Carbonate is CO3 with a -2 charge and, Aluminum has a +3 charge
On combining them it would be Al2(CO3)3, meaning that the compound has —
2 total Aluminums
3 total carbons
9 total Oxygen
Now, mass of Aluminum (2×27= 54 amu)
mass of Carbon(3×12 = 36 amu)
And, mass of Oxygen (9×16 = 144 amu)
Therefore, sum of all masses (Al+C+O) = 54+36+144 = 234 amu
Thus, 234 grams exist in 1 Mole of Aluminum Carbonate.
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What is formula unit mass ?
- It is similar to molecular mass except for the fact that it is used for the substances whose constituent particles are ions . It is the sum of atomic masses of elements present in a formula unit of a substance .
To find,
Formula unit mass of Al2(CO3)3
Solution :
Here ions are :-
Al 3+
CO3 2-
Formula unit mass = 27×2 + ( 12 + 48 )3
= 54 + 180
= 234u or 234amu
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