Answer
$49.81\%$
Work Step by Step
Reactants: $C_4H_{12}O_5SNaBr, 275.09\ g/mol$
Product: $137.02\ g/mol$
Atom economy: $137.02/275.09\times 100\%=49.81\%$
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.