A formic acid buffer solution contains 0. 20 m h c o o h hcooh and 0. 24 m h c o o − hcoox−. the pka of formic acid is 3. 75. what is the ph of the buffer?

We have five significant figures in the value 25 , 803 , 000 , 000 mg.

The term significant figures refers to the numbers of figures to which we can assign a mathematical values. The numbers that we refer to here must be non zero numbers.

The implies that we must look out for the values that are nonzero in the digits shown which is 25 , 803 , 000 , 000 mg. A close look at this values shows us that we have five figures that can be assigned values.

Thus we have five significant figures in the value 25 , 803 , 000 , 000 mg.

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Answer:

Explanation:

Hope It Helps!!!!

Answer:

See belwo

Explanation:

First it becomes a compressed gas.... further pressure will cause it to condense into a liquid.

Considering the Dalton's partial pressure, the total pressure in the mixture of gases is 1.371 atm.

The pressure exerted by a particular gas in a mixture is known as its partial pressure.

So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:

[tex]P_{T}[/tex] = [tex]P_{1}+P_{2}+......+P_{n}[/tex]

where n is the amount of gases in the mixture.

Dalton's partial pressure law can also be expressed in terms of the mole fraction of the gas in the mixture.  So in a mixture of two or more gases, the partial pressure of gas A can be expressed as:

[tex]P_{A}[/tex] = [tex]X_{a}P_{T}[/tex]

In this case, the partial pressure of gas H₂ can be expressed as:

[tex]P_{H2}[/tex] = [tex]X_{H2} P_{T}[/tex]

You know:

[tex]P_{H2}[/tex] = 0.48 atm

[tex]X_{H2}[/tex] = 0.35

Replacing in the definition of partial pressure of gas H₂:

[tex]0.48atm = 0.35P_{T}[/tex]

Solving:

[tex]P_{T}[/tex] = [tex]\frac{0.48atm}{0.35}[/tex]

[tex]P_{T}[/tex]= 1.371 atm

In summary, the total pressure in the mixture of gases is 1.371 atm.

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Answer:

Explanation:

The energy of a particle in the box increases proportionally to n-squared. This means that the energy spacings increase at high values of n.

The energy levels of a quantum particle-in-a-box decreases as the quantum number increases.

Quantum numbers can be used to describe the trajectory and the movement of an electron in an atom.

The set of numbers used to describe the position and energy of an electron in an atom is called quantum numbers.

These are the four quantum numbers, i.e., principal quantum number (n), magnetic quantum number (m), azimuthal quantum number (l), and spin quantum number (s).

As the energy levels of a quantum particle-in-a-box decreases as the quantum number increases.

Therefore, The energy levels of a quantum particle-in-a-box decreases as the quantum number increases.

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Answer:

4 M

Explanation:

Molarity can be represented by the following ratio:

Molarity = moles / volume (L)

Since you have been given both the mass and volume, you can plug the values into the equation and solve for molarity.

Molarity = moles / volumes

Molarity = 2.0 moles / 0.50 L

Molarity = 4 M

The electrons that enter the transport chain come from NADH and FADH.

The electron transport chain accepts energy-rich electrons from NADH and FADH 2​ whereas ATP is produced in the previous reactions of aerobic respiration. These processes such as glycolysis, the citric acid cycle, the fatty acid beta-oxidation metabolism, and the oxidation of amino acids occurs before electron transport chain. These processes do the function of transfer of electrons and protons to coenzymes.

So we can conclude that the electrons that enter the transport chain come from NADH and FADH.

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The theoretical yield isopentyl acetate is of the 1.82 g

Now the theoretical yield is the yield of the product as obtained from the stoichiometry of the reaction. In this case, we know the reaction is 1:1.

Mass of  isopentyl alcohol = 0.810 g/mL * 1.5 mL = 1.215 g

Mass of acetic acid = 1.05 g/mL * 2 mL = 2.1 g

Number of moles of  isopentyl alcohol = 1.215 g/88 g/mol = 0.014 moles

Number of moles of acetic acid = 2.1 g /60 g/mol = 0.035 moles

Hence   isopentyl alcohol is the limiting reactant.

1 mole of   isopentyl alcohol yields 1 mole of isopentyl acetate

0.014 moles   isopentyl alcohol yields 0.014 moles of isopentyl acetate

Mass of of isopentyl acetate = 0.014 moles * 130 g/mol = 1.82 g

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The mechanism for the interconversion of α-d-glucose and β-d-glucose in dilute HCl include the proton transfer in first step and nucleophilic attack in second step.

In the first step oxygen donates its lone pair of electron to hydrogen of HCl. There is removal of water molecule from the substance α-d-glucose.

The organic reaction where one nucleophile replaces another is called nucleophilic substitution reaction. These reaction takes place in aromatic compounds, acyl compounds and aliphatic compounds. SN¹ reactions are nucleophilic substitution reaction.

Thus from the above conclusion we can say that The mechanism for the interconversion of α-d-glucose and β-d-glucose in dilute HCl include the proton transfer in first step and nucleophilic attack in second step.

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Answer is although the question should have 3 significant figures.

Fe + CuSO4 --> Cu + FeSO4

It is already balanced

1 mol Fe : 1 mol CuSO4 : 1 mol Cu : 1 mol FeSO4

Fe: 55.8 g/mol

Cu: 63.5 g/mol

number of moles = mass in grams / atomic mass = 93.7 g / 55.8 g/mol = 1.679 mol

1 mol Fe / 1 mol Cu => 1.679 mol Fe / 1.679 mole Cu

mass = atomic mass * number of atoms = 63.5 g/mol * 1.679 moles = 106.6 g = 107 rounded to 3 significant figures.

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3M

3M is the molarity of a koh solution if 200 ml of the solution contains 0. 6 moles KOH.

Molarity : Molarity is defined as the number of moles of solute present in one liter of solution.

We know that,

Molarity = [tex]\frac{n*1000}{v}[/tex]

where,

n = moles of solute of KOH = 0.6

V= volume of solution in ml= 200 ml

Now on substituting the values in the molarity formula,

molarity = [tex]\frac{0.6*1000}{200}[/tex] = 3M/L

Therefore, molarity = 3M

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Hydroplaning occurs when water between the tires and the road builds until the tires begin to ride on a film of water, resulting in traction loss.

The motor vehicles or aircraft tires passing over wet pavement may lose contact with sufficient speed or water depth for a particular given tread design. The tires lose the braking friction required for stopping and start to hydroplane or aquaplane when they come into contact with water. Wet road surfaces can cause tires to hydroplane . This could result in loss of control and steering ability.

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430 g of AgCl would be needed to make a 4.0m solution with a volume of 0.75 L.

Remember that mol/L is the unit of molarity (M).

We can compute the necessary number of moles of solute by multiplying the concentration by the liters of solution, according to dimensional analysis.

0.75L×4.0M=3.0mol

Then, using the periodic table's molar mass for AgCl, convert from moles to grams:

3.0mol×143.321gmol=429.963g

The final step is to round to the correct significant figure, which in this case is two: 430g.

Hence, 430 g of AgCl would be needed to make a 4.0m solution with a volume of 0.75 L.

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Answer: 5kg

Explanation: formula K=1/2mv^2

50=10m

Answer:

C

Explanation:

KE = 1/2 m v^2

KE *2 / v^2   = m

50 (2)/ 10^2   = m =  1 kg

The number of  electrons present in the nonbonding π molecular orbital of the allyl anion is 4 electrons . 2 in the pi bond of the allyl ion and the other two will be present as a lone pair on the carbon atom.

It is a type of orbital that does not affect the bond order or bond length and the bond order of the molecule and does not affect its energy too.

In allyl anion  allyl anion occupies 4 pi electrons and ψ2 is the Highest Occupied Molecular Orbital whereas ψ3* is the Lowest Unoccupied Molecular Orbital

Therefore, the number of  electrons present in the nonbonding π molecular orbital of the allyl anion is 4 electrons . 2 in the pi bond of the allyl ion and the other two will be present as a lone pair in on the carbon atom.

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27.94 g/mole is the molar mass of the unknown gas.

Use Graham's Law, which indicates that the square root of a gas's molar mass determines its rate of effusion.

The following equation compares two distinct gases, (a) and (b), and expresses this:

sqrt(M(b)/M) = R(a)/R(b) (a)

R is the effusion rate.

square root = sqrt

the molar mass, M

In response to your query, if gas (a) is the unknown gas and Xe(M = 131 g/mol) is the second gas, we have:

sqrt(M(Xe)/M(a) = 2.165, where R(a)/R(Xe)

Square both sides, and you get:

(2.165)² = 131 g/mol/ M (a)

M(a)(2.165)² = 131

M(a) is equal to 131/(2.165)² = 27.94 g/mol.

Having a molar mass of 27.94 g/mol, the unknown gas.

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"Transition metal elements" are the type of element which have atomic radii which remain relatively constant across a period.

Periods refer to the horizontal lines of the periodic table. Each period represents the sequential occupation of an atom's valence shell orbitals, also with longer periods representing the employment of an atom's d subshell orbitals.

As the atomic number rises, more electrons, as well as protons,  are present, increasing attraction over time, which drives the atomic radius to shrink over time.

Therefore, "Transition metal elements" are the type of element which have atomic radii which remain relatively constant across a period.

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Ethanoyl chloride is a common acyl chloride. Any other acyl chloride will function similarly.  Similarly, ethanol is regarded as a typical alcoholic beverage. simply substitute the CH3CH2 group with an alkyl group.

The first stage of the reaction (the addition stage) includes a nucleophilic attack on the relatively positive carbon atom by one of the lone pairs on an ethanol molecule's oxygen.

The second stage (elimination) occurs in two stages. The carbon-oxygen double bond reforms in the first step, releasing a chloride ion.

The ethanoyl chloride then removes a hydrogen ion, yielding ethyl ethanoate and hydrogen chloride.

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Answer:

20.4 grams Zn

Explanation:

To find the mass, you first need to find the moles. This can be found using the Ideal Gas Law equation:

PV = nRT

In this equation,

-----> P = pressure (atm)

-----> V = volume (L)

-----> n = moles

-----> R = Ideal Gas Constant (0.08206 atm*L/mol*K)

-----> T = temperature (K)

Before you can plug the values into the equation, you need to convert Celsius to Kelvin.

P = 0.980 atm                   R = 0.08206 atm*L/mol*K

V = 7.80 L                          T = 25.0 °C + 273.15 = 298.15 K

n = ? moles

PV = nRT

(0.980 atm)(7.80 L) = n(0.08206 atm*L/mol*K)(298.15 K)

7.644 = n(24.466)

0.312 moles = n

Now that you have the number of moles, you can convert it to grams using the atomic mass of zinc. The final answer should have 3 sig figs to match the sig figs in the given values.

Atomic Mass (Zn): 65.380 g/mol

0.312 moles Zn           65.380 grams
-------------------------  x  -------------------------  =  20.4 grams Zn
                                         1 mole

The mass (g) of a piece of magnesium wire that produces 41. 8 ml of hydrogen gas collected over water at 21. 0 °c and at a pressure of 752 torr is  0.041 gm.

Calculation,

According to ideal gas equation,

PV = nRT

Where, P is the pressure = 752 torr = 752 mmHg/760 mmHg/atm

P is the pressure in atm = 0.989atm

V is the volume = 41. 8 ml = 0.0418 L

R is the universal gas constant = 0.0821 Latm/mol K

T is the temperature =  21. 0 °C = 21. 0 + 273 = 294 K

n is the number of moles = ?

By putting value of P , V , T , and  R in equation (i) we get,

0.989atm × 0.0418 L = n ×0.0821 Latm/mol K ×294 K

n = 0.989atm × 0.0418 L/0.0821 Latm/mol K×294 K = 0.00171 mol

Number of moles (n) = given mass/ molar mass =  given mass/24.305

Mass = Number of moles×molar mass =  0.00171 mol×24.305 g/mol

Mass of the magnesium wire = 0.041 gm

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Answer:

four

Explanation:

i said so

Mass of aluminum = (1.50 m^3)( 2.70 x 10^3 kg/m^3) = 4050 kg 

The intention of density is the assembly per volume of the substance. This is an intrinsic property consequently the size (or any external feature) does not change this effects.

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Answer: D

Explanation: 4.05 x 10^3 kg

The normal boiling point of fingernail polish remover is 56℃  the vapor pressure of fingernail polish remover at the salon 0.027 atmospheric pressure

The pressure exerted by the vapors due to the atmosphere as it is surrounded by it only is known as vapor pressure and its unit is atm.

As air have small molecules which forms multiple layers and create pressure.

vapor pressure = {1/T1 - 1/T2}

T1 = 56 c

T2 = 22 c

substituting the values,

vapor pressure = [ 1/ 56 - 1 / 22 ]

                         = 0.027 atm.

Therefore, the vapor pressure of nail paint remover is 0.027 atm

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6 gram of sodium hydroxide (NaOH) needed to make 500ml if  0.3  NaOH solution.

Molarity (M) is the amount of a substance in a certain volume of solution.

Molarity is defined as the moles of a solute per liters of a solution.

The unit of molarity is mol/L.

Volume of NaOH = 500 mL

Molarity of the aqueous solution = 0.3 M

Molar mass of NaOH= (23+16+1) g = 40g

Let the mass of NaOH be X.

Now , according to formula number of moles of a given substance = given mass / molar mass

Therefore, no. of moles of NaOH =  X/40

Since, molarity = number of moles of solute/ volume of solution in liter.

Hence,  0.3 = ( X /40) / (500 / 1000)

Solving this we get X= 6g

6 gram of sodium hydroxide (NaOH) needed to make 500ml if  0.3  NaOH solution.

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thermite can be produced from aluminum and iron oxide according to redox reaction.

Redox reaction is defined as the the reaction in which one substance get oxidised and other one is reduced. In other words, Oxidation reduction reaction is called redox reaction.

Oxidation is termed as gain of electron and Reduction is termed as lose of electron.

Thermite is a mixture of an oxide of one metal and a powder of another metal.

Aluminium is usually used as a metal that basically decreases the oxide of the metal.

The thermite contains a mass ratio of ferric oxide and aluminium of 3:1.

It is used to weld broken iron pieces thermally. The reduction of aluminium ferric oxide is extremely exothermic, so the iron produced would be in the molten state.

Fe2O3+2Al→Al2O3+2Fe+heat

Thus, redox reaction of aluminum and ferrous oxide produce thermite.

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The monomers that react together to form polyurethane polymer are diisocyanate and diol.

Polyurethane polymer is made up of monomers diisocyanate and diol. It is mostly used in home furnishing in flexible form. The structures of monomers are as follows:

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An overpack containing four one-liter metal cans of NA1993, Compounds, cleaning liquid, a Class 3 (Flammable liquid), PG III, being offered for transportation by highway, may qualify for specification packaging. This is further explained below.

Generally, The term "specification packaging" refers to a package that meets one of the packaging specifications or standards listed in this subchapter's parts 178 or 179.

In conclusion, It's possible that an overpack that contains four metal cans of one liter each filled with NA1993, Compounds, cleaning liquid, a Class 3 (Flammable liquid), PG III, and that's being provided for transportation on the highway might qualify as specified packing.

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As a gaseous element condenses, the atoms become closer together and they have more attraction for one another.

The transformation of water vapour into liquid is known as condensation. The process is the opposite of evaporation, in which liquid water turns into a vapour. Either the air is chilled to its dew point or it gets too saturated with water vapour to retain any more water, causing condensation to occur.

Attraction - Gas Particles move continuously in a straight path in a gas. They are significantly further apart and move independently of one another because the kinetic energy of the molecule is larger than the attraction force between them. There are often almost no attractive forces between particles.

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Answer:

can u show the answer it give you for the question

The float property allows the positioning of an element to the right or left of other elements.

In the context of web development and CSS, the "float" property is used to control the positioning of elements within a container. It allows you to move an element to the left or right of its containing element, enabling other elements to flow around it.

When an element is floated, it is taken out of the normal flow of the document, allowing other elements to wrap around it. This can be particularly useful for creating layouts where you want elements to appear side by side or to create text flow around images.

The "float" property can take one of two values: "left" or "right". When an element is set to "float: left", it will move to the left of its containing element, and any subsequent elements will wrap around it on the right side. Conversely, when set to "float: right", the element will move to the right, and subsequent elements will wrap around it on the left side.

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A mutation has occurred directly after the start codon within an mrna sequence. A deletion of two nucleotide provided mutation will have the most serious effect on the resulting polypeptide.

The first codon in mRNA transcript is known as start codon.

Start codon provides initiation signals for the ribosomes to start the process of translation during which formation of polypeptide chain takes place.

It arises when the normal sequence of codon is disrupted by the insertion or deletion of one or more nucleotides, provided that the no. of nucleotide which is added or removed is not multiple of three.

Thus, we concluded that the deletion of two nucleotide make frameshift mutation.

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Answer:

Hypernantremia due to excess water loss

A rare disorder that causes the body to make too much urine

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-Levi

Hypernatremia due to excess water loss is a diabetes insipidus. Hence option A is correct.

Hypernatremia is defined as an increase in serum sodium levels to a level greater than 145 mmol/L. Water leaks from the tissues into the bloodstream as a result of hypernatremia, which can induce cell shrinkage. Additionally, it affects the hormone levels that regulate salt levels, leading to an increase in thirst and more concentrated urine production.

Diabetes insipidus is defined as a rare illness that makes you almost insatiably thirsty and produces copious amounts of urine. A brain tumor that affects the hypothalamus or pituitary gland is one of the three most frequent causes of cranial diabetes insipidus. a severe head injury that damages the pituitary or hypothalamus. complications resulting from pituitary or brain surgery.

Thus, Hypernatremia due to excess water loss is a diabetes insipidus. Hence option A is correct.

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