HW Q17: please help I tried everything

[Aisah_Akbar_2C]

im so confsued it says i used to mass of chlorine in kilograms per mole and it should be a single molecule..? how do i do that? please help I'm so lost and if anyone could pls show me their steps on how to get there that would be appreciated

[irisgu]

Hi, I was also stuck on this one, this is what I did to reach the solution:

1 J=1 kg⋅m2⋅s−2 to express the mass of the molecule in kg.

1.177×10−22 g/molecule×1 kg1000 g=1.177×10−25 kg/molecule

To calculate the wavelength of a chlorine molecule,

lambda=6.626×10−34 kg⋅m2⋅s−2⋅s(1.177×10−25 kg)(323.9 m⋅s−1)