How are electrons arranged around the nucleus of an atom​

There are 0.00968 moles of iron (Fe 2) in the 1.86 g sample of Fe(NH4)2(SO4)2 · 6H2O.

To determine the moles of iron (Fe 2) in the sample, we need to first calculate the molar mass of the compound Fe(NH4)2(SO4)2 · 6H2O.

The molar mass of Fe(NH4)2(SO4)2 · 6H2O is calculated as follows:
Fe: 55.85 g/mol
N: 14.01 g/mol x 2 = 28.02 g/mol
H: 1.01 g/mol x 12 = 12.12 g/mol
S: 32.07 g/mol x 2 = 64.14 g/mol
O: 16.00 g/mol x 14 = 224.00 g/mol
Total molar mass = 55.85 + 28.02 + 12.12 + 64.14 + 224.00 = 384.13 g/mol

Now we can use the formula for moles to calculate the moles of iron (Fe 2) in the sample:
moles = mass / molar mass
moles = 1.86 g / 384.13 g/mol
moles = 0.00484 mol

Since there are two moles of iron (Fe 2) in the compound, we can multiply the moles of the compound by 2 to get the moles of iron:

moles of iron (Fe 2) = 0.00484 mol x 2 = 0.00968 mol

Therefore, there are 0.00968 moles of iron (Fe 2) in the 1.86 g sample of Fe(NH4)2(SO4)2 · 6H2O.

To know more about moles, refer here:

https://brainly.com/question/26416088#

#SPJ11

Explanation:

To solve this question, we need to use the Hess's Law.

Hess's Law states that: in a chemical reaction, the heat released or absorbed is constant and independent of the number of steps the reaction goes through. That is, the law states that the enthalpy change of a chemical reaction depends only on its initial state and its final state.

Hess's Law is also known as the law of the sum of heats of reaction, because the enthalpy change is equal to the sum of the changes in the steps through which the chemical reaction passes (intermediate reactions). The calculation is performed as follows:

- If the chemical reaction is inverted, the sign of the enthalpy change must also be inverted;

- If the equation is multiplied, the enthalpy change must also be multiplied;

- If dividing the equation, the enthalpy change must also be divided.

So we're going to invert, divide, or multiply each given equation in order to get the equation that the question gives us.

The equation the question gives us is:

4Al(s) + 3MnO2(s) --> 2Al2O3 (s) + 3Mn(s)

Let's multiply the first equation by 2:

4 Al + 3 O2 --> 2 Al2O3

ΔH = -1676 * 2 = -3,352 kJ

Let's invert and multiply by 3 the second equation:

3 MnO2 -> 3 Mn + 3O2

ΔH = -521 * 3 * (-1)

ΔH = 1,563 kJ

Answer: -1,789 kJ

The type of membrane transport process that uses ATP (adenosine triphosphate) as a source of energy is called active transport.

Active transport is a cellular process that enables the movement of ions or molecules across a cell membrane against their concentration gradient (from an area of lower concentration to an area of higher concentration). This movement is energetically unfavorable because it goes against the natural tendency of molecules to move from areas of higher concentration to lower concentration (down the concentration gradient). Therefore, active transport requires the input of energy.

ATP, as the energy currency of cells, is utilized by specific proteins called ATPases or ATP-powered pumps to actively transport molecules or ions across the membrane. These pumps use the energy released by ATP hydrolysis (the breakdown of ATP into ADP and inorganic phosphate) to perform work against the concentration gradient.

ATP-powered pumps are involved in various vital physiological processes, such as the maintenance of ion gradients across cell membranes, nutrient uptake in cells, and removal of waste products. Examples of ATP-powered pumps include the sodium-potassium pump, calcium pump, and proton pump.

The active transport process is highly selective, allowing the cell to control the movement of specific ions or molecules across the membrane and maintain concentration gradients necessary for cellular functions.

Learn more about ATP here:

https://brainly.com/question/32091528

#SPJ11

Answer:

Molarity = 2.0833 M (Approx)

Explanation:

Given:

Number of moles (n) = 0.25

Volume of solution = 120 ml = 0.12 L

Find:

Molarity

Computation:

Molarity = Number of moles (n) / Volume of solution.

Molarity = 0.25 / 0.12

Molarity = 2.0833 M (Approx)

Answer:

2Li + ZnBr2 ->2LiBr + Zn

3Ca + Al2O3 ->2Al + 3CaO

Explanation:

Spontaneous reactions are reactions that can happen on their own. For a spontaneous reaction to occur, a metal that is higher in the activity series must displace a metal that is lower in the activity series from its solution and not vice versa.

If we look at the two reactions selected in the answer, lithium is above zinc in the activity series and calcium is above aluminum in the activity series hence the two reactions occur spontaneously.

Answer:

Mass = 3 g

Explanation:

Given data:

Mass of magnesium = 2.4 g

Mass of oxygen = 2.4 g

Mass of magnesium oxide formed = ?

Solution:

Chemical equation;

2Mg + O₂    →     2MgO

Number of moles of oxygen:

Number of moles = mass / molar mass

Number of moles = 2.4 g/ 32 g/mol

Number of moles = 0.075 mol

Number of moles of magnesium:

Number of moles = mass / molar mass

Number of moles = 2.4 g/ 24 g/mol

Number of moles = 0.1 mol

now we will compare the moles of magnesium oxide with both reactant.

               Mg         :        MgO

                 2          :          2

               0.075    :        0.075

               O₂         :         MgO

                1          :           2

             0.1         :      2/1×0.1 = 0.2

Mass of magnesium oxide:

Mass = number of moles × molar mass

Mass = 0.075 mol × 40 g/mol

Mass = 3 g

The conjugate acid of CIO⁻ is HClO. Hence, Option (D) is correct.

A conjugate acid, within the Brønsted–Lowry acid–base theory, is a chemical compound formed when an acid donates a proton to a base.

In other words, it is a base with a hydrogen ion added to it, as in the reverse reaction it loses a hydrogen ion.

Therefore, The conjugate acid of CIO⁻ is HClO. Hence, Option (D) is correct.

#SPJ2

Answer:

The balanced chemical equation is,

                                 4 Fe + 3 O₂ → 2 Fe₂O₃

Drag four iron atoms and 3 oxygen molecules and place it on the left plate.

And drag 2 molecules of ferric oxide and place it on the right plate.

Answer:

Now, we have to determine the limiting reagent.

Now, we have to determine the limiting reagent.4 g of H₂ reacts with 32 g of O₂ 1 g of H₂ reacts with 32/4 g of O₂ 3 g of H₂ reacts with 32/4 x 3 = 24 g of

Now, we have to determine the limiting reagent.4 g of H₂ reacts with 32 g of O₂ 1 g of H₂ reacts with 32/4 g of O₂ 3 g of H₂ reacts with 32/4 x 3 = 24 g ofBut according to the question, 29 g of O₂ is present. 2

Now, we have to determine the limiting reagent.4 g of H₂ reacts with 32 g of O₂ 1 g of H₂ reacts with 32/4 g of O₂ 3 g of H₂ reacts with 32/4 x 3 = 24 g ofBut according to the question, 29 g of O₂ is present. 2So, the limiting reactant is hydrogen.

Now, we have to determine the limiting reagent.4 g of H₂ reacts with 32 g of O₂ 1 g of H₂ reacts with 32/4 g of O₂ 3 g of H₂ reacts with 32/4 x 3 = 24 g ofBut according to the question, 29 g of O₂ is present. 2So, the limiting reactant is hydrogen.Now, 4 g of H₂ forms 36 g of H₂O

Now, we have to determine the limiting reagent.4 g of H₂ reacts with 32 g of O₂ 1 g of H₂ reacts with 32/4 g of O₂ 3 g of H₂ reacts with 32/4 x 3 = 24 g ofBut according to the question, 29 g of O₂ is present. 2So, the limiting reactant is hydrogen.Now, 4 g of H₂ forms 36 g of H₂O1 g of H₂ forms 36/4 g of H₂O. 3 g of H₂ forms 36/4 x 3 = 27 g of H₂O

Now, we have to determine the limiting reagent.4 g of H₂ reacts with 32 g of O₂ 1 g of H₂ reacts with 32/4 g of O₂ 3 g of H₂ reacts with 32/4 x 3 = 24 g ofBut according to the question, 29 g of O₂ is present. 2So, the limiting reactant is hydrogen.Now, 4 g of H₂ forms 36 g of H₂O1 g of H₂ forms 36/4 g of H₂O. 3 g of H₂ forms 36/4 x 3 = 27 g of H₂OMaximum amount of water that can be formed is 27 g.

Now, we have to determine the limiting reagent.4 g of H₂ reacts with 32 g of O₂ 1 g of H₂ reacts with 32/4 g of O₂ 3 g of H₂ reacts with 32/4 x 3 = 24 g ofBut according to the question, 29 g of O₂ is present. 2So, the limiting reactant is hydrogen.Now, 4 g of H₂ forms 36 g of H₂O1 g of H₂ forms 36/4 g of H₂O. 3 g of H₂ forms 36/4 x 3 = 27 g of H₂OMaximum amount of water that can be formed is 27 g.For, amount of oxygen left of unreacted, Only 24 g of oxygen will react.

Now, we have to determine the limiting reagent.4 g of H₂ reacts with 32 g of O₂ 1 g of H₂ reacts with 32/4 g of O₂ 3 g of H₂ reacts with 32/4 x 3 = 24 g ofBut according to the question, 29 g of O₂ is present. 2So, the limiting reactant is hydrogen.Now, 4 g of H₂ forms 36 g of H₂O1 g of H₂ forms 36/4 g of H₂O. 3 g of H₂ forms 36/4 x 3 = 27 g of H₂OMaximum amount of water that can be formed is 27 g.For, amount of oxygen left of unreacted, Only 24 g of oxygen will react.But 29 g is the given amount. Amount of oxygen unreacted = 29 - 24 = 5 g

The theoretical yield of the given chemical equation is 64 g and limiting reactant is oxygen.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

As per the equation 4 g hydrogen reacts with 32 g oxygen thus 8 g hydrogen will react with 8×32/4=64 g oxygen.

Thus, the  theoretical yield of the given chemical equation is 64 g .

Learn more about chemical equation,here:

https://brainly.com/question/28294176

#SPJ7

The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


To learn more about molarity click here: brainly.com/question/31545539

#SPJ11

Answer:

If Thomson's atomic theory was accurate, the positively charged particles would have gone through the foil.

The enthalpy change for the reaction CaCO3 (s) -> CaO (s, graphite) + O2 (g) is 571.6 kJ.

The enthalpy of the reaction CaCO3 (s) -> CaO (s, graphite) + O2 (g) can be calculated by summing the enthalpies of the individual reactions involved. The given information provides the enthalpy change for the decomposition of CaCO3 (s) and the combustion of C (s) to form CO2 (g). By combining these reactions, the enthalpy change for the overall reaction can be determined.

The given reactions are:

CaCO3 (s) -> CaO (s) + CO2 (g) (H = 178.1 kJ)

C (s, graphite) + O2 (g) -> CO2 (g) (H = -393.5 kJ)

To calculate the enthalpy change for the reaction CaCO3 (s) -> CaO (s, graphite) + O2 (g), we need to subtract the enthalpy change of reaction 2 from the enthalpy change of reaction 1. Since the enthalpy change is an extensive property, we can subtract the enthalpies directly:

ΔH = H(reaction 1) - H(reaction 2)

= 178.1 kJ - (-393.5 kJ)

= 178.1 kJ + 393.5 kJ

= 571.6 kJ

Therefore, the enthalpy change for the reaction CaCO3 (s) -> CaO (s, graphite) + O2 (g) is 571.6 kJ.

To learn more about enthalpy click here:

brainly.com/question/32882904

#SPJ11

The skeletal rearrangement of the forma- tion of epoxide 2 from bromohydrin 1.

Skeletal rearrangement reactions, which contain a exchange of connectivity of the substrate thru cleavage of carbon-carbon, carbon-heteroatom, and heteroatom-heteroatom bonds, have attracted plenty interest as a synthetic method of highly substituted organic.

Intermediate is a 3-membered ring (halonium ion). Halohydrin formation (specifically chlorohydrin and bromohydrin formation) is the end result of the addition of a halogen (Cl or Br--less substituted side) and a hydroxyl institution (greater substituted aspect) across an alkene.

Learn more about research here:-

brainly.com/question/968894

#SPJ4

The mass of Hg in the sample is 17.1g.

One of the fundamental quantities in physics and the most fundamental feature of matter is mass. The quantity of matter in a body is referred to as its mass. The kilogram, the standard international unit of mass (kg). You can write the mass formula as follows:

Mass = Density × Volume

The water weighs 1400 g. And one night later, we grew by one. Therefore, multiplying X 12.2 by 1400 multiplied by a million. We therefore possess 0.01708 grammes of mercury. When converted to milligrams, this amount equals 17.1 milligrams of mercury.

Learn more about mass on:

brainly.com/question/9120030

#SPJ1

Answer:

5.68%

Explanation:

Percent Composition of Boron = Atomic Mass of Boron / Molar mass of Sr3(BO3)2  * 100%

Atomic mass of B = 10.811 g/mol

Molar mass of Sr3(BO3)2 = 380.4784 g/mol

Percent composition = 2 (10.811) / 380.4784  * 100

Percent composition = 21.622 / 380.4784  * 100

Percent composition = 5.68%

The gas sample is Cl₂. Answer A.

The ideal gas equation formula PV = nRT

Calculating the number of moles of the gas sample.

PV = nRT

1.04 × 1.365 = n × 0.0821 × 368

1.4196 = n × 30.21

n = 1.4196 ÷ 30.21

n = 0.04699 mol

The formula for mass and number of moles m = n × Mr

Calculating the molar gas from the sample

Mr = m ÷ n
Mr = 3.33 ÷ 0.04699

Mr = 70.9 g/mol

From the info given, gas Cl₂ has the same molar mass as the sample.

So, the gas sample is Cl₂, chlorine gas.

Learn more about ideal gas equation here: https://brainly.com/question/20348074

#SPJ4

The central atom of the molecule has three electrons on its valence shell.

The valance shell electron pair repulsion theory shows us the number of electron pairs that can be found on the valance shell of the central atom of the molecule. Recall that the shape  of the molecule is determined by the number of electron pairs that can be found on the valance shell of the central atom of the molecule.

Hence, given the fact that the  molecule contains 3 atoms. It has 1 triple bond and 1 single bond, we can be able to conclude that the molecule has three electron pairs on its valance shell.

Learn more about valence shell:https://brainly.com/question/7871741

#SPJ1

66.7 mL of Ethanol was dissolved in 222.2 mL of water. the volume % of the ethanol in the solution is 30.0 %.

Given that :

volume of the solute = 66.7 mL

volume of the solution = 222.2 mL

by using the volume % formula we can directly determine the volume % of ethanol, the percent by volume  expression is given as :

volume % = (volume of solute / volume of solution ) × 100 %

volume % = (66.7 / 222.2 ) × 100 %

volume % = 0.300  × 100 %

volume %  = 30 .0 %

( v / v ) % = 30.0 %

Thus, the percent by volume is 30.0 %.

To learn more about percent by volume here

https://brainly.com/question/23847585

#SPJ4

Answer:

Option D. 30 g

Explanation:

The balanced equation for the reaction is given below:

2Na + S —> Na₂S

Next, we shall determine the masses of Na and S that reacted from the balanced equation. This is can be obtained as:

Molar mass of Na = 23 g/mol

Mass of Na from the balanced equation = 2 × 23 = 46 g

Molar mass of S = 32 g/mol

Mass of S from the balanced equation = 1 × 32 = 32 g

SUMMARY:

From the balanced equation above,

46 g of Na reacted with 32 g of S.

Finally, we shall determine the mass sulphur, S needed to react with 43 g of sodium, Na. This can be obtained as follow:

From the balanced equation above,

46 g of Na reacted with 32 g of S.

Therefore, 43 g of Na will react with = (43 × 32)/46 = 30 g of S.

Thus, 30 g of S is needed for the reaction.

Answer:

Newton's second law of motion

F = ma

The molar mass of potassium nitrate is 101.102 g/mol while that of potassium nitrite is 85.103 g/mol.

Potassium nitrate goes by the chemical formula \(KNO_3\).

K = 39.098

N = 14.007

O = 15.999

Molar mass of  \(KNO_3\) = 39.098 + 14.007 + (3x15.999)

                                    = 101.102 g/mol

Potassium nitrite goes by the chemical formula, \(KNO_2\).

Molar mass of \(KNO_2\) = 39.098 + 14.007 + (2x15.999)

                                   = 85.103 g/mol

In other words, the molar masses of KNO3 and KNO2 are 101.102 g/mol and 85.103 g/mol respectively.

More on molar masses can be found here: https://brainly.com/question/22997914

#SPJ1

Answer:

104.5j

Explanation:

A physical change will occur when boiling water, tea, sugar, and ice are combined to form sweet iced tea.

A physical change is a change affecting the form of a chemical substance, but not its chemical composition.

The characteristics of some physical changes are as follows:

According to this question, one makes a glass of refreshing sweet iced tea by combining boiling water, tea, sugar, and ice on a hot summer day. The resulting solution is an example of a mixture, which contains constituents that retain their individual identity.

This suggests that the change is a physical change because there is no formation of a new substance.

Learn more about physical change at: https://brainly.com/question/17931044

#SPJ1

A kind of clinical experiment where neither the research team nor the subjects are aware of the treatment they are getting until the trial is over. As a result, the study's findings are less likely to be skewed.

Single-blind research typically involves keeping the research subject's treatment assignment a secret. In a double-blind study, the participant in the research, the investigator, the study coordinator or nurse, the study sponsor, and occasionally the data analyst are kept in the dark regarding the treatment allocation.

As doctors assess the results of their patients, bias is avoided by double blind investigations. As a result, clinical trial outcomes have increased reliability. Your doctor may "unblind" you if you experience health issues during a trial, such as a potential drug reaction, to reveal the treatment you are receiving.

To know more about experiment visit-

https://brainly.com/question/30712062

#SPJ1

The order of the atomic radius is;  

1) Potassium, Aluminum, Carbon,  Oxygen

2)  Potassium, Aluminum, Carbon, Oxygen

We know that the atomic radius has to do with the distance between one atom and another in that are not covalently combined. We know that the atomic radius is a function of the group to which the atom belongs.

We know that the atomic radius increases down the group but would tend to decrease across the period as more shells are added to the atom of the element.

Learn more about atomic radius:https://brainly.com/question/14544878

#SPJ1

The orbital diagram suggest Pauli's exclusion principle.

option C.

Pauli's Exclusion Principle is a fundamental principle of quantum mechanics that states that no two identical fermions (particles with half-integer spin, such as electrons, protons, and neutrons) can occupy the same quantum state simultaneously.

In other words, if one fermion is in a particular quantum state, then no other fermion can be in that same quantum state at the same time.

This principle is crucial in understanding the behavior of matter at the atomic and subatomic level. It explains, for example, why electrons in an atom occupy different energy levels and why atoms and molecules have unique chemical and physical properties.

The diagram suggest that the spin is different, so it describes Pauli's exclusion principle.

Learn more about Pauli's exclusion principle here: https://brainly.com/question/16950638

#SPJ1

Answer:

Bacteria decompose rotting plant animal material.

Explanation:

Theres good bacteria, and theres bad bacteria. some helps, and some makes things worse. so really, in some sense all of the above.

Hope that helps.

Bacteria are necessary for life because they help produce oxygen for plants and animals. Similarly bacteria decompose rotting plant and animal materials.

Bacteria are a type of organism which are classified as a kingdom of life. Bacteria are prokaryotic microbes that can spread diseases in animals and plants.

Some of the bacteria are very useful in for our life. Some of them are autotrophs thus, produce energy and oxygen. For example cyanobacteria release oxygen which is used animals and plants to respire.

Bacteria are very essential to degrade wastes and remove them from the  surface. They consume the decomposing plants and animals and make them biodegradable. Some bacteria living in plants helps in nitrogen cycle as well.

Find more on significance of bacteria:

https://brainly.com/question/14225790

#SPJ2

Answer:

just trust me the answer is B

Answer:

Formal

Explanation:

Answer:

I think its formal because the question looks a bit fancy by using all the present perfect tense..

hope this helped you

please mark as the brainliest ( if its correct)(ㆁωㆁ)