Answer
$5.00\times10^{3}\,J/K$
Work Step by Step
$\Delta S_{surr}=\frac{-\Delta H_{sys}}{T}=\frac{-\Delta H^{\circ}_{rxn}}{T}=\frac{-(-385\,kJ)}{77\,K}$
$=\frac{385\times10^{3}\,J}{77\,K}=5.00\times10^{3}\,J/K$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.