Chemistry, 05.07.2019 06:30, heartprague

The half-life of radon-222 is 3.8 days. if a sample currently contains 3.1 grams of radon-222, how much radon-222 did this sample have 15.2 days ago? a 12.4 grams b 47.1 grams c 49.6 grams d 57.8 grams

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The half-life of radon-222 is 3.8 days. if a sample currently contains 3.1 grams of radon-222, how m...