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)
[tex] \frac{58.7}{y} = \frac{1}{2.63} [/tex]
multiply cross
[tex]1*y = 58.7*2.63[/tex]
[tex]y = 154.381\:g \stackrel{converting}{\longrightarrow}\:\boxed{y = 154381\:mg}[/tex]