Hi,
I'm having trouble approaching this problem. I viewed the solution, but am still a little confused on how they got there.
1.B.9
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Valerie Vandersal 1G
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Re: 1.B.9
Hi! For this one the question is: A lamp rated at 32 W (1W=1J/s) emits violet light of wavelength 420nm. How many photons of violet light can the lamp generate in 2.0s? How many moles of photons are emitted in that time interval?
I first started by finding the energy by multiplying 2s x 32J/s=64J. I also converted the 420 nm to m. I used the equation E=hc/lambda, and plugged in E=(6.6.26x10^-34)(3x10^8)/(4.2x10^-7)= 4.73x10^-19J/photon
Then, I divided the 64 J by 4.73x10^-19 J/photon in order to get the number of photons, which should be 1.35x10^20. I divided this number by avogadros number to get the number of mols, which should be 2.25 x 10^-4 mol. I hope this helps!
I first started by finding the energy by multiplying 2s x 32J/s=64J. I also converted the 420 nm to m. I used the equation E=hc/lambda, and plugged in E=(6.6.26x10^-34)(3x10^8)/(4.2x10^-7)= 4.73x10^-19J/photon
Then, I divided the 64 J by 4.73x10^-19 J/photon in order to get the number of photons, which should be 1.35x10^20. I divided this number by avogadros number to get the number of mols, which should be 2.25 x 10^-4 mol. I hope this helps!
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