A student places a 12-gram cube of ice inside a container. After six hours, the student returns to observe the contents of the container. Which sentence suggests that the container is an open system?

The container contains 8 g of liquid water and no ice.  

Explanation:

An open system is a system that can exchange mass or energy with the environment.

If the total mass of the system after 6 h is different from 12 g, it must be an open system.

If the total mass of the system after 6 h equals 12 g, it must be a closed system.

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