EMF of the following cell

Cu| CuSO4(aq, 1.0 mol/kg) | Hg2SO4(s)| Hg(I)| Pt

at 25° C and 1 bar is 0.36 V. The value of the mean activity coefficient (rounded off to three decimal places) of CuSO4 at 25° C 1 bar is

[Given : Standard electrode potential values at 25° C for

Cu2+ + 2e– → Cu and

Hg2SO4 + 2e– → 2Hg + SO42-:

are 0.34 V and 0.62 V, respectively.

[Consider: RT/F at 25° C = 0.0256V]