Calculate the concentration of clo2− at equilibrium if the initial concentration of hclo2 is 2. 25×10^−2 m.

Nitrous acid, hno2, has an acid dissociation constant - ka of 7. 1 ✕ 10-4. what are [h3o ], [no2-], and [oh -] in 0. 40 m hno2 - 4829 M [OH^-] = 1.439 x 10^-14 M

The acid dissociation constant (Ka) is used to differentiate between strong and weak acids. Strong acids have very high Ka values. The Ka value is determined by examining the equilibrium constant for acid dissociation. The acid dissociates more readily as the Ka increases.

The original molecular definition of an acid, according to Arrhenius, is a molecule that dissociates in an aqueous solution, releasing the hydrogen ion H+ (a proton): HA A + H+. acid dissociation constant is an equilibrium constant for this dissociation reaction.  

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Answer:

B) ATP to ADP

Explanation:

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The pH of the solution is determined by the hydrogen ion concentration. The pH of the solution with 1.5 M ammonia and 0.50 M hydrochloric acid is 8.77.

The potential of the hydrogen ion in the solution is called pH which determines the basicity and acidity of the solution.  

Given,

The molar concentration of 500 mL ammonia = 1.5 M

The molar concentration of 500 mL hydrochloric acid = 0.50 M

Kb (NH₃) = 1. 8 x 10⁻⁵

First, pOH is calculated as,

pOH = pKb + log [NH₃][HCl]

= - log 1. 8 x 10⁻⁵ + log [1.5][0.50]

= - log 1. 8 x 10⁻⁵ + log [3]

= 4.744 + 0.477

= 5.221

Now, pH is calculated from pOH as,

pH = 14 - pOH

= 14 - 5.221

= 8.77

Therefore, 8.77 is the pH.

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The enol carbon or ∝-carbon  nucleophile attacks at molecular bromine in the acid-catalyzed α-bromination of a ketone

Treatment of ketones with bromine in the presence of acid will results in formation of a new C-Br bond at the alpha position. The purpose of the acid  is to catalysed formation of the enol from ketone , which is active nucleophile in the reaction. This reaction is called haloform reaction which is used to identify the methyl substituted ketone in the presence of aldehyde.

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Urine color is the most effective method for measuring hydration status before and after exercise

Urine color is yellow color from a pigment called urochrome or urobilin. Darker pee contains less fluid, whereas lighter urine is more diluted. Dehydration may be indicated by very black urine. Don't worry if your urine doesn't match the color scheme.

Normal urine color is a pale yellow, however light amber is also acceptable. If your pee appears dark amber, you may be dehydrated and should drink additional water to compensate. Urine naturally contains yellow pigments known as urobilin or urochrome. The darker the pee, the more concentrated it is. Dehydration is the most common cause of dark urine color

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Yes the system is at equilibrium if reactants and products are at equilibrium at 10⁻³ < K <10³.\

When opposing reactions are happening at the same pace, chemical equilibrium happens.

                                     [tex]N_2O_4 (g)[/tex] → [tex]2 NO _2(g)[/tex]

We represent the system's equation with a double arrow since the forward and reverse processes are both active in an equilibrium state.

Forward Reaction:                               Rate Law:

[tex]N_2O_4(g)[/tex] → [tex]2 NO_2 (g)[/tex]                              Rate = [tex]k_f [N_2O_4][/tex]

Reverse Reaction:                                Rate Law:

[tex]2 NO_2 (g)[/tex] → [tex]N_2O_4(g)[/tex]                               Rate = [tex]k_f [NO_2]^2[/tex]

Therefore at equilibrium;

[tex]Rate_f=Rate_r\\[/tex]

[tex]k_f[N_O_4] = k_r[NO_2]^2[/tex]

It becomes:

[tex]\frac{k_f}{k_r} = \frac{[NO_2]^2}{[N_2O_4]} \\[/tex]

[tex]K_e_q = \frac{k_f}{k_r} = \frac{[NO_2]^2}{[N_2O_4]} = a constant[/tex]

The reciprocal of the equilibrium constant of the forward reaction is the equilibrium constant of a reaction moving in the opposite direction.

The reaction is said to have a large amount of both reactants and products at equilibrium at 10⁻³ < K <10³.

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340. ml of a 0. 150 m solution of nh3(aq) is titrated with 0. 100 m hcl.  the ph will be 7 of the solution after 350. ml of hcl has been added. (ka(nh4 ) = 5. 6 x 10-10).

The ph. of a solution gives information about the concentration of hydrogen ion in the solution or the solution is acidic or basic in nature if the given value is 7 then the solution is neutral or greater then 7 then basic and less then 7 then acidic.

Here, NH3 is a base while adding HCl to it the reaction gets neutralized and known as  neutralizatio reaction and attend the ph. of value 7.

After due to the formation of hydronium ion the ph. would be less then 7.

Therefore, the ph. is 7.

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Semiconductors show the property of both the conductor and insulator. They are more effective than metals as their valence electron can free flow by the sun's energy. Thus, option B is correct.

Semiconductors are substances and materials that exhibit intermediate properties of conductors and insulators. They are solid materials that can conduct electrical charges due to the added impurity or change in temperature.

They have a valence electron in their outer shell that can absorb the energy from the sun to get excited. This leads to the flow of the charge in the semiconducting substance more easily.

Therefore, option B. the semiconductors can absorb the extra energy is correct.

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Your question is incomplete, but most probably your full question was, Semiconductors are more effective than metals as converters of solar radiation into electricity because

A. it is easier for the atoms of a semiconductor to absorb solar energy and to move from place to place within the solid, thereby conducting electricity.

B. the energy contained in sunlight gives the valence electrons in the semiconductor atoms the extra energy they need to "flow" throughout the solid.

C. metals melt much too easily under direct sunlight and, as liquids, lose their ability to conduct electricity.

D. solar radiation has sufficient energy to knock electrons completely off the metal surface, making it impossible for the electrons to "flow" from atom to atom and conduct electricity.

The  type of bond connects the fatty acid will be " an ester bond".

Fatty acids could be joined to each of the three carbons of the glycerol molecule in a fat molecule by an ester bond that passes through into the oxygen atom. Three molecules are emitted during the establishment of the ester bond. Fats were also known as triacylglycerols as well as triglycerides because they are made consisting of three fatty acids and glycerol.

The three major nutrients in a diet may be carbohydrates, proteins, and fats. According to how many hydrogen bonds they contain, fats are classified as either saturated as well as unsaturated.

The  type of bond connects the fatty acid will be " an ester bond".

Hence, the correct answer will be option (c)

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Heya....

Here's your answer.....

PV = nRT... R is a constant...

so PV/nT = constant...

P1V1 / n1T1 = P2V2 / n2T2...P is constant.T is constant.. so

V1 / n1 = V2 / n2

since n = mass / mw

V1 / (mass 1 / mw) = V2 / (mass 2 / mw)

and since molecular mass = constant

V1 / mass 1 = V2 / mass 2

mass 2 = V2 x mass 1 / V1 = 2.90L x 2.00 g / 2.00 L = 2.9 g

mass 2 - mass 1 = 2.90 g - 2.00 g = 0.90 g

ie.. 0.90 g of He was added.

Thanks...!!!

option (B) KOH is the correct answer

KOH is the substance that, when added to the solution, is most likely to raise the pH .

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Lithium metal reacts with nitrogen gas to form lithium nitride the balanced chemical equation will be 6Li + N₂ → 2Li₃N.

In a balanced chemical reaction, the number of moles that are present at the side of the reactant must be always equal to the side of product formation this is known as a balanced chemical equation.

The balanced chemical reaction will be 6Li + N₂ → 2Li₃N.

Here 6 moles of lithium is reacting with one nitrogen but as it is in gaseous state it is N₂ after reacting with lithium it will give two moles

Therefore, balanced equation will be 6Li + N₂ → 2Li₃N

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299.7 moles of electrons are required to produce 99. 9 g of aluminum metal from a sample of molten aluminum fluoride.

Calculation,

The production of aluminium metal is given as,

[tex]Al^{+3} + 3e^{-}[/tex]→ [tex]Al[/tex]

The 3 moles of electrons require to produce 1 gm of atom of aluminium ( weight = 27 ) solution fluoride.

The number of moles of electrons are required to produce 99. 9 g of aluminum metal from a sample of molten aluminum fluoride = 3mol×99.9g/1g

The number of moles of electrons are required to produce 99. 9 g of aluminum metal from a sample of molten aluminum fluoride = 299.7 moles

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Answer:

A.) 6.35

Explanation:

To find the mass of MgCl₂, you need to multiply the given value by the molar mass. The molar mass is made up of each element's atomic mass times their quantities. It is important to arrange the conversion in a way that allows for the cancellation of units.

Atomic Mass (Mg): 24.305 g/mol

Atomic Mass (Cl): 35.453 g/mol

Molar Mass (MgCl₂): 24.305 g/mol + 2(35.453 g/mol)

Molar Mass (MgCl₂): 95.211 g/mol

0.0667 moles MgCl₂           95.211 grams
---------------------------------  x  ------------------------  = 6.35 grams MgCl₂
                                                   1 mole

The mass percentage of KCl solution is 21.34%

Calculation,

Given molality of KCl aqueous solution =  3. 64  m =  3. 64 mole/ Kg

It means 3. 64 mole of solute present in 1Kg of solvent

or ,  3. 64 mole of solute present in 1000 g of solvent ( water )

Mass of solute ( KCl ) =  3. 64 mole×74.55 g/mole =271.3 g

The total mass of solution ( KCl + water ) = 271.3 g + 1000 g = 1271.3 g

Mass percentage is equal to percentage of mass of solute present in total mass of solution.

Mass percentage = 100×271.3 g/1271.3 g = 21.34%

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The 2.5 x 10²¹ molecules of CH₃OH have 0.00415 moles.

The number of moles is given by

[tex]n=\frac{m}{M}[/tex]

When given mass = molar mass of a substance, then no of moles is equal to 1 which is equivalent to 6.022 x 10²³.

We also know,

1 mole has 6.022 x 10²³ molecules of CH₃OH

According to the mole concept,

6.022 x 10²³ molecules of CH₃OH is equal to 1 mole

2.5 x 10²¹molecules of CH₃OH is equal to [tex]\frac{2.5\times10^2^1}{6.022 \times 10^2^3}[/tex] moles

Thus, 2.5 x 10²¹molecules of CH₃OH are equal to 4.15 x 10⁻³ moles or 0.00415 moles

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Answer:

Molarity = 2 M

Explanation:

The molarity can be found using the molarity ratio:

Molarity = moles / volume (L)

You can plug the given moles and volume into the ratio and solve.

Molarity = moles / volume

Molarity = 1 mole / 0.500 L

Molarity = 2 M

Answer:

a phosphatidylcholine

The molecule that  contains sphingosine is a  phosphatidylcholine compound.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.

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When Na3po4 dissolves in water to produce an electrolytic solution. The osmolarity of a 2. 0 × 10-3 m Na3po4 solution is 0.008osmol/L.

Osmolarity is defined as the number of osmoles of solute particles per unit volume of the solution.

In other words osmolarity is the multiple if molarity

Osmolarity = i× molarity

Here i represents the van't Hoff factor,

[tex]Na_{3}PO_{4}[/tex] ⇒ [tex]3Na^{+} + PO_{4} ^{-}[/tex]

3  Moles of [tex]Na_{} ^{+}[/tex] + 1 mole [tex]PO_{4} ^{-}[/tex] = 4

The number of moles of particles of solute produced in solution are actually called osmoles.

As a result, the van't Hoff factor will be equal to

i=4 Moles ions produced (osmoles) 1mole [tex]Na_{3} PO_{4}[/tex] .dissolved =4

Since we know that,

[tex]Na_{3} PO_{4}[/tex] = [tex]2.0 * 10^{-3} M[/tex]

Osmolarity =

[tex]4*2.0*10^{-3} M[/tex] = [tex]8.0 * 10^{-3} osmol L -10s[/tex]

Thus, the Osmolarity of given solution is 0.008 osmol/L.

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Yes, we can use this balance to  estimate the mass to the nearest milligram.

The weighing balance is the kind of scale that can be used to measure the mass of a body. We know that mass is the quantity of matter that is contained in a  body and the the SI unit of mass is the kilogram.

Looking at the balance as it is graduated in milligrams, we know that measurement to the nearest gram means measurement to the nearest whole number so we can say that the answer is yes. We can use this balance to  estimate the mass to the nearest milligram.

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The given pH scale range from [tex]0-3[/tex] indicates the strong acid.

The pH scale, which ranges from [tex]0 -14[/tex], was developed by Sorensen to quantitatively define the strength of an acid and a base.

A pH value indicates the amounts of hydrogen ions and, hydroxide ions present. The negative logarithm of the hydrogen ion concentration is referred to as pH and is represented by:

[tex]pH = -log [H^{+} ][/tex]

For acids, the pH value is always less than [tex]7[/tex].

For bases, the pH value is always more than [tex]7[/tex].

For neutral solution, pH value is equal to [tex]7[/tex].

Thus, for the provided pH scale range [tex]0-3[/tex], it represents strong acid which will give large concentration of protons on dissociation. since lower pH value indicates higher concentration of protons created by an acid.

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The molarity of an aqueous solution of isopropanol = 15.09 mol/L

Molality = 12.79 m

This gives that 12.79 moles of isopropanol is dissolved in 1000 grams of water.

Density = 1.180 g/mL

We know that,

Density= mass/volume

volume = mass/density

            = 1000/1.180

Volume = 847.46 ml

Molarity can be defined as the mass of solute per liter of the solution.

Molarity = moles × 1000/volume ------> (1)

The moles of isopropanol in 847.46 ml solution is 12.79.

On substituting in (1)

Molarity = 12.79 × 1000/847.46

Molarity= 15.09 mol/L

The molarity of aqueous solution of isopropanol is 15.09 mol/L

The number of moles of solute in a solution equal to 1 kg or 1000 g of solvent is referred to as its molality.

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The statement that the concentration of carbon will not change if gaseous water is added to the system is false. The concentration of carbon will increase.

Concentration of a substance is the present of a substance in a per-unit square of an area. It is the total amount of solute present in the solution.

The equilibrium is C(s) + H₂O(g) < - > CO(g) + H₂(g), ΔH = 2296 J.

If we increase or add the gaseous water in the system, the amount of carbon will increase because the carbon is a gas, and increasing the pressure will increase the volume of the gas, at Constant temperature.

Thus, the statement is false.

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The pH of blood if pco2 drops to 35.0 mmhg is 7.459

The pH of the blood can be calculated using the Henderson- Hasselbalch equation, it explains the relation between acid dissociation constant pKa and pH in biological and chemical systems.

pH = pK + log ( HCO3- / ( 0.03 * PCO2 ) )

pK is 6.1 for bicarbonate buffer system.

HCO3- = 24mm

PCO2  = 35.0 mmhg

pH = 6.1 + log ( 24 / 0.03 * 35.0 )

     = 6.1 + log ( 24 / 1.05 )

     = 6.1 + log 22.8571

     = 6.1 + 1.3590

     = 7.459

Hence, the pH of blood is 7.459

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The compound that would have the highest osmotic pressure when dissolved in water is [tex]FeCl_{3}[/tex] .

So,  option D is correct one.

The dissociation of one molecule of  [tex]FeCl_{3}[/tex] gives the maximum number of ions when dissolved in water ( 4 ions ) . Osmotic pressure is a colligative property and depends upon number of solute particles present in the solution . The solution having maximum number of solute particles will have maximum number of the osmotic pressure .

All other given molecules gives less number of number of ions when dissolved in water as compare to of  [tex]FeCl_{3}[/tex] .

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Electron configurations for all the group 18 noble gases have eight electrons in their valence shell in common.

Noble gases are the gases that contain Eight electrons in their valence shells and are placed in Group 18 of the periodic table. The octet of Noble gases is complete. They are inert in nature since they have complete valence shells. They are not much abundant in nature due to their inert behaviour.

They are stable and realtively unreactive as compared to other members of the peiodic table.

Some other factors that remain common for noble gases:

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The chlorine molecules, cl2, would behave if mixed with water is best described by the polarity concept.

Polarity is a phenomena by which the dissolving power of any molecule can be known if they are polar will completely dissociate in water and if non polar will partially dissociate in water

Here chlorine is very poorly dissolve in water due to its non polar nature and water is polar. Some compounds are polar for short time of period and attend a partially positive and a partially negative charge within them.

Therefore,  Cl2 is a non polar compound describes the polarity.

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Answer:

instantaneous rate would be the term.