Answer
C is the correct answer.
Work Step by Step
As two molecules of H$_2$S are necessary to react with one mole of SO$_2$, twice as many will be required. Figure C represents this.
Introductory Chemistry (5th Edition)
by Tro, Nivaldo J.
Published by
Pearson
ISBN 10:
032191029X
ISBN 13:
978-0-32191-029-5
Chapter 8 - Quantities in Chemical Reactions - Exercises - Problems - Page 274: 19
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