at 25.0° c, a 10.00 l vessel is filled with 7.00 atm of gas a and 5.89 atm of gas b. what is the mole fraction of gas b? a) 12.89 b) 0.543 c) 0.457 d) 2.89

Answer:

Resources

Explanation:

Answer:

Explanation:

M

Answer:

no

Explanation:Unused chemicals are never returned to their original containers because you will be contaminating the chemical. Dispose of unused chemicals in the proper containers.

It is true that electromagnetic waves can travel in empty space or space that has no particles.

The correct option is True.

Waves of the electromagnetic field make up electromagnetic radiation; they travel through space while carrying momentum and radiant energy. It consists of X-rays, gamma rays, microwaves, infrared, light, and radio waves.

Electromagnetic waves include radio waves, television waves, and microwaves. The only thing separating them is the wavelength. The wavelength is the distance between each wave's peak and the next.

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The reason behind the acceptance of Darwin's theory is D It is supported by practical evidence and examples.

The theory of evolution proposed by Charles Darwin is a well sustained model that explains how animals change in order to adapt to an ever-changing enviroment, which is supported by scientific evidence and observations.

Therefore, with this data, we can see that the theory of evolution proposed by Charles Darwin is well sustained by evidence obtained from experimentation and also observations of the natural world.

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Dalton's atomic model, proposed by John Dalton in 1803, was one of the first scientific explanations of the nature of atoms. It is based on four key ideas: Atoms are indivisible and indestructible; Atoms of different elements have different atomic weights; Atoms of the same element are identical; Atoms combine in definite ratios to form compounds.

Atoms are indivisible and indestructible. This means that atoms cannot be broken down into smaller particles, and they cannot be created or destroyed.

Atoms of different elements have different atomic weights. This means that atoms of one element are different from atoms of another element based on their weight.

Atoms of the same element are identical. This means that all atoms of a given element have the same properties and characteristics.

Atoms combine in definite ratios to form compounds. This means that when atoms of different elements combine to form a compound, they do so in a specific ratio.

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"The amount of energy absorbed or released in the process of melting or freezing is the same per gram of substance" is true.

The amount of energy absorbed or released during the process of melting or freezing, known as the heat of fusion, is the same per gram of substance. This is a fundamental property of phase transitions. When a substance undergoes melting, it absorbs heat energy to break the intermolecular forces holding the particles together and transition from a solid to a liquid state. Conversely, during freezing, the substance releases the same amount of heat energy as it transitions from a liquid to a solid state, with the particles forming ordered arrangements and reestablishing intermolecular forces. Since the heat of fusion is a specific characteristic of a substance, it remains constant per gram of the substance, regardless of the quantity being melted or frozen.

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Respuesta:

Cr₂S₃O₁₂

Explicación:

Primer paso: Dividir el porcentaje en masa de cada elemento por su masa atómica

Cr: 26,53/52 = 0,510

S: 24,52/32 = 0,766

O: 48,96/16 = 3,06

Segundo paso: Dividir todos los números por el más pequeño (0,510)

Cr: 0,510/0,510 = 1

S: 0,766/0,510 = 1,5

O: 3,06/0,510 = 6

Tercer paso: Multiplicar todos los números por algún número que haga que todos sean enteros (2)

Cr: 1 × 2 = 2

S: 1,5 × 2 = 3

O: 6 × 2 = 12

La fórmula empírica es Cr₂S₃O₁₂.

Answer: The empirical formula of the compound becomes \(Cr_2S_3O_{12}\)

Explanation:

The empirical formula is the chemical formula of the simplest ratio of the number of atoms of each element present in a compound.

Let the mass of the compound be 100 g

Given values:

% of Cr = 26.53%

% of S = 24.52%

% of O = 48.96%

Mass of Cr = 26.53 g

Mass of S = 24.52 g

Mass of O = 48.96 g

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

\(\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\) ......(1)

To formulate the empirical formula, we need to follow some steps:

Molar mass of Cr = 52 g/mol

Molar mass of S = 32 g/mol

Molar mass of O = 16 g/mol

Putting values in equation 1, we get:

\(\text{Moles of Cr}=\frac{26.53g}{52g/mol}=0.510 mol\)

\(\text{Moles of S}=\frac{24.52g}{32g/mol}=0.766 mol\)

\(\text{Moles of O}=\frac{48.96g}{16g/mol}=3.06 mol\)

Calculating the mole fraction of each element by dividing the calculated moles by the least calculated number of moles that is 0.510 moles

\(\text{Mole fraction of Cr}=\frac{0.510}{0.510}=1\)

\(\text{Mole fraction of S}=\frac{0.766}{0.510}=1.5\)

\(\text{Mole fraction of O}=\frac{3.06}{0.510}=6\)

Multiplying the mole fraction of all the elements by 2, in order to make it as a whole number

\(\text{Mole fraction of Cr}=(2\times 1)=2\)

\(\text{Mole fraction of S}=(2\times 1.5)=3\)

\(\text{Mole fraction of O}=(2\times 6)=12\)

The ratio of Cr : S : O = 2 : 3 : 12

Hence, the empirical formula of the compound becomes \(Cr_2S_3O_{12}\)

Answer:

im sorry dude, just trying to complete my daily challenge

Explanation:

Answer:

I believe the answer is

"He is monitoring oxygen. The amount of gas released should be highest for the plant closest to the window and lowest for the plant farthest away from the window."

Explanation:

I may be wrong but thats my guess it seems the most accurate

The volume of the sodium carbonate needed to precipitate is 31.248 ml. This is calculated using the dilution formula.

The molarity of the solution and the volume of the first solution can be correlated with the molarity and the volume of diluted solution. It is called as dilution formula.

Molar concentration is the another term for molarity. Molarity is a measure of the concentration of a chemical species in particular of a solute in a solution in terms of amount of substance per unit volume of solution.

The expression for molarity of the solution is,

M1 V1 = M2 V2

here we have 0.125 m sodium carbonate solution would be needed to precipitate the calcium ion from 37.2 ml of 0.105 m cacl2 solution.  

putting all the values we get,

0.105 * 37.2 = 0.125 * V2

V2 = 31.248

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Bleach is made to be pseudo-zero-order, bleach will speed up the rate of reaction as it gets more concentrated in solution.

As a result, reactions with zero-order kinetics are sometimes alluded to it as pseudo-zero-order reactions. Obviously, a zero-order reaction cannot proceed when a reactant is depleted.

Right before this point, the response will revert to some other rate law rather of going immediately to zero, as seen in the top left. Bleach is made to be pseudo-zero-order, bleach will speed up the rate of reaction as it gets more concentrated in solution.

Therefore, bleach will speed up the rate of reaction as it gets more concentrated in solution.

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A mole is defined as the amount of substance in grams that has a number of particles equal to the number of atoms in 12 g of carbon-12. One mole of any substance has a mass equal to its molecular or atomic weight. Molarity is expressed as moles of solute per liter of solution.

Therefore, we can use the following formula to calculate the number of moles of solute contained in a specific volume of a solution: moles of solute = molarity x volume of solution, To calculate the number of moles of sodium hydroxide (NaOH) in 2.00 L of a 2.6 M NaOH solution.

We will use the above formula: moles of NaOH = molarity x volume of solution = 2.6 M x 2.00 L = 5.2 moles of NaOH. So, there will be 5.2 moles of NaOH contained in 2.00 L of a 2.6 M NaOH solution.

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The retention time is 20.4 minutes. The percentage of peak A in the mixture is 33.3%

1. The retention time can be calculated by dividing the distance from the injection point by the chart speed.

The retention time is 20.4 minutes.

Distance from injection point = 10.2 cm

Chart speed = 0.5 cm/min

Retention time = Distance from injection point / Chart speed

                        = 10.2 cm / 0.5 cm/min

                        = 20.4 min

Therefore, the retention time is 20.4 minutes.

The retention time is a measure of the time it takes for a compound to travel through the gas chromatography column and reach the detector. In this case, with a sample located 10.2 cm from the injection point and a chart speed of 0.5 cm/min, the retention time is 20.4 minutes.

2. The percentage of peak A in the mixture can be calculated by dividing the height of peak A by the sum of the heights of both peaks, and then multiplying by 100.

The percentage of peak A in the mixture is 33.3%.

Height of peak A = 2 cm

Height of peak B = 4 cm

Percentage of peak A = (Height of peak A / (Height of peak A + Height of peak B)) * 100

                             = (2 cm / (2 cm + 4 cm)) * 100

                             = (2 cm / 6 cm) * 100

                             = 33.3%

Therefore, the percentage of peak A in the mixture is 33.3%.

The percentage of peak A in the mixture represents the relative abundance or concentration of peak A compared to the total height of both peaks. In this case, with peak A having a height of 2 cm and peak B having a height of 4 cm, the percentage of peak A in the mixture is 33.3%.

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The bonding model for sodium metal and sodium chloride are fundamentally different, reflecting the differences between metallic and ionic bonds. The metallic bond in sodium metal is characterized by free electrons, while the ionic bond in sodium chloride is characterized by the strong electrostatic forces between positive and negative ions.

Sodium (Na) is a metal, and its bonding model is based on the metallic bond. In a metallic bond, the valence electrons are not bound to any one individual atom, but instead are free to move through the entire metallic lattice, resulting in a highly conductive, solid material. The metallic bond is held together by electrostatic attraction between the positively charged metal ions and the negatively charged electrons.

On the other hand, sodium chloride (NaCl) is an ionic compound, and its bonding model is based on the ionic bond. In an ionic bond, electrons are transferred from one atom to another atom, resulting in the formation of ions. The positive and negative ions are held together by strong electrostatic forces.

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Answer:

The ocean is made up of salt water, which is a combination of fresh water, plus minerals collectively called "salts." These salts aren't just sodium and chloride (the elements that make up our table salt), but other minerals such as calcium, magnesium, and potassium, among others.

Explanation:The answer is since particles can be found in ocean water It is a compound, since it results from the combination of elements It is a solution

Answer:

The correct option is (c).

Explanation:

Given that,

Mass of iron, m = 3 kg = 3000 g

The temperature of ice increases from 20° C to 25°C.

The specific heat of iron is 0.45 J/g°C

We need to find the energy required to raise the temperature. The formula is given by :

\(Q=mc\Delta T\\\\Q=3000\times 0.45\times (25-20)\\\\Q=6750\ J\)

So, 6750 J of energy is required to raise the temperature or iron.

Answer:

more energy is absorbed when the bonds in the reactants are broken

Explanation:

Using a fractional column will help to separate liquids whit different boiling points since the mixture contain ethanol water and propanaol. Ethanol will be the first to be extracted since it has a low boiling point then it would be water and then propanaol.

To selectively precipitate one of the ions, we could use sulfide ions (S2-). To selectively precipitate Ni2+, a sulfide ion concentration of approximately 5.5 x 10^-17 M would be required. To selectively precipitate Sn2+, a sulfide ion concentration of approximately 3.3 x 10^-18 M would be required.

To determine which ion would precipitate out first, we need to compare the solubility product constants (Ksp) of the sulfide salts of Ni2+ and Sn2+. The sulfide salts with the lower Ksp value will precipitate out first.

The Ksp for NiS is 2.0 x 10^-16 and the Ksp for SnS is 1.0 x 10^-28. Since the Ksp for NiS is larger than that of SnS, we can selectively precipitate Ni2+ ions by adding sulfide ions.

To calculate the sulfide ion concentration required to selectively precipitate Ni2+, we use the Ksp expression:

NiS = [Ni2+][S2-]^2

Substituting the given Ni2+ concentration and the Ksp for NiS, we can solve for the sulfide ion concentration:

2.0 x 10^-16 = (0.0200 M)(S2-) ^2

S2- = sqrt(2.0 x 10^-16 / 0.0200 M)

= 5.5 x 10^-17 M

Thus, to selectively precipitate Ni2+ ions, a sulfide ion concentration of approximately 5.5 x 10^-17 M would be required.

Similarly, to selectively precipitate Sn2+, we can use the Ksp expression for SnS:

SnS = [Sn2+][S2-]^2

Substituting the given Sn2+ concentration and the Ksp for SnS, we can solve for the sulfide ion concentration:

1.0 x 10^-28 = (0.0200 M)(S2-) ^2

S2- = sqrt(1.0 x 10^-28 / 0.0200 M)

= 3.3 x 10^-18 M

Thus, to selectively precipitate Sn2+ ions, a sulfide ion concentration of approximately 3.3 x 10^-18 M would be required.

Sulfide ions (S2-) could be used to selectively precipitate either Ni2+ or Sn2+ ions. To selectively precipitate Ni2+, a sulfide ion concentration of approximately 5.5 x 10^-17 M would be required, while a concentration of approximately 3.3 x 10^-18 M would be required to selectively precipitate Sn2+.

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A chef finds a sealed container consisting of an ingredient that goes into his restaurant's secret sauce. After the phase change, the ingredient molecules will move faster, and the ingredient will be a liquid.

The molecules of the item will move more quickly if the chef applies energy to the sealed container, causing the ingredient to transform from a solid to a liquid. This is so that the molecules may move about more freely when the energy input breaks the intermolecular connections that keep the component in a solid form. The molecules of solid substance will accumulate kinetic energy as the temperature rises, causing them to vibrate more fiercely in place.

The molecules will lose their intermolecular connections once the temperature hits the melting point, changing the ingredient's phase from a solid to a liquid. The constituent molecules move more freely in the liquid phase than they could in solid phase, but they will still be relatively close to one another and exhibit some intermolecular interaction. The temperature of the liquid will affect how quickly the molecules travel, with greater temperatures making this happen.

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Answer:

E = hf

E = hc/lamda

where E-energy,

h-planck's constant (6.62 x 10^-34 Js)

f- frequency ( f = c/lamda)

c-velocity of light ( 3 x 10^8 m/s)

lamda- wavelength

you can this formula to solve all the 4 questions.

After one day, approximately 8.67mg of the sample will be remaininga) The function that models the sample of Technetium-99 is given by

f(t) = P₀e^(-kt)

Where,P₀ = initial quantity = 100mgk = decay constantt = timef(t) = remaining quantity after t time.

A half-life of 6 hours is given. The decay constant can be found using the half-life formula:

T½ = (ln 2)/k6

= (ln 2)/kk

= (ln 2)/6f(t)

= P₀e^(-kt)f(t)

= 100e^(-0.1155t)mg

b) After one day, 24 hours = 4 half-lives Remaining amount,

f(t) = P₀e^(-kt)f(24)

= 100e^(-0.1155 × 24)

= 100e^(-2.772)

≈ 8.67mg

After one day, approximately 8.67mg of the sample will be remaining. The function that models the sample is

f(t) = 100e^(-0.1155t), where t is time in hours and f(t) is the remaining quantity in milligrams.

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After one day, approximately 8.67mg of the sample will be remaininga) The function that models the sample of Technetium-99 is given by

f(t) = P₀e^(-kt)

Where,P₀ = initial quantity = 100mgk = decay constantt = timef(t) = remaining quantity after t time.

A half-life of 6 hours is given. The decay constant can be found using the half-life formula:

T½ = (ln 2)/k6

= (ln 2)/kk

= (ln 2)/6f(t)

= P₀e^(-kt)f(t)

= 100e^(-0.1155t)mg

b) After one day, 24 hours = 4 half-lives Remaining amount,

f(t) = P₀e^(-kt)f(24)

= 100e^(-0.1155 × 24)

= 100e^(-2.772)

≈ 8.67mg

After one day, approximately 8.67mg of the sample will be remaining. The function that models the sample is

f(t) = 100e^(-0.1155t), where t is time in hours and f(t) is the remaining quantity in milligrams.

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The value of K_eq for this reaction is approximately 1.805 × 10^-5.

To find the value of the equilibrium constant (K_eq) for the given reaction, we can use the equilibrium concentrations of the species involved. The equilibrium constant expression for the reaction is:

K_eq = [CH3COO-][H3O+] / [CH3COOH]

Given the following concentrations at equilibrium:

[CH3COOH] = 2.0 × 10^-1 M

[CH3COO-] = 1.9 × 10^-3 M

[H3O+] = 1.9 × 10^-3 M

Substituting these values into the equilibrium constant expression, we get:

K_eq = (1.9 × 10^-3)(1.9 × 10^-3) / (2.0 × 10^-1)

K_eq = 3.61 × 10^-6 / 2.0 × 10^-1

K_eq = 3.61 × 10^-6 × 5.0 × 10^0

K_eq = 1.805 × 10^-5

Therefore, the value of K_eq for this reaction is approximately 1.805 × 10^-5.

None of the provided answer choices match this value exactly.

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It contain 2 mol of HCl. To find the moles of HCl, you have to change the volume units into dm³ or liter.

How to calculate the value of that HCl mole?

As per data given:

Vacid = 100 cm³

Molacid = 0.2 mol/dm³ = 0.2 mol/L

First, we have to change volume unit into liter or dm³. So

Vacid =  100 cm³ = 0.1 L

Then calculate the moles of HCl:

Moles of HCl = Molacid : Vacid

Moles of HCl = 0.2 : 0.1

Moles of HCl = 0.2 x 10

Moles of HCl = 2 mol

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Oxygen atom in a water molecule is greedy for electrons, giving it a negative charge.

Because oxygen is more electronegative (electron-greedy) than hydrogen, it grabs electrons and keeps them away from the H atoms. This results in a partial negative charge on the oxygen end of the water molecule and a partial positive charge on the hydrogen end.

What is a molecule?

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The materials that pick up positive charge are nylon rubbed with wool and which pick up negative charge is glass rubbed with silk. You can determine this by degree of electron affinity.

When different materials are rubbed together, one material will gain electrons from the other and become negatively charged. The material that loses electrons will become positively charged. Here are some examples: Materials that pick up negative charge include glass rubbed with silk, wool rubbed with amber, and rubber rubbed with fur.

Materials that pick up positive charge include nylon rubbed with wool, and polythene rubbed with rabbit fur. The determination of whether a material will become positively or negatively charged depends on the degree of electron affinity.

When two different materials are rubbed together, the electrons move from one material to another due to the difference in electron affinity and one material gains an electron while the other loses an electron. This is the reason why certain materials become positively charged and others become negatively charged.

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It should be at beginning. A hypothesis is called an educated guess of what might happen in the experiment.

Please brainliest

Answer:

false

Explanation:

To determine the identity of the metal, we need to use Faraday's law of electrolysis, which relates the amount of material deposited on an electrode to the number of electrons passed through the electrode during electrolysis.

The equation for Faraday's law is:

m = (Q * M) / (n * F

where:

m = mass of the metal deposited

Q = total electric charge passed through the electrolytic cell (in coulombs)

M = molar mass of the metal

n = number of electrons required to reduce one mole of the metal ions

F = Faraday constant (96485 C/mol)

We are given Q = 650 C and m = 0.19774 g. We also know that the mole ratio of metal to electrons is 1:2. Therefore, n = 2.

Rearranging the equation, we get:

M = (m * n * F) / (Q)

Substituting the given values, we get:

M = (0.19774 g * 2 * 96485 C/mol) / (650 C) = 58.70 g/mol

This value is the molar mass of the unknown metal.

To identify the metal, we need to compare this molar mass to the molar masses of known elements. The closest match is to copper (Cu), which has a molar mass of 63.55 g/mol. Since the two values are relatively close, it is possible that the unknown metal is copper.

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Answer:

See explanation

Explanation:

Copper II oxide is a base but not an alkali. An alkali is a soluble base. Since Copper II oxide is not soluble in water then it is not an alkali.

Let us recall that the change of colour of litmus with an alkali requires the presence of water. In the absence of water, solid Copper II oxide does not turn red litmus paper blue.

The ability to turn red litmus paper blue is commonly observed with alkalis and Copper II oxide is not an alkali.

Also recall that since Copper II oxide is not soluble, hydroxide ions are absent hence Copper II oxide does not turn red litmus paper blue.

Answer: Denver is named after James W. Denver, a governor of the Kansas Territory. It is nicknamed the Mile High City because its official elevation is exactly one mile (5280 feet or 1609.344 meters) above sea level.