# Question Video: Using Avogadro’s Law to Recognize the Relationship Between the Volume and Number of Moles of a Gas

According to Avogadro’s law, what happens to the volume a gas occupies if the number of moles increases? [A] It stays the same. [B] It increases. [C] It decreases.

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### Video Transcript

According to Avogadro’s law, what happens to the volume a gas occupies if the number of moles increases? (A) It stays the same. (B) It increases. (C) It decreases.

Avogadro’s law states that, at a constant temperature and pressure, the volume and number of moles of a gas are directly proportional. This means that if the number of moles increases, the volume of the gas must also increase at a constant rate. To remember this relationship, we can think about blowing up a balloon. If we add more air to the balloon, we will increase the number of moles of gas and the balloon will inflate.

In returning to the question “What happens to the volume a gas occupies if the number of moles increases?” (B) it increases.