A thing used to tie something or to fasten things together.
"she brushed back a curl that had strayed from its bonds"
OR
An agreement with legal force, in particular.
Vanadium(II) sulfate
Vanadium(III) sulfate is the inorganic compound with the formula V2(SO4)3
First, you need to calculate the standard cell potential using standard reduction potential from a textbook or online. Since Mg becomes Mg+2, magnesium is being oxidized because it is losing electrons, you need to flip its potential
Fe+2 + 2e- --> Fe potential= -0.44
Mg+2 + 2e- --> Mg potential= -2.37
Cell potential= (-0.44) + (+2.37)= 1.93 V
Now, you need to use Nernst formula to get the answer. I have attached a PDF with the work.