Find in which case the Zn pole mass is greater

[prishila]

Homework Statement

A pole of Zn is put in a FeCl2 solution and in a HgCl2 solution. FInd in which case the mass of the pole of zinc has become grater and when less

Homework Equations

Zn+FeCl2->ZnCl2+Fe
Zn+HgCl2->ZnCl2Hg

The Attempt at a Solution

As Zn is much active than Hg than it goes in the Hg compound to form ZnCl2. By making the mass of the pole less. But I'm not sure about the answer as the two reactions seem to be similar.

 

[Borek]

Two things to consider - whether the reaction takes place at all (reactivity series), how does the mass of the solid change during the reaction (depends on the masses of ions involved and their stoichiometric ratio).