How many moles of cobalt (Co, 58.93 g/mol) are in 27.4 grams of cobalt

27.4/58.93 =.465 mol Co

Number of moles of cobalt can be calculated as given mass of the substance divided by the molar mass of the substance.

Here, given mass of the cobalt = 27.4 g

Molar mass of the cobalt = 58.9 g

Number of moles of a substance = / frac{Given mass of the substance}{Molar mass of the substance}

Number of moles of cobalt = / frac{Given mass of the cobalt}{Molar mass of the cobalt}

=/frac{27.4}{58.9}

=0.465 mol

So, number of moles of cobalt will be 0.465 mol