Answer to Question #280925 in General Chemistry for kkghfg

Question

The initial amount of the radioactive material B in a rock is determined to be 19.08 mg. Only 0.0038 g are left of B after 1,980 years. How much of the radioactive material B decayed? Express your final answer in four decimal places

Answer 1

0.0038g=3.8 mg

19.08mg -3.8 mg=15.28 mg=0.0153 g

15.28x100/19.08=80.0839%