the ph of a 0.10 m solution of a weak base is 9.82. what is the kb for this base

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 2.78g  is the mass of HCl.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

Molarity= number of moles of solute/volume of solution in litre

Where,

moles= given weight /by molecular weight

         = w/ 36.46

Substituting values in equation 1

0.612=(w/36.46)/( 125/1000)

w=0.80g

Therefore, 2.78g is the mass of HCl.

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Based on the figure above, the boiling point of ethyl alcohol under the external pressure of 0.658 atm is option A 40 C

We know for Ethyl alcohol the boiling point at 1atm pressure is 78.37°C= 351.37K. Final pressure is 0.658atm. we know P1\P2=T1\T2 ==> T2= 0.658×351.37=231.20K= 40°C (option A). So option A is correct. The boiling point of a substance is the temperature at which it changes from a liquid to a gas (vapor) at a given pressure. At the boiling point, the vapor pressure of a liquid is equal to the pressure of the surrounding atmosphere. For a given pressure, different substances have different boiling points. The boiling point of a substance can also be affected by changes in pressure; for example, at higher altitudes, the atmospheric pressure is lower, so the boiling point of a liquid will be lower.Boiling points are a physical property of a substance and are commonly used to identify and separate different compounds in a mixture. For example, in the process of distillation, different compounds in a mixture are separated based on their different boiling points.

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the complete question is :

Based on the figure above, the boiling point of ethyl alcohol under the external pressure of 0.658 atm is ___ C?

A. 40

B.80

C.60

D.70

E.20

The structures A, B, C and D are allylic bromides that are products of the reaction. Hence, Option A, B, C, D is the correct answer. And Option E, F, G are not allylic bromides, they are not formed as products of the reaction.

The bromination of an alkene with N-bromosuccinimide (NBS) in the presence of light or peroxide is a radical reaction that occurs at the allylic position of the alkene. The allylic radical intermediate is formed by cleavage of the N-Br bond in NBS and attack of the radical on the alkene. This reaction generates an allylic bromides as the final product.

The structure of 3-methylcyclopentene is:

H3C CH2

\ |

CH CH2

/ |

H3C CH2

The structures A, B, C and D are allylic bromides that are products of the reaction.

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Answer:

A blue-eyed man and a brown-eyed woman have two children, both of whom have brown eyes.

Explanation:

An enolate is an intermediate in the bromination of ketones under acidic conditions

An enolate is a type of carbanion intermediate that is formed by the deprotonation of a carbonyl group in an aldehyde or a ketone. It has a negatively charged carbon atom that is adjacent to a double-bonded oxygen atom (C=O) in the carbonyl group. Enolate intermediate can be formed by the addition of a strong base to a carbonyl compound, such as lithium diisopropylamide (LDA) or sodium hydride (NaH). Once formed, enolates can participate in a variety of chemical reactions, such as nucleophilic addition and substitution, condensation, and elimination reactions.

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Answer:

A. Zinc react with oxygen to form zinc oxide

heat  transferred per mole of NH3(g) formed in the reaction shown below N2(g) + 3 H2(g) ? 2 NH3(g) ?H = – 92.2 kJ is -46.1 kJ/mole.

The heat transferred per mole of NH3(g) formed in the reaction can be calculated using the enthalpy change (ΔH) of the reaction, which is given as -92.2 kJ. The reaction is:

N2(g) + 3 H2(g) → 2 NH3(g). The coefficient of NH3(g) in the balanced equation is 2. Therefore, 2 moles of NH3(g) are formed for every mole of N2(g) and 3 moles of H2(g) that react. So, the heat transferred per mole of NH3(g) formed is -92.2 kJ/2 moles = -46.1 kJ/mole.

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Based on the hydrogen atom's spectrum, he postulated that the lines were caused by light being emitted or absorbed as an electron changed orbits within the atom (option b).

The majority of stars and the sun contain hydrogen, and Jupiter is primarily made of this element. Water is the form of hydrogen that is present on Earth in the highest amounts. Only very small amounts of it—less than 1 part per million by volume—are present in the atmosphere as a gas.

To produce energy, power, and heat, hydrogen can be used in fuel cells. Nowadays, transportation and fertilizer manufacturing are the two uses of hydrogen that are most prevalent.

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Answer:

see below

Explanation:

wavelength of UV light= 2.94 * 10-⁸m .

we need to find out its frequency,

As we know that,

[tex]v = f \lambda [/tex]

hence,

3 * 10⁸ m/s = f * 2.94 * 10-⁸m

f = 3/2.94 *10⁸*10⁸

f = 1.02 * 10¹⁶s-¹

and we are done!

Answer:

i agwee!

Explanation:

Yash they are right

Answer:c= 21 k=294 height= 6.2 volume= 0.78

Strong acids almost entirely transfer their protons to the solvent molecules, including HCl, HClO4, and HI.

a way to measure how basic or acidic a substance or solution is. The pH scale has numbers 0 through 14. On this scale, a pH value of 7 is regarded as neutral, indicating it is neither acidic nor basic.

The hydronium ion concentration in moles per liter must be known in order to estimate the pH of an aqueous solution (molarity). Using the formula pH = - log [H3O+], the pH is then determined. Take a 0.0025 M HCl solution as an example, and calculate its pH. Since it is potent and completely ionized in water, HCl qualifies as an acid.

(a)    0.16 M HCl

       pH = -log[H+] = -log[0.16] = 0.79

       pH = 0.79

(b)    4.4 M HClO4

        pH = -log[H+] = -log[4.4] = -0.64

        pH = -0.64 (negative sign)

(c)    2.3???10?11 M HI

Here we have typo error 2.3???10?11 M HI instaed of 2.3 x 10-11 M

[H3O+]total = [HA]acid + [H3O+]water

[H3O+]total = [HA]acid + [OH-]water (since, [H3O+]water = [OH-]water)

[H3O+]total = [HA]acid + [OH-]water = (2.3e-11) + (9.99e-8) = 9.9923e-8

pH = -log[[H3O+]total] = -log[9.9923e-8] = 7.00

pH = 7.00

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Electronically, group 14 elements have the [noble gas]ns2 np2 general valence shell configuration. As a result, Option (a) is accurate. Sn, Pb, Ge, Si, and C

The shell number (n) is the first symbol used to represent an electron configuration, followed by the kind of orbital and the superscript number of electrons in the orbital. Consider this: The periodic table reveals that oxygen contains eight electrons.

Orbital occupancy, the Pauli exclusion principle, Hund's rule, and the Aufbau process are known to be the primary "tools" we have for expressing electron configurations. Orbitals are occupied in a particular sequence,

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C) The oxidation of 3 mol of glucose by the pentose phosphate pathway may result within the generation of 3 mol of pentose, 6 mol of NADPH, and 3 mol of CO2.

2 NADPH Four modes of the pentose phosphate pathway, each adapted to the era of a item required by a specific cell. In mode 1, 1 atom of glucose-6-phosphate (G6P) makes 5 particles of ribose-5-phosphate (5R5P). In mode 2, 1 particle of G6P makes 1 atom of R5P and 2 NADPH.

In add up to, a arrangement of PPP responses cycle 6 particles of glucose-6-phosphate to 5 particles of glucose-6-phosphate, 12 NADPH and 6 CO2 [18]. Figure 4.4 appears a conspire of all responses inside the PPP. NADPH is primarily utilized for greasy corrosive amalgamation, pyruvate oxidation to malate, and the decrease of glutathione.

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Spontaneous processes are often said to be "downhill" in free energy because they release energy in the form of heat and/or work.

The energy released during a spontaneous process is represented by a decrease in the free energy (ΔG) of the system. Free energy is a thermodynamic function that takes into account both the internal energy (U) and the entropy (S) of a system. A spontaneous process occurs when the free energy of the system decreases, which means that the internal energy of the system decreases and/or the entropy of the system increases. The free energy of a system is also related to the potential energy of the system. The potential energy of a system is the energy it possesses as a result of its position or configuration. When a system undergoes a spontaneous process, the potential energy of the system decreases, just like the free energy. Imagine a ball placed on a hilltop, the ball has potential energy because of its position, and that potential energy can be converted into kinetic energy when the ball is allowed to roll down the hill. Similarly, the potential energy of a system can be converted into heat or work during a spontaneous process. Therefore, spontaneous processes are often described as "downhill" in free energy because they involve a decrease in the potential energy of the system, similar to a ball rolling downhill. The decrease in potential energy of the system is accompanied by the release of energy in the form of heat and/or work, which makes the process spontaneous.

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The following polluting gases do not directly create O3 in a combustion engine.

Therefore, either propane, butane, or a combination of the two is the type of gas used in dwellings. Natural gas (also known as mains gas) and compressed natural gas (CNG), both of which include methane, are the two types of gas used in homes. Hydrocarbon gases include propane, butane, and natural gas.

Common gases include oxygen, nitrogen, sulphur dioxide, argon, and a few more substances. See how these chemicals are used in daily life and how they assist us in the paragraphs below.

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Answer: C. Both will dissociate.

Explanation: Polar molecules dissociate in water because they can hydrogen bond. This allows them to hydrogen bond with other water molecules which are also Polar. In general, Polar molecules dissolve in other polar solutions.

Ionic compounds dissolve in water because they can form Ion-Dipole interactions. The cation of the Ionic compound attracts the negative part of the water molecule while the anion attracts the positive part of the water molecule.

In order to react with 3.15 g of N2, we would need 6.3 grams of H2. This is because the balanced chemical equation for the reaction of nitrogen (N2) and hydrogen (H2) to form ammonia (NH3) is:

N2 + 3H2 → 2NH3

So for every 1 mole of N2, we need 3 moles of H2. Since the molar mass of N2 is 28.02 g/mol and that of H2 is 2.02 g/mol, we can use the following conversion to find the number of grams of H2 needed:

3.15 g N2 x (3 moles H2/1 mole N2) x (2.02 g H2/1 mole H2) = 6.3 g H2

Octane is an alkane with the chemical formula C8H18 and the condensed structural structure CH3(CH2)6CH3.

An element is a fundamental thing that is challenging to break down into smaller components. In chemistry and physics, an element is a substance that cannot be broken by non-nuclear processes. In mathematics and computers, an element is a special part of a larger system or set. In chemistry, a simple material is referred to as one that cannot be broken down into smaller components or changed into another chemical. An element is made up of atoms, which are composed of protons, neutrons, and electrons. Each of an element's atoms contains a set number of protons.

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The solubility of PbI2 in 0.025 M KI is 4.5 × 10^-2 M, which is answer choice A.

A substance's solubility in chemistry refers to its capacity to combine well with another substance—the solvent—to form a solution. The ability of the solute to produce such a solution is required for solubility, which is the opposite attribute.

The concentration of the solute in a saturated solution, a solution in which no more solute can be dissolved, is the standard measurement of the solubility of a material in a particular solvent.

To calculate the solubility of PbI2 in 0.025 M KI, we can use the expression for Ksp, which is the equilibrium constant for a solid substance dissolving in a solution. The expression for Ksp is [Pb2+][I-]^2 = Ksp. Since we know the Ksp value for PbI2 and the concentration of I- ions in the solution, we can use this expression to calculate the solubility of PbI2.

Given that Ksp(PbI2) = 7.9 × 10^-9 and [I-] = 0.025 M, we can substitute these values into the Ksp expression:

[Pb2+][I-]^2 = 7.9 × 10^-9

Solving for [Pb2+], we get:

[Pb2+] = sqrt(7.9 x 10^-9 / 0.025) = 4.5 × 10^-2 M

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Half-reaction for the oxidation of the manganese in MnCO3 to MnO2 in neutral groundwater is : MnCO₃ + 2H₂O → MnO₂  + HCO₃⁻ + 2e- + 3H+

A half-reaction is the part of overall reaction that represents, either  oxidation or a reduction.

MnCO₃ → MnO₂  + HCO₃⁻

This equation is not balanced.

Oxidation number of Mn changes from +2 in MnCO₃  to +4 in MnO₂ , thus two electrons must be added to the right.

Then the equation becomes; MnCO₃  → MnO₂  + HCO₃⁻ + 2e-

In terms of electrons, now the reaction is balanced. But, in terms of charges it is not.

In reactant side, total charge = 0 and in the product side, total charge = -1 + (-2) = -3

To balance the excess negative charge, add add 3 H+ on the product side; MnCO₃ → MnO₂  + HCO₃⁻ + 2e- + 3H+

In terms of charges, now the reaction is balanced but in terms of atoms it is not.

There is excesses of Hydrogen and Oxygen atoms. So, to balance this, add H20 to the reactant side to balance H and O atoms

This gives; MnCO₃ + 2H₂O → MnO₂  + HCO₃⁻ + 2e- + 3H+

Now, the equation is balanced.

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Two gases that do not react with each other are placed in the same container, they will mix completely with each other. This can be solved using the concept of gaseous mixture.

The ability of gases to mix with one another is one of their characteristics. As a result, they combine to form a solution, or a homogenous combination. If we know the makeup of the gases in the mixture, it is simple to determine some of the characteristics of the combination. Each element in the gas phase of a combination of gases can be handled independently.

When a mixture of gases is kept in the same container, each gas has that container's volume.

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The pH of a 7.5 × 10^-3 M Ba(OH)2 solution at 25°C : c)12.18 . Hence c) is the correct option.

In chemistry, pH is a scale used to specify the acidity or basicity of an aqueous solution. pH is measured on scale of 0 to 14. pH value of 7 is neutral, which implies it is neither acidic nor basic. pH value of less than 7 means it is more acidic and pH value of more than 7 means it is more basic.

Ba(OH)2 -> Ba 2+ + 2OH-

7.5 × 10^-3 x 2 = 0.015 mol/L OH-

pOH = -log ( 0.015) = 1.823

pOH + pH = 14

pH = 14 - 1.823 = 12.18

pH is 12.18.

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Answer:

2. 2F2O3 = 4Fe + 3O2

3. 2Na + Cl2 = 2NaCl

4. 2HgO = 2Hg + O2

5. TiCl4 + O2 = TiO2 + 2Cl2

6. 4Al + 3O2 = 2Al2O3

7. 2HCl + Zn = H2 + ZnCl2

8. 2Al + 3CuCl2 = 2AlCl3 + 3Cu.

Equations A and B would need to be reversed.

We know that sometimes, we can only be able to obtain the correct equations when we can be able to sift through the equations that have been given as we have in this case.

Let it be known that the equation of the reactions do occur in steps and the end product would be the formation of the HCN. We have to reverse some of the reactions in order to obtain the equation that is desired in the question above as by the use of the adding of equations.

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Answer: 5356.091400000158

Explanation:

Engineering includes the study of science, universe, space, and logic and is therefore denoted as option B.

This is referred to as the branch of science and technology concerned with the design, building, and use of engines, machines, and structures which helps to make work easier and faster.

It is also studied in schools and has various divisions such as mechanical, chemical engineering etc and it involves the study of science, universe, space, and logic which are encountered when dealing with this broad subject and is therefore the reason why option B was chosen as the most correct choice.

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a) The rate of change of volume with respect to pressure is -C/P².

b) The P is in the denominator and when the denominator will increase, the value of the function will decrease.

c) The formula for isothermal compressibility in terms of P is 18/P.

When a gas is maintained at a constant temperature, it behaves according to Boyle's Law, a fundamental chemistry principle. According to the law, a gas's volume is inversely related to the pressure it exerts at a given temperature.

a. According to the Boyle's law, we have

PV = C

V = C/P = CP⁻¹

So using the chain rule, the rate of change of volume with respect to pressure is

dV/dP = C×(-1P⁻¹⁻¹)

dV/dP = C×(-1P⁻²)

dV/dP = -C/P²

(b) From the formula for dV/dP, we see that as P increases,

the absolute value of dV/dP decreases

Given that P is in the denominator, the value of the function will decrease as the denominator increases. Consequently, the volume starts off rising more quickly.

thus the volume is increasing more rapidly at the begininh.

(c) The formula for the isothermal compressibility is given by

β = -1/V dV/dP
β = -1/V (-C/P²)

β = C/VP²

β = C/PV.P

β = C/C.P

β = 18/P.

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The ratio of the molar concentrations of H2PO₄⁻ to H3PO₄ is 0.09

The ratio of the molar concentrations of at a pH of 7.40, CO₃²⁻ to HCO₃⁻ is 1:1.

The number of moles of a solute per liter of solution is referred to as molar concentration or molarity.

When the reaction's balanced equation is

H₂CO₃(aq) → HCO₃ -(aq) + (H⁺)

Ka = 4.3 x10⁻⁷ and  PH = 7.4

To get PKa = -㏒ Ka

PKa = -㏒(4.3x10⁻⁷) = 6.37 by changing the Pka value in the formula below:

PH = Pka + ㏒[salt/acid]

PH= PKa + ㏒[HCO3-]/[H2CO3]

㏒[HCO⁻₃]/[H₂CO₃] = PH-Pka

[HCO₃⁻] /[H₂CO₃] = 10^(7.4 - 6.37)

∴[HCO₃⁻]/[H₂CO₃] = 11.7

∴[H₂CO₃]/[HCO₃⁻] = 1/11.7 =  0.09

This is due to the fact that the two ions are in equilibrium at a pH of 7.40, which means that for every HCO₃ molecule produced, there is also one molecule of CO₃²⁻ produced. This is as a result of the following response:

CO₂(carbon dioxide) + H₂O ⇌ H₂CO₃ ⇌ HCO₃⁻ + H⁺ ⇌ CO₃²⁻ + 2H⁺

The reaction is in equilibrium at a pH of 7.40. In light of this, the molar ratio of CO₃²⁻ to HCO₃ is 1:1.

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Carbon and Nitrogen are present as the central atoms in CH3NH2. Carbon forms sigma bonds with Nitrogen and three surrounding Hydrogen atoms.

The carbon atom acquires an sp3 hybridization state as a result. With the nearby atoms, nitrogen forms three sigma bonds. Methanamine is the substance mentioned. The inner atoms of the given molecule are carbon and nitrogen. To determine whether carbon and nitrogen are hybridised, we must first write down their electrical configurations.

The electrical configuration of carbon is and its atomic number is six.  of one s orbital and three p orbitals. All four of the hybrid orbitals are used for bonding.

Carbon has undergone sp3 hybridization as a result. Nitrogen has an atomic number of seven and an electronic configuration of 1s22s22p3. One s orbital and three p orbitals combine to generate four through hybridization.

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Pyridinium chlorochromate is the best choice for oxidizing a primary alcohol to an aldehyde.

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