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boyakko [2]
2 years ago
14

calculate the average atomic mass of lead based on the given data and the atomic masses. isotope atomic mass (amu) percent abund

ance pb-206 205.97 14.5 pb-207 206.98 17.0 pb-208 207.98 68.5
Chemistry
1 answer:
BaLLatris [955]2 years ago
8 0

The average atomic mass of lead given its three isotopes is 207.52.

<h3>What is average atomic mass?</h3>

Average atomic mass is the weighted average of the atomic masses of the naturally occurring isotopes of an element.

According to this question, the following isotopes with their percent abundance and atomic masses of lead are given:

  • Pb-206 - 205.97 14.5%
  • Pb-207 - 206.98 17.0%
  • Pb-208 - 207.98 68.5%

  • Pb-206 = 14.5/100 × 205.97
  • Pb-207 = 17/100 × 206.98
  • Pb-208 = 68.5/100 × 207.98

  • Pb-206 = 29.865
  • Pb-207 = 35.186
  • Pb-208 = 142.466

The average atomic mass is as follows: 29.865 + 35.186 + 142.466 = 207.52

Therefore, the average atomic mass of lead given its three isotopes is 207.52.

Learn more about average atomic mass at: brainly.com/question/13753702

#SPJ1

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Ksenya-84 [330]

Answer: A dilation with rule: (x,y)\to(\dfrac12x,\dfrac12y)

Explanation:

A dilation is a non-rigid transformation that creates an image that is the same shape as the original but has a different size.

It uses a scale factor k such that

(x,y)\to(kx,ky)

(x,y)= coordinates of original figure

(kx,ky) = corresponding coordinate in the image.

To transform: A (3,-4) onto point A' (1.5,-2).

Using scale factor k= \dfrac12, we have

A(3,-4)\to A'(\dfrac12\times3, \dfrac12\times-4)=A'(1.5,-2)

Required rule: (x,y)\to(\dfrac12x,\dfrac12y)

3 0
3 years ago
What should be the temperature of the solvent before adding it to the sample to be recrystallized?
Serhud [2]

Answer:

Near the boiling point of the solvent

Explanation:

The process of recrystallization is hinged on the fact that the amount of solute that can be dissolved by a solvent increases with temperature. The process involves creation of a solution by dissolving a solute in a solvent at or near its boiling point.  At the boiling point of the solvent, the solute has a greater solubility in the solvent; not much volume of  the hot solvent is required to dissolve the solute.

Before the solution is later cooled, you can now filter out insoluble impurities from the hot solvent. The quantity of the original solute drops appreciably because impurities have been removed. At this lower temperature, the solution becomes saturated and the solute can no longer be held in solution hence it forms pure crystals of solute, which can be recovered.

Recrystallization must be carried out using the proper solvent. The solute must be relatively insoluble in the solvent at room temperature but more soluble in the solvent at elevated temperature.

3 0
3 years ago
Kaila runs competitively. She would like to calculate her average running speed each time she runs. Which data should Kaila reco
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Answer:

Start and end times; distance run.  

Step-by-step explanation:

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Kaila should record the distance run, the time she started, and the time she ended her run.

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If she inserts her numbers into the formula, she will get her average running speed.  

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NH_4^+

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PO_{4}^{3-}

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enot [183]

option (c) emulsion is the right answer

Emulsion is a classification of milk.

<h3>Describe an emulsion.</h3>

In physical chemistry, an emulsion is a combination of two or more liquids in which one of the liquids is present as microscopic or ultramicroscopic droplets dispersed throughout the other.

<h3>How is emulsion used?</h3>

Emulsions form as a result of the cleansing action of soaps.

(ii) The emulsification process is how lipids are broken down in the intestines.

(iii) Disinfectants and antiseptics combine with water to generate emulsions.

(iv) The emulsification technique is utilized to create medications.

<h3>How is an emulsion created?</h3>

When two immiscible liquids, such as oil and water, are stirred together with an emulsifier—which might be a protein, phospholipid, or even a nanoparticle—emulsion is created.

To learn more about emulsion visit:

brainly.com/question/6677364

#SPJ4

5 0
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