Answer
Please see the work below.
Work Step by Step
We know that
$E=mc^2$
Now $\Delta m=\frac{E}{c^2}$
We plug in the known values to obtain:
$\Delta m=\frac{1.715\times 10^6J}{3.00\times 10^8\frac{m}{s}}=0.00572Kg=5.72g$
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