Current in amps is Coulombs/sec. You basically want to convert 5.21 g Ni/26.13 min to the units of current using the pseudo-conversion factors (where all the chemistry connections lie) that you know. You could also go from g of Ni to moles of Ni to moles of electrons to charge, then divide by the time in seconds to get current which is the framework I will discuss:
g of Ni ( mole/g Ni)( mole e/Mole Ni)(number of e/ 1 mole of e)(coul/e) = coulombs
The first term in parentheses is the inverse of molar mass of Ni, the second is 2, the third is Avogadro's number, and the fourth is the charge on an electron. The last two terms, you can replace with charge/mole e or the Faraday constant if you prefer.
Now divide the charge by the time in seconds and you have current.
Please consider a tutor.
