The Environmental Protection Agency and health officials nationwide are concerned about the levels of radon gas in homes. The half-life of the radon-222 isotope is 3.8 days. If a sample of gas taken from a basement contains 1.3 g of radon-222, how much radon will remain in the sample after 4.94 days?

1. 0.726114

2. 0.23462

3. 0.113736

4. 0.125746

5. 2.83761

6. 0.198002

7. 0.116852

8. 0.163355

9. 0.0673271

10. 0.528065

Answer in units of g