\textbf{200-} In a nuclear reaction, 2 milligrams of mass is converted to energy. The energy produced is equivalent to how many kilowatt-hours? $\left(C = 3\times10^{8}\ \dfrac{\text{m}}{\text{s}}\right)$
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(1) $2.5\times10^{4}$ \hfill (2) $2.5\times10^{9}$ \hfill (3) $5\times10^{4}$ \hfill (4) $5\times10^{9}$
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\textbf{Calculation Space}
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\textbf{Chemistry} \hfill \textbf{120-C} \hfill \textbf{Page 16}