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minutes of videosA sample of helium effuses through a porous container 7.70 times faster than does unknown gas X. What is the molar mass of the unknown gas?

1. 129.96

2. 153.76

3. 169.0

4. 112.36

5. 190.44

6. 237.16

7. 275.56

8. 392.04

9. 201.64

10. 368.64

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