What is the mass of 2.3 x 1021 formula units of cobalt(II) bromate?
1 answer:
Molecular mass of Cobalt(II) Bromide = 218.7412 g/mol .
<u>Explanation:</u>
<u>Percent composition by element: </u>
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.
<u>Molecular weight calculation: </u>
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
Molecular mass of Cobalt(II) Bromide = 218.7412 g/mol
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Given :
Number of molecules of hydrogen peroxide, N = 4.5 × 10²².
To Find :
The mass of given molecules of hydrogen peroxide.
Solution :
We know, 1 mole of every compound contains Nₐ = 6.022 × 10²³ molecules.
So, number of moles of hydrogen peroxide is :
Now, mass of hydrogen peroxide is given as :
m = n × M.M
m = 0.0747 × 34 grams
m = 2.54 grams
Hence, this is the required solution.