a 9.75 gram sample of an unknown gas occupied a volume of 4.00 l at 25 oc and a pressure of 0.980 atm. calculate its molar mass

Dehydration synthesis reactions build molecules up and generally require energy, while hydrolysis reactions break molecules down and generally release energy. Carbohydrates, proteins, and nucleic acids are built up and broken down via these types of reactions, although the monomers involved are different in each case

Answer:

Dehydration synthesis reactions build molecules up and generally require energy, while hydrolysis reactions break molecules down and generally release energy. Carbohydrates, proteins, and nucleic acids are built up and broken down via these types of reactions, although the monomers involved are different in each case.

Explanation:

Answer:

The answer  for 2-hexene is that the structure should have 6 carbon with a double bond beginning on the 2nd carbon atom.

The answer for 1-pentyne is that the structure should have 5 carbon with triple bond beginning on the 1st carbon atom.

Explanation:

2-Hexene

The structural formula for 2-hexene will have 6 carbons because the nomenclature has a -hex prefix, which stands for 6 carbons.

The -ene suffix of the nomenclature means that the organic compound is an alkene. Alkenes are hydrocarbons that contain double covalent bond and  have the suffix -ene.

The double bond is on the 2 carbon atom because the nomenclature states that the double bond will be on the 2 carbon atom.

1-Pentyne

The structure will have 5 carbons since the -pent prefix means 5 carbons.

The structure has a triple bond because the -yne suffix means that the structure is an alkyne. An alkyne is a hydrocarbon with triple covalent bonds.

Also, the position of the triple bond is known because the nomenclature of the alkyne states that the triple bond is on the 1st carbon.  

Answer:

The term HYDROCARBONS means organic compounds which contain only carbon and hydrogen. By using this definition, four classes of hydrocarbons are included: alkanes, alkenes, alkynes and aromatic.

Hydrocarbons are organic compounds composed of only carbon and hydrogen. The alkanes are saturated hydrocarbons—that is, hydrocarbons that contain only single bonds. Alkenes contain one or more carbon-carbon double bonds.

Answer:

vapourisation can occur from solid or liquid into a gas but evaporation is straight from a liquid and is often below boiling temperature while vapourisation is often above boiling temperature

Answer:

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Answer: option c an electron has a negative charge and is located outside the nucleus revolving in circular path

According to the structure of atom, an electron has a negative charge and is located outside the nucleus.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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The phosphorus atom shown below has 5 valence electrons. In order to have a stable set of valence electrons, it needs to gain 3 more electrons. This will result in the formation of a phosphide ion (P³⁻).

When a phosphorus atom gains a stable set of valence electrons, it forms an ion called a phosphide ion. The phosphorus atom achieves stability by gaining three electrons to complete its valence shell, resulting in a -3 charge. Therefore, the ion formed is P³⁻ (phosphide ion).

Phosphorus is a chemical element with the atomic number 15 and the letter P in its name. Phosphorus is an element that appears in two major forms: red and white. However, because to its strong reactivity, phosphorus is never found on Earth as a free element.

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Answer:

An object in a fluid medium displaces a set amount of fluid upon immersion. Archimedes' principle states that the weight of the displaced fluid is equal to the buoyant force exerted on the object

An object in a fluid medium displaces a set amount of fluid upon immersion. Archimedes' principle states that the weight of the displaced fluid is equal to the buoyant force exerted on the object

Answer:

56.64°c

Explanation:

its obtained from facts that heat gained by water=heat lost by calorimeter

Answer:

A. 2NaBr + Ca(OH)₂ —> CaBr₂ + 2NaOH

The coefficients are: 2, 1, 1, 2

B. 2NH₃ + H₂SO₄ —> (NH₄)₂SO₄

The coefficients are: 2, 1, 1

Explanation:

A. __NaBr + __Ca(OH)₂ —> __CaBr₂ + __NaOH

The above equation can be balance as follow:

NaBr + Ca(OH)₂ —> CaBr₂ + NaOH

There are 2 atoms of H on the left side and 1 atom on the right side. It can be balance by writing 2 before NaOH as shown below:

NaBr + Ca(OH)₂ —> CaBr₂ + 2NaOH

There are 2 atoms of Na on the right side and 1 atom on the left side. It can be balance by writing 2 before NaBr as shown below:

2NaBr + Ca(OH)₂ —> CaBr₂ + 2NaOH

Thus, the equation is balanced. The coefficients are: 2, 1, 1, 2

B. __NH₃ + __H₂SO₄ —> __(NH₄)₂SO₄

The above equation can be balance as follow:

NH₃ + H₂SO₄ —> (NH₄)₂SO₄

There are 2 atoms of N on the right side and 1 atom on the left side. It can be balance by writing 2 before NH₃ as shown below:

2NH₃ + H₂SO₄ —> (NH₄)₂SO₄

Thus, the equation is balanced. The coefficients are:

2, 1, 1

The mass of \(Ag_2CrO_4\) that would be formed will be 2.69 grams.

Mole of 2.5 grams silver nitrate = 2.5/143.32 = 0.017 mol

Mole of 18.0 mL, 0.450 M sodium chromate = 18/1000 x 0.450 = 0.0081

From the balanced equation of the reaction, the mole ratio of silver nitrate to sodium chromate is 2:1. In other words, the sodium chromate is a bit limiting.

The mole ratio of sodium chromate and  \(Ag_2CrO_4\) is 1:1. Hence, the equivalent mole of \(Ag_2CrO_4\) formed would also be 0.0081 mol.

Mass of 0.0081 mol \(Ag_2CrO_4\) = 0.0081 x 331.73

                                                 = 2.69 grams

In other words, the mass of \(Ag_2CrO_4\) formed from the reaction would be 2.68 grams.

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In mass spectrometry, the substance with a 1 charge and a mass equal to the molar mass of an organic compound is called the molecular ion or parent ion. This ion is formed by the removal of an electron from the organic compound during ionization.

The molecular ion provides information about the molecular weight of the compound and its composition. It is a crucial component of mass spectrometry analysis for identifying and characterizing organic compounds.

Mass spectrometry is a technique used to analyze the composition of organic compounds by ionizing and separating their ions based on their mass-to-charge ratio. The molecular ion represents the intact organic compound with one electron removed, providing a valuable starting point for determining the compound's molecular formula and structure.

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Answer:

Amount of oxygen react with 48 g of magnesium = 32 gram

Explanation:

Given:

Amount of oxygen react with 4.8 g of magnesium = 3.2 g

Find:

Amount of oxygen react with 48 g of magnesium

Computation:

Using Law of equal proportion;

Amount of oxygen react with 48 g of magnesium = 48(3.2/4.8)

Amount of oxygen react with 48 g of magnesium = 32 gram

Answer: D

Explanation:

Answer:

16

Explanation:

Answer:

16 hopes this will help you

Explanation:

16 hope this helps

Answer:

Volume of nitrogen needed  = 125.5 L

Volume of hydrogen needed = 84.05 L

Explanation:

Given data:

Volume of ammonia produced = 250.0 L

Volume of nitrogen needed = ?

Solution:

Chemical equation:

N₂ + 3H₂  →    2NH₃

Number of moles of ammonia:

PV = nRT

1 atm× 250.0 L = n × 0.0821 amt.L/mol.K × 273K

250.0 atm.L = n × 22.41 amt.L/mol

n = 250.0 atm.L /22.41 amt.L/mol

n = 11.2 mol

Now we will compare the moles of ammonia with nitrogen.

             NH₃          :           N₂

               2             :            1

             11.2            :         1/2×11.2 = 5.6 mol

Volume of nitrogen needed:

PV = nRT

1 atm× V  = 5.6 mol × 0.0821 amt.L/mol.K × 273K

V  = 125.5amt.L/1 atm

V = 125.5 L

2nd)

Given data:

Number of moles of ammonia produced = 2.50 mol

Volume of hydrogen needed = ?

Solution:

Chemical equation:

N₂ + 3H₂  →    2NH₃

Now we will compare the moles of ammonia and hydrogen.

                     NH₃          :          H₂

                       2            :            3

                    2.50         :           3/2×2.50 = 3.75 mol    

Volume of hydrogen:

PV = nRT

1 atm × V = 3.75 mol × 0.0821 amt.L/mol.K × 273K

V = 84.05 amt.L/1 atm

V = 84.05 L

Compression fittings used with copper or plastic tubing primarily seal  by means of a: compression ring. . The correct answer is option b.

Compression fittings are a popular choice for connecting copper or plastic tubing in various applications, including plumbing, gas lines, and hydraulics. These fittings work by creating a strong, watertight seal using a compression ring as the main sealing component.

When installing a compression fitting, the tubing is first inserted into the fitting, where it meets the compression ring. As the fitting's nut is tightened, it compresses the ring, which in turn presses against the tubing and the fitting's beveled neck. This creates a secure seal, preventing leaks and ensuring a strong connection.

Some compression fittings may also include additional sealing components, such as compressed o-rings (d) or beveled gaskets, to enhance the overall sealing performance. However, the primary sealing mechanism in most cases is the compression ring.

Therefore, option b is correct.

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a) Resonance structures showing how the aryl group of trans- anethole stabilizes the intermediate carbocation:

Carbocation (I) gets stabilized by the resonance effect of the aryl group of trans-anethole, which results in intermediate carbocation (II) shown below.

The intermediate carbocation (II) formed has a stabilized aryl group, which makes the intermediate relatively stable and more reactive than the corresponding cation of styrene or vinyl chloride.

b) Based on your results, explain any differences or similarities in the stereochemistry of the bromine addition reactions of trans-cinnamic acid and trans-anethole:

In both the cases of trans-anethole and trans-cinnamic acid, the addition of bromine takes place in a stereospecific way. In trans-anethole, addition takes place with the formation of trans-2,3-dibromoanethole, which is similar to the formation of the anti-addition of bromine in trans-cinnamic acid to form trans, trans-2,3-dibromocinnamic acid. Therefore, both the bromine addition reactions lead to the formation of the corresponding anti-isomers in high yields due to the steric factor involved in the intermediate carbocation formation.

Intermediate carbocation plays a crucial role in this reaction. In the case of trans-anethole, intermediate carbocation gets stabilized by the resonance effect of the aryl group of trans-anethole, which results in a relatively stable intermediate. On the other hand, in the case of trans-cinnamic acid, intermediate carbocation formation occurs at the more substituted carbon atom, which leads to the formation of the anti-isomer. This is because the aryl group gets stabilized by the delocalization of electrons due to its π-electron-rich nature.

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The ratio of octene to oxygen is 1:12.

To determine the ratio of octene (C8H16) to oxygen (O2) in the given reaction, we need to examine the balanced chemical equation. However, the equation you provided does not seem to be balanced. The coefficients for each compound must be determined to achieve a balanced equation before we can calculate the desired ratio.

Assuming you meant the combustion reaction of octene, a balanced equation would be:

C8H16 + 12O2 → 8CO2 + 8H2O

From the balanced equation, we can see that for every 1 mole of octene (C8H16), we require 12 moles of oxygen (O2) to completely react.

This means that for every 1 mole of octene, we need 12 moles of oxygen to fully combust the octene and produce the corresponding amounts of carbon dioxide (CO2) and water (H2O) as shown in the balanced equation.

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The final temperature of the water resulting from the mixing of 100 mL of 30°C water with 500 mL of 60°C water would be 55°C.

In order to calculate the final temperature of a mixture of two different temperatures of water, we can use the following formula:

\(T_{(final)} = (m_1T_1 + m_2T_2) / (m_1 + m_2)\)

where:

In this case, we have 100 mL of 30°C water and 500 mL of 60°C water. We can convert mL to grams using the density of water which is approximately 1 g/mL2. Therefore:

m1 = 100 g T1 = 30°C m2 = 500 g T2 = 60°C

Thus:

Therefore, the final temperature of the mixture is 55°C.

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The atom that moves at its rms velocity at 100°C with a wavelength of 2.31 * 10 m is : SULPHUR ( s )

To determine the atom we will have to determine the molar mass of the atom

Applying De Broglie equation

λ = h / mv

Vrms = \(\sqrt{\frac{3RT}{M} }\)  ---- ( 1 )

Where : λ  = 2.31 * 10⁻¹¹,  R = 8.314 J / k.mol,  T = 373 K, h = 6.626 * 10⁻³⁴ J.s

From equation ( 1 )

M = ( h² Ua ) / 3RT*λ² --- ( 2 )

where : Ua ( mass of an atom ) = 6.022 * 10²³,  h = 6.626 * 10⁻³⁴,  R = 8.314 J / k.mol, λ  = 2.31 * 10⁻¹¹,    T = 373 K

Insert values into equation ( 2 )

M ( molar mass ) = 32 g/mol

Sulphur has a molar mass of 32 g/mol therefore the atom is sulphur.

Hence we can conclude that The atom that moves at its rms velocity at 100°C with a wavelength of 2.31 * 10 m is : SULPHUR ( s ).

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Answer:

where is the answers??

Explanation:

topsoil

subsoil

bedrock

Answer:

Sand , Clay , Slit

Explanation:

I just know

Simultaneous causality can cause the endogeneity problem. This statement is true and it can be stated as follows:

To address this problem, researchers often use instrumental variable techniques or conduct a suitable econometric analysis that accounts for endogeneity.

Endogeneity refers to the situation where the relationship between two variables is affected by a third variable that is not accounted for in the analysis.

Simultaneous causality occurs when two or more variables simultaneously influence each other. In this case, the relationship between the variables is not one-directional, making it difficult to establish a clear cause-and-effect relationship.

This can lead to endogeneity because the presence of simultaneous causality violates the assumption of exogeneity, which assumes that the explanatory variables are not affected by the error term in the regression model.

As a result, the estimated coefficients may be biased and inconsistent.

To address this problem, researchers often use instrumental variable techniques or conduct a suitable econometric analysis that accounts for endogeneity.

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The oxidation of co (carbon monoxide) to less-harmful co₂ (carbon dioxide) and the oxidation of hc (unburned hydrocarbons) to co₂ (carbon dioxide) and h₂o (water).

Oxidation is that the loss of electrons during a reaction by a molecule, atom or ion. Oxidation occurs when the oxidation number of a molecule, atom or ion is increased. the other process is called reduction, which occurs when there's a gain of electrons or the oxidation state of an atom, molecule, or ion decreases.

The term oxidation was first employed by Antoine Lavoisier to signify the reaction of a substance with oxygen. Much later, it had been realized that the substance, upon being oxidized, loses electrons, and therefore the meaning was extended to include other reactions in which electrons are lost, no matter whether oxygen was involved.

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Answer  its most likely going to be b. but it could also be d.

Explanation:

25 is the total number of orbitals which can be present in the fifth energy level of an atom .

What are orbitals ?

In orbital, chemistry and physics, a mathematical term called a wavefunction that describes the properties of two or fewer electrons near a nucleus or nuclear system, such as a molecule. An orbital is often represented as the 3-dimensional region where an electron has a 95% chance of being found.

Understand the concept of different eye socket shapes and sizes.

Atomic orbitals are usually denoted by a combination of numbers and letters (eg, 1s, 2p, 3d, 4f) that represent certain properties of the electron associated with the orbital. The numbers, the so-called principal quantum numbers, indicate the energy levels and their relative distances from the nucleus.

l=0 to l=(n−1) . For each of the orbital states we have a different number of total orbitals which is increasing as the azimuthal number increases. Hence, the total number of orbitals in the fifth energy level is 25.

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Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\\)

From the question we have

\(density = \frac{23.73}{3.0} \\ \)

We have the final answer as

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