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
tatiyna
3 years ago
8

Potassium is isotopic and has RAM of 39.5 work out the percentage abundance of each isotope in a given sample of potassium which

is found to contain 3 isotopes of K-39, K-40 and K-38 with the abundance of K-38 being 0.01%
Chemistry
1 answer:
Troyanec [42]3 years ago
3 0

Yo sup??

Let the percentage of K-39 be x

then the percentage of K-40 is 100-(x+0.01)

We know that the net weight should be 39.5. Therefore we can say

(39*x+40*(100-(x+0.01))+38*0.01)/100=39.5  

(since we are taking it in percent)

39*x+40*(100-(x+0.01))+38*0.01=3950

39x+4000-40x-0.4+0.38=3950

2x=49.98

x=24.99

=25 (approx)

Therefore K-39 is 25% in nature and K-40 is 75% in nature.

Hope this helps.

You might be interested in
If the Earth moved farther away from the sun, which of these would probably happen?
Margaret [11]
The climate would become colder...
7 0
3 years ago
Read 2 more answers
9, What is an Independent
stepan [7]

Answer:

Not influenced or controlled by others in matters of opinion

8 0
3 years ago
Please help me I can’t figure it out
lukranit [14]
The answer is A. because as you can see it pulls the force
8 0
3 years ago
If 75 grams of oxygen react, how many grams of aluminum are required?
german

Answer:

84.24 g

Explanation:

Given data:

Mass of oxygen = 75 g

Mass of Al required to react = ?

Solution:

Chemical equation:

4Al + 3O₂     →   2Al₂O₃

Number of moles of oxygen:

Number of moles = mass/ molar mass

Number of moles = 75 g/ 32 g/mol

Number of moles = 2.34 mol

Now we will compare the moles of oxygen with Al.

                          O₂         :          Al

                           3          :             4

                        2.34        :         4/3×2.34 = 3.12 mol

Mass of Al required:

Mass = number of moles × molar mass

Mass = 3.12 mol × 27 g/mol

Mass = 84.24 g

5 0
3 years ago
How many moles are in 22 grams of Argon
kakasveta [241]
The answer would be 0.55 moles! good luck!
4 0
3 years ago
Read 2 more answers
Other questions:
  • Which solid is the most suitable in the space elevator cable
    7·1 answer
  • A flask containing neon gas is connected to an open-endedmercury manometer. The open end is exposed to the atmosphere, wherethe
    11·1 answer
  • The __________ would be of the most benefit when transporting goods from Spain to Italy.
    13·1 answer
  • What is the ph of a solution of 0.450 m kh2po4, potassium dihydrogen phosphate?
    10·1 answer
  • 50 points for 2 questions and brainliest! Please help!!!!
    10·1 answer
  • An atom has 24 protons, 22 electrons, and 28 neutrons. What is the IONIC CHARGE of the atom? *
    15·1 answer
  • Percent composition for Na2S
    10·1 answer
  • Explain how movements along faults generate earthquakes<br><br><br>​
    9·1 answer
  • Kelli and Jarvis are members of the stage crew for the Variety Show. Between acts, they must quickly move a Baby Grand Piano ont
    6·1 answer
  • Ima 5% glucose solution, how many grams of glucose would be present per 100mL
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!