The pressure will decrease.Explanation:If temperature and number of moles of gas remain unchanged, then increasing the volume will result in a decrease in pressure - this is known as Boyle's Law.In other words, when temperature and number of moles of are held constant, pressure and volume have an inverse relationship. If you increase one, the other decreases and vice versa.Gas pressure is actually caused by the collisions that take place between the gas molecules and the walls of the container.http://www.kidsgeo.com/geography-for-kids/0084-pressure-and-density.phpThe force with which the gas molecules hit the wall depends on their average kinetic energy, which is determined by the temperature of the gas.So, the more energetic and frequent the collisions between the molecules and the walls of the container are, the bigger the pressure.In your case, you have the same number of molecules and the same temperature, i.e. their average kinetic energy remains constant.If you increase the volume, you essentially give the molecules more room to move around in, which in turn will cause them to collide with each other and with the container walls less frequently.So, the molecules hit the walls with the same force, but they don't do so as often as they did when the volume was smaller #-># pressure decreases.

Introduction:
When a gas flows from a smaller container into a larger one, its pressure undergoes certain changes. To understand this process, let's consider the behavior of gases and examine the relationship between pressure and volume.

Gas Behavior:
Gases are composed of molecules that are in constant random motion. These molecules collide with each other and the walls of the container, creating pressure. The pressure of a gas is determined by the frequency and force of these collisions.

Pressure-Volume Relationship:
According to Boyle's law, the pressure of a gas is inversely proportional to its volume, assuming temperature and the amount of gas remain constant. This means that as the volume of a gas increases, its pressure decreases, and vice versa.

Flow of Gas:
When a gas flows from a smaller container into a larger one, it expands to fill the available space. As a result, the volume of the gas increases while the number of gas molecules remains constant. Therefore, based on Boyle's law, the pressure of the gas decreases.

Diagram:
To illustrate this process, consider two containers, A and B, connected by a valve. Initially, container A has a higher pressure than container B.

Container A:
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| Gas |
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| | |
| | |
| Valve | |
| | |
| | |
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Container B:
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| | |
| | |
| | |
| Gas | |
| | |
| | |
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Process:
1. Initially, the valve between the two containers is closed, and the gas in container A exerts a higher pressure.
2. When the valve is opened, the gas flows from container A to container B.
3. As the gas flows into container B, it expands to fill the larger volume.
4. Due to the increased volume, the pressure of the gas in container B decreases.
5. Eventually, the pressure in both containers equalizes as the gas continues to flow and distribute itself evenly.

Conclusion:
When a gas flows from a smaller container into a larger one, its pressure decreases. This occurs because the gas expands to fill the larger volume, leading to a decrease in the frequency and force of molecular collisions, resulting in a lower pressure.