Calculating Negative Charge in Nitrogen Gas: A Static Electricity Problem

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SUMMARY

The discussion centers on calculating the amount of nitrogen gas (N2) corresponding to a negative charge of 0.8 MCb. The correct answer is 5.92 x 10^(-1) mol, derived from the charge per mole of nitrogen atoms, which is calculated as 6.74 x 10^(5) Cb/mol. The user incorrectly calculated the number of moles as 1.19 by using the formula n = Q / charge per mole. Understanding the correct application of Avogadro's number and the charge of electrons is crucial for solving this problem accurately.

PREREQUISITES
  • Understanding of static electricity and charge units (MCb, Cb)
  • Familiarity with Avogadro's number (6.02 x 10^23)
  • Knowledge of atomic structure, specifically nitrogen (N2) and its electron configuration
  • Basic proficiency in mole calculations in chemistry
NEXT STEPS
  • Review calculations involving charge and moles in chemistry
  • Study the relationship between charge, number of electrons, and moles
  • Learn about static electricity principles and their applications in physics
  • Explore more complex problems involving gas laws and molecular calculations
USEFUL FOR

This discussion is beneficial for first-year university physics students, educators teaching static electricity concepts, and anyone seeking to improve their understanding of mole calculations in chemistry.

jmail
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So, I'm in first year university physics and each week we have online quizzes. And I'm having trouble figuring out how I got this question wrong.

Q: In what amount of nitrogen gas are 0.8 MCb of negative charge? Note: each nitrogen atom has 7 electrons.

The answer they gave is 5.92 x 10^(-1) mol
but I'm not getting this answer, and I've tried so many times.

I keep on getting 1.19 x 10^(0) mol.
---> What I did was find Q by = (7)(1.6 x 10^-19)(6.02 x 10^23) = 6.74 x 10^(5) Cb/mol
---> Then to find n I did = 0.8 x 10^6 / 6.74 x 10^5 = 1.19

If anyone could help me, that would be great. This problem is really bothering me.
THANKS :)
 
Physics news on Phys.org
Remember nitrogen gas is N2
 
i think maybe this should be moved to the homework forums?
 

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