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A sample of rock was found to contain 8.23 $\mathrm{mg}$ of rubidium- 87 and 0.47 $\mathrm{mg}$ of strontium- 87 (a) Calculate the age of the rock if the half-life of the decay of rubidium by $\beta$ emission is $4.7 \times 10^{10} \mathrm{y} .$ (b) If some $\frac{87}{38} \mathrm{Sr}$ was initially present in the rock, would the rock be younger, older, or the same age as the age calculated in $(\mathrm{a})$ ? Explain your answer.

a) 3.8 billion yearsb) the rock would be younger than what is calculated.

Chemistry 102

Chapter 21

Nuclear Chemistry

Carleton College

Rice University

University of Toronto

Lectures

03:07

A liquid is a nearly incom…

04:38

A liquid is a state of mat…

01:48

Rubidium- 87 decays by $\b…

01:58

(II) Rubidium-strontium da…

05:11

(II) $\textbf{Rubidium-str…

02:28

(Continuation of Exercise …

04:50

In a piece of rock from th…

02:31

Uranium dating Uranium- 23…

03:16

Different radioisotopes ha…

01:17

A laboratory investigation…

04:21

01:30

Given that the half-life o…

03:51

00:47

A technique to date geolog…

00:59

When a sample from a meteo…

02:13

Geologists can estimate th…

05:03

A rock contains $0.688 \ma…

Cesium-137, a beta emitter…

08:09

A rock sample contains tra…

02:01

Designing exponential deca…

00:41

Isotopes such as $^{26} \m…

06:32

um, the age of substance. It's calculated by using the formula. There is a girl to one of one Lambda Natural Local and one upon him. Sexual. Um, considering the reaction, it day seven could be damn 37 forms. 87 strong shells, 38 plus electrons minus when the decay constant is calculated as Lambda is a girl toe national love off. Two off 20 half. There is a natural love off to have want They have serious 4.7 into 10 to the power then. But yeah, there is a record toe 1.47 into 10 to the power minus seven. Yeah, it can be assumed that all the storage room there is formed is because of the decomposition off rubidium. So, for each more astonishing produced, one more off the goddamn had tau bay to composed. Does initial in issue number off malls off rope idiom is equally too number off. Molds off radium left blood number off. Morals off transition. That is a good do. 8.23 tend to depart minus 3 g upon 87 g by most multiply. Plus, they were 0.47 inches. Tend to depart minus 3 g 1 87 g. We're more that is a girl toe 9.96 into 10. 34 minus five more. No substituted. Do't 10 to the power for substitute. Tend to depart minus four years for and zero the 9.46 into tend to depart minus five years before. For anyone? Uh huh. And so, the empty and 1.47 into 10 to depart minus 11? Yes, for Atlanta. In the expression there is a girl toe one upon Lambda. I shall love off on one upon him. Zale Physical one upon 1.47 into 10 to depart, minus 11. 4 years say for yeah, but yeah. Natural law off identity par minus four years upon 9.4 16 to tend to the par minus five. Yes, is a tow 3.18 to 10 to the power nine. Yes, therefore, for age off, the rock is three point hit into 10. 24 9. Yes, there is three pointed billion years. Uh, second And the age off the rock would be younger than that joke arugula generate. If there was some initial amount off. Yeah, age off. the rock would be younger then. The actual calculated age if there was some in the shell amount off stranger present. When there present when the rock waas fund This is because, um, time is directly proportional to the amount off John Jim tranche. Um, if the rock had some if the rock heads some amount off tranche, um, initially, then the amount off strong Geum that is observed minus the amount off John Sham. It initially had initially had the the the corresponding malls off radium. Radium. That good. They composed Yeah, producing, producing strong Jim. Therefore, the rock would the younger then what is calculate?

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