Q - An electrochemical reaction occurs between an unknown element and zinc. The half-cell reaction for the zinc is:

Question

Zn(s) → Zn2+(aq) + 2e−
The cell potential for the reaction is Eºcell = 1.83 V.

Is the reaction spontaneous or nonspontaneous? Explain.

What is the half-cell potential of the unknown species?

What is the identity of the unknown element?

I think that the reaction is spontaneous because no outside force is required for it to take place. The half-cell potential is 0.915 and the unknown element is Mercury. Could you check my answers and help if I got them wrong?