Answer
$9.0\times10^{13}\,J$
Work Step by Step
Mass $m=1.0\,g=1.0\times10^{-3}\,kg$
Speed of the light $c=3.0\times10^{8}\,m/s$
Energy $E=mc^{2}=1.0\times10^{-3}\,kg\times(3.0\times10^{8}\,m/s)^{2}$
$=9.0\times10^{13}\,J$
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