How do you calculate the formula mass of aluminum carbonate?

Answer 1

Of #"aluminum carbonate"#, the formula mass is the sum of the individual atomic masses; approx. #234.08*g*mol^-1#.

The formula mass of #Al_2(CO_3)_3# #=# #{2xx26.98("Al")+3xx12.011("C")+9xx15.999("O")}*g*mol^-1}# #=# #??#

Where did I obtain the specific atomic masses? Were they facts that I knew off hand? If this is a test question, where will you obtain the information?

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Answer 2

Mateo Aguilar

To calculate the formula mass of aluminum carbonate, you add the atomic masses of all the atoms in the compound. Aluminum carbonate (Al₂(CO₃)₃) consists of two aluminum atoms (Al), three carbonate ions (CO₃). The atomic mass of aluminum is approximately 26.98 g/mol, and the atomic mass of carbon and oxygen (in the carbonate ion) are approximately 12.01 g/mol and 16.00 g/mol, respectively. So, the formula mass of aluminum carbonate would be:

[2(26.98 , \text{g/mol}) + 3(12.01 , \text{g/mol} + 3(16.00 , \text{g/mol})]

[= 53.96 , \text{g/mol} + 36.03 , \text{g/mol} + 48.00 , \text{g/mol}]

[= 137.99 , \text{g/mol}]

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.