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Question: 

The americium nucleus, ${^{241}_{95}\textrm{Am}}$, decays to a neptunium nucleus, ${^{237}_{93}\textrm{Np}}$, by emitting an alpha particle of mass 4.00260 u and kinetic energy 5.5 MeV. Estimate the mass of the neptunium nucleus, ignoring its recoil, given that the americium mass is 241.05682 u.

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

$237.04832\textrm{u}$

Giancoli 7th Edition, Chapter 26, Problem 44

(1:50)

Chapter 26, Problem 44 is solved.

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