Data:
Molar Mass of Nickel = 58,7 g/mol
Solving:
58,7 g → 1 mol
y -------→ 2.63 mol
Solving: (They are proportional measures, the rule of three is made (directly proportional)
\(\frac{58.7}{y} = \frac{1}{2.63}\)
multiply cross
\(1*y = 58.7*2.63\)
\(y = 154.381\:g \stackrel{converting}{\longrightarrow}\:\boxed{y = 154381\:mg}\)