PLEASE ANSWER ASAP1. How many atoms are present in 8.500 mole of chlorine atoms?
2. Determine the mass (g) of 15.50 mole of oxygen.
3. Determine the number of moles of helium in 1.953 x 108 g of helium.
4. Calculate the number of atoms in 147.82 g of sulfur.
5. Determine the molar mass of Co.
6. Determine the formula mass of Ca3(PO4)2.
IT WOULD BE HELPFUL
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Answer:

190.2755580923 years

Explanation:

Answer:

T₂ = 317.87 K

Explanation:

Given data:

Initial pressure = 15 atm

Final pressure = 16 atm

Initial temperature = 298 K

Final temperature = ?

Solution:

According to Gay-Lussac Law,

The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.

Mathematical relationship:

P₁/T₁ = P₂/T₂

Now we will put the values in formula:

15 atm / 298K = 16 atm/T₂

T₂ = 16atm × 298 K / 15 atm

T₂ = 4768 atm. K / 15 atm

T₂ = 317.87 K

The Pauli exclusion principle is a fundamental principle of quantum mechanics that states that no two electrons in an atom can occupy the same quantum state simultaneously.

This means that two electrons in an atom cannot have the same set of quantum numbers (n, l, m, and s), where n is the principal quantum number, l is the angular momentum quantum number, m is the magnetic quantum number, and s is the spin quantum number.

The exclusion principle has important consequences for the electronic structure of atoms and molecules. It explains why electrons occupy different energy levels and orbitals in an atom, and why they occupy different energy levels in different atoms in a molecule. It also explains why electrons occupy different spin states in an orbital, leading to a maximum of two electrons in a single orbital.

The Pauli exclusion principle is a key principle in the understanding of the electronic structure of atoms and molecules, and has important implications for many chemical and physical properties, including reactivity, bonding, and spectroscopy. It also plays a critical role in our understanding of many phenomena in materials science, solid-state physics, and condensed matter physics.

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Answer:

To convert m/sec into mi/hr, multiply the number by 2.236936 and then round off the answer to the required decimal places.

2500 ×2.236936

= 5592.34 mi/hr

Answer:

Logan could explain the lower mass by explaining that the reaction between hydrochloric acid and magnesium produces hydrogen gas, which escapes and therefore is not included in the final combined mass measurement. The reaction is:HCl + Mg → MgCl2 + H2Since the hydrogen gas has mass, its escape from the reaction vessel explains the decrease in the combined mass of the reactants after the reaction.

This answers may help you

Answer:

C

Explanation:

I hypothesis needs to be tested to know whether it is true or not. Here is the definition:

A supposition or proposed explanation made on the basis of *limited evidence as a started point for further investigation*

Answer

Molarity (C) = 0.41 mol/L

Explanation

Given:

Number of moles = 3.5 moles

Volume = 8.50 L

Required: Molarity of the solution

Solution

To solve for molarity, you can use the following equation

Where C is the concentration or molarity, n is the number of moles and V is the volume of the solution.

C = 3.5 mol/8.50 L

C = 0.41 mol/L

To calculate the amount of heat produced when propanol burns in oxygen, we need to use the balanced chemical equation for the combustion of propanol.

The balanced equation tells us that for every mole of propanol that reacts, 5 moles of oxygen are consumed and 3 moles of carbon dioxide and 4 moles of water are produced.

\(C3H7OH + 5O2 \rightarrow 3CO2 + 4H2O\)

To find the amount of heat produced, we need to use the standard enthalpy of formation values for the reactants and products in the balanced equation.

The standard enthalpy of formation is the heat change that occurs when one mole of a substance is formed from its constituent elements in their standard states at a given temperature and pressure.

Using the standard enthalpy of formation values, we can calculate the heat of reaction using the following equation:

\(\Delta H\) = ∑( \(\Delta H\) f° products) - ∑(\(\Delta H\)f° reactants)

Where \(\Delta H\) is the heat of reaction, and \(\Delta H\) If° is the standard enthalpy of formation of the respective substance.

For propanol, \(C_3H_7OH\) , the standard enthalpy of formation is  \(-302.0 kJ/mol.\)

For carbon dioxide, \(CO_2\) , the standard enthalpy of formation is  \(-393.5 kJ/mol.\)

For water, \(H_2O\) , the standard enthalpy of formation is \(-285.8 kJ/mol.\)

Since we have  \(58.5g\) of propanol, we can first calculate the number of moles of propanol:

\(n = m/M\)

where m is the mass of propanol and M is its molar mass.

M(C3H7OH) \(= 3(12.01 g/mol) + 8(1.01 g/mol) + 1(16.00 g/mol) = 60.10 g/moln = 58.5 g / 60.10 g/mol = 0.974 mol\)

From the balanced equation, we know that \(0.974 mol\) of propanol reacts with 5 times that amount, or  \(4.87 mol\) of oxygen.

Using the standard enthalpy of formation values, we can calculate the heat of reaction:

ΔH  \(= (3 mol CO2 × -393.5 kJ/mol CO2) + (4 mol H2O × -285.8 kJ/mol H2O) - (1 mol C3H7OH × -302.0 kJ/mol C3H7OH)= -2220.7 kJ\)

Therefore, the heat produced when \(58.5 g\) of propanol burns in excess oxygen is - \(2220.7 kJ\), or approximately  \(-2.22 × 10^3 kJ\) . Note that the negative sign indicates that the reaction is exothermic, meaning that heat is released during the reaction.

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do you have some examples or options to answer ?

The purpose of a catalyst in the production of hydrogen is to increase the rate at which water molecules decompose.

What is a catalyst-A catalyst is a substance that increases the rate of a chemical reaction without itself being consumed or produced during the reaction. As a result, catalysts assist in speeding up chemical reactions while also decreasing the amount of energy needed for the reaction to occur. In hydrogen production, catalysts are used to speed up the decomposition of water into hydrogen and oxygen. The use of catalysts lowers the activation energy required for the reaction to occur, resulting in a faster reaction rate and lower operating temperatures.What is the process of hydrogen production?Hydrogen production has various methods, and one of the most commonly used methods is water electrolysis. In this method, water molecules are split into hydrogen and oxygen using an electric current passed through an electrode. Water is broken down into hydrogen and oxygen during the process, with the assistance of a catalyst. During this process, a catalyst like platinum or nickel is employed to speed up the chemical reaction of water decomposition.

When an electric current is applied to the catalyst, water molecules are broken apart, releasing hydrogen and oxygen atoms.Catalysts lower the activation energy of the reaction, allowing it to occur faster than it would otherwise. In hydrogen production, catalysts are crucial since they enable the reaction to occur at a lower temperature, reducing energy consumption and minimizing operating costs. As a result, the use of catalysts is essential to the production of hydrogen.

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Answer:

"2.Orbital." I think

Explanation:

Risk*

Answer: 3.156 * 10^7

Explanation: I do not really understand your question. You answered it yourself!

Scientific notation shortens large numbers. The number right after the decimal point can only be between 1 and 9, which you did correctly. When converting to scientific notation, the exponent of ten is based on how many places you moved the decimal and the direction you moved it (left, positive; right, negative). In this case, the exponent of ten is a positive seven.

You did everything correctly :) Good job!

Answer:

1. F, H, E

2. A, D, I

3. G

4. E, B, H

5. C

Explanation:

Answer:

\(\Delta G_{rxn}=51.0kJ/mol\)

Explanation:

Hello there!

In this case, according to the definition of the Gibbs free energy of reaction in terms of the Gibbs free energy of formation of the involved reactants and products, it is possible for us to compute it as shown below:

\(\Delta G_{rxn}=3\Delta _f G_{NO_2}+\Delta _f G_{H_2O}-2\Delta _f G_{HNO_3}-\Delta _f G_{NO}\)

Thus, by plugging in the given data, it is possible to obtain:

\(\Delta G_{rxn}=3(51.3)+(-237.1)-2(-110.9)-(87.6)\\\\\Delta G_{rxn}=51.0kJ/mol\)

Best regards!

The standard Gibbs free energy change (ΔG°rxn) for the reaction is 76.7 kJ/mol.

The balanced equation for the reaction is:

2 HNO₃(aq) + NO(g) → 3 NO₂(g) + H₂O(l)

The standard free energy change for a reaction ( ΔG0rxn) can be found out using the equation,

ΔG° = Σ ΔG°fproducts - Σ ΔGf° ​​​​​reactants

ΔG°rxn = ΔH°rxn - TΔS0rxn  

∆H°rxn = change in enthalpy of reaction

∆S° = Change in entropy of reaction

T = Temperature ( 298 K )

ΔG°rxn = (3 × ΔG°f(NO₂(g)) + ΔG°f(H₂O(l))) - (2 × ΔG°f(HNO₃)aq)) + ΔG°f(NO(g)))

Substituting the given ΔG°f values:

ΔG°rxn = (3 × 51.3 kJ/mol) + (-237.1 kJ/mol) - (2 × (-110.9 kJ/mol)) + (87.6 kJ/mol)

ΔG°rxn = 153.9 kJ/mol - 237.1 kJ/mol + 221.8 kJ/mol + 87.6 kJ/mol

ΔG°rxn = 226.2 kJ/mol - 149.5 kJ/mol

ΔG°rxn = 76.7 kJ/mol

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Answer:

A compound  is material formed by chemically bonding two or more chemical elements.And if it can be separated than you know that its a compound.

Explanation:

have a goooooooood day:)

It will take 3.43 minutes for the same amount of ethane to effuse.

t(He) = 1.25 min; time of helium to effuse

M(He) = 4 g/mol; molar mass of helium

M(C₂H₆) = 30 g/mol; molar mass of ethane

rate of effusion of helium = 1/√M(He)

rate of effusion of helium = 1/√4

rate of effusion of helium = 0.5

rate of effusion of ethane = 1/√M(C₂H₆)

rate of effusion of ethane = 1/√30

rate of effusion of ethane = 0.182

rate of effusion of helium : rate of effusion of ethane = 0.5 : 0.182

rate of effusion of helium : rate of effusion of ethane = 2.74

t(C₂H₆) = 1.25 min × 2.74

t(C₂H₆) = 3.43 min

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The bond order of NO is 0, indicating that the bond is not a stable bond. Molecular orbital theory can be applied to determine the bond order of NO by considering the molecular orbitals that are formed from the atomic orbitals of nitrogen and oxygen


The first molecular orbital that is formed from nitrogen and oxygen is the sigma bonding molecular orbital, denoted as sigma(2p) in NO. This molecular orbital is formed by adding the 2p atomic orbitals of nitrogen and oxygen in phase, meaning that the peaks of the waves align. This results in a lower energy molecular orbital that is bonding in nature. The sigma(2p) molecular orbital contains two electrons, one from nitrogen and one from oxygen, that occupy the lowest energy level in the molecular orbital diagram.

The second molecular orbital that is formed from nitrogen and oxygen is the sigma* anti-bonding molecular orbital, denoted as sigma*(2p) in NO. This molecular orbital is formed by subtracting the 2p atomic orbitals of nitrogen and oxygen out of phase, meaning that the peaks of one wave align with the troughs of the other. This results in a higher energy molecular orbital that is anti-bonding in nature. The sigma*(2p) molecular orbital contains two electrons, one from nitrogen and one from oxygen, that occupy the highest energy level in the molecular orbital diagram.

The third molecular orbital that is formed from nitrogen and oxygen is the pi bonding molecular orbital, denoted as pi(2p) in NO. This molecular orbital is formed by adding the 2p atomic orbitals of nitrogen and oxygen in phase along the internuclear axis, meaning that the peaks of the waves align along a line connecting the two atoms. This results in a lower energy molecular orbital that is bonding in nature. The pi(2p) molecular orbital contains two electrons, one from nitrogen and one from oxygen, that occupy the second lowest energy level in the molecular orbital diagram.

The fourth molecular orbital that is formed from nitrogen and oxygen is the pi* anti-bonding molecular orbital, denoted as pi*(2p) in NO. This molecular orbital is formed by subtracting the 2p atomic orbitals of nitrogen and oxygen out of phase along the internuclear axis, meaning that the peaks of one wave align with the troughs of the other along a line connecting the two atoms. This results in a higher energy molecular orbital that is anti-bonding in nature. The pi*(2p) molecular orbital contains two electrons, one from nitrogen and one from oxygen, that occupy the second highest energy level in the molecular orbital diagram.


Bond order = (number of electrons in bonding molecular orbitals - number of electrons in anti-bonding molecular orbitals)/2
Bond order = (4 - 4)/2
Bond order = 0

In conclusion, the bond order of NO is 0, indicating that the bond is not a stable bond.

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Answer: C. Na2B4O7•10H2O

Explanation:

Hope this helps :)

The formula is tetrasodium borate-Na2B4O7.10H2O

Given- 0.0132 mol Na2B4O7 and 0.1311 mol H2O

Using the molar mass of the anhydrous Na2B4O7 and its mass percentage, we can calculate the molar mass of the hydrate (if we look at it as 100% of the mass) by stoichiometry.

Molar mass of Na = (22.990 g/mol)

Molar mass of B = (10.811 g/mol)

Molar mass of O = (15.999 g/mol)

Molar mass of Na2B4O7= 2⋅22.990 g/mol +4⋅10.811 g/mol +7⋅15.999 g/mol = 201.217 g/mol

201.217g/mol : 52.8%=x g/mol : 100%

​x g/mol = 201.217 g/mol⋅100%÷52.8 %

x g/mol= 381.093 g/mol

In 381.093 g of hydrate, we have 201.217 g of anhydrous Na2B4O7 , the rest of the mass is water.

381.093g−201.217g= 179.876 g of water

Molar mass of H = 1.008 g/mol

Molar mass of O = 15.999 g/mol

Molar mass of  H2O= 1.008 g/mol+ 15.999g/mol  = 18.015 g/mol

179.876g ÷18.015 = 9.98= 10 moles of water per mole of hydrate.

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We used both the hydrogen and water coefficients from the aforesaid solution (mole ratio).

Chemical Reaction

\(2H_{2}\) + \(O_{2}\)  → \(2H_{2}O (Balanced)\)  

Assuming moles of hydrogen are the limiting reactant, calculate the moles of water

\(moles H_{2}O = (4 moles H_{2} ) \frac{2moles H_{2}O }{2moles H_{2} } = 4 moles H_{2}O\)

What is Moles?

A substance's mass, which is made up of the same number of essential components, is measured in moles. A 12 gram example has atoms that are the same as 12C. The basic building blocks of a substance could be molecules, atoms, or formula units.

The quantity of chemical elements is indicated by the mole fraction. One mole of any substance has a value of 6.023 x 1023. (Avogadro number). The byproducts of the chemical reaction can be measured using it. The unit is denoted by the sign mol.

The following expression represents the number of moles formula

Number of moles = Mass of substance / Mass of one mole .

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Answer:

ight i'll answer both rq

Explanation:

a. Rub the magnet along the nail or knitting needle. Now try picking up the paper clip or

tack. Could your nail pick it up? How many can it pick up at once?

after rubbing the magnet with the nail, it could pick up 7 small paper clips.

b. Now try to make your magnet stronger by rubbing the magnet along the nail or knitting

needle for a longer time. Rub only in one direction, not back and forth. This will increase

the number of atoms that line up with the magnet. Try to pick up paper clips or

thumbtacks. How many can it pick up now?

after rubbing it a second time but for a longer period, it could pick up around 10, almost lifting the 11th.

Answer:

A. After rubbing the magnet with the nail, it could pick up 7 small paper clips.

B. After rubbing it a second time but for a longer period, it could pick up around 10 small paper clips, almost lifting the 11th one.

Answer:

The Earth formed billions of years after the Universe formed

Explanation:

The "universe" is said to have been formed billions of year ago through an explosion. This was called the "Big Bang Theory." This lead to the expansion of the universe owing to its high temperature and density. After which, the universe cooled down. Galaxies and stars were then formed. Some of the stars died due to explosion, which then led to the creation of planets. Such formation of the planets happened around 4.5 billion years ago. This is 9.3 billions of years later than the universe was formed (13.8 billions of years ago). So, this explains the answer.

A substantial imbalance between demand and response capability under conditions in which failure has important consequences refers to STRESS. It may affect the functioning of a biological system.

Homeostasis refers to the state of internal (steady) equilibrium, which is required for the normal functioning of a biological system.

Conversely, stress can be defined as any environmental factor (e.g., excessive temperature condition) which is directly affecting the normal functioning of an organism.

Stress may lead to the loss of the homeostatic state when conditions cannot be supported by the organism.

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The most frequent form of buffer overflow attack, called a stack overflow, involves a buffer overflow in the top of the stack. This kind of attack targets information on the heap, an open memory pool.

When a hacker takes advantage of the code mistake to carry out a malicious action and breach the affected system, it is called a buffer overflow attack. The hacker changes the app's execution path and overwrites some of its memory.

When more data is loaded into a fixed-length memory than the reader can hold, it overflows or overruns. which, by overflowing into neighboring memory space, corrupts or overwrites the data stored in that region, which must go someplace.

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Explanation:

 Calcium is the element that has 2 valence electrons.

Answer:

See the answer below

Explanation:

When silver is added to dilute sulphuric acid, no reaction would occur. However, silver reacts with hot and concentrated sulphuric acid to produce silver sulphate, sulphur dioxide, and water.

The equation of the reaction is as below:

silver + sulphuric acid --> silver sulphate + water + sulphur dioxide

\(2Ag(s) + 2 H_2SO_4(aq) -->Ag_2SO_4 (s) + 2 H_2O (l) + SO_2 (aq)\)

The element is Neon
The protons is the same as the atomic number (10 protons)
The electrons are the same as the number of protons in a neutral atom (10 electrons)
The neutrons can be found by subtracting the protons from the atomic mass (22-10=12 neutrons)

Answer:

14 electrons are in that atom

According to the given picture:

A represents the atomic number.

B represents the chemical symbol.

C represents the atomic mass.

D represents the name of the element.