We can do this by using the formula for moles, which is mass divided by molar mass. The molar mass of NiO is approximately 74.69 g/mol. So, the number of moles of NiO is given by:
\[n_{NiO} = \frac{m_{NiO}}{M_{NiO}} = \frac{24.78 g}{74.69 g/mol} = 0.3317 mol\]
Show more…