Question

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

Answer 1

27.4/58.93= .465 mol Co

Answer 2

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