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how many moles of sulfate ions are in a 300.ml solution of 0.010 M solution of...

how many moles of sulfate ions are in a 300.ml solution of 0.010 M solution of Al2(SO4)3 ?

1) 0.0030 moles
2) 0.0090 moles
3) 0.010 moles
4) 0.018 moles
5) 0.012 moles

please I need an answer with clear explanation!

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