(adsbygoogle = window.adsbygoogle || []).push({}); Calculte the Energy of 1 mole of photons - Help!!!

1. The problem statement, all variables and given/known data

Calculate the energy, in kilojoules, of one mole of photons of yellow laser light of wavelength 570 nm.

The correct answer is:2.10x10^{2}

2. Relevant equations

Ephoton= hc/wavelength

3. The attempt at a solution

Step by step:

1. Convert the wavelength of 570nm to m:

10-9m= 1 nm, so:

570nm * (10-9m) = 5.7E-7 m

2. Ephoton= hc/wavelength

Ephoton= (6.63E-34 * 3.E8)/5.7E-7 m

Ephoton= 3.49E-19 J

3. Finally, I convert to kJ:

Ephoton= 3.49E-19J/1000J = 3.49E-22 kJ

Can someone help me with this problem, I tried many times but I still get the same result.

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# Homework Help: Calculte the Energy of 1 mole of photons - Help

**Physics Forums | Science Articles, Homework Help, Discussion**