HELP PLEASE

A metallurgist reacts 260.0 grams of 80.0% by mass silver nitrate solution with an excess of copper metal. How many grams of silver metal can the metallurgist produce during the process?
Cu(s) + AgNO3 - Ag(s) + Cu(NO3)2

Answers

A.108 grams
B.132 grams
C.146 grams
D.168 grams

Answer asap need to be answered by wednesday morning explain how a buffer works, using an ethanoic acid / sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.