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
How many grams are in 3.93 x 10^24 molecules of CCl4?
Lorico [155]
<h3>Answer:</h3>

1000 g CCl₄

<h3>General Formulas and Concepts:</h3>

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

<u>Chemistry</u>

<u>Atomic Structure</u>

  • Reading a Periodic Table
  • Using Dimensional Analysis
  • Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.
<h3>Explanation:</h3>

<u>Step 1: Define</u>

3.93 × 10²⁴ molecules CCl₄

<u>Step 2: Identify Conversions</u>

Avogadro's Number

Molar Mass of C - 12.01 g/mol

Molar Mass of Cl - 35.45 g/mol

Molar Mass of CCl₄ - 12.01 + 4(35.45) = 153.81 g/mol

<u>Step 3: Convert</u>

  1. Set up:                              \displaystyle 3.93 \cdot 10^{24} \ molecules \ CCl_4(\frac{1 \ mol CCl_4}{6.022 \cdot 10^{23} \ molecules \ CCl_4})(\frac{153.81 \ g \ CCl_4}{1 \ mol \ CCl_4})
  2. Multiply:                                                                                                             \displaystyle 1003.77 \ g \ CCl_4

<u>Step 4: Check</u>

<em>Follow sig fig rules and round. We are given 3 sig figs.</em>

1003.77 g CCl₄ ≈ 1000 g CCl₄

8 0
3 years ago
Please help explain and don't answer if you don't know. thank you
ipn [44]

Answer:

The group 18 elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). These elements are non-reactive and are called noble gases as they have their outermost orbit complete. Due to stable electronic configuration they hardly react with other elements.The name comes from the fact that these elements are virtually unreactive towards other elements or compounds.The group 18 elements are called noble or inert gases. As the name suggests these are inert because chemically they are very less reactive or not at all reactive.The full valence electron shells of these atoms make the noble gases extremely stable.

5 0
3 years ago
Smartphone batteries contain a casing that surrounds it that is made up out of aluminium. What would best describe the propertie
Vladimir79 [104]

Answer:

it contains the electricity of the battery

Explanation:

6 0
3 years ago
Why can strong winds lead to more flooding during Hurricane
VikaD [51]

All tropical cyclones can produce widespread torrential rains, which cause massive flooding and trigger landslides and debris flows.

8 0
3 years ago
In the reaction Fe2O3 + 3CO a 2Fe + 3CO2, 10 moles of solid iron and 15 moles of carbon dioxide are produced from 5 moles of iro
Schach [20]

Answer:

Ratio is 3:2

3CO = 2Fe or 1.5 CO = 1 Fe

Explanation:

Fe2O3 + 3CO = 2Fe + 3CO2

Fe2O3 = Iron (|||) oxide

CO = Carbon monoxide

Fe = Solid Iron

CO2 = Carbon dioxide

Excellent is already balanced.

10 Moles Fe and 15 Moles of CO2

5 Moles Fe2O3 + 15 Moles 3CO = 10 Moles Fe + 15 Moles 3CO2

What is the ratio of carbon monoxide to solid iron

Ratio is 3:2 or 1.5 CO = 1 Fe

5 0
3 years ago
Other questions:
  • How many liters of water vapor can be produced if 8.9 liters of methane gas (CH4) are combusted, if all measurements are taken a
    12·1 answer
  • The law of reflection states that the angle of incidence equals the angle of reflection. Define the angle of incidence in terms
    13·1 answer
  • 4. What coefficients need to be added to the following chemical reaction
    15·1 answer
  • How does distillation separate a solvent from a solute?
    12·1 answer
  • What are 2 things that a ROOT does for plants?
    10·2 answers
  • WHAT DID YOU OBSERVE HAPPENED WHEN AN S-WAVE TRAVELED INTO A LIQUID?
    9·1 answer
  • How are the terms atom and element different?
    6·2 answers
  • Calcium and sulfur Enter the ions formed by these elements and separate your answers with a comma (e.G., Sr2+,As3−).
    6·1 answer
  • 71. The density of osmium (the densest metal) is 22.57 g/cm². If a
    14·1 answer
  • Describe two carbon sequestering methods that could reduce the impact of deforestation
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!