[nupatel87]

 Hey everyone, I need help on some chemistry questions.

1) What is the energy, in J, of .888 moles of light photons having a frequency of 7.93E16 s^-1?

This question has me stumped. The first part of the question was simple, find in energy in a single photon with a frequency of 7.93E16 s^16. For this part I used the equation E = (h)(v). h = planck's constant; v = frequency.
So I got E = (6.626E-34)(7.93E16) = 5.25E-17 J.

I got the first part correct, but I am not sure how to take .888 moles of a photon.

2)What is the wavelength, in meters, of electromagnetic radiation that has a frequency of 4.58E10 s^-1 ?
   For this problem I used the equation wavelength =  speed of light(c) / frequency(v).
   So I first converted speed of light from  9.5E12 km to 9.5E15 m, because the answer is supposed to be in meters.
   So I got  wavelength = (9.5E15)/(4.58E10) =  207423 meters. When I fixed it for sig figs I got 207000 which was      wrong. What did I do wrong?

Thanks for any help in advance.

[Yggdrasil]

Hey everyone, I need help on some chemistry questions.

1) What is the energy, in J, of .888 moles of light photons having a frequency of 7.93E16 s^-1?

This question has me stumped. The first part of the question was simple, find in energy in a single photon with a frequency of 7.93E16 s^16. For this part I used the equation E = (h)(v). h = planck's constant; v = frequency.
So I got E = (6.626E-34)(7.93E16) = 5.25E-17 J.

I got the first part correct, but I am not sure how to take .888 moles of a photon.

There are 6.02x10²³ particles in a mole.  How many particles are in 0.888 moles?

2)What is the wavelength, in meters, of electromagnetic radiation that has a frequency of 4.58E10 s^-1 ?
   For this problem I used the equation wavelength =  speed of light(c) / frequency(v).
   So I first converted speed of light from  9.5E12 km to 9.5E15 m, because the answer is supposed to be in meters.
   So I got  wavelength = (9.5E15)/(4.58E10) =  207423 meters. When I fixed it for sig figs I got 207000 which was      wrong. What did I do wrong?

c = 3.0x10⁸ m/s