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Posted: **Tue May 17, 2022 8:24 am**

: Question 4 Type Pa Gaseous Radon 222 Forms In Soil As It Rises From The Soil It Can Be Trapped In Basements Below Ho 1 (37.06 KiB) Viewed 46 times

: Question 4 Type Pa Gaseous Radon 222 Forms In Soil As It Rises From The Soil It Can Be Trapped In Basements Below Ho 2 (20.24 KiB) Viewed 46 times

Question 4 Type = Pa Gaseous Radon-222 forms in soil. As it rises from the soil, it can be trapped in basements below homes. This gas, an alpha emitter, decays into Po-218, once inhaled by people it can cause lung cancer. A sample of gas is tested for Rn-222. The 1/2 life of Rn-222 is 3.823 days. After 63 days the sample is found to contain 2.62x10-8 g of Rn-222. Par 15 poin. How many grams of Rn-222 were initially present? 8 How many grams of Po-218 have been formed? 8

Question 6 Type nun A laboratory investigation shows that a sample of uranium ore contains 8.64 mg of 238U (molar mass 238.05079 g/mol) and 1.78 mg of 206Pb (molar mass 205.97447 g/mol). Calculate the age 10 points of the ore. The half-life of 238 U is 4.5*109 yr. 82 92 yr