbed onto its surface. This extra weight is not part of the actual AgCl, but it is included in the measured mass.
* Higher apparent AgCl mass: The presence of water makes the measured mass of AgCl appear higher than it actually is.
* Overestimation of silver: Since the calculated percentage of silver is based on the mass of AgCl, a higher apparent mass of AgCl leads to an overestimation of the silver content in the alloy.
In summary: The water molecules contribute to the mass, but not to the actual amount of silver. This results in an inflated measurement, leading to a falsely high calculated percentage of silver in the alloy.
