anonymous
  • anonymous
the mass of 4Be7 is 1.1652*10, what is the defect of the beryllium nucleus?
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
proton mass = 1.6*10^-27 neutron mass = 1.67*10^-27
fretje
  • fretje
Beryllium is dangerous. and your data is wrong. 4Be7 is not stable. calculating mass defect for 4Be9: electron mass 9.10938291 × 10-31 kg proton mass 1.67262178 × 10-27 kg neutron mass 1.674894121 × 10-27 kg Be mass 14.96510886 × 10-27 kg mass defect = \[\Delta m\] = 4*1.67262178 × 10^-27 + 5*1.674894121 × 10^-27+4*9.10938291 × 10^-31 - 14.96510886 × 10^-27 = 0.10349261816 × 10^-27
fretje
  • fretje
\[\Delta m = 0.10349261816 × 10^{-27} kg\]

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anonymous
  • anonymous
what formula did u use ?
anonymous
  • anonymous
@Luigi0210
anonymous
  • anonymous
@cwrw238
anonymous
  • anonymous
@nechirwan
cwrw238
  • cwrw238
sorry cany help with this one
fretje
  • fretje
so what i did, i added from given data from internet, the mass of all the protons(4 times), all the neutrons(5 times), and all the electrons in the element (4times), and subtract the given mass of the element from the table of Mendeliev. The result is the mass defect. electron mass 9.10938291 × 10-31 kg proton mass 1.67262178 × 10-27 kg neutron mass 1.674894121 × 10-27 kg Beryllium (Be) mass 14.96510886 × 10-27 kg Mass defect = 4*1.67262178 × 10^-27 + 5*1.674894121 × 10^-27+4*9.10938291 × 10^-31 - 14.96510886 × 10^-27 = 0.10349261816 × 10^-27 To understand mass defect one can read http://physics.bu.edu/~duffy/sc546_notes10/mass_defect.html

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