Answer
$2SO_{2}(g)+O_{2}(g)\ -->\ 2SO_{3}(g)$
Work Step by Step
Write the equation without coefficients. Add a coefficient of two to the sulfur dioxide and sulfur trioxide so that there is 6 oxygen and 2 sulfur on each side.
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.