Calculating Mass of Electrons in GRAMS

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    Electrons Grams
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Discussion Overview

The discussion revolves around a homework problem involving the calculation of the mass of a sample of electrons based on its total charge. Participants explore the steps taken to arrive at the solution and troubleshoot issues related to an online quiz format.

Discussion Character

  • Homework-related
  • Technical explanation

Main Points Raised

  • One participant states that the total charge of -7.68 x 10^8 C corresponds to approximately 4.79e27 electrons, which they claim is correct.
  • Another participant suggests keeping more significant digits in the calculation of the mass, leading to a value of 4.366556698 grams, which they still find incorrect.
  • There is a question about how the answer is being checked, with one participant indicating that it is an online quiz that provides immediate feedback on correctness.
  • Concerns are raised about the quiz potentially miscounting answers due to formatting issues, such as spelling or spacing, despite the calculations appearing correct to some participants.
  • A later reply indicates that the original participant resolved their issue, attributing it to a technical error rather than a mistake in their calculations.

Areas of Agreement / Disagreement

Participants generally agree that the calculations appear correct, but there is uncertainty regarding the quiz's response to their answers. The discussion reflects multiple viewpoints on the potential reasons for the discrepancies encountered.

Contextual Notes

Participants express concerns about the quiz's formatting requirements and how these may affect the assessment of their answers, indicating that the problem may not solely lie in the calculations themselves.

deteam
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Electrons in GRAMS :(

Homework Statement



Part1:

A sample of electrons is found to have a total charge of -7.68 x 10^8 C.
How many electrons are in this sample ?
===================================
Part 2 says:

What is the mass of the above sample of electrons in grams ?


Homework Equations


1 electron mass = 9.10938188 × 10^-28 grams]


The Attempt at a Solution



for part 1 My answer was 4.79e27. And its CORRECT

for part 2 i keep getting 4.36 as an answer but its wrong.

I used [1 electron mass = 9.10938188 × 10^-28 grams]

and multiplied that by my answer for part 1.

PLEASE HELP, Thanks.
 
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How about keeping a couple more digits in that 4.79e27?
 


diazona said:
How about keeping a couple more digits in that 4.79e27?

tried that and got 4.366556698 and was still wrong even using only 3 sig figs

Help please
 


How are you checking your answer?
 


PhaseShifter said:
How are you checking your answer?



its a quiz online, tells me whether I am correct or incorrect

Any more help guys ?
 


Hmm, multiple choice or one of those annoying computer quizzes that counts an answer wrong when it's misspelled, has a space left out, etc?

The math looks OK to me, it could just be the quiz expects something like spelling out units rather than using the abbreviation.
 


PhaseShifter said:
Hmm, multiple choice or one of those annoying computer quizzes that counts an answer wrong when it's misspelled, has a space left out, etc?

The math looks OK to me, it could just be the quiz expects something like spelling out units rather than using the abbreviation.


no its fill in the blank, but it specifically says "IN GRAMS" and "WITHOUT UNITS" and since the first part I got right with only 3 sig figs, I thought that was my problem here, but it was still wrong.

Help please.
 


Sorry I got the same answer as you, must be something wrong with the quiz

Stay Up
-1-
 


deteam said:
tried that and got 4.366556698 and was still wrong even using only 3 sig figs

I understand you have tried 4.37?
 
  • #10


Borek said:
I understand you have tried 4.37?

ya I got the problem fixed it wasn't my answer that was wrong it was a technical error.

Thanks for the help guys !
 

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