The density of solid cr is 7. 15 g/cm3. How many atoms are present per cubic centimeter (cm3) of cr?.

Considering  the following elementary gas-phase reversible reaction to be carried out isothermally with no pressure drop,

              1)  0% = 0

             2)  50%= 0.5

             3)   0.99Xe= 99%

When a chemical reaction is reversible, the reactants and products both react to create the final product at the same time.

Such a reaction involves constant forward and backward reactions between the reactants and products.

Simply said, when molecules collide, reactant bonds are disrupted, and the energy released from this broken connection is used to create new product molecules.

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Acetic acid is an organic compound with the formula CH3COOH. It is a carboxylic acid consisting of a methyl group that is attached to a carboxyl functional group. The concentration of acetic acid was 0.423M.

Acetic acid reacts with NaOH to form: - CH3CO2H + NaOH —- CH3CO2Na + H2O
That is, the moles of NaOH added equal the moles of acetic acid in the solution.
To solve the problem, find the moles of NaOH added to find the moles of acetic acid and its concentration using its volume as follows: Moles of NaOH: - 29.6ml= 0.0296L (0.250mol/L) = 0.0074 moles of NaOH= moles of acetic acid.
Acetic acid molarity is 0.0074moles/0.0175L = 0.423 M.

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Given that aluminum has a specific heat of 0.903, the combined temperature of the metal and water is 34.61 °C.

Calculate the pressure to temperature ratio using the formula k = p1/T1. The comparable pressure in a similar container can be determined by multiplying any temperature value by k: p2 = k T2. By multiplying each amount of pressure by k, you can determine the temperature.

Using the formula T(final) = (m1 T1 + m2 T2) / (m1 + m2), determine the final temperatures of the water mixture. T1 denotes the temperature of the first container of water, T2, and m1 and m2 denote the weights of the initial second containers of water, respectively.

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This flask originally held some copper wire and a clear solution of nitric acid. The two substances reacted and produced a brown gas and a blue solution. This reaction cannot be reversed.

This reaction is a non-reversible redox reaction.

A non-reversible redox reaction is a chemical reaction in which the reactants undergo a transfer of electrons resulting in the formation of new products that cannot be converted back into the original reactants by any means under normal conditions.

In a non-reversible redox reaction, one species loses electrons and becomes oxidized, while another species gains electrons and becomes reduced. The changes in electron distribution and oxidation states of the species are permanent and cannot be reversed.

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Sodium azide is a weak acid and it is formed by the reaction between weak acid (HN₃) and a strong base (NaOH). The solution contains Na⁺, N³⁻, H₂O are present in the solution. Molarity measures the amount of a solute.

Molarity measures the amount of a solute (substance being dissolved) in a given volume of a solvent (the dissolving medium).

Given information,

The concentration of NaN₃ = 0.016M

Ka value of hydrazoic acid (HN₃) = 1.9 × 10⁻⁵

The reaction is given as:

N³⁻(aq) + H₂O(l) → HN₃(aq) + OH⁻(aq)

[tex]\rm Kb = \frac{[HN_3] [OH_{6}^{-}]}{[N^{3-}]}\\\rm Kb = \frac{10^{-14}}{1.9\times10^{-5}} \\= 5.3\times10^{-10}\\\\\\[/tex]

Solving further,

[tex]\rm x^{2} + 5.3\times10^{-10}x - 8.48\times10^{-12} = 0\\\rm x = 2.91\times10^{-12}\\\rm x = \rm [OH^{-}] = [HN_{3}] = 2.91\times10^{-12}M\\[N^{3-}] = [Na^{+}] = 0.016M[/tex]

Therefore, the concentration of OH⁻ and  HN₃ is 2.91x10⁻¹² M and the concentration of N³⁻ and Na⁺ is  0.016M.

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Your question is incomplete, most probably the full question is this:

Sodium azide (NaN3) is sometimes added to water to kill bacteria. Calculate the concentration for all species in a 0.016M solution of NaN3 the Ka value for hydrazoic acid ( HN3) is 1.9×10^-5.

Answer:

157,500mg

Explanation:

Mass = density × volume

= 10.5 g/ml × 15 ml

= 157.5 g

Since the answer is asked in mg we will have to convert 157.5 g to mg:

157.5 × 1000 = 157, 500mg

The mass of silver with a volume of 15 ml can be calculated as follows:

mass = density × volume mass = 10.5 g/ml ×15 ml mass = 157.5 g

Since 1 g = 1000 mg, then 157.5 g = 157.5 × 1000 mg = 157,500 mg.

So, the mass of silver with a volume of 15 ml is 157,500 mg.

Silver is a dense metal with a high melting and boiling point, which is something to keep in mind. It is an important material in numerous industries, including electronics, jewellery, and coinage due to its excellent electrical and thermal conductivity. Because of its antibacterial qualities and because of its particular shine and malleability, it is also widely employed in the arts and in the medical area. Although silver's density is largely constant, conditions like temperature and purity can have an impact. The ability to calculate a substance's volume and mass using its density is another useful attribute that is significant in disciplines like materials science and engineering.

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Answer:

Explanation:

Matter cannot create itself, neither can it be destroyed. It can, however, change form. We see this in the case of H2O. H2O can change from being a liquid form (water) to a gas form (vapor), but it can never be eliminated from existence. Even though we can't see the vapor, that same liquid that we evaporated still exists, just in a different form.

I hope this helps! I would really appreciate it if you would please mark me brainliest! Have a blessed day!

Answer:

In simple terms law of conservation of matter asserts that the amount of matter in any system that is closed to the transfer of matter (in and out) remains constant.

Carbon tetrachloride is another name for CCl4. It has the chemical formula CCl4 and is an artificial organic molecule.

It has a pleasant, chloroform-like odour and is an inflammable, colourless liquid. There are many uses for carbon tetrachloride, including as a solvent, a refrigerant, and an ingredient in the manufacture of other compounds.

However, ingestion, inhalation, or skin absorption of carbon tetrachloride might have harmful effects on one's health. High levels of exposure can be lethal, and long-term exposure can harm the liver and kidneys. Its manufacturing and use have been limited or outlawed in several nations due to its poisonous nature.

Furthermore, carbon tetrachloride, a strong greenhouse gas, contributes to climate change and global warming through atmospheric release. It has a high potential for global warming and a long atmospheric lifetime, meaning that it stays in the atmosphere for a long time and contributes to warming.

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1. Strong beam-weak column resulting in column hinging, 2 Total collapse of a frame building due to the use of strong beams and weak columns

When a structural component or the entire structure loses its ability to carry its intended load, it is said to have experienced structural failure.

The structure is subjected to forces that can cause structural breakdown.

Four basic types of structural failures are Compressive, tensile, bending and buckling are the basic types of structural failure for construction elements.

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The number of mole of O₂ required for the reaction if 15.0 grams of N₂O4 is produced, is 0.326 mole

We'll begin by obtaining the number of mole in 15.0 g of N₂O₄. Details below:

Mole = mass / molar mass

Mole of N₂O₄ = 15 / 92

Mole of N₂O₄ = 0.163 mole

Next, we shall write the balanced equation for the reaction. This is givrn below:

N₂ + 2O₂ -> N₂O₄

From the balanced equation above,

1 mole of N₂O₄ was produced from 2 moles of O₂

Finally, we shall determine the number of mole O₂ required for the reaction. Details below:

From the balanced equation above,

1 mole of N₂O₄ was produced from 2 moles of O₂

Therefore,

0.163 moles of N₂O₄ will be produced from = 0.163 × 2 = 0.326 mole of O₂

Thus, number of mole of O₂ required is 0.326 mole

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H2S has the smallest bond angles . Because of the larger size and lesser electronegativity of sulphur (than nitrogen and oxygen), the bond angle of H2S is lower than that of the others.

What do bond angles mean?

Bond angle is referred to as the angle between two bonds, or the angle between two orbitals surrounding the central atom in a complex molecule or ion that include bonding electron pairs.

                        Using a spectroscopic approach, it is estimated and measured in degrees.

What is the definition of bond angle?

The "angle between the orbitals holding bonding electron pairs around the central atom in a molecule or in a complex ion" is what is meant by its definition. It is described in terms of degrees.

                 Example: The bond angle in CO2 is 180 degrees. Thus, the form of CO2 is linear. Any two bonds that share an atom are said to have a bond angle, which is often expressed in degrees.

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In light of this, the elements influencing solubility depend on the solute's state water is considered as a pure substance because, with a few exceptions, it can dissolve essentially all soluble compounds. The mobility of a chemical can be influenced by a number of circumstances. The creation of a new bond between the molecules of the solute and the solvent is termed as solubility.

A substance's chemical and physical properties determine how soluble it is. A few other factors and situations can also impact it. A few of them are: temperature, pressure, type of binding, and forces here between components.

On the other hand, if this thermal decomposition turns out to be exothermic, solubility drops. If a solution must be used to breakdown hydrocarbons as little more than a solute.

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The number of atoms linked to it and the quantity of lone pair electrons may be used to estimate the anticipated hybridization state and shape of the central atom.

There will be sp hybridization and a linear shape for a centre atom with two bonds. A three-bond centre atom will exhibit sp2 hybridization and trigonal planar shape. Tetrahedral geometry and sp3 hybridization are present in a core atom with four bonds. The number of atoms linked to it and the quantity of lone pair electrons may be used to estimate the anticipated hybridization state and shape of the central atom. Lone pair electrons can affect the geometry and cause it to deviate from the ideal geometry. In order to precisely establish the hybridization state and geometry of the central atom, a thorough examination of the electron distribution and bond angles is necessary.

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The dominant charge on the side group of Leu (Leucine) at pH = 7 would be neutral, or 0.

This is because Leucine has a neutral side group at this pH. The charge of amino acid side groups can change with changes in pH, but at a pH of 7, the side group of Leucine would be neutral.

The dominant charge on the side group of a protein depends on the pH, which refers to the level of acidity or basicity of a solution. At a pH of 7, which is considered neutral, the amino acid Leucine will have a neutral charge. This means that there will be an equal number of positively charged and negatively charged particles in the side group of Leucine, resulting in a dominant charge of 0. In general, the dominant charge on the side group of a protein can vary based on the pH, temperature, and other environmental factors.

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The balanced chemical equation of iron (II) oxide and water is Fe₂O₃ + 3 H₂O[tex]\rightarrow[/tex] 2 Fe(OH)₃.

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 .

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4.63 x 10²³ molecules of Oxygen are needed to react with 98.6 g of SO₂ (sulfur dioxide).

Given:

The mass of SO₂ = 98.6 g

The calculation for the molar mass of sulfur dioxide is:

Sulfur (S) = 32.07 g/mol

Oxygen (O) = 2 × 16.00 g/mol

= 32.00 g/mol

Total molar mass of SO₂:

= 32.07 + 32.00

= 64.07 g/mol

Number of moles of SO₂ = Mass of SO₂ / Molar mass of SO₂

Number of moles of SO₂ = 98.6 g / 64.07 g/mol

= 1.53 moles

Use the stoichiometry of the balanced chemical equation to determine the ratio of oxygen to sulfur dioxide.

From the balanced equation: 2SO₂ + O₂ → 2SO₃

The ratio of O₂ to SO₂ is 1:2.

The ratio of O₂ to SO₂ is 1:2, and the number of moles of O₂ is half the number of moles of SO₂.

Number of moles of O₂ = 1/2 × Number of moles of SO₂

Avogadro's number states that 1 mole of any substance contains 6.022 x 10²³ molecules.

Number of molecules of O₂ = Number of moles of O₂ × Avogadro's number

Number of moles of SO₂ = 98.6 g / 64.07 g/mol

= 1.539 mol

Number of moles of O = 1/2 × 1.539 mol

= 0.7695 mol

Number of molecules of O₂ = 0.7695 mol × (6.022 x 10^23 molecules/mol) = 4.63 x 10²³ molecules

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The movement of one or more electrons from one reactant to another is the key chemical event in an oxidation-reduction reaction, also called a(n) redox reaction.

What is a redox reaction?

A redox reaction (reduction-oxidation reaction) is a chemical reaction in which electrons are transferred from one molecule (the reductant) to another (the oxidant). This transfer leads to changes in the oxidation state of the molecules involved and results in the formation of two new species: a reduced species (acceptor of electrons) and an oxidized species (donor of electrons). This type of reaction is important in many natural processes, such as cellular respiration, corrosion, and photosynthesis.

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Covalent bonds are one of the most important types of chemical bonds formed by the overlapping of an element's atomic orbitals. Because of this overlapping, a very strong bond is formed, and covalent bonds are the strongest known bonds.

A molecule can contain both sigma bonds and pi bonds.

A single bond in a covalent bond is always a sigma bond.

A double bond consists of a sigma bond and a pi bond, whereas a triple bond consists of two pi bonds.

When we look at the molecule, we can see that it has 14 single bonds, 1 double bond, and 1 triple bond.

As a result, the molecule has 16 sigma bonds.

(14+1+1)

The total number of pi bonds 3(1+2).

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The type of the intermolecular forces act between a water molecule and a hydrogen fluoride molecule is the dipole dipole interaction.

The Dipole-Dipole interactions is the type of the intermolecular force of the attraction that occurs  when the two dipolar molecules will interact with the each other through the space. The hydrogen fluoride, that is H-F and the water molecule that is H₂O both are the polar compound.

The Dipole-dipole forces are the attractive forces that arises between the positive end of the one polar molecule and the negative end of the  other polar molecule.

Thus, the dipole dipole interaction is present between a water molecule and the hydrogen fluoride molecule.

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The maximum amount of water is only 38 g H2O because C2H6 is the limiting reactant and the amount of water in C2H6 is lower (2 significant digits)

According to the reaction equation; 2CO2(g) + 3H2O = C2H6(g) + 7/2O2(g) (g). Next, we change the provided reactant masses to reactant moles. The number of moles = mass/molar mass = 7.82g/30gmol-1 = 0.261 moles for ethane. The number of moles = 9.9 g/32 gmol-1 = 0.31 moles for oxygen The limiting reactant, which produces the least quantity of product, is what we identify next. As for ethane; 0.261 moles of Ethane produce 0.261 3 = 0.783 moles of water, according to the reaction equation. for oxygen. 3 moles of water are produced by 3.5 moles of oxygen. 0.31/3/3.5 = 0.266 moles of water are produced from 0.31 moles of oxygen. So, the limiting reactant is oxygen. Water produced as a mass equals 0.266 moles of water times 18 gmol-1, or 4.79 g of water. Ethane produces 3 moles of water from 1 mole.

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According to stoichiometry and concept of Avogadro's number there are 1.8×10²⁴ particles of ozone produced from 3 moles of nitrogen dioxide.

It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.In the given equation 1 mole of nitrogen dioxide gives 1 mole of ozone, thus  3 moles of NO₂ will give 3×1/1=3 moles of ozone.3 moles of ozone has 3×6.023×10²³=1.8×10²⁴ particles of ozone .

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The beginning of a boiling point is the temperature at which a substance boils under standard conditions of 1 atm pressure and the end of a range of a boiling point is the temperature above which a substance can no longer be liquefied.

The range of a boiling point refers to the difference between the lowest and highest boiling point of a substance. The boiling point of a substance is defined as the temperature at which its vapour pressure is equal to atmospheric pressure and it changes from a liquid to a gas. The normal boiling point is usually used as a reference point to compare the boiling points of different substances.

On the other hand, the end of a boiling point range is defined as the “critical temperature” which is the temperature above which a substance can no longer be liquefied no matter how much pressure is applied. At this temperature, the vapour pressure of the substance is equal to its critical pressure, and it becomes a supercritical fluid.

It's essential to understand that the boiling point range is not a fixed value and can vary based on the pressure and temperature of the surrounding environment. In addition, some substances have a wide boiling point range, while others have a narrow range.

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The greatest mass is in 1mol of Zinc.The mass of one mole of atoms corresponds to any atomic mass on the periodic table. Iron weights 55.845 grams per mole. Zinc weights 65.39 grams per mole.

The number of atoms in both samples is the same (6.02 x 1023), but zinc atoms are larger and heavier. A chemical element that can be found in the periodic table is zinc. Zn is the symbol for zinc, and 30 is its atomic weight. More significantly, the atomic mass of zinc is 65.38, which is necessary for the construction of our converter. In other words, 65.38 grams (65.38 g/mol) of zinc make up one mole.32 × 1023 atoms 6 × 1023 atoms 65 atoms out of 66 2. Zinc's molecular weight : Using the molecular weight calculator and the molar mass of Zn, 1 mole of zinc is equal to 65.38 grams.

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The final pH of the solution is 1.000.

In chemistry, pH, historically denoting "potential of hydrogen", is a scale used to specify the acidity or basicity of an aqueous solution.

We will find the concentration of hydroxide ions (OH^-) and hydrogen ions (H^+) after the reaction between HNO3 and KOH has taken place.

The reaction between HNO3 (nitric acid) and KOH (potassium hydroxide) is:

HNO3 + KOH -> KNO3 + H2O

The initial concentration of H^+ ions in the nitric acid solution is given by the concentration of HNO3:

[H^+] = 0.300 M

We will assume  that the reaction goes to completion, the final concentration of H^+ ions is equal to the initial concentration of OH^- ions, and vice versa:

[H^+] = [OH^-] = 0.100 M

The pH of the solution can then be calculated using the definition of pH:

pH = -log[H^+] = -log(0.100) = 1.000

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An IR-active bond must undergo a change in bond dipole due to vibration. Hence, statement (D) is true.

The vibration that takes place when IR radiation is absorbed must result in a shift in dipole moment for a molecule to become IR active. The alignment of the molecules and the photon's electric vector both affect the dipole moment, which is a vector quantity. As the connection grows and shrinks, the dipole moment changes. The change in dipole moment that takes place during the vibration determines the strength (intensity) of infrared absorption. No absorption will occur when there is no shift in the dipole moment, which prevents the radiation from interacting with the vibration.

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when a narrow diameter glass tube is inserted into a body of water, water rises in the tube and its surface inside is concave upwards. which statement, concerning the strength of the intermolecular forces between glass and water molecules compared to those between water molecules, is accurate

Option c is correct answer,

c) The forces of attraction between the glass and water are stronger than those in water.

Adhesion, which is connected to water's comparatively high surface tension, generates a force. Because the attraction between the glass and the water is often greater than that of the water itself, the concave force develops. You typically see a concave force, which is created when the molecules of the liquid are attracted to the molecules of the container.

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All substances have the same chemical formulas: water (H2O) = hydrogen (2) + oxygen (2); hydrogen peroxide (H2O2) = hydrogen (2) + oxygen (3); and salt (NaCl) = sodium + chlorine.

What makes a complex sentence effective?

A coordinating conjunction (for, and, nor, but, or, still, or so) plus a comma, or a semicolon alone, can be used to combine two independent clauses to form a compound sentence. Example: The pirate captain misplaced her treasure map, yet she still managed to unearth the hidden loot.

What do you mean by compound?

A compound in chemistry is a material comprised of two or more separate chemical elements mixed together in a certain proportion. Chemical connections that are challenging to break are created when the elements interact with one another. These ties develop through.

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The following molecule is neither E or Z configuration , it is the trans configuration.

The cis and trans approach will works  if there is two identical groups that are connected to the double bond.  The E, Z configuration works for the different substituent. the higher priority group on the each carbon is on the same or the opposite side of double bond. It is depends on the priority of the group.

The same group priority are on the same side of carbon double then it will be the Z configuration. If the same priority groups are on the opposite side than the configuration will be E configuration.

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Propylammonium chloride is produced in acid-base reactions (i)CH 3CH 2 CH 2 NH 2 + HCl The formula is (CH 3 CH 2 CH 2 NH 3 + Cl ii) (C 2​ H 5​ ) N+HCl tri-ethyl ammonium chloride C 2​ Oh 5​ N (+) Cl −

Ammonium chloride serves as an expectorant, aiding in the removal of mucus from the lungs and treating cough. Patients experiencing hypochloremia or metabolic alkalosis are treated with ammonium chloride because it helps keep the body's acid-base balance balanced.

Due to its irritative effect on the bronchial mucosa, ammonium chloride could be utilized as an expectorant. As a result, fluid from the respiratory tract is produced, aiding in an efficient cough.

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