Question

What is the mass of 2.60 moles of nickel oidide .nil2

Answer 1

Molar Mass is 312.502 g/mol

$$m=2.6mol\cdot312.502g/mol=812.5052g$$

The mass of 2.60 moles of nickel (II) iodide $(NiI_2)$ is 812.5052 g.