Answer
$-331.9\frac{J}{K}$
Work Step by Step
We know that
$\Delta S=\Sigma nS(products)-\Sigma nS(reactants)$
We plug in the known values to obtain:
$\Delta S=(126.8)-(197.5+2\times 130.6)$
$\Delta S=-331.9\frac{J}{K}$
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