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A sealed, rigid cylinder is filled with 10 mL of oxygen gas at 25°C and a pressure of 1.00 atm. The temperature is then doubled. How do the number of molecules of gas before the increase in temperature compare to the number of molecules after the temperature is increased?

Answer :

The number of molecules of gas remain the same. Since the container is sealed and rigid, none of the gas molecules can exit the container as the temperature is increasing. The increase in temperature would just cause an increase in pressure.

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