1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
serious [3.7K]
3 years ago
14

One of the radioactive isotopes used in medical treatment or analysis is chromium-51. The half-life of chromium-51 is 28 days. H

ow much time is required for the activity of a sample of chromium-51 to fall to 12.5 percent of its original value
Chemistry
1 answer:
Goryan [66]3 years ago
7 0

Answer : The time required for decay is, 84 days.

Explanation :

Half-life of chromium-51 = 28 days

First we have to calculate the rate constant, we use the formula :

k=\frac{0.693}{t_{1/2}}

k=\frac{0.693}{28\text{ days}}

k=0.0248\text{ days}^{-1}

Now we have to calculate the time required for decay.

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant

t = time taken by sample = ?

a = let initial activity of the sample = 100

a - x = amount left after decay process  = 12.5

Now put all the given values in above equation, we get

t=\frac{2.303}{0.0248}\log\frac{100}{12.5}

t=83.9\text{ days}\approx 84\text{ days}

Therefore, the time required for decay is, 84 days.

You might be interested in
What value must be known if the accuracy of an experiment is to be determined​
andrezito [222]

To evaluate the accuracy of a measurement, the measured value must be compared to the correct value. To evaluate the precision of a measurement, you must compare the values of two or more repeated measurements.
7 0
3 years ago
What type of chemist studies how materials conduct electricity?
e-lub [12.9K]

Explanation:

The study of interaction between the chemical substances is known as chemistry and the person who does this study is called a chemical scientist. Everything around us is made up of matter and the interaction between this matters for one or different substances.

Conduits lead electrical flow in all respects effectively as a result of their free electrons. Separators restrict electrical flow and make poor transmitters. Some basic channels are copper, aluminium, gold, and silver. Some regular encasing are glass, air, plastic, elastic, and wood.

3 0
3 years ago
Read 2 more answers
What are three ways invasive species can be introduced into an environment?
Naily [24]

Answer:

A

B

D

(:

Explanation:

6 0
2 years ago
What’s the best answer
Tasya [4]
B) 0.67
Hope this helped
8 0
3 years ago
a box contains 4 bags of sugar.the total mass of all 4 bags is 6kg.what is the mass of each bag in grams
andre [41]
The answer is 1.5kg because 6\4=1.5
3 0
3 years ago
Read 2 more answers
Other questions:
  • In a cell protein synthesis is the primary function of
    9·1 answer
  • What is required in order to melt a network solid?
    11·1 answer
  • Compare the properties of metals and nonmetals.
    8·1 answer
  • What are the four main states of matter
    10·2 answers
  • A compound consists of 72.2% magnesium and 27.8% nitrogen by mass. what is the empirical formula
    6·1 answer
  • What is the density of hydrogen sulfide at 1.1 atm and 304K?
    5·1 answer
  • Where does vanillin come from?<br> PLEASE ANSWER
    8·1 answer
  • A mixture of 0.307 M Cl 2 , 0.465 M F 2 , and 0.706 M ClF is enclosed in a vessel and heated to 2500 K . Cl 2 ( g ) + F 2 ( g )
    14·1 answer
  • Match the following terms to their respective definitions:
    13·1 answer
  • How many grams of Mg0 are produced from 9.7g of MG
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!