A. E/photon = hc/wavelength.
wavelength = 1.350E-9 m
B. I obtained 40.08 using 6.022E23 for Avogadro's number.
C. looks ok to me.
D. c = freq x wavelgnth
1) Calculate the energy. in joules, of a photon of wavelength 1.250x 10^3 nm
2) If 3.011x 10^23 molecules have a mass of 20.04 grams, what is the molar mass of the substance?
Is it 40.07g/mol?
3) 47.5g of Boron contains __________ atoms of B?
Is it 2.65x10^24
4) What is the wavelength in meters, of a radio wave of frequency 2.8 x 10^18 1/s?
2 answers
A. is wrong that is not one of the answers. I have calculated 1.5912 X 10^-28
but the only near answer is 1.591 x 10^-19
but the only near answer is 1.591 x 10^-19