You can't do this? Look up the atomic mass of Ag on the periodic chart or get it from the web, add it to the atomis mass of N followed by 3 times the atomic mass of O. And, by the way, that name you gave AgNO3 is not an acceptable name by the International Union of Pure and Applied Chemistry (IUPAC), Silver nitrate is an acceptable name. Also you can google "molar mass AgNO3" and the web will calculate it for you. It's approximately 170.
