Use Coupon: CART20 and get 20% off on all online Study Material

Total Price: R

There are no items in this cart.
Continue Shopping
Get instant 20% OFF on Online Material.
coupon code: MOB20 | View Course list

Get extra R 520 off

				   The dissociation energy of H2 is 430.53 KJ/mol. If H2 is exposed to radiant energy of wavelength 253.7 nm, what % of radiant energy will be converted into KE?

7 years ago


Answers : (1)


The bond dissociation energy for the H-H bond is the energy required to break the H2 molecule (in its most stable geometry) into separate hydrogen atoms.

Radiant energy = 1242 eV-nm / 253.7 nm = 4.895 eV = 7.843x10-19 J

1 mole of electrons is 6.022 x 1023 electrons

so radiant energy = 472.28 KJ/mol

dissoc. energy     = 430.53 KJ/mol

KE = rad. enrgy - dissoc. energy

      = 472.28 - 430.53

      =41.75 KJ/mol

% of rad. enrgy to KE is = 41.75*100/472.28

                                           = 8.84 %


Please feel free to post as many doubts on our disucssion forum as you can. If you find any question difficult to understand - post it here and

we will get you the answer and detailed solution very quickly.We are all IITians and here to help you in your IIT JEE preparation. All the best.


Naga Ramesh

IIT Kgp - 2005 batch


7 years ago

Post Your Answer

Other Related Questions on Physical Chemistry

help me with it.please.............................................
Dear esha, Your question in the attachment is not clearly visible. Please repost it or write the question yourself.
Vikas TU one month ago
what is the element with highest density among all the elements of periodic table?
@ dharma osmium is the most densiest element in the periodic table . its a very rare element which occurs in a very trace amount in platinum ores . it have a density of 22.59 g/cc . after...
Umakant biswal one month ago
It is Osmium. The higher density of Osmium may be explained on the basis of its higher atomic mass and greater value of effective nuclear charge onto its outermost electrons.
harshul gupta one month ago
what transition of Li2+ spectrum will have same wavelength as that of second line of balmer series in he+ spectrum.
@ rishant can you recall the following formula ?? lambda=1/z^2{(1/n1^2)-(1/n2^2)}, if u can then , u can surely , solve this question . " BUT THIS QUESTION IS WRONG , SOME DATA GIVEN HERE...
Umakant biswal 3 months ago
their is some mistakes in the question even you try u can use the formula of rybergs and try to solve it but it cannot be solved because the question has an error
monu kumar 3 months ago
Metal hydride non metal hydride acidic or basic metal oxide nonmetal oxide acidic or basic?
Metal hydride is basic since it produces H - ion as metal are more electopositive than Hydrogen,while non-metal hydride is acidic since it produces H + ion asnon- metal are less...
Pranav Dabhade 15 days ago
suggest a good book for ORGANIC & INORGANIC Chemistry fot JEE(Mains & Advance) and also suggest a good book which has all the three sections of chemistry i.e, (Organic , Inorganic &...
@ aryan if u are considering both mains and adv , then they both are separate . beacuse jee mains testing how much facts u can remember , but jee adv are totally conceptual and they are...
Umakant biswal 2 months ago
From my actual experience read NCERT books thoroughly. Every step every word every paraagraph is important. Books U can take then as: Organic chemitsry by Morrison and Boyd or by Shishir...
Vikas TU 2 months ago
Explain why a sigma bond is stronger than a pi bond.
sigma bond is formed due to head on head overlapping of s orbitals. so ,they form stronger bonds as compared to pi bond which is formed due to parallel overlapping and gets easily broken...
ankit saurav 14 days ago
View all Questions »

  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: R 15,000
  • View Details
Get extra R 3,000 off

Get extra R 520 off

More Questions On Physical Chemistry

Ask Experts

Have any Question? Ask Experts

Post Question

Answer ‘n’ Earn
Attractive Gift
To Win!!!
Click Here for details