what is the condensed electron configuration for nitrogen

Answer:

its 210

Explanation:

Just add all atomic mass used in the formula together: 2*(14+16*3)+88= 2*62+88=124+88=210

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The relative formula mass of strontium nitrate Sr(NO₃)₂ is 210

The relative atomic masses of N, O and Sr are 14,16 and 88 respectively.

In calculating the relative atomic mass of an element with isotopes, the relative mass and proportion of each is taken into account. Adding the atomic masses together gives the relative formula mass of a compound

So, relative atomic mass of Sr(NO₃)₂ is calculated as

88+ 2(14+16×3) = 210

The atomic mass constant (symbol: mu) is defined as being 1/12 th of the mass of a carbon-12 atom. Since both quantities in the ratio are masses, the resulting value is dimensionless; hence the value is said to be relative atomic mass.

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Chemical bonds are formed when valence electrons are shared or donated.

Chemical bonds are formed between two or more atoms when electrons are transferred or shared between or among the participating atoms.

For example, ionic bonds are formed when a metal ion such as Na donates its valence electrons to a non-metallic ion such as Cl to form NaCl.

Covalent bonds are formed when participating ions shared their valence electrons to give each other octet states.

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There are approximately 1.387 moles in 25 grams of water (1) and 134.46 grams in 4.5 moles of Li₂O (2).

1. To calculate the number of moles, we need to divide the given mass of water by the molar mass of water, which is approximately 18.015 g/mol.

Number of moles = 25 grams / 18.015 g/mol

≈ 1.387 moles

Therefore, there are approximately 1.387 moles in 25 grams of water.

2. To calculate the mass in grams, we need to multiply the number of moles by the molar mass of Li₂O, which is approximately 29.88 g/mol.

Mass in grams = 4.5 moles x 29.88 g/mol

≈ 134.46 grams

Therefore, there are approximately 134.46 grams in 4.5 moles of Li₂O.

3. To determine the number of molecules in 23 moles of oxygen, we can use Avogadro's number, which states that there are 6.022 x 10²³ molecules in one mole of any substance. Therefore, for 23 moles of oxygen, we can calculate:

Number of molecules = 23 moles x 6.022 x 10²³ molecules/mole

= 1.38646 x 10²⁵ molecules

So, there are approximately 1.38646 x 10²⁵ molecules in 23 moles of oxygen.

4. To determine the number of moles in 3.4 x 10²³ molecules of H₂SO₄, we can use Avogadro's number. Since one mole contains 6.022 x 10²³ molecules, we can calculate:

Number of moles = (3.4 x 10²³ molecules) / (6.022 x 10²³ molecules/mole)

= 0.564 moles

So, there are approximately 0.564 moles in 3.4 x 10²³ molecules of H₂SO₄.

5. To determine the number of molecules in 25 grams of NH₃, we need to convert grams to moles using the molar mass of NH₃. The molar mass of NH₃ is 17.03 g/mol.

Number of moles = 25 grams / 17.03 g/mol

≈ 1.468 moles

Using Avogadro's number, we can calculate the number of molecules:

Number of molecules = (1.468 moles) x (6.022 x 10²³ molecules/mole)

= 8.831 x 10²³ molecules

So, there are approximately 8.831 x 10²³ molecules in 25 grams of NH₃.

The complete question is:

Answer the following questions:

1) How many moles are in 25 grams of water?

2) How many grams are in 4.5 moles of Li₂O?

3) How many molecules are in 23 moles of oxygen?

4) How many moles are in 3.4 x 10²³ molecules of H₂SO₄?

5) How many molecules are in 25 grams of NH₃ ?

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In Linear molecular geometry, the bond angle is 90°, in trigonal pyramidal geometry, bond angle is 107°, in trigonal planar geometry, bond angle is 120° and in tetrahedral, the bond angle is 109.5°.

In the linear geometry, the central atom has two side atoms attached which are at and bond angle of 180°.

In trigonal pyramidal geometry, the central atom has four side atoms which resembles a pyramid like structure. The bond angle between the two consecutive side atoms is 107°.

In trigonal planar geometry, three atoms are attached on the sides of central atom. The bond angle between these side atom is equal and of 120°.

In Tetrahedral geometry, the central atom and the side atoms makes a triangular prism like structure, the bond angle between side atoms is 109.5°.

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Enstatite, a pure Mg-endmember pyroxene, possesses an orthorhombic crystal structure with lattice parameters of a = 1.8228 nm, b = 0.8805 nm, and c = 0.5185 nm. It exhibits euhedral growth faces on {100}, {101}, {210}, and {010}, while cleavage is observed on the {210} face.

From the given information, we can understand the crystal structure of the pure Mg-endmember pyroxene, enstatite (MgSiO3), as well as the specific growth faces and cleavage observed on the crystal.

Crystal Structure;

Enstatite is described as an orthorhombic mineral. The crystal lattice of enstatite consists of interconnected silicon-oxygen (SiO4) tetrahedra, forming a three-dimensional network. The magnesium (Mg) cations are located within the void spaces of this tetrahedral framework.

Lattice Parameters:

The lattice parameters of enstatite are given as follows:

a = 1.8228 nm

b = 0.8805 nm

c = 0.5185 nm

These values represent the dimensions of the unit cell of the crystal structure. The unit cell is the basic repeating unit of the crystal lattice.

Euhedral Growth Faces;

Euhedral growth faces refer to the crystal faces that have developed during the growth of the mineral, displaying well-defined and characteristic crystallographic orientations. The euhedral growth faces observed on the pure Mg-endmember pyroxene enstatite include;

{100}: This represents a crystal face that corresponds to the direction perpendicular to the crystallographic a-axis.

{101}: This represents a crystal face that corresponds to a direction that intersects the a-axis and the b-axis.

{210}: This represents a crystal face that corresponds to a direction that intersects the b-axis and the c-axis.

{010}: This represents a crystal face that corresponds to the direction perpendicular to the crystallographic b-axis.

Cleavage Face;

Cleavage refers to the tendency of a mineral to break along planes of weakness. In the case of enstatite, cleavage is observed on the {210} face. This indicates that when a force is applied in the appropriate direction, the crystal structure of enstatite will break most easily along the {210} plane.

Therefore,  a pure Mg-endmember pyroxene, possesses an orthorhombic crystal structure with lattice parameters of a = 1.8228 nm, b = 0.8805 nm, and c = 0.5185 nm.

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The percentage of chloride in the unknown sample is approximately 15.93%.

To calculate the percentage of chloride in the unknown sample, you can use the mass of silver chloride obtained to determine the number of moles of chloride in the original sample, and then convert that to a percentage.

First, calculate the number of moles of silver chloride by dividing the mass by its molar mass:

0.7332 g / 143.32 g/mol = 0.00513 mol AgCl

Next, calculate the number of moles of chloride in the original sample by assuming a 1:1 ratio of chloride ions to silver ions in the reaction:

0.00513 mol AgCl * 1 Cl- / 1 Ag+ = 0.00513 mol Cl-

Finally, divide the number of moles of chloride by the mass of the original sample and multiply by 100 to convert to a percentage:

(0.00513 mol Cl- / 0.3221 g) * 100 = 15.93%

So, the percentage of chloride in the unknown sample is approximately 15.93%.

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Answer:

A) it is converted to an SI unit of measurement

Explanation:

The SI, System International units are the fundamental units used to measure the scientific quantities.

Example of SI units are Kilogram (km) for distance, liter (l) for liquid, centimeter (cm), and meter (m) for size of the object or short distance etcetera.

SI units help to differentiate quantities from each other and without using SI unit, no one can identify the category of the quantity whether it is distance, size or volume.

Hence, the correct answer is "A) it is converted to an SI unit of measurement".

Answer:

most likely water

Explanation:

most likely it is water, however pressure plays a role, if you are at sea level the boiling point of water is 100°C but if you are on Mt. Everest it is 71°C, assuming she is slightly above sea level it is water.

Answer:

The monomers that make up proteins are called amino acids.

C. Amino Acid

Explanation:

btw brainliest please

hope it helps

Amino acid are the monomer 'building blocks' that make up the protein. The correct option is (c).

Proteins are macromolecules composed of long chains of amino acids. Amino acids are the monomer units that make up proteins.

They are organic compounds consisting of an amino group (-NH2), a carboxyl group (-COOH), and a side chain group (-R) attached to a central carbon atom.

There are 20 different types of amino acids that can be combined in various sequences to form different proteins.

During protein synthesis, amino acids are joined together through peptide bonds, forming a polypeptide chain. The unique sequence of amino acids determines the structure and function of the protein.

Proteins have a diverse range of functions in the body, including enzyme catalysis, structural support, immune response, and transport of molecules.

Monosaccharides are the building blocks of carbohydrates, glycerol molecules are components of triglycerides (fats), and fatty acids are the monomers of lipids.

Cholesterol molecules are a type of lipid but are not the monomers of proteins.

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The element that is most likely to pair with beryllium in a 1:1 relationship based on valence electron trends would be Se ( 6 valence electrons ). That is option A.

Valence electron is defined as the electron of an atom that is located at the outermost shell which takes part in formation of chemical bonding during a chemical reaction.

The number of Valence electron of the element beryllium = 2

The number of Valence electron of the selenium = 6

Therefore, both beryllium and selenium can form a chemical bond in a 1:1 relationship based on valence electron trends as both will complete their outer most shell into 8 electrons.

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In the above intermediate chemical equation, oxygen will appear as follows: O₂(g) as a reactant (option B).

A chemical equation in chemistry is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

According to this question, an intermediate chemical equation is presented as follows:

As observed in the above chemical equation, oxygen will react in its gaseous form i.e. as a reactant.

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To prepare a pH 3.90 buffer using 500.0 mL of a 0.250 M Na(HO₂CC)²⁻ solution, you would need to add approximately 0.774 mmol of HCl.

To prepare a buffer at a specific pH, you need to consider the Henderson-Hasselbalch equation:

pH = pKa + log([A⁻]/[HA])

In this case, Na(HO₂CC)²⁻ is the conjugate base (A-) and its acid form (HA) is not mentioned. Let's assume that the acid form is HO₂CCOH. The pKa of this weak acid is not provided, so we'll use a typical pKa value for a carboxylic acid, which is around 4.75.

To achieve a pH of 3.90, we can rearrange the Henderson-Hasselbalch equation as follows:

3.90 = 4.75 + log([A⁻]/[HA])

Simplifying:

-0.85 = log([A⁻]/[HA])

Taking the antilog of both sides:

10^(-0.85) = [A⁻]/[HA]

[A⁻]/[HA] ≈ 0.139

Given that the initial concentration of [A⁻] is 0.250 M, the initial concentration of [HA] can be calculated as:

[HA] ≈ [A⁻] / 0.139 ≈ 0.250 / 0.139 ≈ 1.798 M

Now, to prepare a buffer, we need to add HCl to convert the base (A-) to its acid form (HA). The moles of HCl required can be calculated as:

moles of HCl = (initial moles of [HA]) - (moles of [HA] remaining)

moles of HCl = (initial concentration of [HA] × volume in liters) - (final concentration of [HA] × volume in liters)

moles of HCl = (1.798 M × 0.500 L) - (0.250 M × 0.500 L)

moles of HCl ≈ 0.899 - 0.125

moles of HCl ≈ 0.774 mmol

Therefore, you would need to add approximately 0.774 mmol of HCl to prepare the pH 3.90 buffer.

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Considering the definition of empirical formula, the empirical formula is C₃H₈.

The empirical formula, which specifies the elements that are present and the minimal proportion in whole numbers that exist between its atoms—that is, the subscripts of chemical formulas are reduced to the most integers—is the simplest statement to represent a chemical compound. as little as feasible.

Percent composition:

C: 81.71 %

H: 18.29%

In a 100 grams sample, you have 81.71 grams of carbon and 18.29 grams of hydrogen H.

C = 6.81 moles

H = 18.29 moles

To express this relationship in the form of simple integers

C: H mole ratio is 3: 8

Finally, the empirical formula is C₃H₈.

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Answer:

its a.

Explanation:

The complete ionic equation for the reaction between lithium sulfide (Li2S) and copper(II) nitrate (Cu(NO3)2) can be written as:

2Li+ (aq) + S2- (aq) + 2Cu2+ (aq) + 4NO3- (aq) -> 2Li+ (aq) + 2NO3- (aq) + Cu2S (s)

When aqueous solutions of lithium sulfide (Li2S) and copper(II) nitrate (Cu(NO3)2) are mixed, the following ionic reaction occurs:

Lithium sulfide dissociates into lithium cations (Li⁺) and sulfide anions (S²⁻), while copper(II) nitrate dissociates into copper(II) cations (Cu²⁺) and nitrate anions (NO₃⁻). In the reaction, the lithium cations and sulfide anions combine with the copper(II) cations and nitrate anions to form lithium cations and nitrate anions in the aqueous solution. Simultaneously, copper sulfide (Cu₂S) is produced as a solid precipitate which indicates a chemical reaction has taken place.

2Li+ (aq) + S2- (aq) + 2Cu2+ (aq) + 4NO3- (aq) -> 2Li+ (aq) + 2NO3- (aq) + Cu2S (s)

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Taking into account the definition of calorimetry, sensible heat and latent heat,  the heat of fusion of water is 335.091 \(\frac{J}{g}\) .

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

Latent heat is defined as the energy required by a quantity of substance to change state.

When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.

In this case:

In firts place, you know that the melting point of water is 0°C. So, first of all you must increase the temperature from -25° C (in solid state) to 0 ° C, in order to supply heat without changing state (sensible heat).

The amount of heat a body receives or transmits is determined by:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Replacing:

Q1= 2.03\(\frac{J}{gC}\) × 49.3 g× 25 °C

Solving:

Q1=2501.975 J=2.501975 kJ≅ 2.50 kJ

The heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to

Q = m×L

where L is called the latent heat of the substance and depends on the type of phase change.

In this case, you know:

Replacing:

Q2= 49.3 g× ΔHfus

Similar to sensible heat previously calculated, you know:

Replacing:

Q3= 4.18\(\frac{J}{gC}\) × 49.3 g× 44.7 °C

Solving:

Q3= 9211.5078 J=9.2115078 kJ≅ 9.21 kJ

The total heat required is calculated as:

Total heat required= Q1 + Q2 + Q3

Total heat required= 2.50 kJ + 49.3 g× ΔHfus + 9.21 kJ

Heating a 49.3 g sample of g ice from -25.0 °C to water at 44.7 °C requires 28.23 kJ of heat. This is, the total heat required is 28.23 kJ. Then:

28.23 kJ= 2.50 kJ + 49.3 g× ΔHfus + 9.21 kJ

Solving:

28.23 kJ= 11.71 kJ + 49.3 g× ΔHfus

28.23 kJ- 11.71 kJ = 49.3 g× ΔHfus

16.52 kJ = 49.3 g× ΔHfus

16.52 kJ ÷ 49.3 g= ΔHfus

0.335091\(\frac{kJ}{g}\)= 335.091 \(\frac{J}{g}\) =ΔHfus

In summary, the heat of fusion of water is 335.091 \(\frac{J}{g}\) .

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Answer: It's 2,089m2

Explanation:

Answer:

110.21 g/mol

............................

Answer:

110.22 g in 2.75 moles of calcium

Explanation:

to convert moles to grams

moles (g/mol)

2.75 mol Ca (40.08 (atomic weight) g Ca/1 mol Ca)= 110.22

Answer:

I do not know. I think there is .as we are the living creatures in this earth. maybe aliens are creatures of other planet or galaxies. I am not scientists to prove it.sorry.

Answer:

2, strong acid

Explanation:

Data obtained from the question. This includes:

[H+] = 0.01 M

pH =?

pH of a solution can be obtained by using the following formula:

pH = –Log [H+]

pH = –Log 0.01

pH = 2

The pH of a solution ranging between 0 and 6 is declared to be an acid solution. The smaller the pH value, the stronger the acid.

Since the pH of the above solution is 2, it means the solution is a strong acid.

Answer:

I think that it is Trachea

In the electrolysis of aqueous sodium chloride, we predict to happen at the cathode: Reduction of hydrogen ions. The correct option is A.

In the electrolysis of aqueous sodium chloride (NaCl), the cathode is the electrode where reduction occurs. Reduction is the gain of electrons, and it occurs at the cathode.

At the cathode, two possible reduction reactions can occur: reduction of hydrogen ions (H⁺) or reduction of water (H₂O). In this case, the presence of aqueous sodium chloride suggests that there are both sodium ions (Na⁺) and hydrogen ions (H⁺) in the solution.

However, the reduction of hydrogen ions (H⁺) is more favorable at the cathode than the reduction of water. The hydrogen ions (H⁺) from the dissociation of water and the sodium chloride solution will be preferentially reduced to form hydrogen gas (H₂).

Therefore, the predicted reaction at the cathode in the electrolysis of aqueous sodium chloride is the reduction of hydrogen ions (H⁺) to produce hydrogen gas (H₂). The correct option is A.

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An element is a substance that cannot be broken down further into simpler components by a chemical reaction.

An element is a pure substance that cannot be separated into simpler substances. Elements are sterling substances that cannot be broken down into simpler substances by usual chemical means. Hydrogen and oxygen, on the other hand, cannot decay into simpler substances

Water can also be divided into smaller molecules by chemical means, so it can also be restricted as a substance that can be separated into simpler substances only by the chemical way. They are therefore elementary, or easy, chemical substances - elements.

So we can conclude that Since elements are pure substances, so they cannot be part of two or easy substances by chemical methods.

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Answer:

0.921 J/g degrees C

Explanation:

Recall that the First Law of Thermodynamics demands that the total internal energy of an isolated system must remain constant. Any amount of energy lost by the brakes must be gained by the tires (in the form of heat in this situation).  Therefore, heat given off by the brakes = −heat taken in by tires, or:

−qbrakes=qtires

The equation used to calculate the quantity of heat energy exchanged in this process is:

−qbrakes=−cbrakes mbrakes ΔTbrakes=ctires mtires ΔTtires=qtires

First we must convert the mass of the tires and the brakes from  kg to  g.

massbrakes=90.7 kg×1,000. g1 kg=9.07×104 g

masstires=123 kg×1,000. g1 kg=1.23×105 g

Next, substitute in known values and rearrange to solve for ctires. Note that the final temperature for both the tires and the brakes is 172∘C, the initial temperature of the brakes is 312∘C and the initial temperature of the tires is 15∘C.

−(1.400Jg∘C)(9.07×104 g)(172∘C−312∘C)=(ctires)(1.23×105 g)(172∘C−15∘C)

ctires=−(1.400 Jg∘C)(9.07×104 g)(−140∘C)(1.23×105 g)(157∘C)=17,777,200 J19311000 g∘C=0.9206Jg∘C

The answer should have three significant figures, so round to 0.921Jg∘C.

Answer:

0.97

Explanation:

Let R₁ represent the rate of diffusion of NO.

Let R₂ represent the rate of diffusion of CO.

Molar mass of NO (M₁) = 14 + 16 = 30 g/mol

Molar mass of CO (M₂) = 12 + 16 = 28 g/mol

Thus, the rate of NO to CO can be obtained as follow:

R₁ /R₂ = √(M₂/M₁)

R₁ /R₂ = √(28/30)

R₁ /R₂ = √(28/30)

R₁ /R₂ = 0.97

R₁ : R₂ = 0.97

NO : CO = 0.97

Therefore, the rate of diffusion of NO to CO is 0.97

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{2.3 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{2.3}{6.02} \\ = 0.382059...\)

We have the final answer as

Hope this helps you

Answer:

A. The largest value is 7 and the smallest value is 1. Find the difference. 7 - 1 = 6.

Explanation:

Explanation:

Since the oxidation state of Mg is changed to +2 from 0, it is oxidized. (as it is increased)

Similarly, oxidation state of Cu is changed to 0 from +2, it is reduced. (as it is decreased)

Since oxidation & reduction occur at the same time, it is redox reaction.

As Mg is being oxidized, other one must be the oxidizing agent.

Cu is the oxidizing agent