How many molecules are there in .230kg of CoCl2?

I have been trying to answer this question but everytime I get the answer it goes to 4.96e-19 or lower. I don't understand what I am doing wrong or what the right way to set up the question.

The Lewis Structure for ClO.  is attached in the image.

Lewis structure represents the structure of atoms or molecules with their valence electron.

It is a two-dimensional model that helps us to know, how many bond pairs and a lone pair a molecule contains.

Lewis structure of ClO⁻ is very simple to draw as it has only two atoms(chlorine and oxygen), we have to just represent the valence electron around them and complete their octet.

1. Count total valence electron in ClO-

Total number of the valence electrons in chlorine = 7

Total number of the valence electrons in oxygen = 6

Total number of valence electrons  = 7 + 6 + 1 = 14 valence electrons        

[∴one oxygen atom, one chlorine, and one negative charge that count as a one valence electron]

2. Find the least electronegative atom and placed it at center

Connect outer atoms to central atom with a single bond Cl-O bond

Now count the valence electron in the above structure.

Single bond means two-electron , only one single bond is used.

Hence, only 2 valence electrons are used in the above structure from 14 total valence electrons available for drawing the lewis structure of ClO-.

(14 – 2) = 12

We have left with 12 valence electrons more.

3.   Place remaining valence electrons starting from outer atom first

So, put the valence electron around the chlorine and oxygen.

we put 6 electrons around chlorine and oxygen, as each of them already sharing 2 electrons with the help of a single bond between them.

The structure can be seen in the figure attached.

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The claim that vinyl gloves have a higher leak rate than latex gloves is supported by the study at a significance level of 0.005.

To determine if vinyl gloves have a higher leak rate than latex gloves, we can conduct a hypothesis test.

The z-value is calculated as:

z = (p₁ - p₂) / √((p₁(1 - p₁) / n₁) + (p₂(1 - p₂) / n₂))

where p₁ and p₂ are the sample proportions, and n₁ and n₂ are the sample sizes.

Certainly! Let's calculate the z-value to determine if vinyl gloves have a higher leak rate than latex gloves.

For vinyl gloves:

Sample size (n₁) = 240

Leaking gloves (x₁) = 0.63 * 240 = 151.2 (approximated to 151)

For latex gloves:

Sample size (n₂) = 240

Leaking gloves (x₂) = 0.07 * 240 = 16.8 (approximated to 17)

We will calculate the z-value using the formula:

z = (p₁ - p₂) / √((p₁(1 - p₁) / n₁) + (p₂(1 - p₂) / n₂))

where p₁ and p₂ are the sample proportions.

p₁ = x₁ / n₁ = 151 / 240 ≈ 0.629

p₂ = x₂ / n₂ = 17 / 240 ≈ 0.071

Calculating the z-value:

z = (0.629 - 0.071) / √((0.629 * (1 - 0.629) / 240) + (0.071 * (1 - 0.071) / 240))

z ≈ 13.239

The calculated z-value is approximately 13.239. To determine if the claim is supported, we compare this value to the critical z-value for a one-tailed test at a significance level of 0.005.

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Answer:

54 days

Explanation:

We have to use the formula;

0.693/t1/2 =2.303/t log Ao/A

Where;

t1/2= half-life of phosphorus-32= 14.3 days

t= time taken for the activity to fall to 7.34% of its original value

Ao=initial activity of phosphorus-32

A= activity of phosphorus-32 after a time t

Note that;

A=0.0734Ao (the activity of the sample decreased to 7.34% of the activity of the original sample)

Substituting values;

0.693/14.3 = 2.303/t log Ao/0.0734Ao

0.693/14.3 = 2.303/t log 1/0.0734

0.693/14.3 = 2.6/t

0.048=2.6/t

t= 2.6/0.048

t= 54 days

Answer:

The pH scale measures acidity of a substance. known as potential of hydrogen, it varies from 0 to 14 with 7 being the pH value of a neutral solution. Below 7 shows the substance is acidic in nature and above 7 is alkaline in nature. pH 0-3 are considered strong acids while pH 4-6 are weak acids. pH 8-10 are weak alkalines and pH 11-14 are strong alkalines. This is a general trend and there may be exeptions especially if the substance has a negative pH. However, it would not be covered likely unless you are doing university chemistry.

An acidic hydrogen atom is removed from the -carbon of a carbonyl molecule, such as a ketone or an aldehyde, to create an anion known as an enolate.

Deprotonation is the removal of an acidic hydrogen from the -carbon of a carbonyl molecule, and it is frequently accomplished with the aid of a potent base, such as sodium hydroxide or potassium hydroxide.

A negatively charged enolate ion is produced when a base removes an acidic hydrogen from the carbonyl compound's -carbon. This ion is stabilized by resonance with the carbonyl group.

The enolate anion is highly reactive as a result of its resonance stabilization, serving as an important intermediate in a variety of chemical processes such aldol condensations, Michael additions, and Claisen reactions.

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True. Potassium-40 is useful in determining the age of a fossil in samples. This isotope is commonly utilized in a dating technique called potassium-argon (K-Ar) dating, which is a type of radiometric dating method.

Radiometric dating techniques involve analyzing the abundance of certain isotopes in a sample to determine the time elapsed since the formation or alteration of the material.

Potassium-40 undergoes a radioactive decay process, turning into argon-40 over time. By measuring the ratio of potassium-40 to argon-40 in a given sample, scientists can determine the age of the sample based on the known decay rate of potassium-40. This method is especially useful for dating geological samples, such as rocks and minerals, as well as some types of fossils that are millions to billions of years old.

However, it is important to note that potassium-argon dating is not effective for dating all types of fossils or materials. The technique is best suited for samples with a significant amount of potassium-bearing minerals, and it may not provide accurate results for fossils that are only thousands of years old or those lacking sufficient potassium content. Despite these limitations, potassium-40 remains a valuable tool for scientists studying Earth's history and the age of various fossils within geological samples.

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The best reagent for each step is NaNH2, NH2 and CH3I, and HBr.

First of all in the presence of strong base ammonia, we het the clcylated product chain elongation gives but-2-ene followed by bromination gives 2-dibromobutane.

Alkyne using NH3 gets converted into Elongated chain alkyne followed by Hbr.

The reaction of bromine with (E)-stilbene is a classic reaction performed as an example of an electrophilic addition reaction of alkenes. The reaction is stereospecific through an anti addition to the double bond. The traditional reaction uses a bromine solution in methylene chloride, which has very high toxcity.

This bromination reaction demonstrates the stereochemistry of the electrophilic addition of bromine to an alkene. The bromine in this greener approach is generated in situ and eliminates the use of methylene chloride.

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6.94 is much more closet to 7.016, so Li 7 is more abundant

Answer:Land Population

The formula of sodium oxide is Na2O .

Answer:

The answer to this is Na2O

Answer:

478.8 g/cm^3

Explanation:

the best thing to remember is that Volume and density are the only ones that multiply to each other. Density to mass and volume to mass is just division.

The key differences between the Articles of Confederation and the U.S Constitution is the article of confederation is sovereignty in states and the constitution  is expand the governments authority.

The document created the better system of government for the new nation is the US constitution.

The Article of confederation , the state have stronger power than the central power and in the US constitution , the power of central government is stronger than the states. The important development was the establishment of three departments. There are three departments of government that is legislative , executive and judicial.

Thus, The key differences between the Articles of Confederation and the U.S. Constitution is the article of confederation is sovereignty in states and the constitution  is expand the governments authority.

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Answer:

I think is d.

Explanation:

particles that make up the nucleus are balanced. An atom is unstable (radioactive) if these forces are unbalanced; if the nucleus has an excess of internal energy. the Instability of an atom's nucleus may result from an excess of either neutrons or protons.

I'm not sure, but hope it helps.

Forming very strong bond characteristics indicates that an atom is unstable. Hence, option D is correct.

An atom is any particle of matter which contains at least one proton.

An atom is unstable if the nucleus has an excess of internal energy.

The Instability of an atom's nucleus may be due to an excess of either neutrons or protons.

Hence, forming very strong bond characteristics indicates that an atom is unstable.

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According to the Department of Transportation (DOT), hazardous materials are defined as materials that can pose an unreasonable risk to health, safety, or property during transportation.

These materials can include explosives, flammable gases and liquids, toxic substances, radioactive materials, and more. The DOT has specific regulations in place for the transportation of these materials to ensure that they are handled and transported safely to minimize the risk of accidents or harm.

These regulations include:

It is important to follow these regulations to prevent accidents and protect the health and safety of those involved in the transportation of hazardous materials.

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19.7 litre volume of carbon dioxide gas at 22.0o C and 102 kPa can be collected over water.

Vapour pressure is a measure of the tendency of a material to change into the gaseous or vapour state, and it increases with temperature.

Moles of Butane = mass in grams / molar mass = 11.6 / 58.12 = 0.2

Volume of \(O_2\) (V) = 40 liter

Temperature (T) = 22°C = 22 + 273 = 295 K

Pressure (P) = 102 kPa = 102 / 101.325 = 1.007 atm

Moles of \(O_2\) (n) can be calculated by ideal gas equation.

PV = nRT

n = 1.007 40 ÷ 0.0821 295 = 1.663

Balanced chemical reaction;

2\(C_4H_10\) + 13\(O_2\) ---> 8\(CO_2\) + 10\(H_2O\)

From reaction;

13 moles \(O_2\) require 2 moles \(C_4H_10\)

So, 1.663 moles \(O_2\) will require = 2 x 1.663 ÷13 = 0.256 moles of \(C_4H_10\)

Thus \(C_4H_10\) is a limiting reagent. So it will drive the yield of \(CO_2\).

Moles of \(CO_2\) produced = (8/2) 0.2 = 0.8 moles

Pressure of \(CO_2\) (P) = 102 - 2.24 = 99.76 kPa = 99.76  ÷ 101.325 = 0.985 atm

Applying the ideal gas equation for \(CO_2\),

PV = nRT

0.985 V = 0.8 0.0821 x 295

V = 19.7 liter

The volume of \(CO_2\) produced = 19.7 liter.

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Answer:polyatomic molecules

Explanation:molecule, a group of two or more atoms that form the smallest identifiable unit into which a pure substance can be divided and still retain the composition and chemical properties of that substance.Characteristics of molecules

The division of a sample of a substance into progressively smaller parts produces no change in either its composition or its chemical properties until parts consisting of single molecules are reached. Further subdivision of the substance leads to still smaller parts that usually differ from the original substance in composition and always differ from it in chemical properties. In this latter stage of fragmentation the chemical bonds that hold the atoms together in the molecule are broken.

[Ar] 4s²3d7 is  the electron configuration of an atom of the element highlighted in this outline of the periodic table

Highlighted place in the periodic table  is 4th period and 9 th group

so it's atomic number is 18+9 = 27

27 is the atomic number of cobalt

electronic configuration is [Ar] 4s2 3d7

Different levels of energy exist in the atom of an element and these levels are filled with electron. The electrons in the innermost shell has the lowest energy level while the electrons in the outermost shell has the highest energy level. For an electron to increase its energy level, it has to move to an higher shell; and to decrease its energy level it has to move to a lower shell.

write the electron configuration of an atom of the element highlighted in this outline of the periodic table: hint: you do not need to know the name or symbol of the highlighted element!

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The conversion of ribulose-5-phosphate to glycolytic intermediates, the enzyme phosphopentose isomerase (ribose-5-phosphate isomerase) is utilized.

In the conversion of ribulose-5-phosphate to glycolytic intermediates, the enzyme used is phosphopentose isomerase, also known as ribose-5-phosphate isomerase.

Phosphopentose isomerase is responsible for catalyzing the interconversion of ribulose-5-phosphate (a pentose sugar) and ribose-5-phosphate (another pentose sugar).

This enzymatic reaction is part of the pentose phosphate pathway (also known as the phosphogluconate pathway) in cellular metabolism.

The conversion of ribulose-5-phosphate to ribose-5-phosphate is important for the production of various glycolytic intermediates, including fructose-6-phosphate and glucose-6-phosphate.

These intermediates play crucial roles in glycolysis, a metabolic pathway involved in the breakdown of glucose to produce energy in the form of ATP.

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Answer:

So what is the question ..

The chemical formula \(Al_2SiO_5\) can form the three minerals, andalusite, kyanite, and sillimanite under different combinations of temperature and pressure conditions. Option D is correct.

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If one form of a gene can mask the appearance of another form, that form is considered dominant over the other form. Option B.

According to Mendel, genes are usually made up of 2 alleles. These alleles can be the same or different. When the alleles are the same, the gene is said to be homozygous. If the alleles are different, the gene is said to be heterozygous.

When the two alleles that make up a gene are different, one will be dominant and the other will be recessive. The dominant gene masks the effect of the recessive gene. In other words, the recessive gene cannot be expressed as long as it coexists with the dominant gene. In order for it to be expressed, it has to be in two copies or a homozygous recessive form.

For the dominant allele, however, only one copy is needed for it to be expressed.

In summary, if one form of a gene can mask the appearance of another form, that form is considered dominant over the other form.

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Answer:

20ml

Explanation:

using the formula;C1V1=C2V2

2.5×V1=0.2×250

2.5V1= 50

V1=50/2.5

V1=20L

Answer:

The atomic mass of nitrogen is

Answer:

14.007 amu

Explanation:

Nitrogen has atomic mass of 14.007 amu.

Answer: more in the wild

Explanation: