How many gm of silver will be displaced from a

solution of AgNO 3 by 4 gm of magnesium?

(a) 4 gm

(b) 16 gm

(c) 18 gm

(d) 36 gm.

2AgNO3+Mg ->  Mg(NO3)2+2Ag

4 gm=>4/24 moles,

One moles gives two,

Therefore, 1/6 gives 1/3 moles

or 1/3 * 108 = 36 gm.