Sapling #10

[Aria Movassaghi 1A]

Can someone please help with following problem from sapling? Thanks!

The average speed of a diatomic fluorine molecule at 25 ∘C is 442.4 m⋅s−1 . What is the average wavelength of a fluorine molecule at this temperature? Assume that the molecule acts as a single particle.

[Lily Anne Garcia 1C]

Use wavelength=h/mv but make sure the mass is its diatomic weight (x2) and divided by avogadros number

[Hazelle Gunawan 3G]

I agree with the previous reply! I'd also add that you should make sure your mass is in kilograms, not grams, because I know I always forget that.

[Irene Nguyen 2J]

Use De Broglie for wavelength= h/mv. To find the mass, use the molar mass of fluorine, multiply by two for diatomic (2) mass, divide by Avogadro's number and then convert to kg. You can then substitute all known values and solve for wavelength.