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The mass variable (m) will change according to what particle/object is given. I'd say typically the particle will be an electron, who's mass is 9.1093 x 10^(-31) kg, so you can use that. But the question should let you know what particle is being observed, and you would use that particle's mass for the m variable.
Yea, it would be good to know the mass of an electron just as common chem knowledge, but I'm pretty sure he gave the mass of a proton, neutron and an electron on the last exam so you should generally be able to find the mass on the actual exam.
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