Distinguish the combined gas law from the ideal gas law.

• A. The combined gas law only applies to gases at constant pressure, while the ideal gas law uses the ideal gas constant R and applies to gases of any pressure.
• B. The combined gas law only applies to gases with a fixed number of moles, while the ideal gas law uses the ideal gas constant R and applies to gases with any number of moles.
• C. The combined gas law only applies to gases at constant volume, while the ideal gas law uses the ideal gas constant R and applies to gases of varying volumes.
• D. The combined gas law only applies to gases at a constant temperature, while the ideal gas law uses the ideal gas constant R and applies to gases at varying temperatures.

Answer: (B)