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QUESTION

# How would you determine the formula and molar mass of aluminum sulfide?

"Aluminum sulfide" -= Al_2S_3.

So how did I know?

Aluminum commonly forms an Al^(3+) ion.

And sulfur (like congeneric oxygen) commonly forms a S^(2-) ion.

To make a neutral salt, the charge must balance hence, Al_2S_3.

Note that these ionic identities can be predicted by the position of these on . How?

And as to the masses, sulfur has a mass of 32.06*g*mol^-1, and aluminum has a mass of 26.98*g*mol^-1.

And thus the molar mass of "aluminum sulfide "= (2xx26.98+3xx32.06)*g*mol^-1=??*g*mol^-1.