Calculating the standard e.m.f of a cell? Please help?!

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I am so stuck on this question please could you guide me how to work it out?

The question says:

Calculate the standard e.m.f. of the cell at 298 K?

1) Ni (s) | Ni 2+^ (aq)|| Sn 2+^ (aq), Sn 4+^ (aq) |pt


Will I have to use the Nernst equation? The questi does not even state if its standard or non standard? do i ignore the 298 K??