Calculate the mass/volume percent, % (m/v) for the solute in each of the following solution60 g of Na2SO4 in 270 mL of Na2SO4 solution

when P and T are constant the coeficient V/n is constant too:

In this case we have V1, n1 and n2 (the sum of the initial 0.79mols plus the added 0.24mols) and the ask for V2 so we solve for V2 and use the data provided in the text

Answer:

P1V1=P2V2

Explanation:

because volume is inversely proportional to pressure provided that temperature remains constant

The electron transition from n=6 to n=2 results in the emission of light of the longest wavelength.

What is Electron?

An electron is a subatomic particle that has a negative charge. It is one of the fundamental particles that make up an atom, along with protons and neutrons. Electrons are found outside the nucleus of an atom in regions known as electron shells or energy levels. They are involved in various chemical reactions and can be transferred between atoms, which is the basis for electricity and many other phenomena in the physical world.

The energy of the emitted photon when an electron in a hydrogen atom undergoes a transition from an initial energy level ni to a final energy level nf is given by:

E = hc/λ = Rh[(1/ni^2) - (1/nf^2)]

where h is Planck's constant, c is the speed of light, λ is the wavelength of the emitted photon, Rh is the Rydberg constant, and ni and nf are the initial and final energy levels of the electron, respectively.

The longest wavelength corresponds to the lowest energy transition. Therefore, we need to find the transition with the lowest energy. From the given options, the transition from n=6 to n=2 has the lowest energy:

E = Rh[(1/6^2) - (1/2^2)] = -0.61 Rh

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The highest boiling point based on the data is option 4

Compared to alcohols of comparable molecular weight, carboxylic acids often have higher boiling temperatures. Between the hydrogen atoms of adjacent molecules and the oxygen in the carboxyl group of carboxylic acids, strong intermolecular hydrogen bonds can develop. Because it takes more energy to break the intermolecular interactions and change the substance from a liquid to a gas during boiling, these hydrogen bonds help materials have higher boiling temperatures.

Although carboxylic acids and alcohols are both capable of forming hydrogen bonds, carboxylic acids have higher boiling temperatures due to the extra carboxyl group that they contain.

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Answer:

KMnO4,H3O^+,75°C

Explanation:

The conversion of cyclohexene to trans-1,2-cylohexanediol is an oxidation reaction. Alkenes are oxidized in the presence of potassium permanganate and acids to yield the corresponding diols.

These diols may also be called glycols. They are molecules that contain two -OH(hydroxyl) groups per molecule. The reaction closely resembles the addition of the two -OH groups of hydrogen peroxide to an alkene.

The bright color of potassium permanganate disappears in this reaction so it can be used as a test for alkenes.

Approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

To determine the number of molecules of HCl required to form 34.52 g of MgCl₂, we need to use the molar mass and stoichiometry of the balanced equation:

Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)

The molar mass of MgCl₂ is 95.21 g/mol.

First, we need to calculate the number of moles of MgCl₂ formed:

Moles of MgCl₂ = mass of MgCl₂ / molar mass of MgCl₂

Moles of MgCl₂ = 34.52 g / 95.21 g/mol

Moles of MgCl₂ = 0.363 mol

According to the balanced equation, the stoichiometric ratio between HCl and MgCl₂ is 2:1. Therefore, the moles of HCl required can be calculated as follows:

Moles of HCl = 2 * Moles of MgCl₂

Moles of HCl = 2 * 0.363 mol

Moles of HCl = 0.726 mol

To calculate the number of molecules, we need to use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of molecules of HCl = Moles of HCl * Avogadro's number

Number of molecules of HCl = 0.726 mol * 6.022 x 10^23 molecules/mol

Number of molecules of HCl = 4.37 x 10^23 molecules

Therefore, approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

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Answer:

protons and neutrons are located in the nucleus.

The given question is incomplete.

The complete question is:

When methane is burned with oxygen, the products are carbon dioxide and water. If you produce 9 grams of water and 11 grams of carbon dioxide from 16 grams of oxygen, how many grams of methane were needed for the reaction?

Answer: 4 grams of methane were needed for the reaction

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

{tex]CH_4+2O_2\rightarrow CO_2+H_2O\)

Given:  mass of oxygen = 16 g

Mass of carbon dioxide = 11 g

Mass of water = 9 g

Mass of products = Mass of carbon dioxide + mass of water = 11 g  +9 g = 20 g

Mass or reactant = mass of methane + mass of oxygen = mass of methane + 16 g

As mass of reactants = mass of products

mass of methane + 16 g= 20 g

mass of methane  = 4 g

Thus 4 grams of methane were needed for the reaction

In order to arrange candidates for recruiting and recruitment purposes, businesses use applicant tracking systems (ATS).

The complete question is,

What do ATSs serve as their primary function?

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Calculating Standard Product ATS, The allocation, presale backorder allocation, turnover, and (optional) on order quantity are added together to form the ATS.

Calculating Standard Product ATS, The allocation, presale backorder allocation, turnover, and (optional) on order quantity are added together to form the ATS. It's equal to the quantity of a product that is reserved for sale by default (the allocation value).

Repeating measurements is the best technique to determine the degree of uncertainty surrounding a set of data.

Mixture ~2 g

T2g = 64.7 ± 0.3°C

Cot 2g 6 e g o

Since all the electrons in t 2g are coupled up, the ligand must have a strong field, and that ligand is oxalate (C 2 O 4).

2−

[Co(C 2 O 4 ) 3] is the name of the substance.

3+

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Answer:

\(t=9.7s\)

Explanation:

Hello,

In this case, we have a second order kinetics given the second power of the concentration of chlorine (V) oxide in the rate expression, thus, the integrated equation for the concentration decay is:

\(\frac{1}{[Cl_2O_5]}=kt+\frac{1}{[Cl_2O_5]_0}\)

Thus, the final concentration for a 94% decrease is:

\([Cl_2O_5]=0.600M-0.600M*0.94=0.036M\)

Therefore, we compute the time for such decrease:

\(kt=\frac{1}{[Cl_2O_5]}-\frac{1}{[Cl_2O_5]_0}=\frac{1}{0.036M}-\frac{1}{0.60M} =26.1M^{-1}\)

\(t=\frac{26.1M^{-1}}{k}= \frac{26.1M^{-1}}{2.7M^{-1}*s^{-1}}\\\\t=9.7s\)

Regards.

Approximately 48.64 grams of iron(III) oxide will be produced.

To solve this problem, we need to use the balanced chemical equation for the reaction between iron and water vapor:

\(3 Fe + 4 H_2O - Fe_3O_4 + 4 H_2\)

From the equation, we can see that 3 moles of Fe react with 4 moles of \(H_2O\) to produce 1 mole of \(Fe_3O_4\) and 4 moles of \(H_2\).

First, we need to calculate the number of moles of water vapor present:

\(n(H_2O) = PV/RT\)

where P is the pressure in atm, V is the volume in L, R is the gas constant (0.08206 L·atm/K·mol), and T is the temperature in Kelvin.

Converting the temperature to Kelvin:

\(T = 50.2 + 273.15 = 323.35 K\)

\(n(H_2O) = (0.121 atm)(5.50 L)/(0.08206 L·atm/K·mol)(323.35 K) \\= 0.840 mol\)

Since Fe is in excess, we can assume that all the water vapor reacts to form \(Fe_3O_4\) and \(H_2\). Therefore, the number of moles of \(Fe_3O_4\) produced is equal to the number of moles of \(H_2O\) consumed:

\(n(Fe_3O_4) = n(H_2O) * (1 mol Fe_3O_4/4 mol H_2O) \\= 0.840 mol * (1/4) \\= 0.210 mol\)

Finally, we can use the molar mass of \(Fe_3O_4\) to convert the number of moles to grams:

\(m(Fe_3O_4) = n(Fe_3O_4) * M(Fe_3O_4)\)

where \(M(Fe_3O_4)\) is the molar mass of \(Fe_3O_4\):

\(M(Fe_3O_4) = 3 * M(Fe) + 4 * M(O) = 3 * 55.845 g/mol + 4 * 15.999 g/mol \\= 231.532 g/mol\)

\(m(Fe_3O_4) = 0.210 mol * 231.532 g/mol = 48.64 g\)

Therefore, approximately 48.64 grams of iron(III) oxide will be produced.

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The amount of oxygen that are produced when 1.06 grams of potassium chlorate decompose completely is 0.64 grams.

Relation between the mass and moles of any substance will be represented as:

Moles of potassium chlorate = 1.66g / 122.5g/mol = 0.0135mole

Given chemical reaction is:

2KClO₃ → 2KCl + 3O₂

From the stoichiometry of the reaction, it is clear that:

2 moles of KClO₃ = produces 3 moles of O₂

0.0135 moles of KClO₃ = produces (3/2)(0.0135)=0.02 moles of O₂

Mass of oxygen = (0.02mol)(32g/mol) = 0.64 g

Hence produced mass of oxygen is 0.64 grams.

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The balanced molecular equation for the reaction between sodium hydroxide (NaOH) and aluminum chloride (\(AlCl_3\)) in aqueous solution can be written as follows: 2NaOH(aq) + 3\(AlCl_3\)(aq) → 3NaCl(aq) + \(Al(OH)_3\)(s)

In this reaction, sodium hydroxide (NaOH) reacts with aluminum chloride (\(AlCl_3\)) to form sodium chloride (NaCl) and aluminum hydroxide (\(Al(OH)_3\)). The coefficients in the balanced equation indicate the stoichiometric ratio between the reactants and products.

The physical states of the substances are indicated by the symbols (aq) for aqueous solutions and (s) for the solid precipitate.

The reaction is a double-displacement reaction, also known as a precipitation reaction. Double-displacement reactions involve the exchange of ions between two compounds, resulting in the formation of a precipitate.

In this case, sodium hydroxide and aluminum chloride react to form sodium chloride and aluminum hydroxide, with aluminum hydroxide being the white solid precipitate.

It's worth noting that the actual reaction might involve hydrated forms of the compounds, such as NaOH·x\(H_2O\) and \(AlCl_3\)·y\(H_2O\). However, for simplicity, these hydrated forms are not included in the balanced equation.

Overall, the balanced equation represents the chemical reaction between sodium hydroxide and aluminum chloride, showing the reactants, products, and their stoichiometric ratios.

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One mole of radiant energy will supply 6.02 x 10^23 photons.

The number of photons is calculated by dividing the overall energy of a pulse by the energy of one photon included inside the pulse.

As a result, an electromagnetic energy particle is known as a photon. Photons have no mass, thus they move at the same rate as light.

we need to first calculate the total energy in one mole of photons,

By combining the energy per photon with Avogadro's number (6.022 x 1023), one may determine the energy of a mole of photons:

Energy per mole of photons = Energy per photon x Avogadro's number

we can calculate the energy per mole of photons:

Energy per mole of photons = 3.37 × 10−19 J x 6.022 x 10^23

Energy per mole of photons = 2.03 x 10^5 J/mol

Number of photons in one mole = Energy per mole of photons / Energy per photon

Number of photons in one mole = 2.03 x 10^5 J/mol / 3.37 × 10−19 J

Number of photons in one mole = 6.02 x 10^23 photons/mol

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The calculated formula masses to 133.5 amu, we find that the substance with a formula mass closest to 133.5 amu is (d) AlCl3. Therefore, the answer is option D.

To identify the substance with a formula mass of 133.5 amu, we need to calculate the formula mass of each given substance and compare it to 133.5 amu.

(a) MgCl2:

The formula mass of MgCl2 can be calculated by adding the atomic masses of magnesium (Mg) and chlorine (Cl).

Mg: atomic mass = 24.31 amu

Cl: atomic mass = 35.45 amu

Formula mass of MgCl2 = (24.31 amu) + 2(35.45 amu) = 95.21 amu

(b) SCl:

The formula mass of SCl can be calculated by adding the atomic masses of sulfur (S) and chlorine (Cl).

S: atomic mass = 32.07 amu

Cl: atomic mass = 35.45 amu

Formula mass of SCl = 32.07 amu + 35.45 amu = 67.52 amu

(c) BCl:

The formula mass of BCl can be calculated by adding the atomic mass of boron (B) and chlorine (Cl).

B: atomic mass = 10.81 amu

Cl: atomic mass = 35.45 amu

Formula mass of BCl = 10.81 amu + 35.45 amu = 46.26 amu

(d) AlCl3:

The formula mass of AlCl3 can be calculated by adding the atomic mass of aluminum (Al) and 3 times the atomic mass of chlorine (Cl).

Al: atomic mass = 26.98 amu

Cl: atomic mass = 35.45 amu

Formula mass of AlCl3 = 26.98 amu + 3(35.45 amu) = 133.78 amu. Option D

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The statement which interpret the object motion is the object moves with a constant positive velocity and then stops moving. The slope represents velocity. Therefore, option B is correct.

The term velocity is defined as vector expression representing the change in position over time of an object or particle. It is also known as speed.The unit of velocity magnitude is the meter per second (m/s).

A positive velocity merely indicates that an object is moving in the coordinate system's positive direction, whereas a negative velocity denotes that the item is going in the opposite direction.

Thus, option B is correct.

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it is already balanced

REACTANTS

Barium sulfide (BaS) + platinum (Ii) fluoride

PRODUCT

Barium fluoride (BaF2) + Cooperite (PtS)

Hope this answer helps you dear! take care

The equilibrium constant, K, is \(8.24\) with 3 sig figs.

A mole of naturally occurring potassium has a mass of\(39.098 grams\)

The equilibrium constant, K, for the reaction

BaCl2 (aq) + K2SO4 (aq) → BaSO4 (s) + 2KCl (aq)

can be calculated using the following equation:

K = \(\frac{[BaSO4]*[2KCl]}{[BaCl2]*[K2SO4]}\)

K = \(\frac{3.71 mol/L * (2*4.65 mol/L)}{(2.78 mol/L * 3.25 mol/L)}\)

K =\(8.24\)

Using the values provided, we can determine that K = 8.24.

Thus, the equilibrium constant, K, is 8.24 with 3 sig figs.

This is because a mole of potassium atoms is made up of 39.098 grams of K-39 atoms, 20.042 grams of K-20 atoms and 0.950 grams of K-41 atoms. The atomic number of all potassium isotopes is 19, which means they all have 19 protons. The number of neutrons in each isotope differs. K-39 has 20 neutrons, K-20 has 18 neutrons and K-41 has 22 neutrons. K-39 is the most abundant potassium isotope, making up 93.2581% of naturally occurring potassium.

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complete question:

For the reaction below, the amounts at equilibrium in a 1.0 L container at a certain temperature are: 2.78 moles BaCl2, 3.25 moles K2SO4, 3.71 moles BaSO4, and 4.65 moles KCl. What is the equilibrium constant, K? Enter your answer with 3 sig figs.

BaCl2 (aq) + K2SO4 (aq) ----> BaSO4 (s) + 2KCl (aq)

On Earth, naturally occurring potassium contains 3 isotopes:

39K, 20K, and 41K.Select ALL of the following that are true for a sample of naturally occurring potassium.

a.A mole of naturaly occurring potassium has a mass of 39.098 grams  K-41 has 41 electrons

b.All of the potassium isotopes have more neutrons than protons

c.All potassium isotopes have an atomic number of 19 K−39 is the most abundant potassium isotope

d.A mole of K-39 atoms has a mass of 39.098 grams

Potassium 41 has 19 protons and 22 neutrons

Answer:

2

Explanation:

Scientists engage in peer reviews to avoid bias, Science is a blend of logic and innovation and Scientific ideas are not durable and cannot adjust to change as new data is collected. The correct options are 1,2, and 7.  

Peer reviews are used by scientists to ensure objectivity and reduce prejudice in their study. To create original ideas and hypotheses, scientists need both logical reasoning and creative thinking.

As scientists frequently interact, exchange ideas, and build on one another's work, it is a complex social endeavour. Understanding and making sense of the natural world is the central tenet of science.

Finally, scientists separate their personal beliefs from empirical evidence in order to stay as objective as possible in their research.

Thus, Scientists engage in peer reviews to avoid bias, Science is a blend of logic and innovation and Scientific ideas are not durable and cannot adjust to change as new data is collected. The correct options are 1,2, and 7.  

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Answer:

1.58x10^5km

9.782x10^-6

Explanation:

Please Brainlist

Answer:

n = 0.0088

Explanation:

Molar mass of N2 = 2 x 14 = 28

Moles = mass/molar mass

n = 0.247/28

n = 0.0088...

The number of moles of Nitrogen in 0.247g of Nitrous Oxide is 0.01122 moles.

The question is asking about the quantification of moles of 'N' in a given amount of Nitrous oxide (N2O). The Molar mass of Nitrous oxide (N2O) is approx 44.01 g/mole, and the molar mass of Nitrogen (N) is approx. 14.01 g/mole. Hence, there are 2 moles of N in a single mole of N2O as depicted by the molecular formula. Therefore, first we calculate the number of moles of N2O by the formula: moles = mass/molar mass. Using the given mass (0.247g), moles of N2O = 0.247/44.01 = 0.00561 moles. As there are 2 moles of N in every mole of N2O, the moles of N in 0.247g N2O = 2 * 0.00561 = 0.01122 moles.

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The number of mole of CaCO₃ in antacid tablet containing 0.512 g of CaCO₃ is 5.12×10⁻³ mole

The mole of a substance is related to it's mass and molar mass according to the following equation:

Mole = mass / molar mass

From the question given above, the following data were obtained:

The number of mole in 0.512 g of CaCO₃ can be obtained as follow:

Mole = mass / molar mass

Mole of CaCO₃ = 0.512 / 100

Mole of CaCO₃ = 5.12×10⁻³ mole

Thus, 5.12×10⁻³ mole of CaCO₃ is present in the antacid tablet

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The "Ring of Responsibility" requires a 15- to 25-foot untreated buffer zone next to water bodies.

A buffer zone is an area of land that separates two or more countries, states, or territories, and is often demilitarized. The purpose of a buffer zone is to provide a space for negotiations and to reduce the possibility of conflict and war. Buffer zones can also be used to protect sensitive natural resources or habitats, such as areas of wilderness or wildlife. Buffer zones can be permanent or temporary, and can range in size from a few miles to hundreds of miles. In addition to physical barriers, buffer zones can also include economic, political, and social measures to reduce tensions between two or more parties. Buffer zones are an important tool in international relations, as they can help to prevent armed conflict and promote peaceful resolution of disputes.

This buffer zone is intended to prevent pollutants from entering the water body and protect it from potential environmental damage.

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Answer:

The reaction rate or rate of reaction is the speed at which a chemical reaction takes place. Reaction rate is defined as the speed at which reactants are converted into products. Reaction rates can vary dramatically.

Explanation:

PLS MAKE ME AS BRAINLIST

Netiquette is the acting or the behavior to communicate on the internet or online. Thus, option D is accurate.

The behavior or the manners of good conduct on the internet platforms and social media exhibited by a person is the online etiquette.

The word netiquette is a combination of the word internet and etiquette, which means the manner or conduct on online or internet platforms.

Therefore, option D. rules and manners to behave online is the correct meaning of netiquette.

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The mass of 0.550 mol of methanol, CH3OH, is 17.6 g

To find the mass of 0.550 mol of methanol, CH3OH, we need to use the molar mass of CH3OH. The molar mass is the sum of the atomic masses of each element in the molecule, which can be found on the periodic table.
For CH3OH, we have:

- Carbon (C): 12.01 g/mol
- Hydrogen (H): 1.01 g/mol (there are 4 hydrogen atoms in CH3OH)
- Oxygen (O): 16.00 g/mol

So the molar mass of CH3OH is:

12.01 g/mol + (1.01 g/mol x 4) + 16.00 g/mol = 32.04 g/mol

This means that one mole of CH3OH weighs 32.04 grams.

To find the mass of 0.550 mol of CH3OH, we can use the following formula:

mass = number of moles x molar mass

So the mass of 0.550 mol of CH3OH is:

0.550 mol x 32.04 g/mol = 17.62 g

Rounding this to three significant figures gives us:
17.6 g

Therefore, the mass of 0.550 mol of methanol, CH3OH, is 17.6 g (rounded to three significant figures).

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Answer:

kclo2

Explanation:

the percentage can't be written on the equation

\(\huge\underline\mathcal{\red{A}\blue{n}\pink{s}\purple{w}\orange{e}\green{r} -}\)

We know that ,

\(Molarity \: (M) = \frac{no. \: of \: moles \: of \: solute }{volme \: of \: solution} \\\)

it can be seen that we aren't provided with the no. of moles of solute in the question.

So let's calculate it using the given formula ~

\(no. \: of \: moles \: of \: solute = \frac{given \: mass}{molar \: mass} \\ \\ \longrightarrow \: \frac{50}{36.5} \\ \\ \longrightarrow \: 1.37 \: moles \: ( \: approx \: )\)

Also ,

we're given that volume of solution = 500 mL = 0.5 L

Substituting the values in the formula of molarity , we get

\(Molarity = \frac{1.37}{0.5} \\ \\ \bold{\implies \: \boxed{Molarity = 2.74M}}\)

hope helpful ~

Answer:

B) decay at a constant rate

Explanation:

Over their lifetime, the radioactive elements tend to have constant rate of decay. This is seen in chemistry in Kinetics, where we see that radioactive elements follow first order kinetics where the rate at which they decay is constant (no matter what concentration we have)

Answer:

B) decay at a constant rate

Explanation:

just took the test