what is the ph of the solution that results from adding 30.0 ml of 0.100 m naoh to 45.0 ml of 0.100m acetic acid

Answer:

3. The mass of ethanol required is approximately 0.522869 g

The mass of ethanoic acid required is approximately 0.68156 g

4. The mass of iron (III) oxide required is approximately 285.952.189.095 tonnes

5. The mass of silver nitrate required is approximately 14.53 grams

6. The mass of copper oxide that would be needed is approximately 31.86 grams

7. a. The mass of the precipitate, Zn(OH)₂ formed is approximately 49.712 grams

b. The mass of the precipitate, Al(OH)₃ formed is approximately 13 grams

c. The mass of the precipitate, Mg(OH)₂, formed is approximately 14.579925 grams

Explanation:

3. The 1 mole of ethanol and 1 mole of ethanoic acid combines to form 1 mole of ethyl ethanoate

The number of moles of ethyl ethanoate in 1 gram of ethyl ethanoate, n = 1 g/(88.11 g/mol) = 1/88.11 moles

∴ The number of moles of ethanol = 1/88.11 moles

The number of moles of ethanoic acid = 1/88.11 moles

The mass of ethanol = (46.07 g/mol) × 1/88.11 moles = 0.522869 g

The mass of ethanoic acid in the reaction = 60.052 g/mol × 1/88.11 moles ≈ 0.68156 g

4. 1 mole of iron(III) oxide reacts with 1 mole of CO₂ to produce 1 mole of iron

The number of moles in 100 tonnes of iron= 100000000/55.845 = 1790670.60614 moles

The mass of iron (III) oxide required = 159.69 × 1790670.60614 = 285952189.095 g ≈ 285.952.189.095 tonnes

5. The number of moles of NaCl in 5 grams of NaCl = 5 g/58.44 g/mol = 0.0855578371 moles

The mass of silver nitrate required, m = 169.87 g/mol × 0.0855578371 moles ≈ 14.53 grams

6. The number of moles of CuSO₄·5H₂O in 100 g of CuSO₄·5H₂O = 100 g/(249.69 g/mol) ≈ 0.4005 moles

The mass of copper oxide required, m = 79.545 g/mol × 0.4005 moles ≈ 31.86 grams

7. a. The number of moles of NaOH in the reaction = 20 g/(39.997 g/mol) ≈ 0.5 moles

2 moles of NaOH produces 1 mole of Zn(OH)₂

0.5 moles of NaOH will produce 0.5 mole of Zn(OH)₂

The mass of 0.5 mole of Zn(OH)₂ = 0.5 mole × 99.424 g/mol = 49.712 grams

The mass of the precipitate, Zn(OH)₂ formed = 49.712 grams

b. 6 moles of NaOH produces 2 moles Al(OH)₃

20 g, or 0.5 mole of NaOH will produce (1/6) mole of Al(OH)₃

The mass of the precipitate, Al(OH)₃ formed, m = 78 g/mol×(1/6) moles = 13 grams

c. 2 moles of NaOH produces 1 mole of Mg(OH)₂, therefore;

20 g or 0.5 moles of NaOH formed (1/4) mole of Mg(OH)₂

The mass of the precipitate, Mg(OH)₂, formed, m = 58.3197 g/mol × (1/4) moles = 14.579925 grams

Answer:

Explanation:

i will show in details how 2 do the 1st Q n u can do the rest by following the way how it is done

3. given C^2H^5OH + CH^3CO^2H → CH^3CO^2C^2H^5 + H^2O

molar ratio of ethanol, ethanoic acid and ethyl ethanoate is 1 : 1 : 1

so mass = no. of moles * molecular mass

for same no. of moles, mass / molecular mass is the same

molecular mass of CH^3CO^2C^2H^5 = 12+1*3+12+16*2+12*2+5*1 = 88

molecular mass of C^2H^5OH = 12*2+1*5+16+1 = 46

molecular mass of CH^3CO^2H = 12+1*3+12+16*2+1 = 60

1 g of ethyl ethanoate = 1/88 mole

it requires 1/88*46 = 0.5227 g of ethanol; and

1/88*60 = 0.6818 g of ethanoic acid

to react together to form 1 g of ethyl ethanoate

We expect the release of PCO2 from the bottle, When the cork is pulled.

When the cork is pulled, we expect the release of PCO2 in the atmosphere to happen because there is high concentration of PCO2 in the bottle but there is no concentration of PCO2 in the atmosphere so due to diffusion, the PCO2 gas moves outside the bottle.

So we can conclude that When the cork is pulled, the release of PCO2 from the bottle will be expected.

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The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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The complete sentences are:

Page 3:

The effect of energy in phase transitions of matter is that it is required to break the intermolecular forces that hold the particles of a substance together. When energy is added to a substance, the particles move faster and the intermolecular forces are broken. This can cause the substance to change phase.

The interactive demonstration on the sample of water shows that energy is required to melt ice and boil water. When the ice is heated, the particles start to move faster and the ice melts. The temperature of the water stays constant at 0°C until all of the ice has melted. This is because the energy is being used to break the intermolecular forces in the ice. Once all of the ice has melted, the temperature of the water starts to rise again. When the water is boiled, the particles move so fast that they escape from the liquid state and become a gas. The temperature of the water stays constant at 100°C until all of the water has boiled. This is because the energy is being used to break the intermolecular forces in the water. Once all of the water has boiled, the temperature of the steam starts to rise again.

The complete sentences:

Page 4:

Heating curves show the temperature of a substance as it is heated. The curve has a horizontal line at the melting and boiling points, which indicates that the temperature does not change during these phase changes.

Cooling curves show the temperature of a substance as it is cooled. The curve has a horizontal line at the melting and boiling points, which indicates that the temperature does not change during these phase changes.

Both curves show that the temperature of a substance increases as it is heated and decreases as it is cooled.

A heating curve is more choppy than a cooling curve because there are more phase changes during heating than during cooling.

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Answer:

Rewrite the following sentence in reported speech

The chair person said,"A hearty welcome to all present!"

Answer:

13

Explanation:

Answer:

it is 13

Explanation:

The correct options are: A. The charge of a conjugate base might be positive, neutral, or negative. C. One more H exists in the conjugate acid than its corresponding base.

Option B is incorrect because the charge of the conjugate acid of a neutral base depends on the strength of the acid that accepts the proton. To explain further, a conjugate acid is the species formed when a base gains a proton, while a conjugate base is the species formed when an acid donates a proton. The conjugate acid has one more hydrogen ion (H+) than its conjugate base, and this is because it has gained a proton. The conjugate base can have a positive, neutral, or negative charge, depending on the nature of the acid that donated the proton. Therefore, options A and C are correct, while option B is incorrect.

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Answer:

biosphere

You can even double check on g00gle.

Explanation:

Since [H+] [OH-] =10^(-14)

[H+] = (10^-14) / (1.4×10^-10)

Understanding physical properties of matter is essential in everyday life for a variety of purposes, from cooking to choosing materials.

Knowledge of physical properties of matter is extremely important in everyday life as it helps us understand the nature of substances we come into contact with. One example is the use of boiling points in cooking. Different substances have different boiling points which determine the temperature at which they boil. This information is crucial in determining cooking times and ensuring that food is cooked properly.

For instance, water boils at 100 degrees Celsius, while sugar syrup boils at a much higher temperature. If the wrong temperature is used, food may be undercooked or overcooked, leading to undesired outcomes. Knowledge of physical properties also helps in choosing the right materials for different purposes, such as choosing heat-resistant materials for cooking.

In conclusion, understanding physical properties of matter is essential in everyday life for a variety of purposes, from cooking to choosing materials.

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Answer:

The Bohr model shows the atom as a central nucleus containing protons and neutrons with the electrons in circular orbitals at specific distances from the nucleus (Figure 1). These orbits form electron shells or energy levels, which are a way of visualizing the number of electrons in the various shells

The average atomic mass of chromium is therefore 52.057, which is closest to option C.

The average atomic mass of chromium can be calculated using the formula:

(% abundance of isotope 1/100 x mass of isotope 1) + (% abundance of isotope 2/100 x mass of isotope 2) + .....

Using this formula and the data provided, we get:

          (4.3/100 x 50) + (83.8/100 x 52) + (9.5/100 x 53) + (2.4/100 x 54)

                                           = 2.15 + 43.576 + 5.035 + 1.296

                                          = 52.057

The average atomic mass of chromium is therefore 52.057, which is closest to option C.

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Answer:

highly unstable

Explanation:

also, due to repulsion of lone pairs and instability it breaks and can't form PI5

hope that helps....

Let's see that the STP represents the conditions for the temperature of 0°C (273 K) and for the pressure of 1 atm.

We have this initial data and a volume of 3.20 x 10 ^(2) mL. To solve this problem, we need to use the ideal gas formula:

where T is temperature, P is pressure, and V volume. Subindex 1 is the initial data and subindex 2 is the final data.

We want to find the final volume, so clearing for V2 in the formula, we're going to obtain:

And the final step is replacing the data that we have, where the final data is 425.0 K and 3.50 atm (remember that the volume must be in liters, 1 liter is 1000 mL, so 3.20 x 10^2 mL is 0.32 L):

The answer is that the new volume of the sample of helium would be 0.14 L.

Answer:

D. neon.

Explanation:

Hello there!

In this case, according to the following bonding:

\(H-F\)

It is possible to bear to mind the fact that hydrogen has one valence electron whereas fluorine has seven. Moreover, once they bond, we understand fluorine takes the only hydrogen's valence electron to attain the electron configuration of the former's contiguous noble gas which is D. neon.

Best regards!

An endothermic reaction is one that absorbs heat from its surroundings, resulting in an increase in the system's internal energy.

Therefore, the enthalpy change associated with an endothermic reaction is positive. The energy required to break the bonds in the reactants is greater than the energy released when new bonds are formed in the products, resulting in a net absorption of energy.

The enthalpy change is a measure of the heat energy released or absorbed during a chemical reaction, and it is often used to determine whether a reaction is exothermic or endothermic.

In the case of an endothermic reaction, the products have more internal energy than the reactants, and the enthalpy change is positive.

Some examples of endothermic reactions include melting ice, evaporating water, and photosynthesis. In all of these reactions, heat is absorbed from the surroundings, resulting in a positive enthalpy change.

Understanding the enthalpy change associated with a reaction is important in fields such as thermodynamics, chemical engineering, and materials science.

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The reaction that is exothermic is as follows: None of the reactions are exothermic (option D).

Exothermic reaction is a kind of reaction that releases energy in the form of heat or that releases heat during its formation, and absorbs it during its decomposition.

An exothermic process releases heat, causing the temperature of the immediate surroundings to rise.

According to this question, the chemical equation that exemplifies exothermic reaction is as follows:

Therefore, none of the options above are exothermic.

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Reaction B is exothermic according to the thermochemical equation provided. Option B is he correct answer.

When energy is transferred to the surroundings, this is called an exothermic reaction, and the temperature of the surroundings increases. Examples of exothermic reactions include: combustion reactions. many oxidation reactions.

According to the thermochemical equation provided, the reaction B is exothermic. In this reaction, the mercury oxide (HgO) reacts with heat to produce mercury (Hg) and oxygen (O₂) gas. The overall reaction gives out heat, making it exothermic.

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Answer:

I would say the last one because mass is not created nor destroyed.

Explanation:

When glucose (C6H12O6) reacts with oxygen (O2) to form CO2 and H2O, energy is released because this reaction is an exothermic process.

In an exothermic process, the energy of the products is lower than the energy of the reactants, resulting in the release of energy in the form of heat.

A Sugar is a naturally occurring substance that is found in plants, fruits, and blood and is a source of energy for living things, especially:

the sweet colorless soluble dextrorotatory form that occurs widely in nature and is the usual form in which carbohydrate is assimilated by animals

Here's a step-by-step explanation of the reaction:

1. Glucose (C6H12O6) combines with oxygen (O2) in a process called cellular respiration.
2. During cellular respiration, glucose is broken down into smaller molecules in a series of chemical reactions.
3. These reactions release energy, which is used by cells to perform various functions.
4. The byproducts of this reaction are carbon dioxide (CO2) and water (H2O), both of which have lower energy states than the reactants.
5. Because the energy of the products is lower than the energy of the reactants, energy is released during this reaction.

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Answer:

3CO + Fe₂O₃ = 2Fe + 3CO₂

The mass of aluminum needed to completely react with 3.83 mol of hydrochloric acid is approximately 34.44 grams.

To determine the mass of aluminum needed to react with 3.83 mol of hydrochloric acid, we need to use the stoichiometry of the balanced equation.

From the balanced equation: 2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g)

We can see that the mole ratio between aluminum (Al) and hydrochloric acid (HCl) is 2:6, or simplified, 1:3. This means that for every 1 mole of aluminum, we need 3 moles of hydrochloric acid.

Given that we have 3.83 mol of hydrochloric acid, we can set up the following proportion:

1 mol Al / 3 mol HCl = x mol Al / 3.83 mol HCl

Simplifying the proportion, we find:

x = (1 mol Al / 3 mol HCl) * 3.83 mol HCl

x = 1.277 mol Al

Now, we need to calculate the mass of aluminum using its molar mass. The molar mass of aluminum is approximately 26.98 g/mol.

Mass of aluminum = 1.277 mol Al * 26.98 g/mol Al

Mass of aluminum = 34.44 g

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24. The correct answer is (d) All (1), (2), and (3). ΔH = ΔU

25. The correct answer is (d) Because the net electrostatic interaction between ions surrounding the arbitrarily chosen central ion is repulsive not attractive.

24. The correct answer is (d) All (1), (2), and (3). ΔH = ΔU if:
(1) all reactants and products are present in their standard reference states,
(2) the change in the number of moles of gaseous species in the reaction is zero, and
(3) all reactants and products are presesnt in thier liquids or solids states because, for a good approximation, the volume does not change as a result of the reaction.

25. The correct answer is (d) Because the net electrostatic interaction among ions surrounding an arbitrarily chosen central ion is repulsive and nnor attractive.

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Resistance exercise can impact nitrogen balance by promoting an increase in muscle protein synthesis and reducing muscle protein breakdown. This results in a positive nitrogen balance, indicating that the body is retaining more nitrogen than it is excreting.

Resistance exercise stimulates muscle protein synthesis, which is the process of creating new proteins in muscle cells. This increase in protein synthesis requires a positive nitrogen balance, as proteins are composed of amino acids, and nitrogen is an essential component of amino acids. During resistance exercise, the body adapts to the increased demand by enhancing the rate of muscle protein synthesis.

Additionally, resistance exercise also reduces muscle protein breakdown. By engaging in resistance training, the body signals a need to preserve muscle tissue, leading to a decrease in muscle protein breakdown.

The combination of increased muscle protein synthesis and reduced protein breakdown results in a positive nitrogen balance, indicating that the body is retaining more nitrogen than it is losing. This is important for muscle growth and adaptation to resistance training.

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Answer:

I think it might be liquid

Answer: in a molecular molecules move just enough to stay close together but not to stick

Explanation:

The colors of flames in experiments can vary based on several factors, including the temperature and composition of the burning material.

In general, the color of a flame is determined by the emission spectrum of the excited molecules and atoms in the flame. When a material is burned, the heat and energy generated excites the molecules and atoms, causing them to emit light. The specific colors that are emitted depend on the temperature of the flame, as well as the chemical composition of the burning material.

For example, in a very hot flame, such as the flame produced by a welder's torch, the temperature can be high enough to excite and ionize the atoms of the burning material, causing them to emit light across the entire visible spectrum and beyond. This results in a flame that appears white.

In cooler flames, such as those produced by a candle, the temperature is not high enough to ionize the atoms, but it is still high enough to excite them and cause them to emit light. The specific colors that are emitted in this case depend on the chemical composition of the burning material. For example, in a candle flame, the wax is primarily composed of hydrocarbons, which emit a yellow-orange light when burned. The blue color that is often seen in the center of the flame is due to the reaction between the hydrogen and carbon in the wax, which produces excited molecules that emit blue light.

In conclusion, the colors of flames in experiments can vary based on the temperature and composition of the burning material. The specific colors that are observed depend on the conditions within the flame and the chemical reactions that are taking place.

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The weight percent of copper in bornite is approximately 63.316%.

The weight percent of copper (Cu) in bornite (Cu5FeS4) can be calculated by considering the atomic masses of copper (Cu), iron (Fe), and sulfur (S) and using the formula:

\(\[\text{{Weight percent of Cu}} = \frac{{\text{{Atomic mass of Cu}} \times \text{{Number of Cu atoms}}}}{{\text{{Formula mass of Cu5FeS4}}}} \times 100\%\]\)

Given that the atomic mass of Cu is 63.546 g/mol, the atomic mass of Fe is 55.845 g/mol, the atomic mass of S is 32.065 g/mol, and the formula mass of Cu5FeS4 is 501.849 g/mol, we can substitute these values into the formula:

\(\[\text{{Weight percent of Cu}} = \frac{{5 \times 63.546}}{{501.849}} \times 100\%\]\)

Simplifying the calculation gives:

\(\[\text{{Weight percent of Cu}} = 63.316\%\]\)

Therefore, the weight percent of copper in bornite is approximately 63.316%.

To calculate the gross value of the mining operation, we multiply the weight of the ore body (20,000,000 tons) by the cost per ton ($85):

\(\[\text{{Gross value}} = \text{{Weight of ore body}} \times \text{{Cost per ton}}\]\)

\(\[\text{{Gross value}} = 20,000,000 \times 85 = \$1,700,000,000\]\)

The expenses for the mining operation can be calculated by multiplying the weight of the ore body (20,000,000 tons) by the cost per ton ($85):

\(\[\text{{Expenses}} = \text{{Weight of ore body}} \times \text{{Cost per ton}}\]\)

\(\[\text{{Expenses}} = 20,000,000 \times 85 = \$1,700,000,000\]\)

The net value (profit or loss) of the mining operation can be obtained by subtracting the expenses from the gross value:

\(\[\text{{Net value}} = \text{{Gross value}} - \text{{Expenses}}\]\)\(\[\text{{Net value}} = \$1,700,000,000 - \$1,700,000,000 = \$0\]\)

Therefore, the net value of this mining operation is zero, indicating that there is neither profit nor loss.

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Answer:

a. 69.5% and 30.5%

Explanation:

we know there are two naturally occurring isotopes of Mg, Mg-24  and Mg-25.

First of all we will set the fraction for both isotopes

X for the isotopes having mass 25

1-x for isotopes having mass 24

The average atomic mass of Mg is 24.305 amu.

we will use the following equation,

25x + 24 (1-x) =  24.305

25x + 24 - 24x =  24.305

25x- 24x = 24.305 - 24

1x = 0.305

x= 0.305 /1

x= 0.305

0.305 × 100 = 30.5 %

30.5 % is abundance of Mg-25 because we solve the fraction x.

now we will calculate the abundance of Mg-24.

(1-x)

1-0.305 =0.695

0.695  × 100 = 69.5%

69.5%   for Mg-24.