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
antiseptic1488 [7]
3 years ago
10

An undiscovered element has three naturally occurring isotopes of X-55, X-57, and X-58. Isotope X-55 has an abundance of 27.80 %

and isotope X-57 has an abundance of 44.39 %. What is the average mass of this element in amu?
Chemistry
1 answer:
Vika [28.1K]3 years ago
4 0

Answer: The average atomic mass of this elements is 56.7221 amu.

Explanation: The average atomic mass is the sum of the masses of its isotopes each multiplied by their natural abundances.

\text{average atomic mass}=\sum_{i=1}^{n}(mass)_i(\text{Fractional abundance})_i            .....(1)

\text{Fractional abundance}=\frac{\%\text{ abundance}}{100}

We are given 3 isotopes of an element.

For Isotope X^{55},

Mass = 55 amu

Fractional abundance = 0.2780

For isotope X^{57},

Mass = 57 amu

Fractional abundance = 0.4439

Total Fractional abundance = 1

For isotope X^{58},

Mass = 58 amu

Fractional abundance = Total abundance - abundances of the other isotopes

Fractional abundance = 1 - 0.7219

                                     = 0.2781

Now, putting all the values in equation 1, we get

\text{Average atomic mass}= (55 amu\times 0.2780)+(57 amu\times 0.4439)+(58 amu\times 0.2781)

Average atomic mass = 56.7221 amu.

You might be interested in
If 3.66•10^23 molecules of a substance have a mass of 24.31g, what is the molar mass of the substance?
BlackZzzverrR [31]
Answer is a I took the quiz
3 0
2 years ago
Read 2 more answers
How to do part (b)??
laila [671]

it has less tightly bound electrons, is able to lose electron easily as compare to metal B at it has 4 unpaired electron in 3d sub-shell.

3 0
3 years ago
Why is granite better then marble for a statue in a city centre
nasty-shy [4]
Granite is stronger, and it doesn't grow mold in the rain. It also looks better than marble and is easier to carve. 
5 0
3 years ago
Read 2 more answers
Please help! Will mark Brainliest!
Elina [12.6K]
The answer is D ya know
6 0
3 years ago
Read 2 more answers
Water circulates through Earth's water cycle by changing its _____.
iragen [17]
Water moved through the water cycle by changing its state. Think, for example, of water evaporating (liquid to gas), snow sublimating (solid to gas) or melting (solid to liquid), rain (gas to liquid), sleet (liquid to solid), or snow (gas to solid).

The answer would thus be A.
4 0
2 years ago
Read 2 more answers
Other questions:
  • Helppppppp is due for tomorrow
    15·2 answers
  • What is the name of CuCO3 ???
    7·1 answer
  • A solution contains 225 g of sodium chloride, NaCl, dissolved in enough water to make a 0.25 L of solution. What is the molarity
    12·1 answer
  • Calculate the molar mass of a compound from the following information. You find that the freezing point of benzene is 5.5 degree
    5·1 answer
  • A 0.133 pg sample of iron-59 produces 242 β-particles per second. what is the half-life of this isotope (in hours)
    13·1 answer
  • Ameaba is which protozoan​
    9·2 answers
  • If a person burns 2171 Cal each day, how much energy (kJ) does she burn in 2 days?
    11·1 answer
  • PLEASE HELP!!!!
    14·1 answer
  • BRAINLIST IF U ARE CORRECT AND ANSWER ALL OF THEM!!!!!!!!!!Match the name of the way water is used to its description.
    6·2 answers
  • The gas in an aerosol can is at a pressure of 3.16 atm at 32.2°C. What would the gas pressure in the can be at 22.9°C?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!