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
hram777 [196]
3 years ago
11

An element has two naturally-occurring isotopes. The mass numbers of these isotopes are 113 amu and 115 amu, with natural abunda

nces of 5% and 95%, respectively. Calculate its average atomic mass. Report your answer to 1 decimal place.
Chemistry
1 answer:
DENIUS [597]3 years ago
5 0

Answer: Its average atomic mass is 114.9 amu

Explanation:

Mass of isotope 1 = 113 amu

% abundance of isotope 1 = 5% = \frac{5}{100}=0.05

Mass of isotope 2 = 115 amu

% abundance of isotope 2 = 95% = \frac{95}{100}=0.95

Formula used for average atomic mass of an element :

\text{ Average atomic mass of an element}=\sum(\text{atomic mass of an isotopes}\times {{\text { fractional abundance}})

A=\sum[(113\times 0.05)+(115\times 0.95)]

A=114.9amu

Thus its average atomic mass is 114.9 amu

You might be interested in
Iron has a density of 7.86 g/cm3 (1 cm3=1 mL). Calculate the volume (in dL) of a piece of iron having a mass of 4.54 kg . Note t
lilavasa [31]
<span>The volume of iron is obtained from the density formula (density= mass/ volume) given the density and mass. In this case, 4,540 grams of iron and a density of 7.86 g/ml are given. The volume obtained from formula is 493.64 ml or 5.78 dL. </span>
8 0
2 years ago
Eddie is performing an experiment. He asked the question what type of soil makes plants grow the fastest. He has four plants. He
Bezzdna [24]
Manipulated variable: the types of soil
Responding variable: how much t the plants grow
4 0
3 years ago
Write a net ionic equation for the reaction between mno4- and fe2+ in acid solution
dedylja [7]
Answer : The complete net ionic reaction between MnO _{4}  ^{-} and Fe ^{2+} in an acid solution, can be written as :-

MnO _{4}  ^{-}  + 5Fe ^{2+} + 8 H ^{+} ----\ \textgreater \  Mn ^{2+} + 5 Fe^{3+} + 4 H _{2}O.
6 0
3 years ago
What does Einstein’s theory of relativity expalain?
anygoal [31]

Answer:

The correct answer is D. How gravity interacts with planets

Explanation:

Einstein's theory of relativity formulated in 1915 introduces the following concepts:

- Formula E = mc2 (relationship between energy, mass, speed of light)

- How nuclear energy is produced

-After seeing a solar eclipse, gravity is interpreted geometrically (which is an effect of distortion)

-Relative time

8 0
3 years ago
Refraction occurs when the speed of light changes as it travels between mediums.<br><br><br> T<br> F
Mariana [72]

The answer is true

Refraction is an effect that occurs when a light wave, incident at an angle away from the normal, passes a boundary from one medium into another in which there is a change in velocity of the light.The wavelength decreases as the light enters the medium and the light wave changes direction.

5 0
3 years ago
Other questions:
  • Which shows an electron being ejected from the atom? explain your reasoning?
    10·1 answer
  • Exactly 5.00 L of air at -50.0°C is warmed to 100.0°C. What is the new volume if the pressure remains constant?
    13·1 answer
  • which of the following is true ? soil forms from weathered rocks and organic materials. fertile soil usually forms in areas with
    5·1 answer
  • Una piedra es lanzada horizontalmente desde la azote de un edificio de 30 metros de altura, con una velocidad de 12 m/s. Hallar
    15·1 answer
  • Describe the ways that energy is conventes
    9·1 answer
  • Amy throws a softball through the air. What are the different forces acting on the ball while it’s in the air?
    14·2 answers
  • A sample of CO₂ solid and a sample of CO₂ gas differ in their
    15·1 answer
  • True or false Cellular Respiration produces Glucose, Water, and ATP?
    8·2 answers
  • Help me real quick !!
    13·1 answer
  • What specialized plant structures increase the probability of successful reproduction?
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!