When the following equation is balanced with the lowest whole number coefficients possible, what is the coefficient in front of ca3(po4)2?

This should be the answer you are looking for 1 Ca3(PO4)2

Since there is the same amount of agn03 in both silver chloride and silver nitrate they produce the same amount of moles. therefore silver chloride produces the same amount of silver nitrate, so your answer is 15.0 moles of silver nitrate. i hope this !