Molar Mass and Metal/Sulfides

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Matt Jacobs 3H
Posts: 32
Joined: Fri Sep 25, 2015 3:00 am

Molar Mass and Metal/Sulfides

Postby Matt Jacobs 3H » Wed Sep 30, 2015 9:50 pm

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?
Can someone please explain what the sulfide of a metal is, and how it's molar mass differs from the metal. Thanks.

Marla Dimetrios 3J
Posts: 20
Joined: Fri Sep 25, 2015 3:00 am

Re: Molar Mass and Metal/Sulfides

Postby Marla Dimetrios 3J » Wed Sep 30, 2015 10:05 pm

This question has two parts:
1) you need to figure out the mystery metal and you can do so by subtracting the mass of the hydrogen and the oxygens from the molar mass given
74.10 - ( 2x1.008+2x15.999) =39.94 g/mol
if you look on the periodic table you will find that the closest element that that molar mass is Calcium
2) using Calcium ( the mystery metal ) you just found, solve for the molar mass of metal sulfide
in this case calcium sulfide so 40.078+32.05=72.13

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