How do you find the number of electrons given a mass fo the object?

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SUMMARY

The discussion focuses on calculating the number of electrons in a 13.0 g silver pin, utilizing its molar mass of 107.87 g/mole and the fact that silver has 47 electrons per atom. The correct calculation involves determining the number of moles of silver using the formula (mass of the pin)/(molar mass), followed by multiplying by Avogadro's number (6.022E23 atoms/mole) and the number of electrons per atom. The final result is 3.41E24 electrons in the silver pin.

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  • Familiarity with Avogadro's number (6.022E23)
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Homework Statement



(a) Calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 13.0 g. Silver has 47 electrons per atom, and its molar mass is 107.87 g/mole.


Homework Equations


N/A


The Attempt at a Solution



I thought to try using the molar mass given and dividing it by mass of the pin.
107.87g/mole / 13 g = 8.298 1/mole

After this point I didn't know what to do next
 
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How many atoms are in a mole?
 
I think you were trying to find the number of moles of silver in the pin, but you would up with a unit of 1/moles in your calculation.

What does this tell you about how to do the calculation correctly?
 
Thanks a lot! I used avogadro's number.

(13g)/(107.87g/mole)*(6.022E23atoms/mole)*(47electrons) = 3.41E24 electrons in the silver pin
 

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