daniellarangel
Answered

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41. Suppose a laboratory has a 60 g sample of polonium-210. The half-life of polonium-210 is about 138 days.
a. How many half-lives of polonium-210 occur in 828 days?
b. How much polonium is in the sample 828 days later?
a. 6; 0.94 g
c. 6; 10 g
b. 7;0.47 g
d. 6; 4,140 g
ettings

Sagot :

a. 6 half-lives; 0.94 g remaining

828 / 138 = 6

60 x 0.5^6 = 0.9375
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