Calculating the Rest Mass Energy of One Mole of Neutrons

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SUMMARY

The rest mass energy of one mole of neutrons is calculated using the formula E=mc², where m is the total mass of the neutrons. Given that one mole contains 6.02 x 10²³ neutrons, and each neutron has a mass of 1.675 x 10⁻²⁷ kg, the total mass for one mole is 1.675 x 10⁻²⁷ kg multiplied by 6.02 x 10²³, resulting in a total mass of approximately 1.007 x 10⁻³ kg. Plugging this value into the equation E=mc² yields a rest mass energy of approximately 9.075 x 10¹⁶ joules.

PREREQUISITES
  • Understanding of Avogadro's number (6.02 x 10²³)
  • Knowledge of the mass of a neutron (1.675 x 10⁻²⁷ kg)
  • Familiarity with the equation E=mc²
  • Basic arithmetic operations for multiplication and unit conversion
NEXT STEPS
  • Study the implications of mass-energy equivalence in nuclear physics
  • Learn about the properties of neutrons and their role in atomic structure
  • Explore advanced calculations involving energy conversions in particle physics
  • Investigate the significance of Avogadro's number in chemical reactions
USEFUL FOR

Students in physics, particularly those studying nuclear physics, chemistry students learning about moles and mass, and educators looking for practical examples of mass-energy calculations.

tymartin
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Homework Statement


What is the rest mass energy of one mole of neutrons? Hint one mole is 6.02 x 1023 particles (avocado's number), and the neutron has mass m=1.675 x 10 -27 kg.


Homework Equations





The Attempt at a Solution



I wasn't sure of the relationship between moles and mass. What I attempted to do was multiply one mole by the mass. Then plugged in the equation of E=mc2. I came up with the answer of 9.075 x 10 16. This just doesn't seem right. Any help would be appreciated.
 
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I think it's perfectly correct as long as the value you have used for the neutrons mass is indeed its rest mass. Why doesn't it seem right to you?

----

(Me being a lazy boy I didn't check that you actually put the right values in your calculator)

As posted below one mole of neutrons is equal to 6.02 x 10^23 neutrons, which you multiply by the neutrons mass to get the total mass. Then it's a cake piece of.
 
Last edited:
tymartin said:

Homework Statement


What is the rest mass energy of one mole of neutrons? Hint one mole is 6.02 x 1023 particles (avocado's number), and the neutron has mass m=1.675 x 10 -27 kg.
Show us your work. What numbers did you multiply? What results? Units? You appear to be out by a few orders of magnitude.

A mole is just what is stated. It is Avogadro's number of particles. So a mole of neutrons is 6.02 x 10^23 neutrons.

AM
 
thanks for everyone's help
 

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