Question

The standard electrode potentials of a metal H and Iron are given below.
Fe²⁺_(aq) + 2e  →Fe_(s) -0.44V

H²⁺_(aq) + 2e   →H_(s) -0.91V

Is the reaction below possible ? Show your working 
Fe_(s) + H2+_(aq)  →H_(s) + Fe²⁺

Answer 1

Emf = -0.91-( -0.44)= -0.47V
The reaction is not possible  since overall emf is negative