If the k for a reaction is determined to 5. 37 at 21. 29 ºc, then what is δg for the reaction (in j/mol, round to the nearest one)?

The carboxylate ion formed is (CH3)2CHCH2COO^- and H3O+.

What is carboxylate ion?

The carboxylate ion is the conjugate base of carboxylic acid with the group RCOO-. This can be formed by adding a base to carboxylic acid where it is deprotonated to give carboxylate anion. It contains a single negative charge because of the absence of H+.

The reaction of carboxylate ion formation can be written as,

(CH3)2CHCH2COOH + H2O ------->  (CH3)2CHCH2COO- + H3O+

Here the proton of the carboxylic acid is taken by water and water acts as a base. Then the water forms hydronium ion and carboxylic acid forms carboxylate ion.

Therefore, the carboxylate ion formed by the reaction of (CH3)2CHCH2COOH with water is (CH3)2CHCH2COO- ion having IUPAC name 3-methylbutanoate.

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The answer to the question is D. Appearance was of primary importance because of which Mortise-and-tenon joints were used in most 18th century timber framing

Mortise-and-tenon joints were commonly used in 18th century timber framing because they provided a strong and durable joint, but they also allowed for a clean and aesthetically pleasing appearance. While metal fasteners were scarce at the time, it was not the only reason for the use of this joint. The use of mortise-and-tenon joints was also a reflection of the craftsmanship and skill of the builders who wanted to create a lasting and visually appealing structure. Additionally, the tools needed to make mortise-and-tenon joints were readily available and could easily be produced with the primitive tools of the time.

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After washing glass ware with acetone, the acetone should be disposed of properly in a designated hazardous waste container.

Acetone is considered a hazardous waste due to its flammability and potential harm to human health and the environment. Pouring acetone down the drain or into the trash can contaminate the water supply or harm wildlife. It is important to follow the regulations and guidelines set by your local waste management facility when disposing of acetone and other hazardous materials.After washing glass ware with acetone, the acetone should be disposed of properly in a designated hazardous waste container.  Contact your local waste management facility or a licensed hazardous waste disposal company to inquire about proper disposal methods. It is also important to handle acetone with care, as it is a highly flammable substance that should be stored in a cool, dry, and well-ventilated area. Always wear protective gloves, goggles, and a respirator when working with acetone to minimize exposure to its harmful effects.

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Answer:

Chemical energy is defined as. the energy which is stored in the bonds of chemical compounds (molecules and atoms).

Explanation:

Chemical energy may be released during a chemical reaction

Answer:

Chemical energy is the energy stored in the chemical bonds of Compound.

It's used during chemical Reactions.

The molar mass (g/mol) of the unknown solid is 155.36 g/mol.

A sample size of unknown solid acid, m = 0.615 g, The concentration of NaOH, c = 0.1032 m, The mole ratio of the unknown solid to NaOH is 1:1, The volume of NaOH used, V = 38.26 mL

We can calculate the number of moles of NaOH used as follows,

n = c * V / 1000 = 0.1032 * 38.26 / 1000 = 0.00395632 mol

Since the mole ratio of an unknown solid to NaOH is 1:1, we know that the number of moles of an unknown solid is also 0.00395632 mol.

The molar mass of the unknown solid can be calculated as follows,

M = m / n = 0.615 / 0.00395632 = 155.36 g/mol

Therefore, the molar mass of the unknown solid is 155.36 g/mol.

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To express lnA1, lnA2, and lnA3 in terms of lnA0, εA,1, εA,2, and εA,3, we can use the given equations: From the equation At = A + gt + At, we can rewrite it as At - gt = A + At. Taking the natural logarithm (ln) of both sides, we have ln(At - gt) = ln(A + At).

Similarly, from the equation At = rhoAA~t−1 + ϵA,t,−1, we can rewrite it as At - rhoAA~t−1 = ϵA,t,−1. Taking the natural logarithm (ln) of both sides, we have ln(At - rhoAA~t−1) = ln(ϵA,t,−1). Now, let's express lnA1, lnA2, and lnA3 in terms of ln A0, εA,1, εA,2, and εA,3. Expressing lnA1:  

- From equation 1, we have ln(A1 - g1t) = ln(A0 + A1).

Rearranging the equation, we get ln(A1 - g1t) - ln(A1) = ln(A0).
- From equation 2, we have ln(A1 - rhoAA~1−1) = ln(εA,1).

Rearranging the equation, we get ln(A1 - rhoAA~1−1) - ln(A1) = ln(εA,1).

Therefore, lnA1 = ln(A0) + ln(εA,1).

Calculating the expected values of lnA1, lnA2, and lnA3: - Taking the expected value (E) of equation 1, we have E[ln(A1 - g1t)] = E[ln(A0 + A1)]. Since g1t is constant, we can write it as E[ln(A1)] - g1t = ln(A0 + E[A1]).

Rearranging the equation, we get E[ln(A1)] = ln(A0 + E[A1]) + g1t.

- Taking the expected value (E) of equation 2, we have E[ln(A1 - rhoAA~1−1)] = E[ln(εA,1)].  Since rhoAA~1−1 is constant, we can write it as E[ln(A1)] - rhoAE[A~1−1] = ln(εA,1).

Rearranging the equation, we get E[ln(A1)] = ln(εA,1) + rhoAE[A~1−1].

Therefore, the expected value of lnA1 is given by E[lnA1] = ln(A0 + E[A1]) + g1t = ln(εA,1) + rhoAE[A~1−1]. Similarly, we can calculate the expected values of lnA2 and lnA3 using the corresponding equations and constants.
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To calculate the molality of a solution, we need to know the number of moles of solute per kilogram of solvent. Therefore, the molality of the solution is 0.506 mol/kg.

The substance that typically determines the solution's physical state is the solvent (solid, liquid or gas). The substance that dissolves in the solvent is known as a solute. For instance, in a solution of salt and water, salt serves as the solute and water as the solvent.

Here's how we can calculate the molality of the given solution:

Step 1: Calculate the number of moles of cobalt (II) nitrate

The molar mass of cobalt (II) nitrate is 194.99 g/mol. Therefore, the number of moles of cobalt (II) nitrate dissolved in 49.4 grams can be calculated as follows:

moles of Co(NO3)2 = mass ÷ molar mass

moles of Co(NO3)2 = 49.4 g ÷ 194.99 g/mol

moles of Co(NO3)2 = 0.253 moles

Step 2: Calculate the mass of water

The mass of 500 ml of water can be calculated as follows:

mass of water = volume of water × density of water

mass of water = 500 ml × 1 g/ml

mass of water = 500 g

Step 3: Calculate the molality

Now we can calculate the molality of the solution using the following formula:

molality = moles of solute ÷ mass of solvent in kilograms

mass of solvent in kilograms = mass of water ÷ 1000

molality = 0.253 moles ÷ (500 g ÷ 1000)

molality = 0.506 mol/kg

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12 g of carbon gives 44 g of carbon dioxide. Then 6 g of carbon will give 22 g of carbon dioxide. One mole or 44g of carbon  dioxide contains 22.41 L at STP. Hence, 22 g contains 11.2 L.

The standard temperature and pressure is called STP condition. A temperature  of 298 K and pressure of 1 atm is called standard temperature and pressure.

At STP condition, the volume of one mole of any substance is 22.4 liters. One mole corresponds to 6.02 × 10²³ molecules.

One mole of carbon gives one mole of carbon dioxide.

mass of carbon = 12 g /mol

molar mass of carbon dioxide = 44 g/mol

then, 6 g of carbon will give,

6/12× 44 = 22 g of CO₂.

22 g of CO₂ is 0.5 moles. One mole of CO₂ contains 22.4 L at STP. then 0.5 moles of CO₂ contains 11.2 L at STP.

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Answer:

the answer is D

Explanation:

percentage composition=  mole of the substance divided by the total molar mass of the compound multiplied by 100.

From the aquifer, 18 m3 of water may be pumped.

Because the total amount of precipitation, evapotranspiration, and runoff are equal, the water budget of the entire planet is balanced. Local water budgets, also known as water use budgets, are typically unbalanced for a certain area.

The naturally occurring water cycle includes groundwater (check out our interactive water cycle diagram). The precipitation that falls on the ground penetrates the subsoil to some extent. The portion of groundwater recharge that travels deeper into the soil until it reaches saturated rock material is the last to do so.

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Answer:

The primary reason why cars in Mombasa rust faster than those in Nairobi is because the humidity ( water evaporation rate) in Mombasa is higher than that of Nairobi. Since Mombasa has higher temperatures the rate of water evaporation is higher which results into a higer humidity.

Explanation:

This is why cars in Mombasa rust faster than those in Nairobi

It will have no effect because the order in which elements exist mixed will not vary the fact that matter cannot be made nor destroyed. Therefore, the correct answer is option b. The same as the mass of the liquid.

The order in which we add the ingredients does not involve the mass of the jelly because the order in which ingredients exist mixed will not alter the reality that matter cannot be made nor destroyed.

The mass of the jelly remains exact due to the incorporation of the exact quantity of ingredients.

It will have no effect because the order in which elements exist mixed will not vary the fact that matter cannot be made nor destroyed.

Therefore, the correct answer is option b. The same as the mass of the liquid.

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Answer:

Presence of an Electrolyte

Metal Surface

Oxygen or Other Oxidizing Agent

Difference in Potential

Electrochemical Pathway

Explanation:

The molarity (in mole per liter), given that 16.87 mg of LiBr is in 328.1 mL of solution is 0.0004 mole per liter

First, we shall obtain the mole of 16.87 mg of LiBr. This is shown below:

Mole of LiBr = mass / molar mass

= 0.01687 / 86.845

= 0.000194 mole

Finally, we shall determine the molarity. This is shown below:

Molarity = mole / volume

= 0.000194 / 0.3281

= 0.0004 mole per liter

Thus, the molarity is 0.0004 mole per liter

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CaseAnswer:

-Mole of stearic acid used = 1.3*10^-3 mol

-Molecules of stearic acid there would be in 1 mole of stearic acid = 7.994*10^20 molecules

Explanation:

Know information from the problem are:

Mass concentration of C18H32O2 = 1.6x10^-4 g/ml, Molar mass of C18H32O2 = 284 g/mol.

Unit factor from drops to ml is 72 drops = 1ml. Therefore, for every drop, n, given, there would be n drops (1ml/ 72drops). The problem tells that stearic acid was added to hexane and that the addition process was done three-time with different amounts of drops. Think of this as releasing a substance from a burette during titration. If we convert the drops into millimeters, we would have 20 drops (1ml/72drops)= 0.28 ml, 21 drops (1ml/72drops)= 0.29 ml, and 16 drops (1ml/72drops)= 0.22 ml. [We need these volumes to determine the mass of stearic acid from mass concentration given.]

Unknown informations are:

V (volume in ml) =?

The mole of stearic acid used =?

Strategy

To calculate the mole of stearic acid used, we need the mass of stearic acid from the mass concentration. To get this we need a volume. Notice that those volumes (drops) are not the same ( it is safe to say that there is an error in the readings, as they were done independently). Therefore, we would find two or three values whose difference is smaller ( there is a little error). Subtract the smaller number from the larger number till you get a smaller difference ( do this for all three values).

The set of numbers with the smallest difference is 0.29 - 0.28=0.014, our concordant value.

Solutions

Now we us this set of numbers, 0.29-0.28, to determine an average volume :

V = (0.29-0.28)/2 (ml)

V= 0.285 ml

Now we can calculate the mass of stearic acid from the mass concentration:

m = C*V; m is the mass, C is the concentration in g/ ml, and V is the volume in ml.

m = (1.64*10^-4 g/ml)*(0.285 ml)

m = 4.674*10^-5 g

The mole of stearic acid used:

n = m/MM l; n is the mole of stearic acid, m is the mass of stearic acid, and MM is the molar mass of stearic acid.

n = 4.674*10^-5 g (284 g/mol)

n = 1.3274*10^-3

How many molecules of stearic acid would there be if it was 1 mol of stearic acid?

1 mol = 6.02214*10^23 molecule

Therefore, a conversion fraction would be:

6.02214*10^23 molecule/ 1 mol

Solution

Molecules of stearic acid in 1 mol =

1.3274*10^-3 mol (6.02214*10^23 molecule/ 1 mol)

= 7.994*10^20 molecules in 1 mol of C18H16O2

The temperature necessary to increase the volume to 56.1 L if the pressure remains constant is 796.09 K. This is calculated using the expression of Charles's law.

According to the Charles's Law, the relationship between volume and temperature is,

      \(V_{1} / T_{1}\) = \(V_{2} / T_{2}\)

Here V1 is the initial volume and T1 is the absolute temperature and V2 is the final volume and T2 is the final temperature.

We know that at Constant pressure, Volume is directly proportional to the temperature of the gas.

T2 =  V1/ T1  * V2

A gas occupies 21.0 l at 1.00 atm. pressure and 298 k. It is necessary to increase the volume to 56.1 l if the pressure remains constant

here, V1 = 21.0 L

          V2 = 56.1 L

           T1 = 298K

Putting all the value in the expression of Charles's law we get,

T2 = 56.1 x (298/21.0)

    = 796.09K

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Answer:

Nonpolar molecules dissolve in nonpolar solvents through a process called dispersion forces or London forces.

In nonpolar molecules, the electrons are evenly distributed and there is no permanent dipole moment, which means that the molecule has no positive or negative poles. When nonpolar molecules are added to a nonpolar solvent, such as oil or hexane, the molecules are attracted to one another due to London dispersion forces.

London forces are due to temporary fluctuations in electron density within molecules, creating temporary dipoles. These temporary dipoles induce corresponding temporary dipoles in other nearby molecules, attracting them to each other. The strength of the London dispersion forces increases with the size of the molecule, since larger molecules have more electrons and a greater potential for temporary dipoles.

In general, nonpolar molecules bind together in nonpolar solvents through these weak intermolecular forces, allowing them to dissolve and form a homogeneous solution.

Explanation:

Answer:

Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.

Answer: A.

Explanation: When light passes through a small hole, it creates an inverted image on the opposite side. In this case, since the arrow is pointing up, the inverted image will appear pointing down on the opposite wall. Furthermore, since the box has a hole on its left side, the inverted image will be shifted towards the left.

Answer:

Structure of boron trifluoride, an example of a molecule with trigonal planar geometry.

Examples: SO3

Coordination number: 3

Point group: D3h

Bond angle(s): 120°

HOPE ITS HELP

The experimental approach used to analyze the metal content in the precipitate of soap produced by reaction 1 was 0.1 M HCl(aq), then titrated with standard 0.1 M NaOH(aq) using an indicator.

Soap precipitate is a salt of a weak base. The addition of HCl produces free fatty acids, which can then be neutralized with NaOH. The difference between the number of moles of HCl and NaOH required to reach the endpoint gives the number of moles of RCO₂, which can then be used to calculate the mass and percent of the metal in the solid.

Complete questions:

Which experimental approach can be used to analyze the metal content of the soapy precipitate produced by Reaction 1?

M₂+(aq) + 2NaC₁₇H₃₂CO₂(aq) → 2Na+(aq) + M(C₁₇H₃₂CO₂)₂(s)

Dissolve the solid in a known volume of:

The true choice is D

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If equal masses of different compounds undergo complete combustion, the compound that yields the greatest mass of CO2 will be the one that contains the most carbon. This is because CO2 is produced when carbon in a compound reacts with oxygen during combustion.

Here are the masses of CO2 that would be produced by equal masses of each of the compounds you listed if they underwent complete combustion:

Methane (CH4): One molecule of methane contains one atom of carbon and four atoms of hydrogen. When it undergoes complete combustion, it reacts with two molecules of oxygen (O2) to produce one molecule of CO2 and two molecules of water (H2O). Therefore, the mass of CO2 produced by one molecule of methane is 44 g/mol (the molar mass of CO2 is 44 g/mol).

Ethanol (C2H5OH): One molecule of ethanol contains two atoms of carbon, six atoms of hydrogen, and one atom of oxygen. When it undergoes complete combustion, it reacts with three molecules of oxygen to produce two molecules of CO2 and three molecules of water. Therefore, the mass of CO2 produced by one molecule of ethanol is 88 g/mol (the molar mass of CO2 is 44 g/mol).

Octane (C8H18): One molecule of octane contains eight atoms of carbon and 18 atoms of hydrogen. When it undergoes complete combustion, it reacts with 25 molecules of oxygen to produce 16 molecules of CO2 and 18 molecules of water. Therefore, the mass of CO2 produced by one molecule of octane is 704 g/mol (the molar mass of CO2 is 44 g/mol).

Based on these calculations, octane would yield the greatest mass of CO2 when it undergoes complete combustion. Methane and ethanol would yield less CO2, since they contain less carbon.

an explanation of why particular events happen in the natural world

Answer:

C I believe not quite sure tho

In heating and melting curves, the name of the heat associated with the solid-liquid phase is Heat of fusion.

What is the Heat of fusion ?

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Answer:

Partial pressure.

The scientist is most likely measuring the partial pressure of the gases in the atmosphere.

Answer:

Mitochondria -uses glucose!!

Explanation:

Answer:

I think the answer is

2) They have the same number of valence electrons