Answer
$1.54\times 10^3\frac{J}{g}$
Work Step by Step
We know that
$\frac{686}{1lb}\times \frac{252cal}{1Btu}\times \frac{1lb}{0.4536Kg}\times \frac{1Kg}{10^3g}=1.54\times 10^3\frac{J}{g}$
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