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Elenna [48]
3 years ago
13

For a material that contains n atoms, how many electron states will there be in a p band

Chemistry
2 answers:
dem82 [27]3 years ago
8 0

Answer:

There will be 3N electron states in a p band.

Explanation:

In chemistry it is learned that under normal conditions atoms that have 4 electrons in the last valence shell are not stable. Semiconductors fall into this group, but because of the way in which they group their atoms, they can achieve stability by making four covalent chemical bonds, getting 8 electrons in the last shell, and consequently becoming chemically stable. However, semiconductors form Energy Bands. The above question is referring to a semiconductor.

Each energy level in a semiconductor splits, forming a series of atoms next to each other known as energy bands. The number of atoms within these bands will be equal to the sum of all equivalent atoms of the N atoms present in the semiconductor solid. For example, an s band will consist of N atoms and a p band of 3N atoms.

Sveta_85 [38]3 years ago
5 0
Number of states present in each band will be equal to total of all the states contributed by N atoms. 

For instance, s band will contain N states.

Similarly, a p band will contain 3N states. 
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2Fe(s) +3H2SO4(aq) →Fe2(SO4)3(aq) +3H2(g)When 10.3 g of iron are reacted with 14.8 moles of sulfuric acid, what is the percent y
Elden [556K]

Answer:

1040%

Explanation:

To solve this question we must convert the mass of Iron to moles in order to find limiting reactant. With limiting reactant we can find the theoretical moles of hydrogen and theoretical mass:

Percent yield = Actual yield (5.40g) / Theoretical yield * 100

<em>Moles Fe -Molar mass: 55.845g/mol-:</em>

10.3g * (1mol / 55.845g) = 0.184 moles of Fe will react.

For a complete reaction of these moles there are necessaries:

0.184 moles Fe* ( 3 mol H2SO4 / 2 mol Fe) = 0.277 moles H2SO4.

As there are 14.8 moles of the acid, <em>Fe is limiting reasctant.</em>

The moles of H2 produced are:

0.184 moles Fe* ( 3 mol H2 / 2 mol Fe) = 0.277 moles H2

The mass is:

0.277 moles H2 * (2.016g/mol) = 0.558g H2

Percent yield is:

5.40g / 0.558g * 100 = 1040%

It is possible the experiment wasn't performed correctly

7 0
2 years ago
Describe a method to calculate the average atomic mass of the sample in the previous question using only the atomic masses of li
alexira [117]

Answer:

Explanation:

To calculate their average atomic masses which is otherwise known as the relative atomic mass, we simply multiply the given abundances of the atoms and the given atomic masses.

The abundace is the proportion or percentage or fraction by which each of the isotopes of an element occurs in nature.

This can be expressed below:

        RAM = Σmₙαₙ

where mₙ is the mass of isotope n

           αₙ is the abundance of isotope n

for this problem:

RAM of Li = m₆α₆ + m₇α₇

       m₆ is mass of isotope Li-6

        α₆ is the abundance of isotope Li-6

       m₇ is mass of isotope Li-7

        α₇ is the abundance of isotope Li-7

3 0
3 years ago
Fill in the blanks....
sveta [45]
Iron 1 chlorine 3 for number what I suggest you do is look at the periodic table online and then look at the numbers and see how many are there
3 0
3 years ago
Insects often get stuck in the sap of ancient trees. The sap along with the insect inside harden forming a fossil. What kind of
shepuryov [24]
Crystallization

This is because insects that usually get stuck in sap tend to harden or crystallize, so they cannot get out. That is why it is a crystallization.
6 0
3 years ago
1. 750 x 10^3 ng to g​
Temka [501]

Answer:

1.750×10^-6 g

Explanation:

we know n is 10^-9. all you have to do is to replace n with 10^-9.

so the answer is

1.750×10^3×10^-9 g

which is equal to 1.750×10^-6 g

if anything is unclear, ask freely.

4 0
3 years ago
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