200. In the nuclear reaction ${}^{137}_{55}\text{Cs} \rightarrow {}^{137}_{56}\text{Ba} + X$, the mass difference is $0.005\ \text{u}$ and each atomic mass unit equals $1.7\times10^{-27}$ kilograms. $X$ is which particle and how many joules of energy is released? \[
\left(C = 3\times10^{8}\ \frac{\text{m}}{\text{s}}\right)
\] \[
\text{(1)}\ e^{-},\ 5.1\times10^{-22} \qquad \text{(2)}\ e^{+},\ 5.1\times10^{-22}
\] \[
\text{(3)}\ e^{-},\ 1.53\times10^{-13} \qquad \text{(4)}\ e^{+},\ 1.53\times10^{-13}
\] [Calculation space] %% Page 19 Chemistry 120-C Page 18
\textbf{200.} In the nuclear reaction ${}^{137}_{55}\text{Cs} \rightarrow {}^{137}_{56}\text{Ba} + X$, the mass difference is $0.005\ \text{u}$ and each atomic mass unit equals $1.7\times10^{-27}$ kilograms. $X$ is which particle and how many joules of energy is released?
\[
\left(C = 3\times10^{8}\ \frac{\text{m}}{\text{s}}\right)
\]
\[
\text{(1)}\ e^{-},\ 5.1\times10^{-22} \qquad \text{(2)}\ e^{+},\ 5.1\times10^{-22}
\]
\[
\text{(3)}\ e^{-},\ 1.53\times10^{-13} \qquad \text{(4)}\ e^{+},\ 1.53\times10^{-13}
\]
\bigskip
\hfill \textit{[Calculation space]}
%% Page 19
\textbf{Chemistry \hfill 120-C \hfill Page 18}