An atom has a mass number of 43 and an
atomic number of 23. How many protons
does it have?

Answer:

iron, it is more dense than aluminum

Explanation:

Answer:

Aluminium

Explanation:

Answer:

Two young school mates talk you vivo en miami the answer is Dónde vives tú

Explanation:

The number of molecules in 8.00 moles of H2S is approximately 4.818 x 10^24 molecules.

To calculate the number of molecules in 8.00 moles of H2S, we can use Avogadro's number. Avogadro's number is a constant that represents the number of particles (atoms, molecules, ions) in one mole of a substance. It is approximately 6.022 x 10^23 molecules per mole.

To find the number of molecules, we can multiply the number of moles by Avogadro's number:

Number of molecules = Number of moles x Avogadro's number

Substituting the given values:

Number of molecules = 8.00 moles x 6.022 x 10^23 molecules per mole

Calculating the result:

Number of molecules = 4.818 x 10^24 molecules

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There are approximately 4.818 × 10^24 molecules in 8.00 moles of H2S.

To calculate the number of molecules in 8.00 moles of H2S (hydrogen sulfide), we can use Avogadro's number, which states that one mole of any substance contains 6.022 × 10^23 entities (atoms, molecules, ions, etc.).

Given that we have 8.00 moles of H2S, we can use the relationship:

Number of molecules = Moles of substance × Avogadro's number

Number of molecules = 8.00 moles × (6.022 × 10^23 molecules/mole)

Number of molecules = 4.818 × 10^24 molecules

Therefore, there are approximately 4.818 × 10^24 molecules in 8.00 moles of H2S.

This value represents the vast number of molecules present in 8.00 moles of H2S. Avogadro's number allows us to make calculations at the molecular level and understand the immense scale of the microscopic world.

The concept of Avogadro's number is fundamental in chemistry, enabling us to bridge the gap between macroscopic and microscopic properties of matter.

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Answer:

[Ar] 3d10 4s2 4p4

Explanation:

1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4

The entropy change is 6.051 x 10^4 J/K

Given:

mass of water = 10 kg

latent heat of boiling = 2257 kj

constant temperature = 100°c

To Find:

entropy change of 10 kg of water

Solution:

entropy change = mass*latent heat of boiling/temperature

= 10×2257×1000/(273+100) K

= 22,570,000/373K = 6.051 x 10^4 J/K

Hence, entropy change is 6.051 x 10^4 J/K

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Calcium carbide is actually CaC₂, not Ca₂C. While it may seem logical that the formula should be Ca₂C to balance the charges, the correct formula is CaC₂.

In CaC₂, the calcium ion (Ca²⁺) has a +2 charge, and the carbide ion (C₂²⁻) has a -2 charge. Therefore, the overall compound is neutral.

The reason why it's not Ca₂C is because that compound doesn't exist. If we try to form Ca₂C, we would need two calcium ions (2 x Ca²⁺ = +4 charge) to balance the charge of the carbide ion (C²⁻ = -2 charge), which would result in a net charge of +2. Therefore, Ca₂C cannot form as a stable compound.

I hope that clears up your confusion!

The correct order of reactivity towards electrophilic aromatic substitution is:

b.) Phenol > benzene > chlorobenzene > benzoic acid

Phenol is more reactive than benzene towards electrophilic substitution reactions due to the presence of the -OH group (hydroxyl group) attached to the benzene ring. The lone pair of electrons on the oxygen atom in the -OH group can donate electron density to the ring, making it more nucleophilic and facilitating electrophilic attack.

Benzene, although less reactive than phenol, can still undergo electrophilic substitution reactions due to its aromaticity and delocalized electron system.

Chlorobenzene is less reactive than both phenol and benzene because the chlorine atom is an electron-withdrawing group. It withdraws electron density from the benzene ring, making it less nucleophilic and less prone to electrophilic substitution.

Benzoic acid is the least reactive among the options given. The carboxylic acid group (-COOH) is an even stronger electron-withdrawing group than the chlorine atom in chlorobenzene. It further reduces the electron density on the benzene ring, decreasing its reactivity towards electrophilic substitution.

Therefore, the correct order of reactivity towards electrophilic substitution is option b.

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the complete question is:

The correct order of reactivity towards electrophilic aromatic substitution is?

a.) Benzene > phenol > benzoic acid > chlorobenzene

b.) Phenol > benzene > chlorobenzene > benzoic acid

c.) Chlorobenzene > benzoic acid > phenol > benzene

d.) Benzoic acid > chlorobenzene > benzene > phenol

A LOAEL is defined as the lowest dose that demonstrates a significant increase in an observable adverse effect. The term LOAEL stands for "Lowest Observed Adverse Effect Level."

When testing chemicals and other substances for toxicity, the goal is to determine the concentration or dose at which adverse effects begin to appear. The LOAEL is the lowest dose at which an adverse effect is observed. This value can be used to establish a safe level of exposure to a substance.
To determine the LOAEL, a series of tests are conducted in which different doses of the substance being tested are administered to test animals. The animals are observed for any adverse effects, such as changes in behavior, weight loss, or organ damage. The lowest dose at which an adverse effect is observed is the LOAEL.
It is important to note that the LOAEL is a relative measure of toxicity. It only provides information on the dose at which an adverse effect is first observed and not on the severity of the effect. In addition, the LOAEL may vary depending on the species tested and other factors.
In summary, the LOAEL is the lowest dose at which an observable adverse effect is detected. This value is used to establish a safe level of exposure to a substance.

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Answer:

HCl acts as an excess reagent

Explanation:

The reaction equation is;

PbO + 2HCl → PbCl2 + H20

Number of moles of PbO = 13g/223.2 g/mol = 0.058 moles

Since the mole ratio is 1:1, 0.058 moles of PbCl2 is produced

Number of moles of HCl = 6.4 g/36.5g/mol = 0.175 moles

2 moles of HCl yields 1 mole of PbCl2

0.175 moles yields 0.175 moles * 1/2

= 0.0875 moles of PbCl2

Hence; PbO yields the least number of moles of product so it is the limiting reactant and HCl is the reactant in excess

The function of Y would be to keep oxygen-rich blood and oxygen-poor blood separate. The last option is the correct one.

Y is the septum

The septum is a structure of the heart that separates the left atrium from the right atrium as well as the two ventricles.

Thus, the structure prevents oxygenated blood from mixing with deoxygenated blood.

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According to the given statement The solubility product Ksp of the salt at 25 °c is 6.31 x 10–6 .

The equilibrium characteristic for the dissolution of a solid into an aqueous solution is known as the solubility product constant, abbreviated KSP or the Product In a particular. It is represented by Ksp. The solubility product, a sort of equilibrium variable, varies in value with temperature.

Since 1.0 mol of the solid salt creates 1.0 mol of A+3 ion (cation) after dissolving in water, 0.022 mols of the salt will result in 0.022 mols of A+3 (direct proportion). [A+3] = 0.022 mols/liter, or 0.022 M, follows.

On the other hand, 3 mols of the B- anion will be produced from 1 mol of the solid salt. As a result, also by direct proportion, 3 x 0.022 = 0.066 mol of B- will be produced from 0.022 mols of the solid salt. Consequently, [B-] = 0.066 M

The Solubility Product, Ksp will finally be:

Ksp = [A+] [B– ]^3 = [0.022] [0.066]^3

So, Ksp = 6.31 x 10–6

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The average temperature is 17.0 °C.

The physical concept of temperature indicates in numerical form how hot or cold something is. A thermometer is used to determine temperature.

Thermometers are calibrated using a variety of temperature scales, which historically defined distinct reference points and thermometric substances. The most popular scales are the Celsius scale, sometimes known as centigrade, with the unit symbol °C, the Fahrenheit scale (°F), and the Kelvin scale (K), with the latter being mostly used for scientific purposes. One of the International System of Units' (SI) seven base units is the kelvin law of cosines.

The lowest point on the thermodynamic temperature scale is absolute zero, or zero kelvin, or 273.15 °C.

To find the average temperature, we add up the individual temperatures and divide by the total number of measurements. Let's calculate:

Average temperature = (16.9 + 17.0 + 17.1) / 3 = 51.0 / 3 = 17.0

Therefore, the average temperature is 17.0 °C.

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The energy built up in the earth could have caused a tectonic plates movement. The movement could have made a tsunami and moved the boat. The impact could have caused the boat to move up to the top of a building.

Answer:

For the decay of iodine 131, we have 53131 I→ M+ZX+ −10 e So the equation is

Explanation:

Answer:

210 grams

Explanation:

just add them all up

Answer:

342. 15 g/mol is the mass

Al Aluminium 26.98g 2 atoms per mole = 15.7716%

S Sulfur 32.06g 3 atoms per mole = 28.1151%

O Oxygen 15.99g 12 atoms per mole = 56.1133%

Explanation:

Hope this helps

Answer:

15,7%

Explanation:

What is the percentage of Aluminum in Aluminum Sulfate?

Aluminum Sulfate

is Al2 (SO4)3

its molar mass is

(2 X 27) + (3 X 96) = 54 + 288 = 344

THE % Al IS (54 /344) X 100 = 15,7%

Answer:

well im sorry to say this but good luck >:}

Explanation:

Answer:

17.1L

Explanation:

use ideal gas law

PV=nRT

101.325x = 0.7 x 8.314 x 298.15

^
Solve for x

X = 17.12424525 ~~ 17.1L

Answer:

17.11 L

Explanation:

The molar volume of a gas at room temperature (25°C) and pressure (1 atm) is 24.45 L/mol.

0.1 mole of propane reacts with oxygen to form 0.1 x 3 = 0.3 mole of carbon dioxide and 0.1 x 4 = 0.4 mole of water vapor.

The total volume of the gaseous products is 0.3 + 0.4 = 0.7 mole of gas.

Therefore, the volume of gaseous products obtained from the complete combustion of 0.1 mole of propane is 0.7 x 24.45 L/mol = 17.11 L.

The theoretical yield of Fe2(SO4)3 if 20.00 g of FePO4 reacts with an excess of Na2SO4 is 26.52g.

A chemical equation is an expression that represent the chemical reaction between two or more substances. It consists of the chemical formulas of the reactants in and the products along with the physics state of the reactants and the products solid liquid gas etc. And the symbol that denoted the type of reaction that is talking please I'll eat you double arrow of the film visible reaction the number of the atoms of each element in the reactants and products must be the same on the both side of the equation.

1) Chemical equation:

2FePO4 + 3Na2SO4 → Fe2(SO4)3 + 2Na3PO4

2) Theoretical molarity ratios:

2 mol FePO4 : 3 mol Na2SO4 : 1 mol Fe2(SO4)3 : 2 mol Na3PO4

3) Convert 20.00 g of FePO4 into number of moles

number of moles = mass in grams / molar mass

molar mass of FePO4 = 150.82 g/mol

numer of moles = 20.00 g / 150.82 g/mol = 0.1326 mol FePO4

4) Proportionality

1 mol Fe2(SO4)3                x
----------------------- =  ------------------------
2 mol FePO4           0.1326 mol FePO4

Solve for x:

x = (0.1326 / 2) * 1 mol Fe2(SO4)3 = 0.0663 mol Fe2(SO4)3

5) Convert 0.0663 mol Fe2(SO4)3 into grams

mass in grams = number of moles * molar mass

molar mass Fe2(SO4)3 = 399.88 g/mol

mass = 0.0663 mol * 399.88 g/mol = 26.51 g

Depending on the numbers of the decimal to digits used by one or otherwise you might obtained 26.52 instead 26.51, that's differences does not count.

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Given a sample of three unknown solids, we would be able to deduce which are ionic solids by their melting and boiling points, conductivity in water, and the insulation they provide.

Therefore, we can find the ionic solids amongst the samples by testing their melting and boiling points, conductivity in water, and the insulation they provide, given that each of these should provide high values to indicate an ionic solid.

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combustion reaction for the complete combustion of each molecule is C9H16 + 12.5O2 → 9CO2 + 8H2O, C10H20 + 15O2 → 10CO2 + 10H2O, and C8H20 + 12.5O2 → 8CO2 + 10H2O.

To balance the combustion reactions, we need to ensure that the number of atoms of each element is the same on both sides of the equation.

Combustion of C9H16:

C9H16 + O2 → CO2 + H2O

To balance the carbon atoms, we need 9 CO2 molecules on the product side. To balance the hydrogen atoms, we need 8 H2O molecules on the product side. Finally, to balance the oxygen atoms, we calculate the total number of oxygen atoms present in the reactant and product:

Reactant: 1 O2 molecule = 2 oxygen atoms

Product: 9 CO2 molecules + 8 H2O molecules = 9 * 2 + 8 * 1 = 26 oxygen atoms

Therefore, we need 12.5 O2 molecules as the coefficient for O2 to balance the oxygen atoms. The balanced equation is:

C9H16 + 12.5O2 → 9CO2 + 8H2O

Combustion of C10H20:

C10H20 + O2 → CO2 + H2O

Following the same process as above, we determine that the balanced equation is:

C10H20 + 15O2 → 10CO2 + 10H2O

Combustion of C8H20:

C8H20 + O2 → CO2 + H2O

The balanced equation for this combustion reaction is:

C8H20 + 12.5O2 → 8CO2 + 10H2O

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Answer:

The mass of products is 207kg

Explanation:

To solve this question we can do mass balance assuming the engine that contains the gasoline produce only carbon dioxide and water, that is:

Mass of reactants = Mass of products

Where mass of reactants is mass of gasoline  + Mass oxygen = 207kg

That means the combined mass of products is 207kg

Answer:

33 minutes

Explanation:

60 km/h = 37.28 mi/h

20/37.28 = 0.5364 h

0.5364 * 60 min = 32.2 minutes

Answer: Ionic attractions

Explanation:

Ionic bonding is a type of chemical bond that involves the electrostatic attraction between oppositely charged ions.

If the gases are at the same temperature and pressure, the ratio of their effusion rates is directly proportional to the ratio of the square roots of their molar masses:

This states that the rate of diffusion of a gas is inversely proportional to the square root of the molar mass i.e

R ∝ 1/ √M

R₁/R₂ = √(M₂/M₁)

Where

From the Graham's law equation, we can see that the ratio of the rates of effusion of the two gases is directly proportional to the square root of their molar masses

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Answer:

Alchemy is based on mystic view of reality whereas chemistry is based on experiments, observations and facts.

Chlorobenzene can be converted into benzoic acid using Grignard reagent. Thus, treating with Mg metal in dry ether followed by carboxylation and then hydrolyising the product gives benzoic acid.

Grignard reagents are alkyl magnesium halides with the general formula RMgX. They can be prepared by treating alkyl halides with Mg metal in presence of dry ether.

Chlorobenzene when treated with Mg gives MgCl substituted benzene ring which upon carboxylation using carbon dioxide followed by hydrolysis gives benzoic acid.

Therefore, the reagents needed for the conversion of chlorobenzene to benzoic acid are Mg, CO₂ and water.

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