Does Al2S3 contain 3 moles of sulfur?

[geffman1]

Homework Statement

say it says Al2S3(numbers are subscripts) is that saying you have 3 moles of sulfur?

Homework Equations

The Attempt at a Solution

 

[Dr.D]

No it is not.

 

[Borek]

It means molecule of Al₂S₃ contains 2 atoms of Al and three atoms of S. It also means 1 mole of molecules of Al₂S₃ contain 2 moles of Al atoms and three moles of S atoms.