What Is the Average Atomic Mass of M in M2S3?

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SUMMARY

The average atomic mass of element M in the compound M2S3 can be determined through stoichiometric calculations based on the mass loss during the conversion to MO2. A 4.000g sample of M2S3 loses 0.277g upon heating, resulting in a mass of 3.733g for the produced MO2. By applying the balanced reaction equation M2S3 + O2 -> MO2 + SO2, one can derive the molar mass of M using the relationship between the masses of the reactants and products.

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George3
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Homework Statement


When M2S3 is heated in air, it is converted to MO2. A 4.000g sample of M2S3 shows a decrease in mass of .277 g when it is heated in air. What is the average atomic mass of M?


Homework Equations





The Attempt at a Solution


I don't not really know how to tackle this problem. I know the mass of MO2 would be 3.833g.
 
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Your problem description indicates that 0.277 grams of M2S3 gave its stoichiometric amount of MO2. How do you know that the mass of MO2 is 3.833 grams as you say in your solution attempt? Your description does not give enough information for that. I might be missing something in my logic.
 
I think George means 3.733.

George, start with a balanced reaction equation:

M2S3 + O2 -> MO2 + SO2

Try to express mass of MO2 produced in terms of masses and molar masses or reagents, that should give you one equation with one unknown - molar mass of M.
 

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