Question

a 1-l soda bottle contains dissolved carbon dioxide gas. which bottle would have the highest concentration of dissolved gas?
○ a bottle that is sealed
○ a bottle that was opened 1 minute ago
○ a bottle that was opened 1 hour ago
○ a bottle that was opened 1 day ago

Explanation:

When a soda bottle is sealed, the system is in equilibrium with a relatively high partial pressure of $\ce{CO_2}$ above the liquid, keeping more $\ce{CO_2}$ dissolved. Once opened, $\ce{CO_2}$ escapes to the atmosphere (lowering the partial pressure above the liquid), and over time (1 minute, 1 hour, 1 day), more gas escapes, reducing the dissolved concentration. So the sealed bottle has the highest dissolved $\ce{CO_2}$ concentration.

Answer:

a bottle that is sealed