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The root mean square speed of nitrogen molecules in air at 20°C is 511 m/s in a certain container. If the gas is allowed to expand to twice its original volume, the root mean square velocity of nitrogen molecules drops to 325 m/s. Calculate the temperature after the gas has expanded.

1. 45.1°C

2. −45.1°C

3. 261°C

4. 347◦C

5. −347°C

6. −261°C

7. 154°C

8. −154°C