When m2s3(s) is heated in air, it is converted to mo2(s). a 3.280 g sample of m2s3(s) shows a decrease in mass of 0.228 g when it is heated in air. what is the average atomic mass of m?

The average atomic mass of M is 181.33 g/mol.

Explanation:

First off we need to know the reaction that takes place. The balanced reaction of M₂S₃(s) is:

The important section for this problem is this:

**Thus, the number of moles of M in M₂S₃ is equal to the number of moles of M in 2MO₂.

The decrease in mass means that M₂S₃ reacted and produced MO₂, thus the mass of MO₂ is 3.280-0.228=3.052 g

Now let's say x is the atomic weight of M, and write the molecular weights (Mw) of those two compounds:

Mw of M₂S₃= 2x + 96 g/mol

Mw of MO₂= x + 32 g/mol

Now we determine the moles of each compound, using the formula [ moles = mass / molecular weight ]:

Moles of M₂S₃=

Moles of MO₂=  

Using the equivalence marked by asterisks, we're left with (note that the second denominator is multiplied by 2 because of the reaction coefficients):

We solve for x:

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Thus, the average atomic mass of M is 181.33 g/mol.

The water molecule has a total of 10 protons and 10 electrons (8 from the oxygen atom and 1 from each of the two hydrogen atoms). Since it has the same number of protons and electrons, the water molecule is neutral. The electron cloud model shows where electrons are in a molecule.

- BRAINLIEST answerer