According to the equation for this chemical reaction, what does the 2 in front of 2ag tell us?

The numeric value '2' in front of 2Ag tell us that that there 2 atoms of silver or there are 2 moles of silver .

Explanation:

A numeric value stated in before the chemical symbol of an element or compound in a balanced chemical reaction is said to be its stoichiometric coefficient.

This coefficient tells about the involvement of number of atoms or molecules or moles of the chemical substance in a chemical reaction.

The numeric value '2' in front of 2Ag tell us that that there 2 atoms of silver or there are 2 moles of silver .