Question

What is the mass of 2.3 x 1021 formula units of cobalt(II) bromate?

Answer 1

Molecular mass of Cobalt(II) Bromide  = 218.7412 g/mol .

Explanation:

Percent composition by element:

The procedure to find the Molecular mass of Cobalt(II) Bromide:

The symbol of the Cobalt is Co.

The symbol of the Bromate is Br.

The Element cobalt have the Atomic Mass of 58.933200 with 1 number of atom.

The Element Bromine have the Atomic Mass of 79.904 with 2 number of atoms.

Molecular weight calculation:

To find the molecular mass we have to sum both of the Atomic masses:

For Cobalt(II) Bromide: We have to multiple the Atomic mass of  bromate with 2 and then sum the atomic masses  

$58.9332+79.904 \times 2 =218.7412g/mol$

Molecular mass of Cobalt(II) Bromide  = 218.7412 g/mol