you poured some 6% alcohol solution and some 12% alcohol solution into a mixing container. now you have 640 grams of 9% alcohol solution. how many grams of 6% solution and how many grams of 12% solution did you pour into the mixing container?

Find volume of pillow

L=78cm

B=55cm

H=25cm

\(\\ \bull\tt\longrightarrow V=LBH\)

\(\\ \bull\tt\longrightarrow V=25(78)(55)\)

\(\\ \bull\tt\longrightarrow V=107250cm^3\)

\(\\ \bull\tt\longrightarrow V=10.72m^3\)

Now

Mass=5.5kg

\(\\ \bull\tt\longrightarrow Density=\dfrac{Mass}{Volume}\)

\(\\ \bull\tt\longrightarrow Density=\dfrac{5.5}{10.72}\)

\(\\ \bull\tt\longrightarrow Density=0.5kg/m^3\)

Density of water=1000kg/m^3

As it is less than density of water it will float on water

The entropy of a system can decrease only if the entropy of the surrounding environment increases by a greater amount. This is a reflection of the second law of thermodynamics. Entropy is a measure of the degree of disorder or randomness in a system.

The higher the entropy, the higher the degree of disorder. In thermodynamics, the entropy of a closed system can never decrease over time. This is known as the second law of thermodynamics, which can be expressed in various ways, including the Clausius inequality, the Kelvin-Planck statement, and the Gibbs entropy formula.

However, in most cases, systems are not completely isolated, and there is an exchange of matter or energy with the surroundings. In such cases, the entropy of the system can decrease if the entropy of the surrounding environment increases by a greater amount. This is because the entropy of the universe, which is the sum of the entropy of the system and the entropy of the surrounding environment, always increases.

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Answer:

oxidation is the loss of electrone

reduction is gain of electrons

1. The solution with the highest freezing point is Solution 1 (4Cl).

This is because it has the lowest concentration of solute particles compared to the other solutions, resulting in less interference with the formation of the solid lattice structure of the solvent, thus a higher freezing point.

2. The solution with the highest vapor pressure is also Solution 1 (4Cl).

A lower concentration of solute particles means fewer solute-solvent interactions, allowing more solvent particles to escape into the vapor phase, leading to higher vapor pressure.

3. The solution with the highest boiling point is Solution 3 (0.25 M C6H12O6).

This is because it has the highest concentration of solute particles, resulting in a greater increase in boiling point due to increased solute-solvent interactions, which require more energy to break for the solvent to transition into the vapor phase.

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The aspirin solution was determined to have a concentration of 0.012 mol/L, and the pH of the solution was estimated to be around 1.74 using the aspirin's Ka value.

We must first establish the aspirin solution's concentration in moles per liter in order to calculate the pH of an aspirin solution in water (M).Aspirin comes in doses of 640 mg for adults, or 0.64 grams. Aspirin has a molar mass of 180.16 g/mol. As a result, there are: moles of aspirin in the solution.

0.64 g / 180.16 g/mol = 0.00355 mol

Next, we need to determine the volume of the solution in liters. One ounce is equal to 0.0296 liters, and 10 ounces is equal to 0.296 liters. The concentration of the aspirin solution in moles per liter is:

0.00355 mol / 0.296 L = 0.012 mol/L

Aspirin is a weak acid and can be modeled as a monoprotic acid, meaning it can donate one hydrogen ion (H⁺) to water. The dissociation of aspirin in water can be represented by the equation:

C₉H₈O₄ (aspirin) + H₂O ⇌ C₉H₇O₄⁻(aspirin ion) + H₃O⁺

The acid dissociation constant (Ka) for aspirin is approximately 3.3 x 10⁻⁴at 25°C. Using the Ka value and the initial concentration of the aspirin solution, we can calculate the concentration of H₃O⁺ ions in the solution and then convert it to pH:

Ka = [H₃O⁺][C₉H₇O₄⁻] / [C₉H₈O₄]

[H₃O⁺] = sqrt(Ka[C₉H₈O₄]/[C₉H₇O₄⁻]) = sqrt(3.3x10⁻⁴ x 0.012 / 0.012) = 0.018 M

pH = -log[H₃O⁺] = -log(0.018) = 1.74

Therefore, the pH of the aspirin solution is approximately 1.74.

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Answer:

Square

Explanation:

A square is a quadrilateral with r sides the same length

Answer:

56.0774g/mol

Explanation:

hope you like it ☺️

Answer:

The pH scale measures whether there is more hydronium or hydroxide in a solution. In other words, it tells us how basic or acidic the solution is. A lower pH means something is more acidic, also known as a stronger acid. A higher pH means it is more alkaline or a stronger base.

where it was formed and. conditions it was formed under

The moles of K₂SO₄ formed is 0.1785 moles, 6.069 g of ammonia is produced, volume of ammonia at STP is 8 cm³ and 8700 cm³ of ammonia is produced, measured at 20°C and 99.2 kPa.

The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.

A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.

Given,

Mass of KOH = 20g

Mass of ammonium sulfate = 15g

The reaction is -

2KOH + (NH₄)₂SO₄ = K₂SO₄ + 2NH₃ + H₂O

a. Moles of KOH = mass / molar mass

= 20 / 56

= 0.357 moles

From the reaction, 2 moles of KOH give 1 mole of potassium sulfate

So, 0.357 moles of KOH will give 0.357/2 = 0.1785 moles of  K₂SO₄

b. From the reaction, 2 moles of KOH give 2 moles of ammonia

so, 0.357 moles give 0.357 moles of ammonia

Mass of ammonia = 0.357 × 17 = 6.069 g

c. We know that,

1 mole = 22.4 cm³

So, 0.357 moles = 22.4 × 0.357

= 8 cm³

d. Pressure = 99.2 kPa

Temperature = 293K

PV = nRT

99200 × V = 0.357 × 8.314 × 293

V = 0.0087 m³ = 8700cm³

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a) The collision frequency of dimethyl ether can be calculated using the kinetic theory of gases. The collision frequency is given by the equation:

\(\[\text{{Collision frequency}} = \frac{1}{4} \sqrt{\frac{8 \cdot k \cdot T}{\pi \cdot m}}\]\)

where k is the Boltzmann constant, T is the temperature in Kelvin, and m is the mass of dimethyl ether molecule. Given that the angle-averaged radius of dimethyl ether is 0.25 nm, we can calculate the mass of the molecule using its density or molar mass.

b) To calculate the decomposition rate constant of (CH3)2CO, we need additional information such as the reaction mechanism and reaction conditions. The rate constant for a chemical reaction depends on factors like temperature, activation energy, and the presence of catalysts. Without these details, it is not possible to calculate the decomposition rate constant accurately.

In conclusion, the collision frequency of dimethyl ether at a specific temperature can be calculated using the kinetic theory of gases. However, to calculate the decomposition rate constant of (CH3)2CO, additional information about the reaction conditions and mechanism is needed.

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Answer:

0.5 g/mL----- float

1.0 g/mL---- float

2.0 g/mL-----sink

Explanation:

Those objects will float whose density is less or equal to water density due to lower mass while those object will sink whose density is greater than water because the mass of the object is greater than water. So the density of the object i. e. 0.5 g/mL and 1.0 g/mL will float in the liquid because its density is lower than water which is 1 g/mL while the density of an object i. e. 2.0 g/mL is denser than water so it will sink.

1. An increase in concentration increases the speed of reaction.

2. When temperature increases, average speed of molecules increases.

3. Average kinetic motion of molecules in a solution can be measured by measuring the heat in the solution.

As concentration increases, number of molecules in the solution increase, hence the reaction becomes faster. Since these factors increase in value, the frequency of collisions between the reactant molecules in the solution will increase, so the probability of collisions in right orientation and with right energy will be higher. Increase in temperature will increase the average speed and kinetic energy of the  molecules in solution. At constant volume, increased speed of reactant molecules in the solution will increase the probability of collisions in right orientation and right energy. Average kinetic energy of molecules in a solution can be measured using the equation, E=kT , where k = Boltzmann constant.

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The specific heat of the metal is 19.99 J / g·°C

Given,

We are required to find the specific heat of the metal.

Specific Heat Formula

We know that the specific heat of a substance is defined as the amount of heat energy required to raise the temperature of 1 gram of that substance by 1° C.

It is denoted by “C.”From the problem, the heat gained by the water will be equal to the heat lost by the metal. This can be represented by the equation below:

q gained by the water = q lost by the metal where, q = m * C * ∆T

where, m is the mass of the substance , C is the specific heat of the substance , ∆T is the change in temperature of the substance

The heat gained by the water can be calculated as:

q gained by the water = m * C * ∆T= 50.00 g * 4.184 J/g·°C * (20.15 - 12.6)°C= 50.00 g * 4.184 J/g·°C * 7.55°C= 1576.78 J

The heat lost by the metal can be calculated as:

q lost by the metal = m * C * ∆T= 25.00 g * C * (99.0 - 20.15)°C= 25.00 g * C * 78.85°C= 1971.25 C * g * °C

The two equations can be equated to get:

C * 78.85°C = 1576.78 JC = 1576.78 J / 78.85°C= 19.99 J / g·°C

Therefore, the specific heat of the unknown metal is 19.99 J / g·°C.

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Answer:

number of protons = number of electrons

Explanation:

when they have an equal number, each proton cancels out an electron which results in an neutral atom.

The substances that have Delta Hf = 0 kJ/mol are O2(g), Br2(l), He(g), Fe(s).

Delta Hf = 0 is the standard enthalpy of any element in its most stable form is equal to zero.

When enthalpy is negative, the delta Hf is minus zero, which means the system releases heat.

When the system gains heat, the delta Hf is positive.

Thus, the substances are O2(g),  Br2(l), He(g), Fe(s).

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Answer:

1,4,5,6

Explanation:

Answer:

There are 13 numbers in an aluminum atom and 13 electrons.

Explanation:

This is because the atomic number equals the number of protons and the atomic number of Al is 13.  The number of electrons also equals the number of protons.

Answer:

13, 13

Explanation:

The correct statements that describe the procedure for drawing a Lewis structure are:

c. For a neutral molecule, the sum of the number of valence electrons for each atom gives the number of electrons used in the Lewis structure.

e. An electron is added to the total count for each negative charge on the species.

a. This assertion is untrue. If two atoms are joined by a bond, a single bond representing two electrons should be placed between them; however, not every pair of atoms in the Lewis structure must be linked by a connection.

b. This assertion is untrue. Since they increase the number of valence electrons and have an impact on the overall structure, nonbonding electrons, sometimes referred to as lone pairs, should be included in the Lewis structure.

d. This assertion is untrue. Halogen atoms are typically not positioned in the structure's center. The arrangement of formal charges of the atoms in a molecule and their overall electronegativity determine where they are placed in a Lewis structure.

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To draw a Lewis structure, you should place single bonds between atoms, include nonbonding electrons, and use the sum of the valence electrons for a neutral molecule.

The correct statements that describe the procedure for drawing a Lewis structure are:

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Answer:

0.116 moles of ammonia can be produced from the reaction of 4.0 liters of hydrogen at 50.0°C and 1.2atm of pressure with excess nitrogen.

Explanation:

The balanced chemical equation for the reaction of hydrogen and nitrogen to form ammonia is:

N2(g) + 3H2(g) → 2NH3(g)

To determine how many moles of ammonia can be produced from the reaction of 4.0 liters of hydrogen at 50.0°C and 1.2atm of pressure with excess nitrogen, we need to use the ideal gas law equation:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

First, we need to convert the volume of hydrogen gas to moles using the ideal gas law equation:

n = PV/RT

where P is the pressure in atm, V is the volume in liters, R is the gas constant (0.0821 L·atm/mol·K), and T is the temperature in Kelvin.

n = (1.2 atm)(4.0 L)/(0.0821 L·atm/mol·K)(50.0°C + 273) = 0.174 mol H2

Since there is excess nitrogen, all of the hydrogen will react to form ammonia. Using the mole ratio between NH3 and H2 from the balanced chemical equation:

2 mol NH3 / 3 mol H2

we can calculate how many moles of NH3 will be produced:

n(NH3) = (0.174 mol H2) × (2 mol NH3 / 3 mol H2) = 0.116 mol NH3

Therefore, 0.116 moles of ammonia can be produced from the reaction of 4.0 liters of hydrogen at 50.0°C and 1.2atm of pressure with excess nitrogen.

The answer is (b) 5.62 M. The Molarity (M) Of HNO3, [MW=63.02] in an aqueous solution that is 30.0% HNO3 by mass and has a density of 1.180 g/mL is 5.62 M.

To calculate the molarity (M) of HNO3 in the given solution, we first need to find the mass of HNO3 present in 1 liter of the solution.

Let's assume we have 1 liter of the solution, which has a mass of:

mass = volume x density = 1000 mL x 1.180 g/mL = 1180 g

Since the solution is 30% HNO3 by mass, the mass of HNO3 present in 1 liter of the solution is:

mass of HNO3 = 0.3 x 1180 g = 354 g

To calculate the molarity of HNO3, we need to know how many moles of HNO3 are present in 1 liter of the solution. We can use the molecular weight (MW) of HNO3 to convert from grams to moles:

moles of HNO3 = mass of HNO3 / MW of HNO3 = 354 g / 63.02 g/mol = 5.62 mol

Finally, we can calculate the molarity of HNO3 by dividing the number of moles by the volume of the solution (in liters):

Molarity of HNO3 = moles of HNO3 / volume of solution = 5.62 mol / 1 L = 5.62 M

Therefore, the answer is (b) 5.62 M.

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The evidence that refutes the statement is: 4 EVIDENCE: Scientists have observed galaxies are moving away from us.

According to the observations made by astronomers, galaxies in the universe are not only moving away from each other, but they are also moving away from us.

This phenomenon is known as the expansion of the universe, and it contradicts the idea that all matter and energy in the universe was initially concentrated in a tiny corner of space during the time of the big bang and has since filled up the entire universe.

The observation that galaxies are moving away from us suggests that the universe is expanding in all directions. This expansion implies that the universe was not initially confined to a specific location but rather underwent a rapid expansion from a highly dense and hot state.

Therefore, the idea that all matter and energy in the universe was initially concentrated in a small corner of space and then expanded to fill up the whole universe is inaccurate based on the evidence of the observed expansion of galaxies. Evidence 4

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Answer:

the second one that is it

Explanation:

bc i am o smaart like tht

Planes do not produce oxygen through photosynthesis as they are not living organisms. However, if you are asking what happens to the oxygen produced in photosynthesis, most of it is released into the atmosphere.

What is photosynthesis?Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy in the form of glucose (sugar) while producing oxygen from carbon dioxide and water as a byproduct. The process is essential to the survival of most organisms on Earth that depend on it as a source of food and oxygen.In this process, chlorophyll pigments in the leaves of plants absorb light energy, which is then used to split water molecules into oxygen and hydrogen ions.

The oxygen is released into the atmosphere as a byproduct, while the hydrogen ions and energy are used to convert carbon dioxide into glucose molecules.In summary, planes do not produce oxygen through photosynthesis. However, the oxygen produced in photosynthesis is released into the atmosphere as a byproduct. This is a long answer.

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The concentration of Cd²+ in 1 L of the solution is approximately 2.94 x 10⁻⁸ M.

To calculate the concentration of Cd²+ in the solution, we need to consider the formation of the complex ion (Cd(NH₃)₄)²⁺ and the equilibrium between Cd²+ and the complex ion.

Step 1: Write the balanced equation for the formation of the complex ion:

Cd²+ + 4NH₃ ⇌ (Cd(NH₃)₄)²⁺

Step 2: Write the equilibrium expression for the formation of the complex ion:

Kf = [Cd(NH₃)₄]²⁺ / [Cd²+][NH₃]⁴

Step 3: Substitute the known values into the equilibrium expression:

Kf = [Cd(NH₃)₄]²⁺ / ([Cd²+] * [NH₃]⁴)

Since we are neglecting complexes containing fewer than four ammonia ligands, the concentration of NH₃ remains unchanged.

Step 4: Rearrange the equation to solve for [Cd(NH₃)₄]²⁺:

[Cd(NH₃)₄]²⁺ = Kf * [Cd²+] * [NH₃]⁴

Step 5: Substitute the known values:

Kf = 1.8 x 10⁻⁷

[Cd²+] = 10⁻³ mol / 1 L = 10⁻³ M

[NH₃]⁴ = 1.5 mol / 1 L = 1.5 M

Step 6: Calculate [Cd(NH₃)₄]²⁺:

[Cd(NH₃)₄]²⁺ = (1.8 x 10⁻⁷) * (10⁻³) * (1.5)⁴

Step 7: Calculate [Cd²+]:

Since one Cd²+ ion reacts with one (Cd(NH₃)₄)²⁺ complex, the concentration of Cd²+ is equal to the concentration of (Cd(NH₃)₄)²⁺:

[Cd²+] = [Cd(NH₃)₄]²⁺ = (1.8 x 10⁻⁷) * (10⁻³) * (1.5)⁴

By calculating the expression, we find that the concentration of Cd²+ in 1 L of the solution is approximately 2.94 x 10⁻⁸ M.

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Answer:

This is because peroxy oxygen bonded to hydrogen can easily undergo nucleophilic protonation with the carbonyl carbon to form an alcohol

Explanation:

A ketone is a functional group that contains a carbonyl group (carbon-oxygen double bond ( R1R2-C=O).

The carbonyl carbon doubly bonded to the oxygen is electron deficient as a result of difference in electronegativity between carbon and oxygen, hence is susceptible to nucleophilic attacks

R1R2 - C = O

where R1 and R2 are organic substituents.

The peroxy oxygen that is bonded to hydrogen (H -O-O-R) is the electron-rich centre and easily attacks electron-deficient centres like the carbonyl carbon in ketones to form an alcohol.

The bond between the hydrogen attached to the peroxy oxygen is broken and the resultant hydrogen ion undergoes protonation with the oxygen of the carbonyl group to form an alcohol

R1R2 - C = O + H - O-O - R =>

R1R2- CH - OH + R - O-O-R1

The concentration in molarity of NaCl, glucose, and aspirin in the mixture can be calculated by considering the volumes and molarities of each component.

For NaCl:

The initial volume of NaCl is 1.0 L, and its initial concentration is 0.1 mol/L. Since there is no chemical reaction between the compounds, the volume and amount of NaCl remain constant. Therefore, the concentration of NaCl in the mixture remains at 0.1 mol/L.

For glucose:

The initial volume of glucose is 1.0 L, and its initial concentration is 0.5 mol/L. Again, since there is no chemical reaction, the volume and amount of glucose remain constant. Thus, the concentration of glucose in the mixture remains 0.5 mol/L.

For aspirin:

The initial volume of aspirin is 2.0 L, and its initial concentration is 0.01 mol/L. As there is no chemical reaction, the volume and amount of aspirin remain constant. Consequently, the concentration of aspirin in the mixture remains at 0.01 mol/L.

Therefore, the concentration in molarity of NaCl, glucose, and aspirin in the mixture is 0.1 mol/L, 0.5 mol/L, and 0.01 mol/L, respectively.

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