Problem: For the following ionic compounds formed with S2−, what is the empirical formula for the positive ion involved?(a) MnS, (b) Fe2S3 , (c) MoS2 , (d) K2S, (e) Ag2S

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S2−

The sulfide ion has a charge of –2.


(a) MnS

1 Mn: 1 S → to cancel out the charges

positive ion: Mn2+


(b) Fe2S3

2 Fe: 3 S → to cancel out the charges

positive ion: Fe3+


(c) MoS2

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For the following ionic compounds formed with S2−, what is the empirical formula for the positive ion involved?

(a) MnS, (b) Fe2S3 , (c) MoS2 , (d) K2S, (e) Ag2S

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