What is the pressure exerted by fluorine gas with a temperature of 20ºC (293 K) and a volume of 9.5 L and a pressure of 1.4 atm if the temperature changes to 10 ºC (283 K) and volume is changed to 8.4 L?

P2 = ___ atm ( Answer Format: X.XX)

Answer:

3287.04 grams

Explanation:

The mass of 3.21 × 10²⁴ molecules of potassium hydroxide is equal to  298.5 g.

Avogadro’s constant can be explained as the proportionality factor that can be used to count the number of particles such as molecules, atoms, or ions in a given sample with a definite amount of substance.

Avogadro's number can be described as the approximate number of nucleons in 1 gram of substance. The value of the Avogadro constant can be expressed as the mass of one mole of a compound, in grams.

The value of Avogadro’s number is found about 6.022×10²³ mol⁻¹.

Given, the number of molecules of the KOH = 3.21 × 10²⁴

The mass of the one mole of KOH = 56 g/mol

The 6.022 × 10²³ molecules of KOH has mass = 56 g

The mass of 3.21 × 10²⁴ molecules of KOH = 56×(3.21× 10²⁴/6.022 × 10²³)

= 298.5 g

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I first converted the given grams of the reactants into moles, and then divided the moles by the coefficients in front of each of the reactant. The result with the smallest value will be the limiting reactant, and the value of CuO was the smallest, so it's the limiting reactant.

After figuring out which reactant is the limiting one, I took their given grams and converted it into moles, the divided it by the ratio of N2 to CuO (it's in the equation) to obtain the moles of N2, and then multiply it with the molar mass of N2 to get its mass in grams.

Answer:

The correct answer would be = 0.1593 mCi.

Explanation:

The initial 123I = 2.55 mCi (given)

We know that the half-life of radioactive I-123 =  12 hours approximately.

So, we can say that in 48 hours there will be four half-lives of 123I,

Hence after four half-life or 48 hours, the final 123I would be:

= 2.55 * (1/2⁴)

= 2.55 * (1/16)

= 0.1593 mCi

Thus, the correct answer would be = 0.1593 mCi.

Heat is added to ice at 0 °C. Explain why the temperature of the ice does not change. What does change?When heat is added to ice at 0°C, the temperature of the ice does not change. This happens because all the heat energy is used up in overcoming the intermolecular forces of attraction (hydrogen bonds) that exist between the water molecules in ice.

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Answer:

He did not boil his broth long enough and the flasks were not cleaned prior to the experimenter

The negative electrons are in the outermost orbits and are involved in chemical reactions. they determine the chemical of an atom. (FALSE)

It should be valence electrons.

In predicting a chemical reaction that will occur, it is necessary to take into account the number of electrons contained in an atom. In addition, valence electrons play a role in chemical bond formation reactions. Valence electrons are the outermost electrons in atoms which have the highest energy level and are involved in chemical bonds. Valence electrons are located farther from the nucleus of the atom, so that the electrons of one atom can be attracted more or less by the nucleus than the nuclei of other atoms.

An atom tends to be unreactive or stable (inert) so it is difficult to interact with other types of atoms when the valence electrons are fully filled, which resembles s2p6. Meanwhile, an atom tends to be reactive if there is an excess of one or two atoms resembling groups IA, IIA, and IIIA. However, there are also atoms that lack a few electrons, which are called more reactive, such as groups XVIA and XVIIA.

Petrucci R.H., Harwood W.S. and Herring F.G. in General Chemistry in 2002 states that:

" In the main group elements, valence electrons are defined as the electrons in the electron shell with the highest principal quantum number, n."

The number of valence electrons an atom has depends on its electron configuration.

Your question is incomplete but most probably your full question was:

Determine True/False! the negative electrons are in the outermost orbits and are involved in chemical reactions. they determine the chemical of an atom.

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Answer:

B. 1-amino-2-methylpentan-2-ol

Explanation:

In this case, the first step, we have the attack of the nucleophile cyanide (\( CN^-\) produced by sodium cyanide to the carbon on the carbonyl group (C=O) producing a negative charge in the oxygen.

Then HCl protonates the molecule to produce a cyanohydrin. This cyanohydrin can be reduced by the action of hydrogen gas (\(H_2\)) in the presence of a catalyst (\(Pd\)), producing an amino group. With this in mind, the final molecule is: 1-amino-2-methylpentan-2-ol.

See figure 1 to further explanations

I hope it helps!

She may investigate what the canyon's geologists have already learned. She could coordinate the hues with those of other things she had at home. She may take a stroll into the canyon and study the many layers of the rocks.

The environment in which sedimentary rocks are deposited affects their hue. Where oxygen is present, red rocks develop. When there is little oxygen present, sediments get darker.

Variations in the carrying capabilities of the depositing agent are the most frequent source of stratification. Sediments are sorted by water and wind into strata of relative homogeneity based on the size, weight, and form of the individual particles.

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Answer:

antimony-121 has the highest percent natural abundance

Explanation:

percent natural abundance;

121.76 = 120.90 x + 122.90 (1 - x)

121.76 = 120.90 x + 122.90 - 122.90x

121.76 = -2x + 122.90

121.76 - 122.90 = -2x

x= 121.76 - 122.90/ -2

x= 0.57

Where x and 1 - x refers to the relative abundance of each of the isotopes

Percent natural abundance of antimony-121 = 57 %

Percent natural abundance of antimony-123 = (1 - 0.57) = 43%

Let us remember that isotopy refers to a phenomenon in which atoms of the same element have the same atomic number but different mass numbers. This results from differences in the number of neutrons in atoms of the same element.

We can clearly see that antimony-121 has the highest percent natural abundance.

Answer:

Loam soil* is soil composed of equal parts sand, silt, and clay.

Explanation:

Combination Reaction.

Explanation:

Title: The First Amendment: Safeguarding Fundamental Freedoms

While all amendments are crucial, the First Amendment holds unparalleled significance in upholding the principles of liberty, equality, and democracy.

The First Amendment to the U.S. Constitution is undoubtedly the most important amendment as it safeguards fundamental freedoms that form the bedrock of a democratic society.

This amendment, which encompasses the rights of freedom of speech, religion, press, assembly, and petition, plays a vital role in protecting individual liberties and ensuring a just and inclusive society. There are three key reasons why the First Amendment stands out as the cornerstone of our democracy.

Firstly, freedom of speech allows citizens to express their ideas, opinions, and criticisms, fostering a robust marketplace of ideas essential for progress and social change. This right empowers individuals to challenge authority, hold public officials accountable, and engage in meaningful dialogue that drives societal progress.

Secondly, freedom of religion guarantees individuals the right to practice their faith without interference from the state. This principle promotes religious tolerance, diversity, and pluralism, creating a society where individuals can freely worship and live in accordance with their beliefs.

Lastly, freedom of the press ensures an informed citizenry by safeguarding independent journalism. A free press acts as a check on governmental power, exposes corruption, and provides essential information necessary for a functioning democracy.

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It occurs in oxygen I think

Explanation:

Please, look at the following drawing:

According to this graph, the answers will be:

Freezing = a change from liquid to solid

Sublimation = a change from solid to gas

Condensation = a change from gas to liquid

Vaporization = a change from liquid to gas

Answer:

A 70%

B 92%

C 87%

D 79%

Explanation:

This excercise is about dividing water by liquid.

Answer:

8.324 g

Explanation:

First we convert 750.0 mL into L:

Then we calculate the required number of moles of CaCl₂, using the definition of molarity:

Finally we convert 0.075 moles of CaCl₂ into grams, using its molar mass:

We inherit genes from our biological parents in specific ways. One way is called autosomal dominant inheritance.

What is autosomal dominant inheritance?

Autosomal dominant inheritance means that the gene in question is located on one of the autosomes. These are numbered pairs of chromosomes, 1 through 22. (These chromosomes do not determine an offspring's gender.) Dominant means that only one gene from one parent is necessary to pass down a trait or a disorder. When a parent has a dominant trait or disorder, there is a 50 percent chance that any child he or she has will also inherit the trait or disorder:

Genetic illustration demonstrating autosomal dominant inheritance

Click Image to Enlarge

What is Marfan syndrome?

Marfan syndrome occurs in one of 5,000 live births. It is a connective tissue disorder associated with autosomal dominant inheritance. Connective tissue is abundant in the body and is important as a supporting structure. It is especially important for the musculoskeletal system. It also provides support for other body systems as well, including the eyes and the heart. The gene for Marfan syndrome is called fibrillin-1. This gene is localized to chromosome #15 on the long arm (q) at 15q21.1.  

Common findings in individuals with Marfan syndrome include those related to connective tissue disorders. These include abnormal enlargement of the aortic root of the heart, dislocated lenses of the eyes, and a tall, lanky body with increased joint mobility, scoliosis, long flat feet, and long fingers. Findings may vary among individuals diagnosed with this condition, even within a family.

If an individual carries an abnormal gene for Marfan syndrome, that individual has a 50 percent risk of passing down the disorder to each future offspring. If a person does not carry the gene abnormality, then the risk for occurrence of the disorder in future offspring is the same as for the general population.

Explanation:

The order of reaction can be known from the rate equation.

The question is incomplete but I will try to explain the concept of order of reaction to you.

We have to note that when we talk about the order of the reaction what we mean is the order that we can be able to obtain from the stoichiometry of the reaction.

We do not only look at the reaction equation as we try to obtain the order of reaction but we rely so heavily on the empirical data that we can get from the reaction for the order of reaction in each specie.

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Answer:

See figure 1

Explanation:

In this question, we have to remember that a poor electron carbon is a carbon in which we have a positive charge, a carbocation. Therefore we have to start with the production of the carbocation. First, a double bond from the benzene is moved to the carbon in the top to produce a new double bond generating a positive charge in a carbon with ortho position (electron-poor). Then we can move another double bond inside the ring to produce a positive charge in the para carbon. Finally, we can move the last double bond to produce again another positive charge in the second ortho carbon.

See figure 1.

I hope it helps!

Answer:

37.09 g of B₅H₉ is required to form 148 g of  borate salt( Na₂B₄O₇  )

Explanation:

Given the data in the question;

B₅H₉ → H₃BO₃ → Na₂B₄O₇

find the mass (in grams) of B5H9 required to form 148 g of the borate salt by this reaction sequence.

S                                M.W

B₅H₉                          63

H₃BO₃                       62

Na₂B₄O₇                   201

So, moles of Na₂B₄O₇  = 148 / 201 = 0.736

Since Boron will be conserved,

Moles of Boron atoms in Na₂B₄O₇  will be;

⇒ 4 × 0.736 = 2.944

Now, Moles of Boron in Na₂B₄O₇ = Moles of Boron in H₃BO₃ = Moles of Boron in B₅H₉  

Hence,

Moles of Boron in B₅H₉ = 2.944

Moles of B₅H₉ = 2.944 / 5 = 0.5888

Mass of B₅H₉ = 0.5888 × 63 = 37.09 g

Therefore, 37.09 g of B₅H₉ is required to form 148 g of  borate salt( Na₂B₄O₇  )

Answer:

What's the gas given in the question??

Explanation:

TRUE

the answer is true. Trust me. Im an expert at this.

Answer:

\(V=0.0333L=33.3 mL\)

Explanation:

Hello there!

In this case, according to the given information, it is necessary for us remember that the molarity is calculated by dividing the moles by the volume of the solution in liters so the volume is calculated by dividing moles by the given molarity. However, we first need to calculate the mole given the mass and molar mass of the solute, H2SO4:

\(n=\frac{9.809g}{98.09g/mol}=0.1mol\)

Thus, the volume turns out:

\(V=\frac{0.1mol}{3.00mol/L}\\\\V=0.0333L=33.3 mL\)

Regards!

Answer:

C. aquifer

Explanation:

I just did a lesson on this

:)

Exactly 149.6J will raise the temperature of 10.0g of a metal from 25.0C. The specific heat capacity of the metal is 5.984 J/g°C.

The heat capacity of a sample of a substance divided by the mass of the sample yields the specific heat capacity (symbol c), also known as massic heat capacity. Informally, it is the quantity of heat that must be added to one unit of a substance's mass in order to raise its temperature by one unit. The specific heat capacity unit in the SI is the joule per kelvin per kilogram, or Jkg⁻¹K⁻¹. For instance, the specific heat capacity of water is 4184 J kg⁻¹K⁻¹, or the amount of energy needed to raise 1 kilogram of water by 1 K.

The specific heat capacity of the metal can be calculated using the equation Q = m × c ×ΔT.

Q = 149.6J

m = 10.0g

ΔT = (final Temperature - initial Temperature) = (25°C - 0°C) = 25°C

Plugging these values into the equation, we get:

149.6J = 10.0g × c ×25°C

Solving for c, we get:

c =  \(\frac{149.6J}{(10.0g *25C)}\)

c = 5.984 J/g°C

Therefore, the specific heat capacity of the metal is 5.984 J/g°C.

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So,

The reaction that we're performing is the next one:

We need to balance it first:

To balance, we verify that the number of atoms of each element in the reaction is the same before and after it occurs. As you can see, we have the same amount of atoms of each type before and after so the reaction is balanced now.

Now, we want to find the amount of Hydrogen gas (in liters) that we would obtain if we start with 0.11 grams of Mg. For this, we could follow the next steps:

Step 1. First, we should pass the 0.11 grams of Mg to moles of Mg. To do this, we divide by the molar mass of Mg:

Step 2. Apply the stoichiometry of the given reaction and then use the fact that 1 mole of any gas is equal to 22.4L of the gas:

Therefore, we produce 0.1014 L of H2.

c. If the conditions are 23 Celsius and 105.2Kpa, we could use the ideal gas formula to find the theoretical volume of hydrogen gas.

Remember that 23 Celcius = 296K and 105.2Kpa = 1,0382atm.

Now, if we replace:

Solving for V, we obtain that the theoretical volume is:

Which is approximately equal to the volume of the point b.

Answer:

Lewis electron dot notation is a method for representing the valence electrons in an atom. In this notation, the valence electrons are shown as dots around the symbol of the element. The number of dots represents the number of valence electrons.

The Lewis electron dot notation is a useful tool for understanding the chemical behavior of elements. It allows us to see how many valence electrons an atom has and how they are distributed. This information can be used to predict the types of chemical bonds that an atom is likely to form. For example, the Lewis electron dot notation for nitrogen is:
N: ·
Nitrogen has five valence electrons, so there are five dots around the symbol.
In addition to representing individual atoms, the Lewis electron dot notation can also be used to represent molecules. In a molecule, the dots represent the shared electrons between the atoms.  The Lewis electron dot notation is an important concept in chemistry that helps us to understand the properties and behavior of atoms and molecules.

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Answer:

A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat.