Answer
The system can be closed by blocking the flow.
Work Step by Step
If no solution an enter or leave the flask then the system is closed because no mass can be exchanged with the surroundings.
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 5 - Thermochemistry - Exercises - Page 204: 5.20b
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