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Home / Doubts and Solutions/NEET/Chemistry

I don't want to know the solution but I just want to know how to proceed with this numerical from atomic structure

Question: it has been found that gaseous iodine molecules dissociate into iodine stomach after absorption of light at wavelength 4995 A. The energy required to dissociate 1 mole of iodine molecules is? 

 

Asked by pranitic 6th August 2018, 8:46 PM
Answered by Expert
Answer:
Given:
 
Wavelength = 4995 °A
 
As 1 mole = Avogadro's number of molecules
 
 
 
We space know comma straight E equals straight N subscript straight A hc over straight lambda Where comma straight N subscript straight A space equals space 6.023 cross times 10 to the power of 23 straight h equals 6.626 cross times 10 to the power of negative 34 end exponent straight c equals 3 cross times 10 to the power of 8 straight lambda equals 4995 to the power of ring operator straight A space equals 4995 cross times 10 to the power of negative 10 space end exponent straight m straight E equals space fraction numerator space 6.023 cross times 10 to the power of 23 cross times 6.626 cross times 10 to the power of negative 34 end exponent cross times 3 cross times 10 to the power of 8 over denominator 4995 cross times 10 to the power of negative 10 space end exponent end fraction straight E space equals space 239.69 space cal space space space equals fraction numerator space 239.69 over denominator 4.184 end fraction space kcal divided by mol straight E space equals 57.28 space kcal divided by mol
 
The energy required is 57.28 kcal/mol
Answered by Expert 7th August 2018, 5:10 PM
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