Final answer:
The molecules are spaced farthest apart in a gas.
Step-by-step explanation:
The state of matter in which the molecules are spaced farthest apart is Gas.
In a gas, the molecules have a lot of energy and are not held together tightly. They move freely and quickly in all directions, and there is a lot of empty space between them.
In contrast, in a solid, the molecules are tightly packed together, while in a liquid, they are closer compared to a gas but still more spread out than in a solid. Therefore, the molecules are spaced farthest apart in a gas.
Learn more about states of matter