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
Anton [14]
2 years ago
5

Bromine has isotopes with mass numbers 79 and 81. if average relative atomic mass is 79.908 calculate the percentage of each iso

tope present
Chemistry
1 answer:
NeX [460]2 years ago
8 0

If the abundance of the first isotope is x, the abundance of the second isotope is 1-x.

Substituting into the atomic mass formula,

79.908=79x+81(1-x)\\\\79.908=81-2x\\\\-1.092=-2x\\\\x=0.546

This means the abundance of Bromine-79 is 54.6%, and the abundance of Bromine-81 is 45.4%.

You might be interested in
You are able to observe the release of energy in forms of what?
Vsevolod [243]
A.) Heat, light, or sound.
4 0
4 years ago
What is the answer for this please ?<br> HNO3 + OH →
BartSMP [9]

Answer:

HNO3(aq) + OH-(aq) → NO3-(aq) + H2O(l)

Explanation:

According to Bronsted-Lowry theory, an acid is a substance that donates a proton (H+) and produces a conjugate base while a base is a molecule or ion which accepts the proton.

An example of Bronsted-Lowry acid and base is Nitric acid, HNO3 and hydroxide ion, OH- respectively as shown in the given reaction.

Thus, the nitric acid acts as an acid by donating a proton to the hydroxide ion which accepts it, thus producing nitrate ion, NO3- as a conjugate base, while OH- produces H2O as a conjugate acid.

8 0
3 years ago
Write net ionic equations for the reactions that take place when aqueous solutions of the following substances are mixed: a. sod
strojnjashka [21]

Answer:

A. H₃O⁺ + CN⁻ → H₂O + HCN

B. OH⁻ + NH₄⁺ → NH₃ + H₂O

C. CN⁻ + NH₄⁺ → HCN + NH₃

D. HSO₄⁻ + CH₃COO⁻ → SO₄²⁻ + CH₃COOH

E. ClO⁻ + NH₃ → NO REACTION

Explanation:

Part A.

Sodium cyanide consist of Na⁺ and CN⁻ ions. CN⁻ is a conjugate base and accept H⁺ ion from nitric acid to form HCN (hydrogen cyanide).

Part B.

Ammonium chloride consist of NH₄⁺ and Cl⁻ ions. Sodium hydroxide is a strong base dissociate completely in solution convert into ammonium hydroxide and sodium chloride.

Part C.

Sodium cyanide consist of counter ion Na⁺ . CN⁻ combined with ammonium bromide to form ammonium cyanide and sodium bromide.

Part D.

Potassium hydrohen sulphate consist of potassium counter and hydrogen sulphate ion. Hydrogen sulphate combined with acetate ion to form acetic acid and sulphate ion.

Part E.

There have no reaction because hypochlorite and ammonia both are bases.

8 0
4 years ago
25 POINTS TO WHOEVER CAN FILL THIS OUT! Radioactivity Decay
Degger [83]

Answer:

how long?

Explanation:

3 0
4 years ago
Help me fill this out please, i give brainliest
xxTIMURxx [149]

Answer:

Okay, Left top= waning gibbous

left second= new moon

left third= third quarter

left fourth= waxing crescent

right top= Waning crescent

right second= first quarter

right third= full moon

right fourth= Waxing gibbous

hope you do good :)

4 0
3 years ago
Read 2 more answers
Other questions:
  • What kind of fossil fuel is hydrocarbon
    5·1 answer
  • CS2 (s) + 3 O2 (g) → CO2 (g) + 2 SO2 (g)
    7·1 answer
  • 5) List two traits that are heritable:<br> 6) List two traits that are not heritable:
    15·1 answer
  • How many milliliters of juice are in this graduated cylinder?
    9·2 answers
  • Which of the following reactions would be classified as oxidation-reduction? Check all that apply. View Available Hint(s) Check
    6·1 answer
  • 9. The particles that are lost, gained, or shared in chemical reactions
    11·1 answer
  • PLEASE HELP! EITHER AN ACCURATE ANSWER OR FORMULA IS HELPFUL! I HAVE LIMITED TIME!!!!
    11·1 answer
  • 22.4L of hydrogen gas at STP contains how many molecules
    12·1 answer
  • In micelles: Question options: A) non-polar ends form hydrophilic interactions with water. B) polar ends form hydrophobic intera
    8·1 answer
  • Which of the following describes a characteristic of water that helps it in dissolving a wide range of chemicals and biomolecule
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!