613. Write reaction equations and Nernst equations for the following galvanic cells
a) Pt(s)|Zn(Hg, l, x1)|Zn(NO3)2(aq)|Zn(Hg, l, x2)|Pt(s)
b) Pt(s)|H2(g, p1)|HBr(aq)|H2(p2)|Pt(s)
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