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The M is an unidentified metal that you have to find. The problem gives you the molar mass of M(OH)2 so what you have to do is subtract the molar mass of OH2 off of the molar mass of the entire thing to find the metal M. After doing the calculation you will find that the molar mass of the metal is 40.08 which is Calcium. Calcium forms a compound with sulfur to form CaS and you'll have to find the molar mass of this sulfide.
Hannah Morales 1D wrote:Can there ever be an unidentified solid/gas and you would do the same thing Or willl we only ever come across unidentified metals?
Yeah there are possibilities that this same type of question could appear but with gases instead of metals. It's just that in terms of the periodic table, there are many more metals than there are nonmetals so as a question writer, it's easier to choose a random metal than a random gas.
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