How do I find the mass of an ejected electron?

[Ricky Ma DIS 4E]

Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 105 m.s-1. The work function for sodium is 150.6 kJ.mol-1.
Ek=0.5m.v^2
How do I find the mass of an ejected electron? Is it just the molar mass of sodium?

[Venya Vaddi 1L]

I think you have to use the mass of an electron, which is 9.10938356 × 10^-31 kilograms.

[Chem_Mod]

The mass of the electron is a constant (see previous answer), but this will be given to you on the formula sheet. Electrons have the same mass, regardless of what element they belong to.

[John Kim Lec3Dis3L]

As the other posters said, electrons do not change their mass. For this class, you can just use 9.10938E-31 kg as your mass; any more accuracy would probably be overkill for our level of academia.