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In the formula Ca₂SO₄, the subscript 2 means that the formula contains
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In the formula Ca₂SO₄, the subscript 2 means that the formula contains

User RichardOD
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In short, the subscribt just tells you how many molecules that this compound contains. The "2" indicates that there are 2 molecules of calcium, while the "SO4" represents a sulfate ion.

User Mpet
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