anonymous
  • anonymous
Calculate the de Brolie wavelength (in nm) of a hydrogen atom (m=1.674 x 10^-27 kg) moving at 1430 cm/s.
Chemistry
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
do you know de brogile's formula?
anonymous
  • anonymous
Not really
anonymous
  • anonymous
\(\sf p=h/ \lambda\)? p=momentum, h=planck's constant, lambda=wavelength.. rearrange the formula to solve for the wavelength: \(\sf \lambda =h/p \) you know that momentum is equal to mass times velocity so sub p=mv to the equation.. it will be \(\sf \lambda =h/mv \) Sub in your given values, just be careful about the units though :)

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More answers

anonymous
  • anonymous
do you know the value for Planck's constant?
anonymous
  • anonymous
yes. 6.626 x 10^-34
anonymous
  • anonymous
don't forget the unit, it is very important
anonymous
  • anonymous
(6.626x10^34 kg m^2/s^2 s)/(1.674x10^-27kg)(14.3m)
anonymous
  • anonymous
**it should be 6.626x10^34 kg m^2/s and 14.3 m/s kg, m, and s will get cancelled out, so your answer would be in metres, what will you get when you calculated that?
anonymous
  • anonymous
1586145132 m
anonymous
  • anonymous
i got a different answer..
anonymous
  • anonymous
try recalculating it again.. |dw:1443058593861:dw|
anonymous
  • anonymous
I got that answer when I did it again to double check.
anonymous
  • anonymous
Got 2.767983959x10^-8
anonymous
  • anonymous
Is that what you got?
anonymous
  • anonymous
okay, i think we got the same answer now. Last thing you have to do is to convert that to nm
anonymous
  • anonymous
I multiple by 1.0 x 10^-9 right?
anonymous
  • anonymous
yeah.. but i think it should be 1x10^9 nm because you're going from m to nm If you are converting from nm to m, then it will be x10^-9
anonymous
  • anonymous
I got 27..67983959
anonymous
  • anonymous
*27.6798359

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