E.15 The molar mass of the metal hydroxide M ( OH ) 2 is 74.10 g⋅mol −1 . What is the molar mass of the sulfide of this metal?
What is the molar mass of the sulfide of this metal? Do we know what the metal is/how do we tell? Can someone please explain what the sulfide of metal is, and how its molar mass differs from the metal? Thanks.
Textbook Practice Problem E15
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Re: Textbook Practice Problem E15
Also is the 'M' in the problem representative of an element? Is that the mystery metal we're supposed to be solving for?
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Re: Textbook Practice Problem E15
In this problem it is a mystery metal denoted by "M"
1. In order to figure out the mystery metal, subtract the mass of the OH's from the molar mass given
74.10 - ( 2x1.008+2x15.999) =39.94 g/mol
Then, we look on the periodic table to see which element has the closest molar mass to that (Calcium)
2. solve for the molar mass of Calcium Sulfide 40.078+32.05=72.13
1. In order to figure out the mystery metal, subtract the mass of the OH's from the molar mass given
74.10 - ( 2x1.008+2x15.999) =39.94 g/mol
Then, we look on the periodic table to see which element has the closest molar mass to that (Calcium)
2. solve for the molar mass of Calcium Sulfide 40.078+32.05=72.13
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Re: Textbook Practice Problem E15
This problem is asking you to find M(x)S(x), which is the metal sulfide. You know the molar mass of the metal by subtracting the molar masses of 2 oxygen and 2 hydrogen atoms from 74.10 g/mol. You also know the charge is +2 because hydroxide is -1, and there are two hydroxide ions. Then, the sulfide will be MS (find the metal on the periodic table), and add the molar masses of the metal and sulfur together.
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