Answer
$E = 2.0\times 10^{47}~J$
Work Step by Step
We can find the energy released by the explosion:
$E = mc^2$
$E = (0.80)(1.4)(m_{sun})~c^2$
$E = (0.80)(1.4)(1.989\times 10^{30}~kg)(3.0\times 10^8~m/s)^2$
$E = 2.0\times 10^{47}~J$
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