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Gala2k [10]
3 years ago
6

PLEASE HELP ME If a radioactive substance has an initial mass of 50 grams

Chemistry
1 answer:
Yuri [45]3 years ago
3 0

Answer: 3.125\ g

Explanation:

Given

Initial mass A_o=50\ g

half-life is T_{\frac{1}{2}}=5\ years

At any time the left amount is given by

A=A_o2^{-\dfrac{t}{T_{\frac{1}{2}}}}\\\\\text{Insert the values}\\\\A=50\cdot 2^{-\dfrac{20}{5}}\\\\A=50\cdot 2^{-4}\\\\A=\dfrac{50}{16}\\\\A=3.125\ g

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