Calculate Energy Released in Radium-226 Decay

[hayowazzup]

Homework Statement

Radium-226 decays with a half-life of 1.60E3 years via the process:
Ra -> Rn + He + Energy

(Masses : Ra = 226.025403u, Rn = 222.017570u, He - 4.002603u)

How much energy, in MeV, is released in each decay?

Homework Equations

E= mc^2

The Attempt at a Solution

E of Ra - E of Rn - E of He = Energy released
Energy = mc^2 - mc^2 -mc^2
E = (226.025403)(3E+8)-(222.017570)(3E+8)-(4.002603)(3E+8)= 1568700J = 9.79E+24 = 9.79E+18 MeV ?

 

[malawi_glenn]

no, how many MeV is one u?