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How many atoms of sulfur are in a 2.500 mole sample of pure sulfur? *
O 1.505 x 10 24
O 5.69 x 10-24
O 110.
O 1.20 x 1024

The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of the reactant and product is conserved. Therefore the mass of oxygen reacted is 6gram.

According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier. Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved.

Fe[tex]_3[/tex]O[tex]_4[/tex]+ FeO +oxygen [tex]\rightarrow[/tex]  Fe[tex]_2[/tex]O[tex]_3[/tex]

Mass of Fe[tex]_3[/tex]O[tex]_4[/tex]+ FeO =1.237  Grams

Mass of  Fe[tex]_2[/tex]O[tex]_3[/tex]= 7.237  grams

According to law of conservation f mass

Mass of Fe[tex]_3[/tex]O[tex]_4[/tex]+ FeO + mass of oxygen = Mass of  Fe[tex]_2[/tex]O[tex]_3[/tex]

Substituting the values we get

1.237+ mass of oxygen   = 7.237

mass of oxygen  =6gram

Therefore the mass of oxygen reacted is 6gram.

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HCl(aq) + NaOH (aq) ⇒ H2O (l) +NaCl (aq)   [ titration ]

H+ + OH ⇒ H2O (l)

A titration is a method for figuring out all the concentration of the solution by using a solution with known concentration. Until the reaction is finished, the titrant (the known solution) is typically added from the a buret to a known volume of the analyzer (the unknown solution).

A burette, which is basically a long, graduated measurement rod with such a stopcock and a distribution tube at its bottom end, is used to gradually administer a standard solution of titrant reagent, or titrant, to a specified concentration.

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The given atmospheric pressure in different units is equal to:

0.732 atm = 10.75 psi

0.732 atm = 74.2 kPa

0.732 atm = 7.41 ×10⁴ Pa

0.732 atm = 556.32 mmHg

0.732 atm = 21.9 Hg

Atmospheric pressure can be defined as the pressure within the atmosphere of Earth. The standard atmosphere is expressed as a symbol atm and is equal to a unit of pressure 101,325 Pa.

The atm unit can be described as equivalent to the sea-level atmospheric pressure on Earth and is equal to 1 atm.

Given, the 1 atm is equal to = 14.69 psi

Then 0.732 atm will be equal to = 14.69 × 0.732 = 10.75 psi

the 1 atm is equal to = 101.3 kPa  

Then 0.732 atm will be equal to =  101.3 kPa  × 0.732 = 74.2 kPa

the 1 atm is equal to = 1.013×10⁵ Pa

Then 0.732 atm will be equal to =1.013×10⁵ Pa× 0.732 = 7.41 ×10⁴ Pa

1 atm is equal to = 760 mmHg

Then 0.732 atm will be equal to = 760 × 0.732 =  556.32 mmHg

1 atm is equal to = 29.92 Hg

Then 0.732 atm will be equal to = 29.92 × 0.732 = 21.9 Hg

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The term 100% shut off means: gas burner and regulator is shut off gas to a pilot and the manifold is shut off.

The 100% shutoff system is the system where where the failure in the flame device system take place and the in both the the pilot valve and the main gas valve are shut off . the complete shut off means that the pilot should shut off for any reason, the gas valve will not allow any gas to flow either that is to the main burner or to the pilot burner thus is means the 100% shutoff system

Thus, the 100% shutoff system means the failure in the flame proving device.

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You're wanting to figure out the molar mass of H2O2, which tells you the mass of one mole of this compound. There are 2 hydrogen (H) atoms and 2 oxygen (O) atoms in one molecule of H2O2, so you have to add the masses of these 4 atoms.

Different elements have different molar masses. When you look at hydrogen (H) on a periodic table (if you looked up "periodic table" and hover over H with your cursor), there will be a number, 1, that shows how many protons an atom of hydrogen has, and there will be another number (that's relevant to this problem), 1.0078 (or rounded to 1.008), that shows the mass of an atom of that element. Looking on a periodic table, hydrogen has a molar mass of 1.008 and oxygen has a molar mass of 15.999.

To figure out the molar mass of H2O2, you add two hydrogen atoms, which each have a mass of 1.008, with two oxygen atoms, which each have a mass of 15.999.

2 (1.008) + 2 (15.999) = molar mass of H2O2

The yield of aluminum oxide is 47g

What is aluminum ?

Chemical element aluminium (Al), also written aluminium, belongs to the major Group 13 (IIIa, or boron group) of the periodic table. It is a light, silvery white metal. The most common nonferrous metal and the most plentiful metallic element in the crust of the Earth is aluminium.

What is oxygen ?

Chemical elements are substances that only contain one sort of atom, such as oxygen. An oxygen atom contains eight protons in its nucleus, as indicated by its atomic number of 8 and official chemical symbol, O. At room temperature, oxygen is a gas that is flavorless, odorless, and colorless.

We first need to write down a balanced equation for the reaction:

4Al+3O2→2Al2O3

Now, we determine the number of moles of aluminum: 25.0g27.0g/mol=0.93mol

We know that 4 moles of Al react with 3 moles of O2, so the mole ratio is 4:3. This means we need (3/4)*0.93 mol= 0.69 mol of O2. If we multiply this by the molar mass of O2 (32 g/mol), we get 22.2 g of oxygen needed.

We know that for every 4 moles of Al, there will be formed 2 moles of Al2O3, so the mole ratio is 2:1. This means we will get 0.46 moles of Al2O3. Multiply by the molar mass of Al2O3 (102 g/mol), and we get 47 g.

Therefore, the yield of aluminum oxide is 47g.

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Answer:

rfjc I N E NUMBER ++78+47+97+38+06--+78+47+97+38-06--I N E

Answer: The water becomes more acidic

Explanation:

Since the average ph of water is 7 and vinegar is an acidic substance with a ph ranging from 2-3. When it is added to water which is also a neutral substance, the water becomes more acidic.

The students average speed of the student is 3.5 km/h.

Speed is known to be calculated as the ratio of distance traveled and time traveled. It is a scalar quantity since it only has magnitude and not direction. Velocity is the percentage of time an object moves along a path, and Velocity is expressed as the rate and direction of an object's movement.

The mathematical calculation of speed is relatively simple, calculating the average velocity of an object by dividing the distance traveled by the time it took the object to travel that distance. Velocity, on the other hand, is mathematically complex and can be calculated in different ways depending on what information is available about the object's motion.

Speed = Distance/Time

Speed = 7km/2h

Speed = 3.5 km/h

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Answer:

N2O5 + H2O => 2HNO3

Explanation:

N2O5 + H2O => 2HNO3

N = 2

O = 6

H = 2

I hope this helps.

The sodium concentration in normal saline solution in mM is 154.1 millimoles.

What is molarity?

Molarity (M) is calculated by dividing the volume of the solution (V) in liters by the number of moles of solute (n). Not moles of solute per liter of solvent, but rather moles of solute per liter of solution, is an important distinction to remember when defining molarity.

Molarity = no of moles /volume in liter

[tex]Number of moles = given weight /molecular weight[/tex]

1000 ml = 1 liter

Molarity = (9/58.4)/ 1

=0.1541M = 154.1 mM

Number of moles = 0.1541

= 154.1 millimoles

Therefore, the sodium concentration in normal saline solution in mM is 154.1 millimoles.

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The enthalpy of reaction for the given reaction is -1172 KJ. The formation enthalpy of oxygen is zero. Option D is correct.

Enthalpy change of a reaction is the change in  heat energy absorbed or released from a reaction. The change in enthalpy of a reaction is the difference of sun of change in enthalpies of the products and sum of change in enthalpies of the reactants.

Here, the reaction enthalpy can be written as:

ΔH(rxn) = [(6 ΔHf (H₂O) + (4 ΔHf (NO)] -  [(4 ΔHf (NH3) + (5 ΔHf (O₂)].

The formation enthalpy of molecular oxygen in its standard state is 0.

Thus, ΔH(rxn) = [(6 × (-286 ) + (4 × 90) kJ/mol ] -  [(4 × (-46 kJ/mol) ]

                       = -1172 kJ.

Therefore, the reaction enthalpy for the given reaction is - 1172 kJ.

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Covalent bonds are formed when two or more atoms (often...) share electrons. Better (more stable) than larger formal charges are smaller ones.

The electron geometry is the foundation for hybridization. Observe the VSEPR Table to ascertain the hydridization of a molecule's core atom. How do sp3 orbitals come into being? The combination of one s and three p orbitals results in four sp3 orbitals.

When a molecule's geometry shows how bond pairs and lone pairs are arranged around the central atom as well as the coordination number of the molecule. The lone pairs around the central atom.

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The best way to sum up the cyclist's potential and kinetic energy is to say that as she progresses up the hill, her kinetic energy rises and her potential energy falls.

The object or system is unaffected by external factors like air pressure or altitude. On the other hand, kinetic energy refers to the force of moving particles within a system or an object.

Kinetic energy is the energy a thing has as a result of motion. A force must be applied to an object in order to accelerate it.We have to work hard in order to apply a force. Once the work is finished, energy is transferred to the item, at which point it moves at a new, constant speed.

Potential energy is the energy that an object or system has stored as a result of its placement or configuration. An object's kinetic energy is measured in relation to stationary and moving items in its immediate environment. Potential energy is independent of an object's surroundings.

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Answer:

Don't make a bomb hahaha, anyway here's your guide

Explanation:

There are several ways to make a chemical change to water, which is a molecule made up of two hydrogen atoms and one oxygen atom (H2O). Some examples of chemical changes that can be made to water include:

It's important to note that these chemical changes to water involve the formation of new chemical compounds, which is a hallmark of a chemical change. Physical changes, on the other hand, do not involve the formation of new compounds, but rather a change in the physical properties of a substance, such as its size, shape, or state of matter.

If you have any question let me know and a thnks & brainiest wouldnt hurt

The concentration of potassium permanganate solution is 0.015 mM.

Use the equation given below to calculate the molarity of solution,

Mili molarity of the solution = [Mili moles of solute × 1000]/[Volume of solution in mL]

Given,

Moles of the solute = 4.6 × 10⁻³ mmol

Volume of the solution = 300 mL

Substituting the values we get,

Mili molarity of the solution = [Mili moles of solute × 1000]/[Volume of solution in mL]

Mili molarity of the solution = [4.6 × 10⁻³ × 1000]/300 = 0.015 mM

Hence the mili molarity of the solution of potassium permanganate is 0.015 mM.

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The osmotic pressure of a 0.431 M solution of sodium phosphate in water is equal to 44.25 atm.

The osmotic pressure of a solution can be defined as the minimum pressure that needs to be applied to a solution to prevent the flow of the solvent across a semipermeable membrane. The determination of the tendency of a solution to take in a solvent by osmosis is called osmotic pressure.

To determine the osmotic pressure of the solution the concentration of the compound can be determined.

π = i × CRT

Given the concentration of the solution, C = 0.431 M

The temperature, T = 40.0 °C = 40 + 273 = 313 K

The value of the gas constant, R = 0.08206 L･atm/K･mol

The number of ions on the dissociation of sodium phosphate, i = 4

The osmotic pressure of the solution of sodium phosphate is:

π = 4× 0.431 × 0.082 ×313

π = 44.25 atm

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The following are correct about the endpoint of a titration

a)The amount of analyte equals the amount of titrant added.

b)The solution will change from colorless to a faint pink color that lasts 30 seconds or so.

d)The amount of analyte is half the amount of titrant added.

e)The solution will change from colorless to bright pink.

The endpoint of a titration is the point at which the reaction between the reactants is complete, resulting in the formation of a precipitate, color change, or another measurable indicator. The endpoint is typically determined by an indicator, a compound that changes color at a certain pH.

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In order to prepare amide bonds, dicyclohexylcarbodiimide (DCC) was first used as a coupling reagent by Sheehan and Hess in 1955.

Since then, DCC has been employed for peptide synthesis. An O-acylisourea active intermediate plays a role in the creation and propagation of an amide or peptide bond in this process. It would be difficult to overestimate the significance of the typical carboxylic acid reaction with dicyclohexylcarbodiimide (DCC) and amines to produce amides in the synthesis of peptides, especially in the solid phase (Scheme 1). Dicyclohexylcarbodiimide, sometimes known as DCC, is a dehydrating agent typically employed in the laboratory to manufacture proteins. It removes a water molecule from the amino acids involved in the creation of the peptide bond and forms a suitable leaving group.

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Dmitri Mendeleev and Lothar Meyer independently developed the periodic law in 1869. Mendeleev developed the first periodic table, which was quickly followed by Meyer.

The periodic table, also known as the periodic table of the elements, is an arrangement of chemical elements in rows and columns. It is widely used in chemistry, physics, and other sciences, and is widely regarded as a chemistry icon.

Meyer is best known for his contribution to the periodic table of elements. He observed, as did John A. R. Newlands in England, that arranging the elements in the order of their atomic weights resulted in groups of similar chemical and physical properties repeated at regular intervals.

Thus, Mendeleev developed the first periodic table, which was quickly followed by Meyer.

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If 24.65 mL of 1.12 M NaOH are needed to completely react with the acetic acid  then 0.0275072 mol  of NaOH is present in the sample.

Acetic Acid is the colorless acidic and organic compound with the organic formula of CH3COOH.It has a Molar mass of 60.052 g/mol.

Used as :

As per the given data i.e. :

Volume of NaOH= 24.65 mL=0.02456L

Molarity (M) of NaOH= 1.12 M

The reaction taking place is :

NaOH + CH3COOH →CH3COONa+ H2O

Now to find the no. of moles in NaOH =

moles in NaOH = V in L * M

moles in NaOH= 0.02456 L * 1.12 M

moles in NaOH= 0.0275072 mol

Hence 0.0275072 mol  of NaOH is present in the sample.

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0.0275072 mol of sodium hydroxide are present in the sample if 24.65 mL of 1.12 M NaOH are required to thoroughly react with the acetic acid.

Acetic acid: what is it?

Acetic acid is an organic, colorless molecule with the chemical formula CH3COOH.

Its molecular weight is 60.052 g/mol.

Uses:

used for

Preservative for food

food supplement

for the production of insecticides, dyes, and photographic chemicals.

Solution:

Given the information, namely:

NaOH volume: 24.65 mL (0.02456 litres).

NaOH has a molarity (M) of 1.12 M.

The following reaction is occurring:

CH3COONa + H2O = NaOH + CH3COOH

How many moles are there in NaOH?

NaOH moles = V in L * M

moles = 0.02456 L * 1.12 M in NaOH

mol in NaOH = 0.0275072 mol

There is therefore 0.0275072 mol of NaOH in the sample.

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substituted twice.In the arrow, the reactants are on the left and the products are on the right.

The dissolution of the metal in hydrochloric acid results in the production of aluminum chloride and colorless hydrogen gas.Because the finished products do not interact, this reaction cannot be stopped.Hydrochloric acid reacts with metallic aluminum to produce an oxidation-reduction process.

Aluminum chloride (AlCl3) is the product of almost all reactions between hydrochloric acid and aluminum (or its derivatives).Water and organic solvents like nitrobenzene, dichloroethane, and acetone work well to dissolve the salt.

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By the use of the scientific notation, the results in miles per year is 8.8 * 10^6 mi/yr.

We know that the scientific notation has to do with the expression of a number in such a way that the umber would take up the least space. In this case we have to recall that we need to use the exponents to reduce the bulk of the figures that we would have needed to write.

Given that we have been asked to express the result or the quotient in the unit of miles per year while we take cognizance of the significant figures, we can write;

4.6 x10^5 mi/5.2 x10^-2 yr

= 8.8 * 10^6 mi/yr

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Answer: Matthias Schleiden helped to establish Cell theory that concluded all plant tissues are made of cells and embryonic plant arose from a single cell. Whereas Theodor Schwann told that both animals are made up of cells and these cells have independent lives.

Explanation:

In 1838, Matthias Schleiden, a German botanist, concluded that all plant tissues are composed of cells and that an embryonic plant arose from a single cell. He declared that the cell is the basic building block of all plant matter. This statement of Schleiden was the first generalizations concerning cells.

This statement of Schleiden was the first generalizations concerning cells. Schleiden investigated plants microscopically and conceived that plants were made up of recognizable units, or cells. He thought plant growth came about through the production of new cells, which, he speculated, came from the nuclei of old cells. Although later discoveries proved him wrong about the role of the nucleus in mitosis, his conception of the cell as the common structural unit of plants shifted study from to processes going on in a living cell.

Schwann concluded three things that became vital components of the cell theory. First, Schwann concluded that both plants and animals were composed of cells. Second, these cells have independent lives. Third, these independent lives are subject to the organism's life.

The cell is the basic unit of life. This statement was the second generalization concerning cells and is the most important in the development of biology.

It became known as the cell theory.

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There would be 0.0781 mol of N2 at 0.3 atm pressure and 30 °C.

By multiplying or dividing, one can utilize Avogadro's number to convert between molecules and moles: To convert from moles to molecules, multiply the number of moles by 6.02 x 1023. To convert the amount of molecules to moles, multiply it by 6.02 x 1023.

The molar volume of a gas is 22.414 L/mol at STP, which is defined as 0°C (273.15 K, 32°F) and 1 atm.

Calculate the moles of nitrogen in 1.75 L at STP using dimensional analysis.

1.75 L N2 divided by 1 mole per 22.414 L equals 0.0781 mol N2 to three 2 digits.

6.02214076 x 1023 of any chemical unit, such as atoms, molecules, ions, and others, constitute a mole. The mole is a useful measure to employ because any substance is made up of a lot of atoms, molecules, or other parts.

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Rate=k[NO]2[O2]  of the following is the rate law for the overall reaction that is consistent with the proposed mechanism.

A simple set of reactions known as elementary steps or elementary reactions illustrate the progression of a reaction now at molecular level. The series of simple steps that together make up a full chemical reaction is known as a reaction mechanism.

A reaction that requires two or more basic stages is considered to be multistep or complex. An intermediary is a chemical creature that is created in one basic stage of either a reaction and eliminated in the following. In a reaction system, the step that moves the slowest is the rate-determining step.

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Naming of compounds and ions are listed below:

1. Ba²⁺ : Barium cation

2. I³⁻ : Triiodide ion

3. Ti²⁺ : Titanium cation

4. Rn : Radon

5. Ba: Barium

6. Cl₂ : Chlorine

7. SO₄²⁻ : Sulphate ion

8. SO₄ : Sulphate ion

9. (NH₄)₂S : Ammonium sulphate

10. KClO₃ : Potassium chlorate

11. CaCO₃ : Calcium carbonate

12. Ga(CN)₃ : Gallium(III) Cyanide

13. S₂O₄ : Dithionite

14. C₃F₆ : Hexafluorocyclopropane

15. K₂SO₃ : Potassium sulfite

16. Sn₃(PO₄)₂ : Tin(II) phosphate.

All substances are either molecular or ionic. A molecular compound is made up of molecules whose chemical composition reflects the amount of atoms that are really bound together in the molecule. The bond lengths and angles between the atoms' bonds together give the compound a distinct form.

Ionic bonds are the result of strong electrostatic interaction between nearby cations and anions. Sodium chloride, also known as table salt or NaCl, is the most typical kind of ionic substance. Ionic compounds do not have molecules, in contrast to covalent compounds.

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CH3MgBr is a  reagents that can be used to accomplish the following transformation.

When primary alcohol is oxidised with a mild oxidising agent, it produces aldehyde, and when oxidised with a strong oxidising agent, it continues to oxidise.

carnosic acid Secondary alcolin does not undergo oxidation with oxidising agents gure ketone and textiary alcohol due to a lack of replaceble H bonded to carbon.

What is the name of ch3mgbr?

Methylmagnesium bromide.

When Grignard reagent CH3MgBr is treated with water we get?

Grignard reagent is not water stable and interacts with it. The interaction of methylmagnesium bromide (CH3MgBr) with water (H2O) produces methane (CH4) and MgBr (OH). This reaction efficiently hydrolyzes water to generate products.

Hence CH3MgBr  is a correct answer.

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