Homework problem Fundamentals E.15

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Jennah Muhammad 1H
Posts: 16
Joined: Sat Jul 09, 2016 3:00 am

Homework problem Fundamentals E.15

Postby Jennah Muhammad 1H » Sun Oct 02, 2016 9:06 pm

Im sure I am very rusty with Chemistry. The question is asking for the molar mass of the sulfide of the metal hydroxide and I am not understanding how to even go about the problem. Please explain...

DanielaWong_2G
Posts: 20
Joined: Wed Sep 21, 2016 2:56 pm

Re: Homework problem Fundamentals E.15

Postby DanielaWong_2G » Sun Oct 02, 2016 9:26 pm

So I think what's happening is that there is no specific metal that they're asking for. So you'd start off by figuring out the mass of OH which is 34.02. You subtract that from the overall mass and it leaves you with 40.08 (the mass of Ca). Since they're asking for SULFIDE, you can add the mass of sulfur to the mass of Ca, to give you calcium sulfide whose molar mass turns out to be 72.15 g * mol^-1.

At least I think that's how it's solved!


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