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Chapter 42: Q 18 Exercise (page 1236)

The barium isotope 131Ba has a half-life of 12 days. A 250 渭mg

sample of 131Ba is prepared. What is the mass of 131Ba after

(a) 1 day, (b) 10 days, and (c) 100 days?

Short Answer

Expert verified

Therefore, the mass is

a.)N=236渭gb.)N=140渭驳c.)N=0.775渭驳

Step by step solution

01

Given information

No=250渭gt1/2=12days

02

Explanation (a)

(a)After one day, we will determine N's value:

N=No12t/t1/2N=(250渭g)121day/12daysN=(250渭g)120.0833N=236渭g

03

Explanation (b)

(b)After 10 day, we will determine N's value

N=No12t/t1/2N=(250渭g)1210days/12daysN=(250渭g)120.833N=140渭g

04

Explanation (c)

(c)The N's value after 100 days:

N=No12t/t1/2N=(250渭g)12100days/12daysN=(250渭g)128.33N=0.775渭g

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