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
andriy [413]
4 years ago
6

The element antimony has an atomic weight of 122 and consists of two stable isotopes antimony-121 and antimony-123. the isotope

antimony-121 has a mass of 121 amu and a percent natural abundance of 57.3 %. the isotope antimony-123 has a percent natural abundance of 42.8 %. what is the mass of antimony-123?
Chemistry
1 answer:
grin007 [14]4 years ago
6 0

Answer:-  123 amu.

Solution:- The formula to calculate the average atomic mass of an atom is:

Average atomic mass = mass of first isotope(abundance of first isotope) + mass of second isotope(abundance of second isotope)

Note: The percent abundance is converted to decimals.

mass of Sb-121 is 121 amu and it's percent abundance is 57.3% and in decimal it is 0.573. Percent abundance of Sb-123 is 42.8% and in decimal it is 0.428. We are asked to calculate it's mass. The average atomic mass of Sb is given as 122.

Let's say the mass of Sb-123 is M and  plug in the values in the formula and do calculations:

122 = 121(0.573) + M(0.428)

122 = 69.333 + M(0.428)

On rearrangement:-

M(0.428) = 122 - 69.333

M(0.428) = 52.667

M=\frac{52.667}{0.428}

M = 123

So, the mass of Sb-123 is 123 amu.

You might be interested in
A solution is prepared by dissolving a
goldfiish [28.3K]

Answer:

119g

Explanation:

Just multiply

2.38% of 500 =

119 g

7 0
3 years ago
Read 2 more answers
Let's say that you were given the following
mezya [45]

Answer:

V2~0.4839M

Explanation:

We're going to use Boyles law to answer the question.

Boyle's law:

P1V1=P2V2

P1=151mmHg

P2=166mmHg

V1=0.532L

V2=?

V2=(P1 x V1)/P2

V2=(151 x 0.532)/166

V2~0.4839M

Hope it helps:)

8 0
3 years ago
Why do we experience the changing of the seasons on earth
iren2701 [21]

<u>Answer:</u>

Earth's axis and position around the sun.

<u>Explanation:</u>

Earth's tilted axis causes the seasons to change. Throughout the year, different parts of Earth acquire the Sun's most direct rays(Or heat) because of the orbital rotation of Earth. So, when the North Pole tilts toward the Sun, it's summer inside the Northern Hemisphere. And whilst the South Pole tilts towards the Sun, it is winter within the Northern Hemisphere and vise versa.

4 0
3 years ago
If 190dm of hydrogen gas collected at 20°c and 760mmHg .Calculate it's volume at stp (standard pressure=760mmHg
Andrei [34K]

Answer:

177.1 L

Explanation:

The excersise can be solved, by the Ideal Gases Law.

P . V = n . R . T

In first step we need to determine the moles of gas:

We convert T° from, C° to K → 20°C + 273 = 293K

We convert P from mmHg to atm → 760 mmHg = 1atm

1Dm³ = 1L → 190L

We replace: 190 L . 1 atm = n . 0.082 . 293K

(190L.atm) / 0.082 . 293K = 7.91 moles.

We replace equation at STP conditions (1 atm and 273K)

V = (n . R .T) / P

V = (7.91 mol . 0.082 . 273K) / 1atm = 177.1 L

We can also make a rule of three:

At STP conditions 1 mol of gas occupies 22.4L

Then, 7.91 moles will be contained at (7.91 . 22.4) /1 = 177.1L

3 0
3 years ago
What did you include in your response? Check all that apply.
Aliun [14]

Answer:

Without corals, the algae are not protected and cannot perform photosynthesis.

5 0
3 years ago
Read 2 more answers
Other questions:
  • Which statement is true about chloroplasts?
    11·2 answers
  • Which of the following is not a fossil fuel?<br><br> Natural Gas<br> Petroleum<br> Nitrogen<br> Coal
    11·2 answers
  • What is a compound?
    8·2 answers
  • What are the answers of the parts? All of them please.
    9·1 answer
  • What is an alloy consisting primarily of iron and carbon
    10·2 answers
  • Which image represents the step in mitosis when chromosomes condense and spindle fibers form?
    11·1 answer
  • Name the quantum number that specifies the size of an atomic orbital?​
    6·1 answer
  • Come People join meet let's enjoy<br><br>this is the code to join meet<br>pjv-ngby-iir​
    15·1 answer
  • For a concave mirror, incident light beams through C will reflect:
    8·1 answer
  • CH2CH3<br> CH3CH2-C-CH2CH3<br> CH3<br> what’s the IUPAC name?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!