There are Blank 1 grams in one mole of ZnCl2. Please round atomic masses to the nearest whole number.
Answer ASAP please

Answer: 24.31g/mol

Explanation:

The correct answer is To determine the mass of Mg used in the reaction, we need to know the number of moles of Mg that reacted with the 2.26 moles of HCl. To do this, we can use the mole ratio from the balanced chemical equation:

Mg + 2 HCl → MgCl2 + H2 According to the stoichiometry of this equation, 1 mole of Mg reacts. With 2 moles of HCl to produce 1 mole of MgCl2 and 1 mole of H2. Therefore, to determine the amount of Mg used in the reaction, we need to first calculate the number of moles of HCl that reacted, and then use the mole ratio between Mg and HCl to find the number of moles of Mg. Given that 2.26 moles of HCl were used in the reaction, we can use the mole ratio of the balanced equation to calculate the number of moles of Mg moles of Mg = 1/2 x moles of HCl = 1/2 x 2.26 mol = 1.13 mol Now that we know the number of moles of Mg used, we can calculate the mass of Mg using its molar mass: mass of Mg = moles of Mg x molar mass of Mg = 1.13 mol x 24.31 g/mol = 27.5 g Therefore, the mass of Mg used in the reaction was 27.5 grams.

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Photochemical oxidants are examples of secondary pollutants.

Photochemical oxidants are secondary pollutants as they are formed in the atmosphere due to the combination of primary pollutants, such as nitrogen oxides and volatile organic compounds, with sunlight. These oxidants can cause smog, respiratory problems, and other environmental issues.

The other options mentioned in the question are: Aerosols, volatile organic compounds, combustion gases, and dust from soil erosion are examples of primary pollutants.Aerosols are solid or liquid particles that are suspended in the air. They can come from natural sources like dust or volcanic ash, or human-made sources like industrial emissions.

Volatile organic compounds (VOCs) are organic chemicals that easily evaporate into the air. They are emitted by many sources such as motor vehicles, industrial processes, and household products.Combustion gases are produced by the burning of fossil fuels or biomass. They can contribute to smog and other environmental problems.Dust from soil erosion is also a primary pollutant, which can cause respiratory problems and contribute to air pollution.

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For the compound Ba(OH)2, the formulas of all the species that you can expect to be present in aqueous solution are:Ba2+ and 2OH-Ba2+ represents the cationic part of the compound, while 2OH- represents the anionic part of the compound.

In an aqueous solution of Ba(OH)2, the ions would dissolve and exist as free ions. The Ba2+ ion would carry a +2 charge, while the OH- ions would each carry a -1 charge. The balanced chemical equation for the compound dissociation in water is:Ba(OH)2 + 2H2O → Ba2+ + 2OH- + 2H2O

Thus, the formulas of all the species that you can expect to be present in an aqueous solution of Ba(OH)2 are Ba2+ and 2OH-.

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The pH of the solution is 11.13.

First, let's write the balanced chemical equation for the reaction:

NH₂NH₂ + H₂O ↔ NH₂NH₃⁺ + OH⁻

The Kb expression for this reaction is,

Kb = [NH₂NH₃⁺][OH⁻] / [NH₂NH₂]

Since we're given the concentration of NH₂NH₂ and NH₂NH₃⁺, we can use the Kb expression to find [OH⁻]:

Kb = [NH₂NH₃⁺][OH⁻] / [NH₂NH₂]

1.7 × 10^-6 = (0.387-x)x / (0.258+x)

where x is the concentration of  ion in mol/L.

Solving for x, we get:

x = 7.43 × 10^-4 M

Therefore, the concentration of OH⁻ ion in the solution is 7.43 × 10^-4 M. To find the pH of the solution, we can use the equation:

pH = 14 - pOH = 14 - (-log[OH⁻]) = 11.13.

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Answer:

CH3-0-

Explanation:

An anion is always a better nucleophile than a neutral molecule.

Nucleophilicity is parallel to basicity. Acidity: HI > HCN > H₂O > EtOH. So, among the options provided, the best nucleophile is A) [tex]EtO}^-[/tex].

A chemical species known as a nucleophile is one that tends to give an electron pair to an electrophile during a chemical reaction, often an atom or an ion. The word "nucleophile," which refers to someone who is drawn to positively charged regions in a chemical reaction, is derived from the Latin terms "nucleus," which means "nucleus or core," and "philein," which means to love.

Many chemical processes, including addition, elimination, and nucleophilic substitution reactions, depend heavily on nucleophiles. In these reactions, molecules that are electron-deficient and have a propensity to attract electrons—known as electrophiles—are attacked by nucleophiles.

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From the following options, which would you expect to be the best nucleophile?

A) [tex]EtO}^-[/tex]

B) [tex]{OH}^-[/tex]

C) [tex]{CN}^-[/tex]

D) [tex]{I}^-[/tex]

Solubility of [tex]CaF$_2$[/tex] at 25°C with Ksp of 4.0 x [tex]10$^{-11}$[/tex] is approximately 6.34 x [tex]10$^{-4}$[/tex] mol/L.

The dissolvability of a substance is characterized as the most extreme measure of the substance that can break up in a given dissolvable at a specific temperature and strain. The dissolvability of calcium fluoride [tex](CaF$_2$)[/tex] at 25°C can be determined utilizing its Ksp esteem, which is 4.0 x [tex]10$^{-11}$[/tex].The Ksp articulation for [tex]CaF$_2$[/tex] is:

Ksp = [tex][Ca$^{2+}$][F$^{-}$]$^2$[/tex]

Let the dissolvability of [tex]CaF$_2$[/tex] be addressed by the variable x, so the convergences of [tex]Ca$^{2+}$[/tex] and [tex]F$^{-}$[/tex] in arrangement will be equivalent to x.Subbing these qualities into the Ksp articulation gives:

Ksp = [tex]x$\times$x$^2$ = x$^3$[/tex]

Reworking the condition gives:

x = [tex](Ksp)$^{1/3}$[/tex]

Subbing the worth of Ksp = 4.0 x [tex]10$^{-11}$[/tex] into the above condition gives:x = [tex](4.0 x 10$^{-11}$)$^{1/3}$ = 6.34 x 10$^{-4}$[/tex] mol/L

In this manner, the dissolvability of calcium fluoride at 25°C is around 6.34 x [tex]10$^{-4}$[/tex] mol/L, adjusted to two decimal spots for comfort. This really intends that at harmony, 6.34 x [tex]10$^{-4}$[/tex] moles of calcium fluoride can break up in one liter of water at 25°C.

On the off chance that how much [tex]CaF$_2$[/tex] in arrangement is higher than this worth, it will encourage out of the arrangement, and assuming it is lower, more [tex]CaF$_2$[/tex] will break down until the balance focus is reached.

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The classification of an acid or base as weak or strong is primarily determined by the extent of dissociation in water.

The characterization of a corrosive or a base as frail or solid not entirely set in stone by the degree of separation of the broke down corrosive or base, which is otherwise called the ionization steady. A solid corrosive or base totally separates in water, creating a high centralization of hydrogen or hydroxide particles, separately.

Conversely, a powerless corrosive or base just to some extent separates, bringing about a lower centralization of particles. The solvency of the corrosive or base and its fixation likewise assume a part in deciding its solidarity, however they are not the essential variables. The grouping of a corrosive or base is connected with its solidarity, yet not by any means the only element decides its solidarity.

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Phenyl bromide is the limiting reagent in the Grignard reaction, as it produces the smallest number of moles of the Grignard reagent compared to magnesium and carbon dioxide.

The balanced equation for the Grignard reaction between phenyl bromide and carbon dioxide is:

C₆H₅Br + Mg + CO₂ → C₆H₅COOMgBr

To determine the limiting reagent in the reaction, we need to calculate the number of moles of each reactant and compare them to the stoichiometric coefficients in the balanced equation. The limiting reagent is the reactant that is completely consumed in the reaction and limits the amount of product that can be formed.

The molar mass of phenyl bromide is 157.01 g/mol, and the mass used is 1.4555 g, so the number of moles of phenyl bromide is:

1.4555 g / 157.01 g/mol = 0.009271 mol

The molar mass of magnesium is 24.31 g/mol, and the mass used is 0.5734 g, so the number of moles of magnesium is:

0.5734 g / 24.31 g/mol = 0.0236 mol

The molar mass of carbon dioxide is 44.01 g/mol, and the mass used is 10.0 g, so the number of moles of carbon dioxide is:

10.0 g / 44.01 g/mol = 0.227 mol

Finally, the molarity of the HCl solution is 6.0 mol/L, and the volume used is 30.2 mL, or 0.0302 L, so the number of moles of HCl is:

6.0 mol/L x 0.0302 L = 0.1812 mol

According to the balanced equation, one mole of phenyl bromide reacts with one mole of magnesium and one mole of carbon dioxide to produce one mole of the Grignard reagent. Therefore, the limiting reagent is the reactant that produces the smallest number of moles of the Grignard reagent.

Using the above calculations, we find that the number of moles of the Grignard reagent that can be formed from each reactant is:

Since the smallest number of moles is produced from phenyl bromide, it is the limiting reagent in the reaction.

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Answer:

A daughter element is the element formed when a radioactive element undergoes radioactive decay

Explanation:

may I get brainliest thanks

Answer:

A

Explanation:

I believe it's A sorry if any part of my answer is wrong i tried my best to help you improve

According to the Beer lamberts law the absorbance is directly proportional to the concentration of the sample.

Beer-lambert Law states that when the extinction coefficient and the path length are constant, the absorbance is proportional to the concentration of the sample. According to this law the absorbance is directly proportional to the length of the light path.  It is equals to the inner width of the cuvette. It  is evident that the path length affects absorbance. We know that with a longer optical path length, the light has to travel through more solution and can hit more molecules or atoms and be absorbed more of the solution. The absorbance is directly proportional to the concentration of the given sample.

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The  complete question is,

Does stopper affect absorbance?

The main causes of the Grevy's zebra population decrease are habitat degradation, competition for resources with domestic livestock, and hunting for their skins and meat.

The main factor contributing to the decrease of Grevy's zebras in Ethiopia is hunting. Although their striking skins are the main reason they are hunted, they are also rarely slain for food and, in some areas, for medicinal purposes.

Zebras from Grevy's are in peril. Grevy's zebras have experienced one of the greatest range reductions of any African animal, and are now restricted to northern Kenya and southern and eastern Ethiopia. They are no longer residing in Somalia, Eritrea, Djibouti, and it's possible that they've left Sudan as well.

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In general, the concentrations of each species at equilibrium will depend on the stoichiometry of the reaction, the equilibrium constant (K), and the initial concentrations of the reactants and products.

At equilibrium, the forward and reverse reaction rates are equal, and the concentrations of the reactants and products no longer change with time. The concentrations of each species at equilibrium will depend on the initial concentrations and the equilibrium constant. If the equilibrium constant is large, then the reaction will favor the products at equilibrium. If the equilibrium constant is small, then the reaction will favor the reactants at equilibrium.

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Theoretical yield of iron (III) oxide is 4.92 g ; percent yield for this reaction is approximately 73.3%.

Quantity of a product obtained from reaction is expressed in terms of yield of the reaction. Amount of product predicted by stoichiometry is called theoretical yield and whereas amount obtained actually is called  actual yield.

Balanced chemical equation for the reaction is: 4Fe + 3O₂→ 2Fe₂O₃

Molar mass of Fe = 55.85 g/mol

So, Number of moles of Fe = mass/molar mass = 3.44 g/55.85 g/mol = 0.0615 mol

and Number of moles of Fe₂O₃ = 0.0615 mol Fe × (2 mol Fe₂O₃/4 mol Fe) = 0.0308 mol Fe₂O₃

Molar mass of Fe2O3 = 159.69 g/mol

Theoretical yield of Fe₂O₃ = number of moles × molar mass = 0.0308 mol × 159.69 g/mol = 4.92 g

Therefore, theoretical yield of iron (III) oxide is 4.92 g.

As percent yield = (actual yield / theoretical yield) x 100%

So, percent yield = (4.32 g / 5.89 g) x 100% ≈ 73.3%

Therefore,  percent yield for this reaction is approximately 73.3%.

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Once you have the correct values for pressure, volume, and temperature, follow these following steps to calculate the mass and number of moles of dinitrogen monoxide gas collected.

To calculate the mass and number of moles of dinitrogen monoxide gas collected, we will use the ideal gas law equation:
PV = nRT
where:
P = pressure in the flask
V = measured volume of the flask
n = number of moles of gas
R = ideal gas constant (0.0821 L atm / K mol)
T =temperature in Kelvin
However, the student question did not provide values for the pressure, volume, or temperature. Assuming that you have these values, you can proceed as follows:
1. Convert the given temperature to Kelvin if it's in Celsius (K = °C + 273.15).
2. Plug in the given values for P, V, and T into the ideal gas law equation
3. Solve for n (number of moles):
n = PV / RT
4. Calculate the mass of dinitrogen monoxide (N₂O) gas using the molar mass (44.013 g/mol):
mass = n × molar mass
5. Round your answers to the appropriate significant digits.

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Charles's Law-

[tex]\:\:\:\:\:\: \:\:\:\:\:\:\star\longrightarrow\sf \underline{\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}}\\[/tex]

Where:-

As per question, we are given that -

We are given the initial temperature and the final temperature in °C.So, we first have to convert those temperatures in Celsius to kelvin by adding 273-

[tex]\:\:\:\:\:\:\star\sf T_1[/tex] = 50+ 273 = 323K

[tex]\:\:\:\:\:\:\star\sf T_2[/tex] =150+273 = 423K

Now that we have obtained all the required values, so we can put them into the formula and solve for V₁:-

[tex]\:\:\:\:\:\: \:\:\:\:\:\:\star\longrightarrow\sf \underline{\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}}\\[/tex]

[tex] \:\:\:\:\:\:\:\:\:\:\:\:\longrightarrow \sf V_1 = \dfrac{V_2}{T_2}\times T_1\\[/tex]

[tex] \:\:\:\:\:\:\:\:\:\:\:\:\longrightarrow \sf V_1 = \dfrac{175}{423}\times 323\\[/tex]

[tex] \:\:\:\:\:\:\:\:\:\:\:\:\longrightarrow \sf V_1 = 0.41371......\times 323\\[/tex]

[tex]\:\:\:\:\:\: \:\:\:\:\:\:\longrightarrow \sf V_1 = 133.628........\\[/tex]

[tex] \:\:\:\:\:\:\:\:\:\:\:\:\longrightarrow \sf\underline{ V_1 = 133.63 mL}\\[/tex]

Therefore, the original volume ( Initial volume) of neon is 133.63mL.

If the calibration is to 2 ml, calibration lines are marked on the cylinder every 2 ml. Therefore, we can calculate the liquid volume in the cylinder to the nearest 2 ml.

Calibration in chemistry is the process of ensuring that any scientific method or instrument produces accurate results. If the calibration is 2 ml, then there are calibration lines on the cylinder spaced 2 ml apart.

Formally, calibration is the process of comparing a measurement device that needs to be calibrated to a device or reference standard that can be tracked. The term "calibrator" may also be used to describe the reference standard. According to logic, the calibration of the instrument should be more precise than the reference standard.

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The equilibrium partial pressure of CH4(g) is 0.417 atm.

For the following reaction, Kp = 0.262 at 1000°C: C(s) + 2H2(g) ⇌ CH4(g) At equilibrium, the partial pressure of H2 is 1.26 atm.

The equilibrium constant (Kp) is defined as the ratio of the partial pressures of products to the partial pressures of reactants with each concentration term raised to a power equivalent to its coefficient in the balanced chemical equation.

At equilibrium, the partial pressure of H2 is 1.26 atm. CH4 partial pressure can be calculated by applying the equilibrium constant to this value. Here are the steps for calculating the equilibrium partial pressure of CH4(g): Write the equilibrium equation and the corresponding Kp expression.

Calculate the value of Kp.Substitute the known partial pressure of H2 into the equilibrium expression and solve for the unknown equilibrium partial pressure of CH4(g).At equilibrium, C(s) + 2H2(g) ⇌ CH4(g)The Kp expression is: Kp = PCH4/PH2²Kp = 0.262PCH4 = (Kp)(PH2²)PCH4 = (0.262)(1.26²)PCH4 = 0.417 atm

Therefore, the equilibrium partial pressure of CH4(g) is 0.417 atm.

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Answer:

  12.5 g/cm³

Explanation:

You want the density of a rock that has a mass of 125 g and displaces 10 mL of water in a graduated cylinder.

The balance shows a mass that is the sum of the readings on the different beams:

  20 +100 + 5 = 125

We presume the balance is measuring grams.

The graduated cylinder shows an increase in volume from 20 mL to 30 mL when the rock is added to the water. This means the rock has a displacement of ...

  30 mL -20 mL = 10 mL = 10 cm³

The density is found using the given formula:

  density = mass/volume

  density = (125 g)/(10 cm³) = 12.5 g/cm³

The density of the rock is 12.5 g/cm³.

Withdrawing heat from a solution of two gases will lower the temperature, affecting the probability of a successful reaction on a per-collision basis.

When temperature decreases, the average kinetic energy of the gas molecules also decreases. Consequently, the molecules move slower, resulting in fewer collisions between them. This reduces the chances of successful reactions occurring during each collision.

Moreover, a lower temperature means that the energy barrier for a reaction, known as activation energy, becomes relatively higher compared to the average kinetic energy of the molecules. Activation energy is the minimum amount of energy required for a reaction to occur.

The reaction rate, which is the speed at which a reaction proceeds, is influenced by temperature. The Arrhenius equation, which quantifies the relationship between temperature and reaction rate, shows that a decrease in temperature results in a slower reaction rate.

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If you want to distinguish between the contents of two unlabeled cups, one containing Powerade White Cherry and the other containing Canada Dry Club Soda, you can use a pH indicator.

To impress your roommates with your chemistry skills, you need to select an indicator that can differentiate between the two based on their pH values. Powerade White Cherry has a pH of 2.8 while Canada Dry Club Soda has a pH of 5.2.

Looking at the table of pH indicators, there are two options that cover the pH range of both substances: Bromothymol blue and Phenolphthalein. However, Bromothymol blue has a pH range of 6.0-7.6, which is not low enough to detect the acidity of Powerade White Cherry.

Hence, choose Phenolphthalein, which has a pH range of 8.2-10.0, encompassing both 2.8 and 5.2. By using Phenolphthalein as an indicator, you can impress your roommates with your chemistry knowledge and successfully distinguish between the two cups.

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the wavelength of this gamma ray is approximately 3.50 x [tex]10^-12[/tex] meters, which is in the range of typical gamma ray wavelengths.

The relationship between the frequency (f) and the wavelength (λ) of a wave is given by the formula:

c = fλ

where c is the speed of light in vacuum, which is approximately 3.00 x [tex]10^8[/tex] m/s.

To find the wavelength of a gamma ray with a frequency of [tex]8.56 x 10^19[/tex]Hz, we can use this formula and solve for λ:

c = fλ

λ = c / f

Substituting the given values:

λ = (3.00 x [tex]10^8[/tex] m/s) / (8.56 x  Hz)

λ ≈ 3.50 x[tex]10^-12\\[/tex] m

Frequency is a measure of how many cycles or waves of a periodic signal occur per unit of time. It is usually measured in Hertz (Hz), which represents one cycle per second. For example, a sound wave with a frequency of 440 Hz corresponds to the musical note A above middle C.

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According to the BOD values given, the rate constant (k) is approximately 0.0291 per day at 20°C.

BOD or biochemical oxygen demand is the amount of dissolved oxygen absorbed by aerobic bacteria growing on the organic material present in a water sample at a certain temperature during a specific period measured analytically.

To calculate the rate constant (k), we can use the following formula:

k = ln(BOD1/BOD2)/t

Where,

BOD1 = Initial BOD concentration

BOD2 = BOD concentration after time t

t = time elapsed in days

Given that,

BOD concentration at the end of 7 days (BOD2) = 60.0 ml/l

Ultimate BOD concentration (BOD1) = 85.0 ml/l.

The time elapsed (t) = 7 days.

Therefore,

k = (ln(85.0/60.0))/7

k = 0.0291 per day

Thus, the rate constant (k) is approximately 0.0291 per day at 20°C.

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Answer:

The molar mass of ammonium sulfate ((NH4)2SO4) is:

2 x (14.01 g/mol) (for the nitrogen atoms in the ammonium ions)

8 x (1.01 g/mol) (for the hydrogen atoms in the ammonium ions)

1 x (32.06 g/mol) (for the sulfur atom)

4 x (16.00 g/mol) (for the oxygen atoms in the sulfate ion)

= 132.14 g/mol

To convert the mass of 4392.3 g of ammonium sulfate to moles, we need to divide this mass by the molar mass:

moles = 4392.3 g / 132.14 g/mol

moles = 33.20 mol (rounded to two decimal places)

Therefore, there are 33.20 moles in 4392.3 g of ammonium sulfate.

33.20 mol are in 4392.3 g of ammonium sulfate. The mole designates  6.022×10²³  units, which is a very large number.

In chemistry, a mole, usually spelt mol, is a common scientific measurement unit for significant amounts of very small objects like atoms, molecules, or even other predetermined particles. The mole designates 6.022×10²³ units, which is a very large number. Under the International Units of Measure (SI), the mole is defined as this number as of May 20, 2019, according the General Meeting on Weights as well as Measurements.

The amount of atoms discovered through experimentation to be present in 12 grammes of carbon-12 was originally used to define the mole. In honour of a Italian scientist Amedeo Avogadro, the amount of cells inside a mole is also known as Avogadro's number or Avogadro's constant (1776–1856).

The molar mass of ammonium sulfate=2 x (14.01 g/mol)+8 x (1.01 g/mol)+1 x (32.06 g/mol)+4 x (16.00 g/mol) = 132.14 g/mol

moles = 4392.3 g / 132.14 g/mol

moles = 33.20 mol

Therefore, 33.20 mol are in 4392.3 g of ammonium sulfate. The mole designates  6.022×10²³  units, which is a very large number.

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The average rate of reaction for the given time interval of 0 s to 205 s is calculated out to be -0.00088 M/s.

To calculate the average rate of reaction for each successive time interval, we need to use the formula:

Average rate of reaction = (Change in concentration) / (Change in time)

For the time interval from 0 s to 50 s, the change in concentration is (0.42 M - 0.50 M) = -0.08 M, and the change in time is (50 s - 0 s) = 50 s. Therefore, the average rate of reaction is:

Average rate of reaction = (-0.08 M) / (50 s) = -0.0016 M/s

Similarly, we can calculate the average rate of reaction for each successive time interval as follows:

----------------------------------------------------------------------------------------------------------

Time interval  Change in concentration Change in time Average    

                                                                                                 rate of reaction

----------------------------------------------------------------------------------------------------------

0 s to 50 s        -0.08 M                        50 s                  -0.0016 M/s

50 s to 100 s        -0.06 M                        50 s              -0.0012 M/s

100 s to 150 s               -0.05 M                       50 s                    -0.0010 M/s

150 s to 200 s       -0.05 M                       50 s                   -0.0010 M/s

200 s to 250 s       -0.04 M                       50 s                   -0.0008 M/s

----------------------------------------------------------------------------------------------------------

To find the average rate of reaction for the time interval from 0 s to 205 s, we need to add up the changes in concentration and divide by the total change in time:

Average rate of reaction = (-0.08 M - 0.06 M - 0.05 M - 0.05 M - 0.04 M) / (205 s - 0 s) = -0.00088 M/s

Therefore, the average rate of reaction for the time interval from 0 s to 205 s is -0.00088 M/s.

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The complete question is :

The following table shows the concentration of a reactant at various times during a chemical reaction. Calculate the average rate of reaction for each successive time interval. What is the average rate of reaction for the time interval from 0 s to 205 s?

Time (s)         Concentration (M)

0                     0.50

50                     0.42

100                     0.36

150                     0.31

200                     0.26

250                     0.22

There are 1.69 x 10²² molecules of NaClO4 in 4.446 g of NaClO4.

Avogadro's number (6.022 x 10²³) is the basis of calculations that convert grams to atoms or molecules.

The molar mass of NaClO4 is 22.99 + 35.45 + 4(16.00) = 146.99 g/mol, which is found by adding the atomic masses of each component. This is then converted to moles by dividing the mass of the sample by the molar mass.

The number of molecules can be found by multiplying the number of moles by Avogadro's number, which gives the number of molecules. The following is the calculation:

mass of NaClO4 = 4.446 g
molar mass of NaClO4 = 146.99 g/mol

moles of NaClO4 = mass / molar mass = 4.446 g / 146.99 g/mol = 0.03022 mol

Number of molecules = Avogadro's number × moles = (6.022 x 10²³) x 0.03022 = 1.69 x 10²² molecules

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Answer:

where is the photo

Explanation:

where is it???

The white solid formed was likely a different compound due to the use of incorrect reagents and conditions during the reaction.

When an ester is hydrolyzed with HCl, the reaction typically proceeds via an acid-catalyzed mechanism, in which the ester is protonated to form a tetrahedral intermediate that quickly breaks down into a carboxylic acid and an alcohol. On the other hand, when an ester is hydrolyzed with NaOH, the reaction proceeds via a base-catalyzed mechanism, in which the ester is deprotonated to form a negatively charged intermediate that quickly breaks down into a carboxylate ion and an alcohol.

In this case, the student hydrolyzed the intermediate ester with 6 M HCl instead of 3 M NaOH. This likely led to the protonation of the intermediate and the formation of a carboxylic acid and an alcohol. The student then boiled the reaction mixture with 50% NaOH instead of 6 M HCl. This would have led to the deprotonation of the carboxylic acid and the formation of a carboxylate ion and an alcohol. However, since the NaOH concentration was much higher than what was needed for the reaction, it's possible that the reaction was not selective and other side reactions occurred as well.

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The initial concentration of 'A' was approximately 1.371 M.

To determine the initial concentration of 'A' given the reaction rate constant, time, and the remaining amount of 'A', you can use the integrated rate law equation for a first-order reaction:

[A]t = [A]₀ * e^(-kt)

where:
[A]t = concentration of 'A' at time t (0.048 M)
[A]₀ = initial concentration of 'A'
k = reaction rate constant (0.012 M⁻¹ s⁻¹)
t = time in seconds (27 minutes = 27 * 60 = 1620 seconds)

Now, let's solve for [A]₀:

0.048 M = [A]₀ * e^(-0.012 M⁻¹ s⁻¹ * 1620 s)

To find [A]₀, divide both sides by e^(-0.012 * 1620):

[A]₀ = 0.048 M / e^(-0.012 * 1620)

Now, calculate the value:

[A]₀ ≈ 0.048 M / e^(-19.44)

[A]₀ ≈ 0.048 M / 0.000035

[A]₀ ≈ 1.371 M

So, the initial concentration of A was approximately 1.371 M.

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