You observe that carbon dioxide sublimes. Which of the following statements about the signs of this process is/are true?
I) Work (w) is positive.
II) Heat (q) is negative.
III) Change in Gibbs free energy (∆G) is positive.
IV) Change in entropy (∆S) is positive.
1. I and II
2. II and III
3. I, II and III
4. I only
5. IV only
6. III and IV
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