HELPPPPP
54.5 g of Ca(NO3)2 was used to create a 1.5 M solution. What is the volume of the solution in ml?

Answer:

a)

For Methylcyclohexane  N₁ = 2770

For Methylcyclohexene N₂ = 2827

For Toluene N₃ = 2557

b) the standard deviation for the average in (a) is 143.31

c)

For Methylcyclohexane; H₁ = 0.01444 cm

For Methylcyclohexene; H₂ = 0.01415 cm

For Toluene; H₃ = 0.01564 cm

Explanation:

Given the data in the question;

Gas-liquid chromatography on a 40-cm packed column:

Compound                   tR, min                           W, min

Air                                   1.9                                    —

Methylcyclohexane      10.0                               0.76

Methylcyclohexene      10.9                               0.82

Toluene                        13.4                                1.06

a)

an average number of plates from the data;

To get the Number of plates N, we use the following expression;

N = 16( tR / W )², we use it for Methylcyclohexane, Methylcyclohexene and Toluene

-

For Methylcyclohexane  N₁ = 16( 10 / 0.76 )² = 16( 173.13 ) = 2770.08 ≈ 2770

-

For Methylcyclohexene N₂ = 16( 10.9 / 0.82 )² = 16( 176.7 ) = 2827.2 ≈ 2827

-

For Toluene N₃ = 16( 13.4 / 1.06 )² = 16( 159.8078 ) = 2556.9 ≈ 2557

b) standard deviation for the average in (a).

First we get the mean;

Mean N" = ( N₁ + N₂ + N₃ ) / 3 = ( 2770 + 2827 + 2557 ) / 3 = 8154 / 3 = 2718

Next we determine the deviation

d₁² = (N₁ - N")² = (2770 - 2718)² = (52)² = 2704

d₂² = (N₂ - N")² = (2827 - 2718)² = (109)² = 11881

d₃² = (N₃ - N")² = (2557 - 2718)² = (-161)² = 25,921

∴ ∑d²\(_i\) = 40506

Standard Deviation S = √( ∑d²\(_i\)  / ( n-1 ) )

Standard Deviation S = √( 40506 / ( 3-1 )

Standard Deviation S = √( 40506 / 2 )

Standard Deviation S = √( 20253 )

Standard Deviation S = 143.31

Therefore, the standard deviation for the average in (a) is 143.31

c)

an average plate height for the column

Given that; Gas-liquid chromatography on a 40-cm packed column, L = 40 cm

-

For Methylcyclohexane; H₁ = L/N₁ = 40 / 2770 = 0.01444 cm

-

For Methylcyclohexene; H₂ = L/N₂ = 40 / 2827  = 0.01415 cm

-

For Toluene; H₃ = L/N₃ = 40 / 2557 = 0.01564 cm

Answer:

fossil fuels are exhaustible, available in limited quantity, takes a long time to replenish & is found under the earth.

Since crude oil satisfies all these conditions, it is a fossil fuel.

Answer:

N₂H₆

Explanation:

A 1.000 g sample of nitrogen combined with a 0.0720 g sample of hydrogen to form N₂H₂ .

1.000 g of nitrogen combines with 0.2160 g of hydrogen in the next compound .

In this compound the component of nitrogen remains the same but the component of hydrogen becomes .2160 / .0720 = 3 times .

Hence component of hydrogen in the new compound will change from

H2 to H6 .

Hence the chemical formula of new compound will be

N₂H₆ .

Answer:

compared to sodium, silicon has a higher ionization energy meaning it takes more energy to remove electrons.

Explanation:

hope this helps

can u please give me and Brainlist

The atomic mass of Aluminum is 23, which means it has a total of 23 particles in its nucleus, including protons and neutrons.

Aluminum has an atomic number of 13, which means it has 13 protons in its nucleus.

To find the number of neutrons, we subtract the atomic number from the atomic mass. So, Aluminum has 23 - 13 = 10 neutrons in its nucleus. Electrons are the negatively charged particles that orbit around the nucleus of an atom.

Aluminum, being a neutral atom, has an equal number of electrons to the number of protons in its nucleus, which is 13. These electrons are distributed in different energy levels or shells around the nucleus.

Aluminum is a widely used metal in different applications due to its unique properties such as low density, high strength, and resistance to corrosion. It is used in the manufacturing of cans, foils, and aircraft parts. The number of protons and electrons determines the atomic number and chemical properties of an element. The number of neutrons affects the stability and isotopes of an element.

for more questions on atomic

https://brainly.com/question/30390726

#SPJ11

1.25 moles of \(CO_{2}\) are required to react with 2.50 moles of \(NH_{3}\).

What are the moles?

Moles are a unit of measurement used in chemistry to express the amount of a substance. One mole of a substance is equal to its molecular weight expressed in grams. In other words, one mole of a substance contains 6.022 x \(10^{23}\) individual particles (atoms, molecules, or ions). The number of moles of a substance can be calculated by dividing its mass in grams by its molecular weight or by using the ideal gas law PV=nRT, where n is the number of moles.

The balanced chemical equation is:

\(2NH_{3}\)(g) + \(CO_{2}\)(g) → \((NH_{2})_{2}CO\)(aq) + \(H_{2}O\)(l)

From the balanced equation, we can see that 1 mole of \(CO_{2}\) reacts with 2 moles of \(NH_{3}\).

Therefore, to determine the moles of \(CO_{2}\) required to react with 2.50 moles of \(NH_{3}\), we need to use the mole ratio from the balanced equation:

2 \(NH_{3}\) : 1 \(CO_{2}\)

2.50 moles \(NH_{3}\) * (1 mole \(CO_{2}\) / 2 moles \(NH_{3}\)) = 1.25 moles \(CO_{2}\)

Therefore, 1.25 moles of \(CO_{2}\) are required to react with 2.50 moles of \(NH_{3}\).

What is molecular weight ?

Molecular weight, also known as molar mass, is the mass of one mole of a substance. It is expressed in units of grams per mole (g/mol). The molecular weight of a compound is determined by adding up the atomic weights of all the atoms in the molecule.

What is substance?

In chemistry, a substance is a form of matter that has constant chemical composition and characteristic properties. It may be an element or a compound made up of two or more elements chemically combined in a fixed proportion. Examples of substances include pure water, carbon dioxide gas, and sodium chloride (table salt).

To know more about moles, visit:

https://brainly.com/question/13623076

#SPJ1

250 L of 5.0% w/v glucose solution can be prepared using 125 g of glucose.

w/v = [ mass of solute (g) / volume of solution (mL) ] × 100

5.0 % w/v = [ 125 g / volume of solution (mL) ] × 100

volume of solution (mL) = [ 125 g / 5.0 % w/v ] x 100

volume of solution (mL) = [ 125 g / (5.0 / 100) ] x 100

volume of solution (mL) = [ 125 g / 0.05 ] x 100

Answer: 20.9 billion years.

Explanation: To estimate the age of the rock, we can use the fact that the half-life of uranium-238 is 4.47 billion years. This means that half of the uranium-238 in the rock would have decayed into lead-206 after 4.47 billion years, and half of what remains would decay in the next 4.47 billion years, and so on.

If 20% of the uranium-238 in the rock has decayed into lead-206, then 80% of the original uranium-238 is still present in the rock. This means that the rock has gone through one half-life of uranium-238 decay, and we can estimate its age by using the graph on page 253.

According to the graph, the ratio of lead-206 to uranium-238 after one half-life is approximately 0.027. This means that the rock contains 0.027 times as much uranium-238 as it did originally, and the remaining 80% of the uranium-238 corresponds to 0.8 times the original amount.

Therefore, we can estimate the original amount of uranium-238 in the rock as follows:

Original amount of uranium-238 = (0.8) / 0.027 = 29.63 times the current amount

Next, we can use the fact that each half-life corresponds to a reduction in the amount of uranium-238 by a factor of 2, to estimate the number of half-lives that have passed since the rock formed:

Number of half-lives = log2(29.63) = 4.88

Finally, we can estimate the age of the rock as follows:

Age of the rock = (4.88) x (4.47 billion years per half-life) = 20.9 billion years

Therefore, we can estimate that the age of the rock is approximately 20.9 billion years.

Answer:

\(\boxed {\boxed {\sf D. \ 0.25 \ M}}\)

Explanation:

Molarity is a measure of concentration in moles per liter.

\(molarity= \frac{moles \ of \ solute}{ liters \ of \ solution}\)

The solution contains 0.75 moles of sodium chloride and has a volume of 3.0 liters.

Substitute these values into the formula.

\(molarity= \frac{ 0.75 \ mol \ NaCl}{3.0 \ L}\)

\(molarity= 0.25 \ mol \ NaCl/L\)

Molarity has the molar (M) as its unit. 1 molar is equal to 1 mole per liter.

\(molarity= 0.25 \ M \\)

The molarity of the solution is 0.25 Molar and Choice D is correct.

Answer:

c

Antoine Lavoisier

Explanation:

Romans 15:13    May the God of hope fill you with all joy and peace as you trust in him, so that you may overflow with hope by the power of the Holy Spirit.

Christ be with you✝

give brainly to top dude

The final temperature of the copper would be 30.26°C if it absorbed 150 J of heat.

To solve this problem, we can use the formula:

q = m * C * deltaT

where q is the heat absorbed by the copper, m is the mass of the copper, C is the heat capacity of copper, and deltaT is the change in temperature.

Rearranging the formula, we get:

deltaT = q / (m * C)

Substituting the given values, we get:

deltaT = 150 J / (75 g * 0.38 J/g°C) = 5.26 °C

Therefore, the final temperature of the copper will be:

25.0°C + 5.26°C = 30.26 °C

Learn more about heat capacity, here:

https://brainly.com/question/28302909

#SPJ1

Vomiting, headaches, wooziness, blurred vision, and even liver injury are side effects of vitamin A. Vitamin D - Tiredness, headache, sickness, and vomiting. Vitamin C: Heartburn, diarrhea, vomiting, and nausea.

Yes, excessive amounts of some types of vitamin A can be dangerous. A strong headache, blurred vision, nausea, dizziness, muscular aches, and issues with coordination can result from taking too much preformed vitamin A, which is typically found in supplements or some medications.

Poisonous Substance. Any component in a multivitamin supplement can be toxic in large doses, but iron or calcium pose the biggest threat. Large or toxic doses of calcium, vitamin D, and vitamin A carry additional dangers.

To know more about toxicity visit:-

https://brainly.com/question/21891087

#SPJ1

The answer responses to  the structures shown in the diagram are:

A. chromosomes

C. They would be the same.

B. They are in pairs because each one comes from a different parent.

The chromosomes are in pairs because humans have a diploid number of chromosomes, meaning they have two sets of chromosomes, one inherited from each parent.

The nucleus is important in eukaryotic cells and has many important parts that help the cell work properly. There are some parts inside cells called the nuclear membrane, nucleoplasm, nucleolus, and chromatin. Chromatin is made up of DNA and other proteins.

Every part of a person's body has the same genes, but the way they are organized can be different in different types of cells. The chromosomes in our skin cells might not be the same as the chromosomes in our muscle cells, even if they come from the same person.

Learn more about  nucleus from

https://brainly.com/question/9376695

#SPJ1

Identify the structures shown.

A. chromosomes

B. mitochondria

C. nuclei

D. vacuoles

C

Describe how the structures from this cell would compare to the structures in the nucleus of another body cell from the same person.

A. There would be longer.

B. They would be shorter.

C. They would be the same.

D. They would be different.

Describe how the structures from this cell would compare to the structures in the nucleus of another body cell from the same person.

A. There would be longer.

B. They would be shorter.

C. They would be the same.

D. They would be different.

Explain why the structures are in pairs.

A. They aren't in pairs.

B. They are in pairs because each one comes from a different parent.

C. This cell is making a copy of itself.

D. The cell always has 2 copies in case 1 is damaged.

According to the VSEPR theory, a molecule or ion of CO2 will have a flat linear shape. Option A

In CO2, the carbon atom forms double bonds with each oxygen atom. The carbon-oxygen double bonds consist of two pairs of electrons, which are arranged linearly, leading to a linear molecular shape.

The VSEPR theory suggests that electron pairs in the valence shell of the central atom repel each other and try to position themselves as far apart as possible, resulting in the linear shape.

The VSEPR theory allows us to predict the molecular geometry based on the arrangement of bonding and non-bonding electron pairs around the central atom. In the case of CO2, there are no lone pairs of electrons on the carbon atom, and the molecule has a symmetrical arrangement, leading to a linear shape. Option A

For more such questions on VSEPR theory visit:

https://brainly.com/question/14225705

#SPJ8

Answer:

The answer is the second one

Answer:

solusoin ( 0.0130 )²

Explanation:

The Pi product of the numbers 2, 3 and 10 will be 2 times 3 times 10:

It means that the correct answer is 60.

The possible combinations are;

1) n = 5, l = 2, ml = 0, ms = -1/2

2) n = 3, l = 1, ml = -1, ms = +1/2

We know that quantum numbers are used to show the position of the electron in an atom. The quantum number shows us the position or the place that we could be able to locate a particular electron that is under study. Recall that the region in space where there is a high probability of finding the electron is called the orbital.

The following are the possible combinations of quantum numbers for a given electron;

1) n = 5, l = 2, ml = 0, ms = -1/2

2) n = 3, l = 1, ml = -1, ms = +1/2

Learn  more about quantum numbers:https://brainly.com/question/16977590

#SPJ1

Answer:

18 significant figures all figures are significant

Answer:I dont know about this one

Explanation:

Jonathon's experiment produced 24.5 grams of Al(OH), which is less than the predicted amount of 26.0 grams of AKOH. The discrepancy could be due to measurement errors, incomplete reaction.

What is discrepancy?

To determine the cause of the discrepancy, Jonathon should first review his experimental procedure and make sure that all measurements and calculations were performed accurately. He should also check that the reactants were mixed thoroughly and that the reaction was allowed to proceed to completion. If any errors or inconsistencies are identified, Jonathon should correct them and repeat the experiment to obtain more accurate results.

If the experimental procedure was carried out correctly and the discrepancy cannot be attributed to measurement errors, Jonathon should consider the possibility of impurities in the reactants. Even small amounts of impurities can affect the outcome of a chemical reaction, so it is important to use high-quality, pure chemicals in experiments whenever possible.

Overall, the most important thing for Jonathon to do in this situation is to carefully review his experimental data and methodology, and to identify any potential sources of error or uncertainty. By doing so, he can improve the accuracy and reliability of his results and draw more meaningful conclusions from his experiment.

To know more about reactants, visit:

https://brainly.com/question/13005466

#SPJ9

STEP-BY-STEP EXPLANATION

Sodium chloride (NaCl) exists in a solid state cause it possesses a high melting point. NaCl has a strong force attraction between sodium ion and chloride ion and this invole the transferring of electrons from sodium to chloride. Therefore, sodium chloride exists in the solid state.

The products of the alpha decay of radium-226 and the beta decay of carbon-14 are radon-222 and nitrogen-14, respectively.

The alpha decay of radium-226 results in the emission of an alpha particle, which is a helium nucleus consisting of two protons and two neutrons.

Therefore, the product of the alpha decay of radium-226 is radon-222:

Ra-226 → Rn-222 + alpha particle

On the other hand, In the case of carbon-14, beta minus decay occurs, in which a neutron is converted into a proton, and an electron and an antineutrino are emitted.

So carbon-14 becomes nitrogen-14:

C-14 → N-14 + beta particle

To know more about alpha decay, here

brainly.com/question/27870937

#SPJ1

--The complete Question is, What is the product of the alpha decay of radium-226 and the beta decay of carbon-14?--

Answer:

\(m_{Fe}=4.02x10^{2}gFe\)

Explanation:

Hello!

In this case, since the mole-mass relationships allows us to compute the moles or mass of a sample given the mass or moles via the atomic (elements) or molar mass (compounds). For iron, whose atomic mass is 55.847 g/mol, we can compute the mass o 7.20 moles as shown below:

\(m_{Fe}=7.20molFe*\frac{55.847gFe}{1molFe}\\\\m_{Fe}=4.02x10^{2}gFe\)

As you can see we write 1 mol Fe on bottom in order to cancel the given moles out.

Best regards!

The approximate degree of dissociation of a 0.35 M solution of lactic acid is 4,87%

The degree of dissociation is the quantity used to express the strength of a base, that is, its ability to conduct electric current, which depends on the amount of ions released in the dissociation.

The degree of dissociation (α) is another way of determining the strength of a base. It indicates the fatty acids that were released from a base when it dissociates in water.

With that being said, C stands for concentration and α is the the degree of dissociation.

Latic Acid can be written as  C3H6O3

\(CH3Ch(OH)CO2H < -- > H^{+} + CH3CH(OH)CO2^{-}\)

\(Ka = \frac{[H^{+}] [CH3CH(OH)CO2^{-}] }{CH#CH(OH)CO2H} = \frac{C^{2} \alpha^{2} }{C(1-\alpha )} = \frac{C\alpha ^{2} }{(1-\alpha )}\)

As α is too small (1-α) can be neglected.

\(Ka = C\alpha ^{2} \\\\\\alpha = \sqrt[]{\frac{Ka}{C} }\)

\(Ka = 10^{-3,08} = 8,32 .10^{-4} .10^{-4} = 0,35\)

\(\alpha = \sqrt{\frac{ka}{C} } \\\\\alpha = \sqrt{\frac{8,32.10^{-4} }{0,35} } = 0,0487\)

In this case, is possible to see that  approximate degree of dissociation of a 0.35 M solution of lactic acid is 4,87%

See more about pKa at: brainly.com/question/14924722

#SPJ1

The minimum entropy change of the heat-supplying source is -0.87 kJ/K.

In this case, given the initial conditions, we first use the 10-% quality to compute the initial entropy.

S₁ = 1.485  +  (0.1)(5.6865) = 2.0537 kJ/kg K

The entropy at the final state given the new 40-% quality:

S₂ = 1.4337  +  (0.4)(5.7894) = 3.7495 kJ/kg K

m₁ = 0.026/(0.001057   +  0.1 x 1.002643) = 0.257 kg

m₂ = 0.026/(0.001053   +  0.4 x 1.158347)  = 0.056 kg

ΔS + S₁  - S₂  + S₂m₂  - S₁m₁  -  sfg(m₂  -  m₁)  > 0

ΔS + 2.0537 -  3.7495 + (3.7495 x 0.056)  -   (2.0537 x 0.257)  - 5.6865( 0.056 - 0.257)  >  0

ΔS > -0.87 kJ/K

Thus, the minimum entropy change of the heat-supplying source is -0.87 kJ/K.

Learn more about entropy here: brainly.com/question/6364271

#SPJ1

Answer:

Answer is 2.7 Mg(OH)2

Explanation:

2.7 times 2 equals 5.4 NH3

2.7 times 1 equals 2.7MgSO4

You then multiple 2.7 by the product side and you get 2.7 Mg(OH)2

The product is formed by the moles of reactants is used and limiting reagent. the maximum amount of of Mg(OH)₂  that can be produced is 4.6 mol.

Limiting reagent is the substance that is totally consumed when the chemical reaction is complete.

2NH₃ + MgSO₄ + 2H₂0 — Mg(OH)₂ + (NH4)₂SO₄

This is a limiting reagent question. The maximum amount of Mg(OH)₂that can be produced depends on the reactant that produces the least number of moles of Mg(OH)₂  is the limiting reagent. When it is used up, the reaction stops.

The mole ratio between MgSO₄ and Mg(OH)₂ in the balanced equation is 1:1, so 4.6 moles of MgSO2  will produce 4.6 moles of Mg(OH)₂

The mole ratio between NH3 and Mg(OH)₂ is 2:1. Use the mole ratio to calculate the moles of Mg(OH)₂ produced by 5.4 moles of NH₃.

5.4 mol NH₃ × 2 mol Mg(OH)₂/1 mol NH3 = 10.8 mol Mg(OH)₂

4.6 mol MgSO₂ produces the least number of moles of Mg(OH)₂, therefore, in this reaction, the maximum amount of of Mg(OH)₂  that can be produced is 4.6 mol.

To find more about Reaction, refer the link below:

brainly.com/question/ 17434463

#SPJ5

The equation  in the question is: H+H → H + H Complete the equation by filling in the missing parts. missing part is  1 → H+H-2 → →3 → He.

The atomic number of hydrogen is 1, which means it has only one proton in the nucleus and one electron in its shell. Two hydrogen atoms react with each other to form helium. Helium has 2 protons and 2 neutrons in its nucleus and two electrons in its shell. Therefore, the equation is:

H + H → HeIt can be seen that:1. H + H (Reactants)

2. → (Yields or Reacts to form)

3. He (Product)Therefore, the tiles will be arranged as shown below: 1 → H+H-2 → →3 → He

For more question atomic number

https://brainly.com/question/16858932

#SPJ8