An unknown gas has a density of 0.862 g/l at 298 k and 2.14 atm. what is the molar mass of the gas?

This largely depends on the solubility and polarity of the substance that needs to be recrystallized.

When a substance needs to be recrystallized, the ideal solvent system for the process will not dissolve it at all at low temperatures, it will dissolve it completely at the solvent's boiling point, and the impurities will be dissolved at all temperatures. While both hexane and diethyl ether are considered non-polar solvents, diethyl ether is more polar than hexane so the combination of the two (depending on the ratio) might have all the required properties. It is, however, more common to use a more polar solvent in combination with hexane, such as ethyl acetate.

You can learn more about the solvents here:
brainly.com/question/14797683

#SPJ4

Answer:

A. dust

Explanation:

Complete combustion of 8.00 g of a hydrocarbon produced 25.7 g of CO₂. The empirical formula for the hydrocarbon is C₄H₇.

The empirical formula of the molecule is the simplest whole number of atoms of a compound.

Moles of C in the compound:  27.8 g CO2 x 1 mol CO2/44 g x 1 mol C/mole CO2 = 0.632 moles of C

Moles of H in the compound:  9.96 g H2O x 1 mol H2O/18 g x 2 mol H/mol H2O = 1.11 moles of H

mass C = 0.632 mol C x 12 g/mol = 7.58 g C

mass H = 1.11 mol H x 1 g/mol = 1.11 g H

Sum = 8.69 g total mass (close enough to 8.70 so our assumption of no oxygen is correct)

To find the lowest whole number of moles, we can divide both by the lowest value (0.632) to obtain.

moles C = 0.632/0.632 = 1.0

moles H = 1.11/0.632 = 1.75

Now to get a whole number for H we can multiply both by 4 to obtain

moles C = 4

moles H = 7

Thus, the Empirical formula is C₄H₇.

To learn more about the Empirical formula, refer to the below link:

https://brainly.com/question/14044066

#SPJ1

API assigns a default value of Hs/D = 0.5 and an assumption of αR = αS , resulting in the  32.7 35.2 42.1 50.6 59.6 67.2 70.3 69.2 62.6 51.1 41.2 34.5.

Communication between two or more computer applications is made possible via application programming interfaces (APIs). It is a kind of software interface that provides a service to other software. An API specification is a document or a standard that outlines how to create or use a connection or interface of this type. The term "implement" or "expose" refers to a computer system that conforms to this standard. A specification or an implementation may both be referred to as an API.

An application programming interface, as opposed to a user interface, links computer systems to people, while a user interface does the opposite.

To learn more about API  from the given link:

https://brainly.com/question/12987441

#SPJ4

A 483 L balloon at 42° C is heated to 81° C the balloon's final volume is 604.17.

Volume-temperature (constant pressure) When pressure is constant, the volume of a gas is directly proportional to its temperature. Volume to temperature ratio is constant when pressure stays constant. Charles' law or Gay-law Lussac's are two names for this relationship.

A thermodynamic process known as an isochoric process, also known as a constant-volume process, isovolumetric process, or isometric process, occurs when the volume of a closed system going through the process stays constant.

According to Charles law:

V1/T1 = V2/T2

initial temperature = 42⁰ C

42⁰ C+273 = 315 k

Final temperature = 81⁰ C

81⁰+273 = 354 k

V1/T1 = V2/T2

483L/315k = V2/354k

354 * 483 = 315 * V2

170982/283 = (315)V2/315

V2 = 604.17 L

To know more about Volume visit:

https://brainly.com/question/12050285

#SPJ9

Carbon with sp³-hybrid orbitals is the least electronegative.

Electronegativity (χ) is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

Atoms with higher electronegativity attracts more electrons towards it, electrons are closer to that atom.

Carbon can form chemical bonds with sp, sp² and sp³-hybrid orbitals.

The more percentage s-orbital in hybrid orbitals of carbon, the greater is the electronegativity of the carbon atom.

sp³-hybrid orbital has 25% character of s-orbital, so it is the least electronegative.

sp²-hybrid orbital has 33% character of s-orbital.

sp-hybrid orbital has 50% character of s-orbital.

More about electronegativity: brainly.com/question/24977425

#SPJ4

In a sample of dichloromethane intermolecular forces that will be present are dispersion interactions and dipole - dipole forces.

There are two kinds of Van der Waals forces: weak dispersion interactions and stronger dipole-dipole forces.

Intermolecular forces are the forces between molecules or particles.

The London dispersion force is the weakest intermolecular force.

Dispersion force is also called an induced dipole-induced dipole attraction.

The London dispersion force (intermolecular force) is a temporary attractive force between molecules.

There are several types of intermolecular forces: hydrogen bonding, ion-induced dipole forces, ion-dipole forces andvan der Waals forces.

In the molecule of dichlormethane (CH₂Cl₂) there are dipole-dipole forces between negatively charged chlorine atom from one molecule of the compound and positively charged hydrogen atom of another molecule of the compound.

Missing options: dipole-dipole interactions, hydrogen bonding, dispersion forces.

More about intermolecular forces: brainly.com/question/10752995

#SPJ4

The empirical formula of a compound is C₂H₅O.

Take 100 grams of compound:

1) ω(C) = 53.31% ÷ 100% = 0.5331

m(C) = ω(C) × m(compound).

m(C) = 0.5331 × 100 g.

m(C) = 53.31 g.

n(C) = m(C) ÷ M(C).

n(C) = 53.31 g ÷ 12 g/mol.

n(C) = 4.44 mol; amount of carbon

2) ω(H) = 11.18 % ÷ 100% = 0.1118

m(H) = 0.1118 × 100 g.

m(H) = 11.18 g.

n(H) = 11.18 g ÷ 1 g/mol.

n(H) = 11.18 mol; amount of hydrogen

3) ω(O) = 35.51 % ÷ 100%.

ω(O) = 0.3551

m(O) = 0.3551 × 100 g

m(O) = 35.51 g.

n(O) = 35.51 g ÷ 16 g/mol.

n(O) = 2.22 mol.

4) n(C) : n(H) : n(O) = 4.44 mol : 11.18 mol : 2.22 mol /2.22 mol.

n(C) : n(H) : n(O) = 2 : 5.03 : 1

More info about empirical formula: brainly.com/question/1873039

#SPJ4

To rearomatize the ring system is the driving force for losing a proton as the last step in electrophilic aromatic substitution.

An atom that is connected to an aromatic ring is replaced with an electrophile in electrophilic aromatic substitution processes. Examples of these reactions include Friedel-Crafts reactions, aromatic nitrations, and aromatic sulphonations. An electrophile displaces a functional group in a molecule, which is generally, but not always, aromatic, in an electrophilic substitution process. Aromatic compounds are known for their aromatic substitution reactions, which are frequently used to introduce functional groups into benzene rings.

To learn more about aromatic substitution:

https://brainly.com/question/28286554

#SPJ4

The use of phenyl isothiocyanate, the key reagent in the Edman degradation, makes it possible to remove and identify one amino acid at a time.

In the process of Edman degradation, Phenyl isothiocyanate is exposed by the protein, which then tends to react with the uncharged alpha-amino group present on the first amino acid which results in the formation of an intermediate molecule. The intermediate molecule of protein thus formed now contains an amino acid that is labeled.

Edman added Phenyl isothiocyanate as it creates a phenyl thiocarbamoyl derivative complex with N-terminal. Then the N-terminal is made to cleave under certain acidic conditions which are harsh, which creates a cyclic complex of phenylthiohydantoin PTH type of amino acid.

In general, it does not damage the structures of protein and then exits out two peptide constituents. This method can be again repeated for the remaining residues, which separates only one residue at a time. Thus phenyl isothiocyanate helps in the removal and identification of one particular amino acid at a time in Edman degradation.

Learn to know more about amino acids at

https://brainly.com/question/12323415

#SPJ4

Answer:

5 is the correct answer of this

Answer:

m=2.0796kgmass or 20.3938N

Explanation:

m=Fa/K

convert 50N to Kg = 50N( .10197kg/1N) cancel N = 5.0958kgf

m= 5.0958kgf(4m/s²) all over K

k= 9.8066(kgm•m/kgf•s²)

m= 5.0958kgf(4m/s²) all over 9.8066 kgm•m/kgf•s²)

m= 2.0796kgm

in Newton

m= 20.3938N..

sana tama.

The production of uric acid is advantageous to birds because uric acid is safe to store, has little toxicity, and uses little water to excrete when an embryo grows in an egg.

Uric acid is a safe, nontoxic compound that is produced by birds. It is advantageous to birds because it can be stored safely, uses little water to excrete, and is little toxic to embryos. Uric acid is produced as a waste product of purine metabolism and is typically excreted in the urine. However, in birds, uric acid is secreted in the feces. Uric acid has a number of benefits for birds. First, it is safe to store. Second, it uses little water to excrete. Third, it is little toxic to embryos. Uric acid is produced by the liver and is excreted by the kidneys. It is a waste product of purine metabolism and is typically excreted in the urine. However, in birds, uric acid is secreted in the feces. Uric acid has a number of benefits for birds. First, it is safe to store. Second, it uses little water to excrete. Third, it is little toxic to embryos.

Learn more on uric acid here:

https://brainly.com/question/13026792

#SPJ4

The molecular formula of a compound is C₂H₂O₄.

Take 100 grams of compound:

1) ω(C) = 26.7% ÷ 100% = 0.267

m(C) = ω(C) × m(compound)

m(C) = 0.267 × 100 g.

m(C) = 26.7 g.

n(C) = m(C) ÷ M(C).

n(C) = 26.7 g ÷ 12 g/mol.

n(C) = 2.22 mol; amount of carbon

2) ω(H) = 2.2 % ÷ 100% = 0.022

m(H) = 0.022 × 100 g.

m(H) = 2.2 g.

n(H) = 2.2 g ÷ 1 g/mol.

n(H) = 2.2 mol; amount of hydrogen

3) ω(O) = 71.1 % ÷ 100%.

ω(O) = 0.711

m(O) = 0.711 × 100 g

m(O) = 71.1 g

n(O) = 71.1 g ÷ 16 g/mol

n(O) = 4.4 mol; amount of oxygen

4) n(C) : n(H) : n(O) = 2.2 mol : 2.2 mol : 4.4 mol /2.2 mol.

n(C) : n(H) : n(O) = 1 : 1 : 2

M(CHO₂) = 45 amu; empirical formula

90 amu ÷ 45 amu = 2 CHO₂

More info about empirical formula: brainly.com/question/1873039

#SPJ4

Answer:

Explanation:

14.74

4.0 g mass of NaOH is required to react exactly with 25.0 ml of 2.0 m H₂SO₄ which is option (c) .

It is given that volume of solution = 25.0 ml  = 0.025L and molarity of H₂SO₄ = 2.0 M  .

Using molarity , we get

Moles of H₂SO₄ = Volume of solution × Molarity

Moles of H₂SO₄ = 0.025L × 2 = 0.05 moles

2NaOH + H₂SO₄ = Na₂SO₄ + 2H₂O

As sulphuric acid is a dibasic acid,so 2 NaOH molecules are require to neutralise 1 sulphuric acid molecule.

Hence, Moles of NaOH require = 0.05 × 2 = 0.1 mol.

Molar mass of NaOH = 40g

Mass of NaOH = mole × molar mass

                        =    0.1 × 40

                        =    4.0 g

Learn more about molarity here :

https://brainly.com/question/26873446

#SPJ4

It is a good idea to keep in mind which solvents can dissolve which solvents by saying "like dissolves like." Purely aromatic hydrocarbon cyclohexane is extremely hydrophobic and nonpolar, therefore it won't dissolve in a solvent that is highly polar or hydrophilic like water.

What is solubility?

The maximum amount of a material that may dissolve in another is known as its solubility. A saturated solution is created when a solvent can hold the most solute while still maintaining equilibrium.

The saying "like dissolves like" is a helpful reminder of which solvents can dissolve which solvents. Cyclohexane, a purely aromatic hydrocarbon, is exceedingly hydrophobic and nonpolar, therefore it won't dissolve in a highly polar or hydrophilic solvent like water.

To learn more about solubility from the given link below,

https://brainly.com/question/23946616

#SPJ4

8.22 g ca (no3) Enough water is used to dissolve 2 to create a 0.250 l solution.

The solution's molarity is 0.050/0.250 M, or 0.2 M.

How is Molar concentration is defined?

The term "molar concentration" is used to define the concentration of a chemical species, specifically a solute, in a solution. It denotes the quantity of a substance per unit volume of solution. Other synonyms for this phrase include quantity, substance concentration, and molarity.

M = n/V

where,  n = no of moles of solute

V = volume of solution

and, M = molarity of the solution.

Molecular weight of Ca(NO3)2 = 164g = 1 mole pf calcium nitrate

Thus, 8.22 g  Ca(NO3)2 = 8.22/164 moles. = 0.050 mole

Volume(given) = 0.250l

Therefore, Molarity of the given solution = 0.050/0.250 M = 0.2 M

To learn more about molar concentration from the given link below,

https://brainly.com/question/21961599

#SPJ4

Answer:

covalent bonds

Explanation:

because the electrons are shared between atoms therefore the binds are very directional

The carbon dioxide concentration in the pre-industrial atmosphere was around 280 ppm but has increased to around 400 ppm today.

Burning fossil fuels for electricity production and transportation, making cement, destroying forests, farming, and many other activities all contribute to CO2 pollution. The planet's atmosphere warms steadily as a result of the presence of CO2 and other greenhouse gases, which trap heat that would otherwise radiate from the surface and escape into space. This warming of the atmosphere triggers a variety of weather changes, such as periods of extreme heat, drought, and wildfire activity, as well as heavier precipitation, flooding, and tropical cyclone activity.

The effects of greenhouse gas pollution on the world's oceans include increasing sea surface temperatures, rising sea levels and increased carbon absorption, making seawater more acidic, deoxygenating the oceans and making it harder for some marine organisms to survive.

Hence,the CO2 concentration has increased in todays atmosphere.

LEARN MORE ABOUT GREENHOUSE EFFECT HERE:

https://brainly.com/question/19521661#:~:text=This%20is%20Expert%20Verified%20Answer&text=Greenhouse%20effect%20is%20caused%20by,heat%20within%20the%20Earth's%20atmosphere.

#SPJ4

Density is a measure of how heavy something is compared to its size. If an object is more dense than water it will sink when placed in water, and if it is less dense than water it will float. Density is a characteristic property of a substance and doesn't depend on the amount of substance.

HOPE THIS HELPS :)

The first physical test that we will do is flame test, Test the rate at which the substance catches fire.

So in flame test the white powder sample is introduced to a non-luminous, hot flame and observing the colour of the flame and observing the colour of the flame. The main concept behind the flame test is the sample atoms evaporate and since they are hot, they emit light when being in flame.

Here we are looking into the chemical change which is happening to the substance. Burning is a chemical change as new substance is formed with new properties and it cannot be reserved.

So the first physical test a forensic scientist might do is  Test the rate at which the substance catches fire.

Learn more about Flame test here https://brainly.com/question/26873482

#SPJ1

Answer: Probably why are you wearing it and why do you have it on

Explanation:

Answer:

remove it, tuck it under ur shirt

Explanation:

Amine nitrogen atom containing an electron pair and bonded to three different groups is technically a stereogenic center, the chirality of the amine nitrogen is often ignored due to its four bonds are needed to define stereoganic center.

A stereogenic center is any atom that gives different isomers when atoms or groups attached to it are exchanged. These isomers are called stereoisomers because the structures of the molecules are the same but their spatial arrangements are different from each other.

Chirality only exists with the tetrahedral carbon atoms Because there Is usually rapid inter conversion between the two isomeric forms at room temperature. Because there usually slow Inter conversion between the two Isomeric forms at room temperature.

Atom bearing groups such that interchanging of any two groups leads to a stereoisomer, plane of symmetry so that there are no stereoisomers tetrahedral atom enantiomer, non-superimposable mirror image tetrahedral atom bonded to four different substituents.

To learn more about stereogenic center, refer to below link:

https://brainly.com/question/8776482

#SPJ2

Answer:

Hope this helps :)

When a person is holding a basketball, there is potential energy, and when the ball is dropped/bounced then there is potential energy. The basketball has the highest amount of kinetic energy when it is falling and bounces on the floor.

The phosphorylation of glucose occurs first in the glycolysis process. ADP + Glucose-6-phosphate + Glucose (6C) is the product of the same process.

Describe glycolysis.

The metabolic process known as glycolysis turns the molecule glucose (C6H12O6) into pyruvate (CH3COCO2H).

The high-energy molecules adenosine triphosphate (ATP) and reduced nicotinamide adenine dinucleotide are produced using the free energy produced during this process (NADH).Glycolysis is a set of ten enzyme-catalyzed reactions. Carbohydrates' binding energy is preserved. ATP retention

Glycolysis is one metabolic pathway that doesn't require oxygen (In anaerobic conditions pyruvate is converted to lactic acid). Numerous species commonly undergo glycolysis, indicating that it is an ancient metabolic pathway.

Thus, the reaction involved in the first reaction of glycolysis is

Glucose (6Carbons) + ATP → Glucose-6-phosphate + ADP.

To learn more about glycolysis from the given link below,

https://brainly.com/question/2107186

#SPJ4

This is because while the chilled solvent is saturated and should release some crystal .

The volume of solute that can be dissolved in the solvent grows with temperature. The result becomes less soluble as the solution cools, and the solute molecules cluster to form nuclei, which are tiny stable crystals. This is the nucleation stage in the crystallization process.

Because even through the chilled solvent is saturated and  should start to crystallise , some of the desired material will still be dissolved in the chilled solvent and will be lost when the crystal and solvent are seperated.

To learn more about Recrystallisation refer

https://brainly.com/question/13349160

#SPJ4

The absolute amount of the discrepancy or simply error between the measured value and the actual value is multiplied by 100 and divided by the actual value to determine the percent error.

Follow these easy procedures to determine the error rate-

1. Don't take into consideration any minus (-) signs when calculating the inaccuracy (by deducting the predicted value from the actual value). take the error's absolute value, etc.

Approximate Value - Exact Value = Absolute Error

2. Subtract the mistake from the accurate figure (sometimes, we may get a decimal number).

3. Relative error is the difference between the precise and approximative values.

4. Add a "%" following the conversion to a percentage (by multiplying by 100).

|Approximate Value - Exact Value|/Exact Value 100% Percent Error

To know more about Error and Percent error visit:

https://brainly.com/question/4170313

#SPJ9