Answer
Four CO molecules.
Work Step by Step
Since there are four molecule of CH$_3$OH in the product, there should also be four molecules of CO to provide the necessary starting atoms of C and O to the final product
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 3 - Chemical Reactions and Reaction Stoichiometry - Exercises - Page 112: 3.2a
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