Question

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what is the molar mass of A1(C1O2)3 ? Explain how you calculated this value.

Answer 1

Well that compound does not exist...
however I think you confused the 1 with the lowercase letter L.
So it would be \(\Large Al(ClO_2)_3\) which is the formula for aluminium chlorite.

To calculate the molar mass, you check how many atoms of the same element you got.
We got 1 aluminum atom
the part in parenthesis is multiplied by 3 because of the subscript 3 after the parenthesis.
So we have 3 chlorine atoms and 2*3= 6 oxygen atoms

Now we go to a periodic table ( http://ptable.com ) and check for the atomic mass of each element.

Aluminium = 26.981
Chlorine = 35.45
Oxygen = 15.999

Now just multiply that with the amount of atoms you have.
So:
Al = 1 * 26.981 = 26.981
Cl = 3 * 35.45 = 106.35
O = 6 * 15.999 = 95.994
we add that ------ +
And we have: 229.325 g/mol

Answer 2

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