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Element X is a radioactive isotope such that every 66 years, its mass
decreases by half. Given that the initial mass of a sample of Element X is 240
grams, how much of the element would remain after 20 years, to the nearest
whole number?

Respuesta :

jorel1380

Answer:

194.5315427 grams

Step-by-step explanation:

The half-life of element x would be 66 years. So, after 20 years you would have:

.5^(20/66) x 240=0.810548 x 240

        =194.5315427 grams of the element left ......

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