A single 212 Po nucleus, initially at rest, emits an alpha particle as it decays into a 208 Pb nucleus. There are no other decay

Question

A single 212 Po nucleus, initially at rest, emits an alpha particle as it decays into a 208 Pb nucleus. There are no other decay products, and the kinetic energy of the alpha particle is measured to be 1.407 × 10-12 J. 
The mass of an alpha particle is 4.0026 u. The mass of a 208 Pb nucleus is 207.98 u. The speed of light is 2.998 x 108 m/s. What is the total amount of nuclear potential energy APEnuclear, in joules, that was released in this process?

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