Wavelength question using Planck's constant?

Question

1. What is the wavelength of a 19F+ ion which is moving with a speed of 4.255x10^5 m/s?

I come up with 8.2001x10^-41m but the choices available are:
4.936x10^-20m
4.936x10^-17m
4.936x10^-14m
1.484x10^-29m
1.484x10^-26m

Answer 1

Did you remember to divide the molar mass of 19F+ by Avogadro's number to get g, and then by a thousand to get kg?

You need to use consistent SI units in all these mass/momentum/wavelength/energy type problems.