Does anyone know this?

1.24 moles

Explanation:

first find the molar mass of AgNO3, which I got 169.877

then, divide the number of moles used by the Molar mas

210/169.877 = 1.2361 = 1.24

Since, the molar ratios of AgNO3 and Ag are the same (2:2), the answer will be 1.24

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

elements make up everything, and they combine to make compounds.

the answer is c