Answer:
1.) 8.09g ; 2) 206.7 years
Step-by-step explanation:
Given the following :
Half-life(t1/2) of Uranium-232 = 68.9 years
a) If you have a 100 gram sample, how much would be left after 250 years?
Initial quantity (No) = 100g
Time elapsed (t) = 250 years
Find the quantity of substance remaining (N(t))
Recall :
N(t) = No(0.5)^(t/t1/2)
N(250) = 100(0.5)^(250/68.9)
N(250) = 100(0.5)^3.6284470
N(250) = 100 × 0.0808590
= 8.0859045
= 8.09g
2) If you have a 100 gram sample, how long would it take for there to be 12.5 grams remaining?
Using the relation :
N / No = (1/2)^n
Where N = Amount of remaining or left
No = Original quantity
n = number of half-lifes
N = 12.5g ; No = 100g
12.5 / 100 = (1/2)^n
0.125 = (1/2)^n
Converting 0.125 to fraction
(1/8) = 1/2^n
8 = 2^n
2^3 = 2^n
n = 3
Recall ;
Number of half life's (n) = t / t1/2
t = time elapsed ; t1/2 = half life
3 = t / 68.9
t = 3 × 68.9
t = 206.7 years
Answer: 14
Step-by-step explanation:
The mean absolute deviation of a dataset is defined as the average distance between each datav alue and the mean.
It is computed by formula:
average value of the data set
n = number of data values
= data values in the set
MAD=
=
=14
Hence, the mean absolute deviation of the set of data = 14
1, 4/2; 2, -5/4; 3, 7/5; 4, -7/4; 5, 3/5; 6, -2/8; 7, 6/2; 8, -2/4; 9, 1/6
(25.45-12.5)+12.45
25.45-12.5
=12.95
12.95+12.45
=25.4 Is your answer
^o^
Answer:
You are asking a question that cannot be solved by anyone outside of your school.
Step-by-step explanation:
What information is below?