The bond enthalpy of F2(g) is 156.9 kJ/mol. Calculate ΔH o f for F(g).

Based on the given frequency of the wave, the wavelength of the wave is 3.75 * 10⁻⁷ m.

The frequency of a wave is the number of complete oscillations performed by the wave per second.

The wavelength is the distance between successive points on the wave.

The relationship between the wavelength and frequency of a wave is given below:

Wavelength = velocity / frequency

Assuming the given wave is an electromagnetic wave, the velocity of the wave is 3.0 * 10⁸ m/s

Wavelength = 3.0 * 10⁸ m/s / 8.50 * 10¹⁴ s⁻¹

Wavelength = 3.75 * 10⁻⁷ m

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The metals known as Alkaline Earth metals are Na, Mg, or Ca. They are known as "alkaline" earth metals because when they interact with water, they produce "alkaline" hydroxides solutions.

Any of the six chemical elements that make up Group 2 (II a) of the periodic table is an alkaline-earth metal. Beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium are the constituent elements (Ra).

The alkaline earth oxides, formerly known as beryllia, magnesia, lime, strontium, and baryta, are what give the alkaline earth metals their name. These oxides turn basic when combined with water (alkaline).

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From the general gas equation, the volume of the same sample of gas at STP will be closest to the volume at 350 K and 1 atm multiplied by 273/350; option D.

The relationship between the volume, temperature, and pressure of a gas is given by the general gas equation below:

P₁V₁ / T₁ = P₂V₂ / T₂

Where;

P₁ = initial pressure

V₁ = initial volume

T₁ = initial temperature

P₂ = final pressure

V₂ = final volume

T₂ = final temperature

Solving for V₂;

V₂ = P₁V₁T₂ / P₂T₁

V₂ = 350 * 1 * 273/350

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The molar mass of the gas is obtained as 32.1 g/mol.

The molar mass has to do with the mass one mole of a substance. We know that according to the question, we can be able to obtain the number of moles of the compound from the ideal gas equation.

This is how we are able to get the number of moles of the gas as 0.14 moles. Now we need to use the information that we have to get the molar mass of the gass.

Number of moles = mass/ molar mass

Molar mass = mass/Number of moles

Molar mass =  4.5g/0.14  moles

= 32.1 g/mol

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Explanation:

Write a short report describing your ideas for a school of the future. You can suggest changes to:

• school buildings and classrooms.

• the library

• the cafeteria

• how classes are taught.

Give a reason for each of your suggestions. Use a variety of synonyms and accurate vocabulary.

200 words only

The unique property of the orbitals around the nucleus of an atom is that each orbital has electrons of a specific energy level; option B.

Orbitals in an atom are regions of space around which electrons are found in an atom.

The orbitals in an atom are also described as energy levels.

Electrons are arranged in atomic orbitals from orbitals having the lowest energy to orbitals having the greatest energy.

The outermost orbital of an atom is known as the valence orbital and electrons found there are known as valence electrons.

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12500 joule heat is released when an acetylene (C2H2) torch burns 250 grams of fuel

q=ΔnH

H  acetylene = -1300 kJ/mo

n=given mass/molar mass

given mass= 250 g

molar mass=26

n= 250/26

n=9.61

q=ΔnH

q=9.61× -1300 kJ/mo

q=-12500 joule

In thermodynamics, heat has a very specific definition that is different from how we generally use the word. When two systems with various surface temperatures come into touch with one another, heat is the thermal energy that is transferred. The letters q or Q stand for heat, which is measured in joules.

Heat is sometimes referred to as a process quantity since it is defined in the context of a process through which energy can be conveyed. We may talk about the heat that a hot cup of coffee imparts to your hand, but we don't talk about the heat that a cup of coffee itself holds. Heat is yet another noteworthy quality.

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The formula of the hydrate would be  [tex]MgSO_4.6H_2O[/tex].

In order to get the formula of the hydrated salt, the empirical formula method can be used to know the mole of the salt and that of the water.

The formula of magnesium sulfate = [tex]MgSO_4[/tex]

The formula of water = [tex]H_2O[/tex]

Mass of hydrated magnesium sulfate = 18.00 g

Mass of anhydrous magnesium salt = 9.211g

Mass of water = 18 - 9.211

                      = 8.789 g

Now, let's find the mole equivalent of each component:

Molar mass of magnesium sulfate = 120.366 a/mol

Molar mass of water = 18.01 g/mol

Mole of magnesium sulfate anhydrous = 9.211/120.366

                                                                 = 0.0765 mole

Mole of water = 8.789/18.01

                       = 0.4880 mole

Now, let's divide by the lowest mole:

Magnesium sulfate = 0.0765/0.0765

                                 = 1

Water = 0.4880/0.0765

           = 6.37

Thus, the mole ratio of magnesium sulfate and water of hydrate is 6 to 1. Therefore, the formula of the hydrated salt would be [tex]MgSO_4.6H_2O[/tex].

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Answer:

The answer is 117.

Explanation:

There’s not really a way to calculate atomic radius. It comes from empirical data and is in the periodic table. The only way I can think of is Bohr’s radius constant.

₀ = 4₀(ℎ bar)²/_e (_e)²

Calculating atomic radius can get complicated so it’s best to leave it at this.

The specific heat of a 95.01 g piece of an unknown metal that exhibits a 45.2°C temperature change upon absorbing 1870 J of heat is 0.44J/g°C.

The specific heat capacity of a metal can be calculated using the following:

Q = mc∆T

Where;

According to this question, a 95.01 g piece of an unknown metal exhibits a 45.2°C temperature change upon absorbing 1870 J of heat. The specific heat capacity can be calculated as follows:

1870 = 95.01 × c × 45.2

1870 = 4294.452c

c = 0.44J/g°C

Therefore, 0.44J/g°C is the specific heat capacity of the metal.

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The volume of oxygen is 14.7 litres.

What is volume?

volume is a measure of occupied three dimensional space.

Sol-Balanced chemical reaction: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O.

m(C₃H₈-propane) = 5.53 g.

n(C₃H₈) = m(C₃H₈) ÷ M(C₃H₈).

n(C₃H₈) = 5.53 g ÷ 44.1 g/mol.

n(C₃H₈) = 0.125 mol.

From chemical reaction: n(C₃H₈) : n(O₂) = 1 : 5.

n(O₂) = 0.625 mol.

T = 25° = 298.15K.

p = 1.04 atm.

R = 0.08206 L·atm/mol·K.

Ideal gas law: p·V = n·R·T .

V(O₂) = n·R·T / p.

V(O₂) = 0.625 mol · 0.08206 L·atm/mol·K · 298.15 K / 1.04 atm.

V(O₂) = 14.7 L.

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Volume the fluorine gas occupies = 0.73L

What is volume of a gas ?

The gas's volume:

The area occupied by gaseous particles under normal temperature and pressure circumstances is referred to as the volume of gas.

It is identified as a "V."

The letter "L" stands for "liters," the SI unit of volume.

At normal temperature, a mole of gas has a volume of 24 m3, or 24 000 cm3.

The molar volume of a gas is the name given to this quantity.

The gas equation

PV = n R T

P = pressure = 2.04 atm

T = temperature = 5.20 Celsius = 278.20K

V = volume

n = no of moles = 1.24/19 = 0.065moles

R = gas constant = 0.0821lit atm /K

V = 0.065*0.082*278.20/ 2.04 =  0.73L

Volume the fluorine gas occupies = 0.73L

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From the Henderson- Hasselbalch equation, the pH of a solution is 3.36.

The pH of a solution made from a weak acid and its conjugate base can be calculated using the Henderson- Hasselbalch equation.

The Henderson- Hasselbalch equation is given below as follows:

where;

pKa of HF = 3.8

[A⁻] = 0.21 M

[HA] = 0.57 M

pH = 3.8 + log (0.21/0.57)

pH = 3.36

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Answer:

0.40 mole of A

Explanation:

1 mole of A to produce 2 moles of C

so the number of mole of A to produce 0.80 mole of C is:

(0.80 x 1)/(2) = 0.40 mole

Having disposal sites where people can safely dispose of medications, household cleaners and waste instead of pouring them down their sink drains impacts the environment by reducing water pollution.

What is water pollution?

Pouring chemicals down the drain poses the most immediate risk of water pollution. Chemicals are harmful for consumption by all living things when they are dumped down the drain because of the effects they have on our rivers, lakes, streams, and other water supplies.

In regions where contamination is happening, human health might suffer, which can cause serious health problems. Animals and plants that are given contaminated water get sick and die, which has an impact on agriculture as well.

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The amount of acetylsalicylic acid in the tablet is 0.001389 moles and the number of hydrogen atoms in the amount of acetylsalicylic acid in the tablet is 6.69 × 10²¹.

(a)

The formula of acetylsalicylic acid is C₉H₈O₄.

Molar mass of C₉H₈O₄ = 9 × atomic mass of C + 8 × atomic mass of H + 4 × atomic mass of O

                                      = 9 × 12 + 8 × 1 + 4 × 16

                                      = 108 + 8 + 64

                                      = 180

No of moles of acetylsalicylic acid = Given mass / molar mass

                                                         = 0.25 / 180

                                                         = 0.001389

Hence, the number of moles of acetylsalicylic acid is 0.001389 moles.

(b)

Number of hydrogen atoms present in 1 mole of acetylsalicylic acid = 6.023 × 10²³ atoms

Number of hydrogen atom present in 0.001389 moles of acetylsalicylic acid = 0.001389 × 6.023 × 10²³ = 0.008365 = 8.36 × 10²⁰ atoms.

Now there are 8 hydrogen atoms in acetylsalicylic acid so,

Number of atoms of hydrogen in acetylsalicylic acid = 8 × 8.36 × 10²⁰ atoms = 6.69 × 10²¹ atoms.

Hence, the number of atoms of hydrogen in 0.001389 moles of acetylsalicylic acid is 6.69 × 10²¹ atoms.

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The equilibrium constant K of the electrochemical cell is 2.976.

The equilibrium constant of a chemical reaction is described as the value of its reaction quotient at chemical equilibrium, a state approached by a dynamic chemical system after sufficient time has elapsed at which its composition has no measurable tendency towards further change.

We have that:

ΔG = -nFE°cell

n = 2

Force value = 96,500 J/(V･mol)

E°cell = +0.0140 V

ΔG = -(2 *  96,500  * 0.0140)

ΔG = -2702 J

Then,

But;

ΔG = -R TlnK

lnK = -(ΔG/RT)

The value of K = e^[-(ΔG/RT))

The value of K = e^[-(( -2702)/8.314 * 298]

The value of K = 2.976

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1. Baking cookies in the oven is an example of how energy is conserved.

2. Electrical energy is neither transformed nor transferred.

3. Thermal energy either moves from one object to another as it is transferred or changes into a different form as it is transformed.

Baking is the process of cooking with dry heat, particularly in an oven. It is most likely the oldest type of cooking. Bakery goods including bread, rolls, cookies, pies, pastries, and muffins are typically made with flour or meal that comes from grains of some kind.

The stages of the ingredients originally start out in distinct states (e.g., flour is solid, eggs are liquid, etc.), and they change several times as the cookies bake. When they are combined to create cookie dough, a state known as a colloid results (like a mix between solid and liquid). Eventually, the cookies reach a solid state when baking is.

Thus, Baking cookies in the oven is an example of how energy is conserved . Electrical energy is neither transferred or transformed . Thermal energy either moves from one object to another as it is transferred or changes into a different form as it is transformed.

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Answer:

It is definitely friction

To solve such this we must know the concept of chemical reaction and concept of limiting agent. Therefore, C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H is limiting agent in the given balanced equation.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

The balanced reaction is

3 C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H + Al(OH)[tex]_3[/tex][tex]\rightarrow[/tex]

The limiting reagent depends on the mole ratio and not on the masses of the reactants present. 1 mole of  Al(OH)[tex]_3[/tex] need 3 moles of 3 C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H. So, C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H is limiting reagent.

Therefore, C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H is limiting reagent.

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The temperature is obtained as  1517 K.

We know that we asked here to find the temperature at which we are going to have a diffusion coefficient of 2.1 × 10−14 m2/s. Let us look at the following from the question;

D = diffusion coefficient = 2.1 × 10−14 m2/s

[tex]D_{o}[/tex] = pre-exponential constant = 1.1 × 10−5 m2/s

[tex]E_{a}[/tex] = Activation energy = 253,300 J/mol

R = Gas constant = 8.314 J/mol.K

T = temperature = ??

Then;

log D= log  [tex]D_{o}[/tex] - Ea/2.303RT

log(2.1 × 10−14) = log( 1.1 × 10−5) - 253,300/2.303 * 8.314 * T

log(2.1 × 10−14) / log( 1.1 × 10−5) = - 253,300/2.303 * 8.314 * T

T = - 253,300/-8.719 * 2.303 * 8.314

T= 1517 K

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The mass percentage of HCl 11,900x/118 g and molality of solution is   9.915 mol L^-1.

Molarity = 11.8 M

Molarity = (moles of HCl) / (litres of solution)

Molality = (moles of HCl) / (kilograms of solvent)

=> Let number of moles of HCl present be x moles.

So, 11.8 = x/litres of solution

litres of solution = x/11.8 litres.

So, volume in mL = x/11.8 * 1000 mL =>10,000x/118 mL

Density of solution = 1.19 g/ml

So, D = m/v

Mass of solution = D * v => 1.19 * 10,000x/118 => 11,900x/118 g

=> (11,900x/118)/1000 L => 11.9x/118 litres

Moles of HCl = x moles.

Molality = x/( 11.9x/118)

=> 118x/11.9x => 118/11.9 => 9.9156 mol L-1

=> Molality of solution = 9.915 mol L-1 (approx.)

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The wavelength of the cosmic ray when the frequency is 2.3 x 10^24 Hz is 1.304 x 10^-7 nm.

What is wavelength?

Wavelength in a wave is the distance between any given point on a wave and the same point on the adjacent wave that is crest to crest or trough to trough. It can be measured in the direction of the given wave.

The wavelength in nm of the cosmic ray can be calculated as,

λ = c / ν

where λ is the wavelength, ν is frequency in Hz or s^-1 and c is velocity of light.

λ = (3 x 10^8 m/s) / 2.3 x 10^24 Hz = 1.304 x 10^-16 m = 1.304 x 10^-7 nm.

Therefore, the wavelength of the cosmic ray when the frequency is 2.3 x 10^24 Hz is 1.304 x 10^-7 nm.

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The structure of the compound that have been described in the question is shown in the image attached to this answer.

We know that in organic chemistry, the structure of a molecule is very instrumental to the way that the molecule would be able to undergo reaction. In this case, we have a compound that is said to have  5 carbons, 3 chlorine group side chains, and one propyl group side chain.

Our key task is first to visualize the molecule and they try to create the structure of the molecule. As we try to create the structure of the molecule, we must have in mind the tetravalence of carbon. That is, carbon can only form four bonds to itself.

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The mass of wood before burning does not always equal the mass of the resulting ashes after burning because some other products have been produced and lost.

When wood burns, a form of chemical change takes place and the reaction is reversible.

The products of wood burning include ashes, carbon dioxide, and water vapor. However, only ashes remain after burning because carbon dioxide and water vapor both escape into the atmosphere.

The escape of some of the products of burning into the atmosphere is one of the reasons the reaction seems to negate the law of conservation of mass.

According to the law of conservation of mass, masses are conserved during reactions but can be converted to different forms. Thus, if ashes were to be the only product of the burning of wood, then the mass of the ashes formed must be equivalent to the mass of the wood.

However, due to the formation of other products that happen to always escape into the air, the mass of ashes is not always equal to the mass of the woods that burn.

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The following is involved in bonding between atoms is electron

There are four type of chemical bonds essential for life to exist and it is ionic bond, covalent bond, hydrogen bond, and Vander wall interaction and all of these are different kind of bond to play various role in biochemical interaction and the electron on the outermost energy level of the atom are called valence electron and the valence electron are involved in bonding one atom yo another

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Considering the definition of percent by mass, the correct answer is the third option: the correct formula to calculate percent by mass is [Mass of solute (g) ÷ mass of solution (g)] × 100

The percent by mass is a measure of the amount of mass that an element occupies in a compound and it is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.

To calculate the percentage of composition, it is necessary to know the mass of the element in a known mass of the compound.

So, the percent by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage:

percent by mass= [Mass of solute (g) ÷ mass of solution (g)] × 100

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The molecular structure of the fat is changed when lipids like cholesterol are exposed to hydrogenation.

What is cholesterol?
Any member of the lipids class of specific chemical compounds is a kind of cholesterol. It is a sterol, a class of lipid (or modified steroid).  All animal cells produce cholesterol, which is a crucial part of the membranes that make up those cells. It is a yellowish crystalline solid when chemically separated. It is possible to increase the saturation of fatty acids by adding hydrogen to unsaturated fatty acid chains, which connects the hydrogen atoms to the saturation sites.

Hence, the molecular structure of the fat is changed when lipids like cholesterol are exposed to hydrogenation.

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Answer:

298k

Explanation:

because 298k is lower than 302k

When metals and non metals combine in fixed proportion then a chemical compound is formed So, the compound that will be formed from group 13 elements and group 17 is AlCl₃.

Chemical formula is a formula where cation and anion combine to form a molecule in fixed proportion. Metals combine in form of cation and non metals combine in form of anion.

Cation is the species that give electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state. the compound that will be formed from group 13 elements and group 17 is AlCl₃.

Therefore, the correct option is option A.

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