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$\mathrm{A} 1.00 \times 10^{-6}-\mathrm{g}$ sample of nobelium, 254 $\mathrm{No}$ has a half-life of 55 seconds after it is formed. What is the percentage of $\frac{254}{102}$ No remaining at the following times? (a) 5.0 min after it forms(b) 1.0 $\mathrm{h}$ after it forms

a) 2.3$\%$b) $2.0 \times 10^{-18} \%$

Chemistry 102

Chapter 21

Nuclear Chemistry

University of Central Florida

Drexel University

Brown University

University of Toronto

Lectures

03:07

A liquid is a nearly incom…

04:38

A liquid is a state of mat…

01:19

Nobelium, an element disco…

01:48

(II) A sample of $\frac{23…

04:05

(II) A sample of $^{233}_{…

02:04

The isotope 208 Tl undergo…

05:32

(II) Calculate the mass of…

03:12

The half-life of $^{27} \m…

03:36

05:22

07:27

A certain substance $X$ de…

02:20

A nuclide has a decay rate…

01:15

After 44 minutes, a sample…

01:49

The radionuclide $^{64 } \…

02:02

The number of radioactive …

01:10

Use the half-life informat…

06:51

A sample of radioactive $_…

(II) $^{124}_{55}$Cs has a…

08:44

Almost all of naturally oc…

03:04

Consider an initially pure…

06:42

A 12.0-g sample of carbon …

01:13

$^{211}_{86}$ $\mathrm{Rn}…

for Party considered the sample. The half life off sample is 55 seconds. Substituting the half life on the value off Lambda On substituted the half life into the relation off Lambda, which gives us 0.1 to 6 seconds. Now the time is five minutes converted. The time into second by by a correlation that is one minute is equal to 60 seconds. Substitute zero point 1 to 6 per second for Lambda on 300 seconds for time. It gives us the ratio off and buy n no equal to 0.0. Don't do it, so the percentage left is 23% for part B. Now the time is one hour convert this time, and by the using correlation, one hour is equal to 3600 seconds. Now the time is 3600 seconds. The issue off initial amount and no Andi. Among in time. We can substitute this substance, substituting this value. We have the ratio, which turns out to be 2.0 into attendance upon minus 20 so the person dates can be calculated. Richly. Witches 2.0 in tow tend a super minus 18 by a

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