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Postby Rachael_1H » Thu Oct 01, 2015 9:44 pm

Hello. What is a sulfide and how do we find a sulfide's molar mass? I came across a problem in the fundamentals section of the textbook that required knowledge of sulfides: "The molar mass of the metal hydroxide M(OH)2 is 74.10 g/mol. What is the molar mass of the sulfide of this metal?"

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Re: Sulfides

Postby Chem_Mod » Thu Oct 01, 2015 9:53 pm

Sulfide is the ion S2- so you know that the formula of the metal sulfide is just MS

Then you can take the molar mass of the metal hydroxide, subtract the weight of two hydroxides, and add back the weight of one sulfur.

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