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

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Homework Help Overview

The discussion revolves around calculating the number of electrons in a silver pin based on its mass. The problem involves concepts from chemistry, specifically relating to moles, atomic structure, and electron count in elements.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants explore the relationship between mass, molar mass, and the number of moles. Questions arise regarding the correct interpretation of units and the application of Avogadro's number in the calculation.

Discussion Status

Some participants have provided guidance on the calculation process, while others have pointed out potential misunderstandings in unit conversion. There is an acknowledgment of different interpretations of the steps involved in reaching the solution.

Contextual Notes

The original poster's attempt at the calculation resulted in a unit of 1/moles, prompting questions about the correct approach. The discussion reflects a learning process with varying levels of understanding among participants.

Bwilli
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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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