What total power (in $mathrmkJ$) is contained in $1.0~mathrmmol$ of pholoads, all through a frequency of $2.75 cdot 10^14~mathrmHz$?

My answer was:The energy of photon in hydrogen atom is offered by the formula $E=h u$, wright here $h$ is Planck continuous and $ u$ is the frequency. After that I acquired a solution different from the correct answer which is $110~mathrmkJ$.

You are watching: How much energy (in kj) do 3.0 moles of photons, all with a wavelength of 655 nm, contain?

Could anyone describe why?



The formula $E=h u$ is for the energy of one photon. You have actually a mole of photons. You have to usage a slightly modified form:

$$E=Nh u$$

wright here $N$ is the variety of photons, in this case

$$eginalignN&=ncdot N_mathrm A\<6pt>&=1 mathrmmol imes6.02 imes10^23 mathrmmol^-1\<6pt>&=6.02 imes10^23endalign$$

Note that you are being asked to report energy in kilojoules not kilojoules per mole.

If I usage $E=nN_mathrm A h u$, I obtain the correct answer you cite of $110~mathrmkJ$. Do you?

Improve this answer
edited Nov 10 "16 at 14:48
answered Jul 2 "14 at 18:37

Ben NorrisBen Norris
40.9k88 gold badges112112 silver badges170170 bronze badges
Add a comment |

Your Answer

Thanks for contributing an answer to brianowens.tv Stack Exchange!

Please be sure to answer the question. Provide details and also share your research!

But avoid

Asking for assist, clarification, or responding to various other answers.Making statements based upon opinion; back them up through referrals or personal experience.

Use MathJax to format equations. MathJax reference.

To learn more, watch our tips on writing great answers.

See more: Search For O The Lost Patrol Search For Other Distress Signals

Draft saved
Draft discarded

Sign up or log in

Sign up utilizing Google
Sign up utilizing Facebook
Sign up using Email and Password

Blog post as a guest

Email Required, yet never before shown

Post as a guest


Required, yet never before shown

Article Your Answer Discard

By clicking “Article Your Answer”, you agree to our terms of service, privacy plan and also cookie plan

Not the answer you're looking for? Browse various other questions tagged thermodynamics electromagnetic-radiation or ask your very own question.

Featured on Meta
How to calculate the Gibbs totally free power from the equilibrium continuous for the decomplace of sodium bicarbonate?
How to identify the particular warmth of methanol from calorimeter data?
How to calculate the activation energy of diffusion of carbon in iron?
Thermobrianowens.tv Problem - How did they obtain that volume?
Is the warmth capacity boundless for a procedure at constant temperature?
Are photolysis reactions taken into consideration exothermic or endothermic?
A difficulty concerning the initially legislation of thermodynamics
Hot Netoccupational Questions even more hot inquiries

Concern feed
Subscribe to RSS
Concern feed To subscribe to this RSS feed, copy and also paste this URL right into your RSS reader.


Stack Exchange Network-related
website style / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. rev2021.9.10.40187

brianowens.tv Stack Exreadjust functions best via JavaScript allowed

Your privacy

By clicking “Accept all cookies”, you agree Stack Exadjust deserve to store cookies on your gadget and discshed indevelopment in accordance through our Cookie Policy.