A neutron-induced fission of uranium is represented as

CHEMISTRY · Multi-part · US High School · Chemistry · Atomic Structure & Nuclear · Atomic Structure & Nuclear

Problem

^{235}_{92}\mathrm{U} + ^{1}_{0}\mathrm{n} \;\rightarrow\; ^{140}_{54}\mathrm{Xe} + X + 2\,^{1}_{0}\mathrm{n}

(i) Determine the mass number and atomic number of nucleus

X

, and hence write its symbol. (ii) Using the atomic masses given below, calculate the

Q

-value of the fission reaction.

^{235}_{92}\mathrm{U}:\;235.043929\,\text{u}

^{140}_{54}\mathrm{Xe}:\;139.921610\,\text{u}

^{94}_{38}\mathrm{Sr}:\;93.915356\,\text{u}

^{1}_{0}\mathrm{n}:\;1.008665\,\text{u}

(Use

1\,\text{u}=931.5\,\text{MeV}