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
Nady [450]
3 years ago
11

The half-life of radium-226 is 1590 years. if a sample contains 100 mg, how many mg will remain after 1000 years?

Chemistry
1 answer:
AlladinOne [14]3 years ago
7 0

Answer:

64.52 mg.

Explanation:

The following data were obtained from the question:

Half life (t½) = 1590 years

Initial amount (N₀) = 100 mg

Time (t) = 1000 years.

Final amount (N) =.?

Next, we shall determine the rate constant (K).

This is illustrated below:

Half life (t½) = 1590 years

Rate/decay constant (K) =?

K = 0.693 / t½

K = 0.693/1590

K = 4.36×10¯⁴ / year.

Finally, we shall determine the amount that will remain after 1000 years as follow:

Half life (t½) = 1590 years

Initial amount (N₀) = 100 mg

Time (t) = 1000 years.

Rate constant = 4.36×10¯⁴ / year.

Final amount (N) =.?

Log (N₀/N) = kt/2.3

Log (100/N) = 4.36×10¯⁴ × 1000/2.3

Log (100/N) = 0.436/2.3

Log (100/N) = 0.1896

Take the antilog

100/N = antilog (0.1896)

100/N = 1.55

Cross multiply

N x 1.55 = 100

Divide both side by 1.55

N = 100/1.55

N = 64.52 mg

Therefore, the amount that remained after 1000 years is 64.52 mg

You might be interested in
3 Points
svp [43]

Answer:

C. Splitting the atom

Explanation:

splitting the atom involves fission

4 0
3 years ago
Read 2 more answers
Can you give examples of carbon in our living environment?
sveticcg [70]
Wastes
Fuel
Smoke
Gas
Toxic chemicals
5 0
3 years ago
Read 2 more answers
What is the difference between a strong acid and a weak acid?
chubhunter [2.5K]
Strong Acid has a lower pH level than a weak acid, weak acid pH level will be closer to 7 than the strong acid. Weak acid does not dissociate completely, therefore a weaker proton donor, thus higher pKa. Strong acids dissociates completely and release all of their hydrogen atom when dissolve in water.
7 0
3 years ago
If you have 0.50 mol of ca, how many atoms are present?
Evgen [1.6K]
Answer is: there are 3.011·10²³ atoms of calcium.

n(Ca) = 0.50 mol; amount of substance(calcium).
Na = 6.022·10²³ 1/mol;  Avogadro's constant or number.
N(Ca) = n(Ca) · Na.
N(Ca) = 0.50 mol · 6.022·10²³ 1/mol.
N(Ca) = 3.011·10²³; number of calcium atoms.
The mole is an SI unit which measures the number of particles in substance. One mole is equal to <span><span>6.022</span></span>·<span><span><span>10</span></span></span>²³<span> atoms.</span>
6 0
3 years ago
I just need answers please!!
otez555 [7]

Answer:

#1 is an organism

#2 is cell

#4 - Digestive System gets nutrients (good) from food and hands it over to the blood and Circulatory System then carries those nutrients where they need to go

4 0
3 years ago
Read 2 more answers
Other questions:
  • An experimental set up involves a cell with pumps that maintain high K+ and Cl- concentrations outside of the cell, and high Na+
    5·1 answer
  • Explain oxidation and reduction occur simultaneously​
    9·2 answers
  • In salt, what is the nature of the bond between sodium and chlorine? in salt, what is the nature of the bond between sodium and
    12·1 answer
  • In which group of the periodic table do you find alkali metals?<br><br>A. 8A<br>B.2A<br>C.1A<br>D.7A
    11·2 answers
  • 2) 3,160 tons of water flows over Niagra Falls every second. Assuming the water has a density of 1.00 g/ml,
    11·1 answer
  • According to the Lewis dot structure shown here how may valence electrons does chlorine have
    14·1 answer
  • Scientists must be curious, honest, creative open minded skeptical , ethical and aware of bias. list 3 ways thinking like a scie
    12·1 answer
  • How can you use the periodic table to find the number of protons in one atom of an element?
    9·1 answer
  • Describe particle movement in solid,liquid and gas
    7·2 answers
  • Which choice best explains why a low-pressure system and a high-pressure system create different weather conditions?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!