Answer
See explanation below.
Work Step by Step
Only student 3's way of writting is valid.
In case of student 1, the product formed is not desired, and in student 2's, chlorine is added, which is not permissible.
Chemistry: The Molecular Nature of Matter and Change 7th Edition
by Silberberg, Martin; Amateis, Patricia
Published by
McGraw-Hill Education
ISBN 10:
007351117X
ISBN 13:
978-0-07351-117-7
Chapter 3 - Problems - Page 132: 3.54
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