[Simple question] Number of moles of a compound

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In summary, the question asks for an estimation of the number of molecules in a few grams of matter and explains why the natural logarithm of this number is approximately 50, regardless of the chemical composition. The equation used to solve this problem is M = m/N, where M is the molecular mass and m is the mass of the substance. The question also asks for the average molar mass of a compound composed of 4 atoms, as well as the lightest and heaviest possible compounds.
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Homework Statement



Estimate the number N of molecules in a few grams of matter. Explain why in that case ln (N) is of the order of 50 whatever the chemical composition.

Homework Equations



M = m/N

where M is the molecular mass

The Attempt at a Solution



I'm really unsure about the entire question. I have no idea what he's asking, but I might be over thinking it. I don't even know where to start.
 
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  • #2
What is the average molar mass of a typical compound made of just a few atoms?

Say - 4 atoms. What is the molar mass of the lightest possible compound? Of the heaviest one?
 

1. How do you calculate the number of moles of a compound?

To calculate the number of moles of a compound, you divide the given mass of the compound by its molar mass. The formula for calculating moles is: Moles = Mass (g) / Molar Mass (g/mol). This will give you the number of moles of the compound.

2. What is the molar mass of a compound and how is it determined?

The molar mass of a compound is the mass of one mole of that compound. It is determined by adding up the atomic masses of all the elements present in the compound. The atomic masses can be found on the periodic table.

3. Why is it important to know the number of moles of a compound?

Knowing the number of moles of a compound is important because it allows us to accurately measure and compare the amount of a substance present in a reaction. It also helps in determining the correct stoichiometric ratios for a reaction.

4. Is the number of moles of a compound always an integer?

No, the number of moles of a compound can be a decimal or a fraction. This is because the molar mass of a compound is the average mass of all the isotopes of its constituent elements, which can result in non-integer values.

5. Can you convert the number of moles of a compound to other units of measurement?

Yes, the number of moles can be converted to other units such as grams, kilograms, or even particles. This can be done by using conversion factors, which are based on the molar mass and Avogadro's number.

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