How many grams of NaBr are in 1.69 moles of NaBr?

Cells with nuclei belong in the domain<br> Archaea<br> Bacteria<br> Eukarya<br> Protists

svet-max [94.6K]

Eukarya cause all cells with nuclei are considered eukaryotic

5 0

3 years ago

Iron has many isotopes but only 4 are found in significant amounts in naturally found mixtures. The amounts by mass percent are:

AnnZ [28]

Answer:

The average mass of iron to be is 54.76 amu.

Explanation:

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$

1)

Mass of Fe-54 isotope = 53.9396 amu

Percentage abundance of Fe-54 = 5.845%

Fractional abundance of Fe-54 = 0.05845

2)

Mass of Fe-56 isotope = 55.9349 amu

Percentage abundance of Fe-56 = 91.754 %

Fractional abundance of Fe-56= 0.91754

3)

Mass of Fe-57 isotope = 56.9354 amu

Percentage abundance of Fe-57 = 2.119%

Fractional abundance of Fe-57 = 0.002119

4)

Mass of Fe-58 isotope = 57.9333 amu

Percentage abundance of Fe-58 = 0.282%

Fractional abundance of Fe-58 = 0.00282

Average atomic mass of iron :

$=53.9396 amu\times 0.05845+55.9349 amu\times 0.91754 +56.9354 amu\times 0.002119 + 57.9333 amu\times 0.00282=54.76 amu$

The average mass of iron to be is 54.76 amu.

5 0

3 years ago

What is the name of the molecule below?

Lostsunrise [7]

The name of the molecule above is <u>Ethene</u>

<h3>What are organic compounds?</h3>

Organic compounds can be defined as compounds containing carbon and hydrogen.

Some classes of organic compounds are:

Alkanes
Alkenes
Alkanols
Alkanals
Alkynes

So therefore, he name of the molecule above is Ethene

Learn more about organic compounds:

brainly.com/question/704297

#SPJ1

3 0

2 years ago

Mrs. Marlow's class is conducting an investigation of a mixture of sand, iron filings, and salt. They were told that they must s

aliina [53]

A mixture can be separated by looking at the physical properties of the components of the mixture.

Since salt is soluble in water, it can be added to the mixture to dissolve the salt.

The bar magnet is now introduced in order to remove the iron filings since they are attracted by a magnet.

The solution is filtered to separate the sand from the salt solution.

Lastly, the salt solution is heated to dryness to drive away the water and obtain the solid salt.

Hence the mixture has been separated into its components using their individual physical properties. Option A is the correct answer.

Learn more: brainly.com/question/12160179

8 0

3 years ago

Exothermic reactions release energy. Where is the energy used for these reactions to occur stored? .

Tanya [424]

Answer:

In the chemical bonds.

Explanation:

There are different types of chemical bonds, some store a TON of energy while others do not store as much. You can think of it like this: for bonds with low energy, it takes a LOT of force to pull them apart, meaning they are strong bonds. However, this way, you have to put energy into them to break the bonds and form a chemical reaction. This is an endothermic reaction, a reaction that absorbs heat from its surroundings.

Instead, bonds in exothermic reactions are BEGGING to form a more stable bond, and hence store a lot of potential energy. Due to the difficulty of maintaining these bonds, there is a lot of energy put into them. If you break them, however, (exothermic reaction) the energy is released, and hence the exothermic reaction happens.

Hope this helped. Please give Brainliest! :>

7 0

3 years ago