Cliffs AP Chemistry, 3rd Edition

(d) Restatement: Calculate binding energy (kJ/mole) of^22688 Ra.

∆E 900 10...

1

1 860

g kJ mole 167 10

g

kJ/mole

#^1011

==##

(e) Given^22688 Ra hast 12 /=162 10. #^3 yr.

Restatement: Rate constant for^22688 Ra.

.

k..

yr

yr

162 10

0 693 428 10

3

4

#

==# -

(f) Restatement: Fraction of^22688 Rathat remains after 100.0 yr.

...

.

lnxx kt

e xx

4 28 10 yr 100 0yr 4 28 10

. 104

0 41 2

0 0428 0

== ###=

==

-- -

fraction remaining: xx 0 == = 104.^1 0 962 96 2..%

Nuclear Chemistry