Why is this on hear if people give you the wrong answers?!?

The first step to solve this question is to convert the given amount of grams of Fe to moles using its molecular weight.

According to the given reaction, 4 moles of Fe produce 2 moles of Fe2O3. Use this ratio to find how many moles of Fe2O3 are formed:

Convert this amount of moles to grams using Fe2O3 molar mass:

It means that 23.9 grams of Fe2O3 are formed.

Based on the heat of solution, the increase in temperature rise when an 8.54 g solid sample of sodium hydroxide is dissolved in 111.5 g of water in a coffee cup calorimeter is 95.48 K.

The increase in temperature rise when an 8.54 g solid sample of sodium hydroxide is dissolved in 111.5 g of water in a coffee cup calorimeter is determined using the formula below:

mass of water = 111.5 g

c = 4.18 J/g.K

Heat of solution, ΔH = 44.5 kJ/mol

ΔT = ?

Mole of NaOH in 8.54 g NaOH = 8.54/40

Mole of NaOH in 8.54 g NaOH= 0.2135 mol of NaOH

Solving for ΔT;

44.5 kJ/mol = 111.5 * 4.18 * ΔT

44.5 kJ/mol = 466.07 * ΔT

ΔT = 44.5 / 466.07

ΔT = 95.48 K

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The mass of the peanut butter that you took out of the container is 34.1 ounces

The conversion factor is the manner in which we are able to change a value from one unit to another, Let us recall that there could be several units that could be used for a particular calculation and many times it is necessary to convert a value from one of the units to another for ease of calculation.

Mass of the crunchy butter =  1.26 kg

Percent used = 7.7%

Mass of the  crunchy butter used =  7.7/100 * 1.26 kg = 0.97 Kg

To convert to ounces;

0.97 Kg * 35.247 ounces/1 Kg

= 34.1 ounces

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Interpretation of equation for a chemical reaction using the coefficients

On the particulate level: 1 molecule of N₂(g) reacts with 1 molecule of 2O₂(g) to form 2 molecules of NO₂(g).

On the molar level: 1 mole of N₂(g) reacts with 1 mole of 2O₂(g) to form 2 moles of NO₂(g).

chemical reaction: a process in which one or more substances—the reactants—are changed into one or more additional substances—the products. Chemical elements and compounds are both substances. To produce different substances as products, a chemical reaction rearranges the atoms that make up the reactants. Technology, culture, and life itself are all influenced by chemical reactions.

Numerous activities that involve chemical reactions have been known and used for thousands of years, including burning fuels, smelting iron, creating glass and pottery, brewing beer, and producing wine and cheese.

Numerous intricate processes that take place in all living systems, as well as the Earth's geology, atmosphere, and oceans, involve chemical reactions.

We have given the following chemical reactions

N₂(g) + 2O₂(g) → 2NO₂(g)

The changes in two levels, the particulate level and the molar level, can be  interpret using the balanced equation.

On the particulate level, we always consider discrete molecules.

On the particulate level: 1 molecule of N₂(g) reacts with 1 molecule of 2O₂(g) to form 2 molecules of NO₂(g).

We think in terms of moles On the molar level, considering 1 mole of particles = 6.02 × 10²³ particles.

On the molar level: 1 mole of N₂(g) reacts with 1 mole of 2O₂(g) to form 2 moles of NO₂(g).

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The balanced equation is

4 KO2(s) + 2 CO2(g) = 2 K2CO3(s) + 3 O2(g).

The law of conservation of mass states that the mass of the reactants and products of a chemical reaction should be equal. The amount of atoms for each element doesn't really increase as a consequence of the chemical reaction. Thus, the chemical equation illustrating the chemical process must be balanced. A chemical equation is said to be balanced when the number of atoms involved on the reactants and products sides are equal.

Here are the steps we need to do in order to balance an equation:

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0.008134 moles of N are in 0.179 g of N₂O.

1mole = 6.022 ×1023 number of moles of atoms or molecules or ions

Number of moles = Mass /molar mass

Number of moles of N2O = 0.179g/44.014g/mol = 0.004067mol

one mole of N2O contains two moles of N

Number of moles of N = 2× 0.004067 = 0.008134  moles.

The mole fraction can be calculated by dividing the number of moles of one factor in the reaction by  the total number of moles of all impurities in the  solution. It should be noted that the sum of the mole fractions of all  components of the solution must be equal to one.

A mole fraction is a unit of attention.  the relative amount of solute and solvent in the reaction is measured as a mole fraction and reported. Mole fraction is the wide range of moles of a given substance in solution divided by  the total range of moles.

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The density in g/cm³ of an unknown metal alloy sample is 11.784g.

Mass per unit volume is the definition of density for a material. The ratio of mass to volume, or mass per unit volume, is what is meant by density. It gauges the amount of "stuff" contained within an object in relation to its volume (cubic meter or cubic centimeter). The degree to which matter is packed together firmly is fundamentally measured by density. The Greek scholar Archimedes is credited with discovering the principle of density. If you know the formula and are familiar with the relevant units, you can calculate the principle of density with ease. The formula for determining density is to take an object's mass (m) and divide it by its volume (v): = m / v. Density is typically denoted by the Greek symbol "."

The SI unit for density is the kilogram per cubic meter (kg/m3). centimeter (g/cm3).

Mass of clean pycnometer = 25.151 g

Mass of clean pycnometer plus water = 42.481 g

Mass of clean pycnometer plus metal sample = 39.605 g

Mass of clean pycnometer plus metal plus water = 54.265 g

54.265 g - 42.481 g

= 11.784 g

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The pressure (in mmHg) at 45,000 m, given it was 755 mmHg at launch is 0.669 mmHg

The folloeing data were obtained from the question:

The new pressure of the gas at 45000 m can be obtained by using the combined gas equation as illustrated below:

P₁V₁ / T₁ = P₂V₂ / T₂

(755 × 125) / 300 = (P₂ × 94000) / 200

Cross multiply

P₂ × 94000 × 300 = 755 × 125 × 200

P₂ × 28200000 = 18875000

Divide both sides by 28200000

P₂ = 18875000 / 28200000

P₂ = 0.669 mmHg

From the calculation made above, we can conclude that the pressure at 45000 m is 0.669 mmHg

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1. The behavior of submicroscopic particles can sometimes be described as waves - True

2. Quantum mechanics limits us to making statistical statements about the location of an electron in an atom - True

3. The uncertainty principle is important only for particles of very small mass, such as the electron - True

Quantum mechanics is the branch of science that deals with the particles that we have in the atom. The study of quantum mechanics led us to appreciate the position of the electrons that are found in the atom.

The spear head of the study of quantum approach to the atom was Erwin Schrodinger when he proposed the wave mechanical model of the atom.

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The mass of water  produced in the oxidation reaction is 2.5 g.

Oxidation reaction of ethanol occurs when ethanol comes in contact with oxygen, producing water and acetic acid. This type of reaction can also produce carbon dioxide and water.

The oxidation reaction of ethanol and oxygen is given as;

CH₃CH₂OH  + O₂  -----------> H₂O  +  CH₃COOH

Molecular mass of ethanol;

CH₃CH₂OH = (12) + (3 x 1) + (12) + (2 x 1) + (16) + (1) = 46 g/mol

Molecular mass of water;

H₂O  = (2 x 1) + (16) = 18 g/mol

From the reaction above, we can infer the following;

46 g of ethanol ---------> 18 g of water

6.5 g of ethanol ---------?

= (6.5 x 18) / 46

= 2.54 g of water

Thus, the mass of water that is produced by the reaction of 6.5g of ethanol is 2.5 g.

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Answer: ionic bond

Explanation:

An unknown substance has a specific heat capacity of 2.22 J/g °C. If 92.3 grams are heated with 1,760.0 joules of energy the change in temperature be will be 360°C

Specific heat is defined by the amount of heat needed to raise the temperature of 1 gram of a substance 1 degree celsius (°C)

Here given data is unknown substance

Specific heat capacity means Q =  2.22 J/g °C

Mass = 92.3 grams and

C = 1,760.0 joules and

We have to calculate change in temperature = ?

So the formula is Q = mc×ΔT

2.22 J/g °C = 92.3 ×1,760.0 joules×ΔT

ΔT = 360°C

So the change in temperature be360°C

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70.33 L  is the volume of 10 moles of a gas at 300 K held at a pressure of 3.5 atm.

Volume is the percentage of a liquid, solid, or gas's three-dimensional space that it occupies.

Liters, cubic metres, gallons, millilitres, teaspoons, and ounces are some of the more popular units used to express volume, though there are many others.

We will use ideal gas law to find the volume

PV = nRT

Can also be written as

V = (nRT)/P

Where,

P = pressure

V = volume

n = amount of substance

R = ideal gas constant

T = temperature

Here, we have given

P = 3.5 atm

V = to find

n = 10 moles

R = 0.08206 L⋅atm/K⋅mol

T = 300k

Lets substitute the values

V = (10 × 0.08206 × 300)/3.5

V =  70.33 L

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The volume (in cm) does a 26.0 g piece of Cu is 2.90 cm³.

Density is the substance's mass in keeping with a unit of volume. The image most often used for density is ρ, despite the fact that the Latin letter D also can be used. Mathematically, density is defined as mass divided by volume.

Mass, extent, and density are three of an object's maximum simple residences. Mass is how heavy something is, quantity tells you how big it is, and density is mass divided through volume. although mass and extent are houses you deal with each day, the concept of density is a little much less obvious and takes a cautious idea.

The components for density are the mass of an object divided by means of its volume. In equation shape, it is d = m/v, in which d is the density, m is the mass and v is the volume of the object. the standard devices are kg/m³.

Density = mass / volume

Volume = mass/density

             = 26/8.96

             = 2.90 cm³

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The dissociation constant of Ka is 7.83 × 10³ .

In chemistry, the molar mass of a chemical compound is determined by dividing its mass by the quantity of the material, or the number of moles in the sample, expressed in moles. A substance's molar mass is a bulk attribute, not a molecular one. Mass per mole is one way to define molar mass. Molar mass is, in other words, the total mass of all the atoms in a substance that makes up a mole. It is quantified in grams per mole.

Molar mass is shown for substances or molecules. The molar mass of a single element or atom would simply be that element's mass represented in atomic mass units.

Mass of HN[tex]O_{2}[/tex] = 1.93g

Volume of solution = 500 ml

[tex]H^{+}[/tex] equilibrium = 7.63 × [tex]10^{3}[/tex] m

Molarity of HN[tex]O_{2}[/tex] = mol [tex]HNO_{2}[/tex] /vol in2

mol [tex]HNO_{2}[/tex]

= mass(g) / molar mass

= 1.93/42.0129 g/mol

= 0.04105

Hence ,

molarity of HNO2

= 0.04105/0.5L

= 0.0821 M

Reaction

HNO2 ⇄ H+  NO2

x = [tex]H^{+[/tex] = 7.63 × [tex]10^{3}[/tex] M

= 0.0821 - 7.63 [tex]10^{3}[/tex]

= 0.0821 - 0.00763

= 0.0745 m

[tex]H^{+}[/tex] = 7.63 × [tex]10^{3}[/tex]

[tex]NO_{2}[/tex]  = x = 7.63 × [tex]10^{}[/tex]³

Dissociation of constant ka

ka = [tex]H ^{+} NO_{2} ^{-}[/tex]/ HNO²

=[tex]10^{3}[/tex]  × 7.83

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The heat made by a mixture of gases is less than that produced by solitary gases of hydrogen or oxygen.

The property becomes a solution of a homogeneous mixture. Some of the effects of gas mixtures are easy to control. if we know the composition of the gases in the mix. In gas mixtures, all components in the gas phase can be used separately. The atmosphere is a mixture of different gases. The part, usually present in solution, first has to be atomized in a flame. Premixed combustion flame, a mixture of fuel and oxidant gas, and diffusion. compared to liquid streams, is relatively simple because the bulk characterization of a single phase is implicit. However, when gas. The heat produced by a mixture of gases is less than that produced by solitary gases. of hydrogen or oxygen.

so we can conclude that the flame appears yellow if there are impurities in the air whereas a pure hydrogen gas flame will not produce any smoke.

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Answer:

1. Fe: 26, 26, 30

2. Rh: 45, 45, 58

3. Sr: 38, 38, 50

4. Li: 3, 3, 4

5. Bi: 83, 83, 126

Explanation:

Protons = electrons = atomic number

Atomic mass - atomic number = neutron

Electron configuration notation describes an atom in an excited state as [Ar]4s²3d84p¹. Option D.

An electron is in an excited state when it temporarily occupies a higher energy state than its ground state. Electrons are excited when additional energy is supplied. When it absorbs a photon or packet of light or collides with a nearby atom or particle.

When an electron absorbs energy and shifts from a lower energy orbital to a higher energy atomic orbital the atom assumes an exciting electronic configuration. Usually an unstable electronic configuration. As a result, the electron returns to the ground state and releases a certain amount of energy. Ground state means the state with the lowest energy. When an electron absorbs energy and pops into an outer orbit, this state is called an excited state.

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There's no increase in the kinetic energies of the particles, and hence no rise in temperature, because the energy required for phase shifts is employed to break bonds.

If the pressure around a solid, liquid, or gas stays constant throughout a phase shift, the temperature will not change. In other words, once a liquid hits its boiling point, the temperature won't rise any further until the entire volume of the liquid has transformed into a gas.

As a solid transforms into a liquid during a phase change, its temperature stays constant because the heat energy is converted to potential energy. Similarly, when heat is supplied to a liquid, the temperature rises as the molecules once more move more quickly.

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Urea is a nonelectrolyte.

A material that conducts electricity poorly and does not easily ionize when dissolved or melted.

Chemical substances that don't conduct electricity in any condition are called non-electrolytes. As a result, current does not flow through the solution since it does not add ions to it. Naphthalene, latex, and sugar solution are a few examples of covalent compounds that are not electrolytes. An object is an electrolyte if it is electrically conductive when it is liquid or dissolved. It is a nonelectrolyte if it does not conduct electricity while it is a liquid. In an aqueous solution, nonelectrolytes—such as sugar, alcohol, and many organic compounds—occur as uncharged molecules and do not conduct electrical current.

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Answer:

wetting and drying

cultivation

freezing and thawing

particle size

Earthworm

The molarity of the 20 mL H₂SO₄ solution required for the titration is 0.0388 M

We can obtain the molarity of the H₂SO₄ solution by doing the following:

H₂SO₄ + 2LiOH —> Li₂SO₄ + 2H₂O

The mole ratio of the acid and base obtained from the equation is:

From the question given, we obtained the following:

MaVa / MbVb = nA / nB

(Ma × 20) / (0.1 × 15.5) = 1 / 2

(Ma × 20) / 1.55 = 1 / 2

Cross multiply

Ma × 20 × 2 = 1.55

Ma × 40 = 1.55

Divide both side by 40

Ma = 1.55 / 40

Ma = 0.0388 M

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The area of this flag in square centimeters is 10.58 × [tex]10^{7} cm^{2}[/tex].

The quantity of unit squares that fit inside a shape determines its area. A unit square is a square having a side of one unit, as "unit" here denotes one (1). The total number of unit squares that are contained within a rectangle's perimeter is hence its area. Or, you can refer to the area of the rectangle as the region included within the rectangle's envelope. The rectangular tiles that make up your home are a fantastic illustration of form. The number of tiles on the floor makes it simple to calculate how much area it takes up. You may calculate the rectangle's area using this as well. A number of unit squares equal the area of a rectangle.

Area of flag = area of a rectangle

= l × b

=  1.26 × [tex]10^{4}[/tex]   ×   8.40 ×[tex]10^{3}[/tex]

= 10.58 × [tex]10^{7}[/tex] [tex]cm^{2}[/tex]

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Answer:

One mole of oxygen gas, which has the formula O2, has a mass of 32 g and contains 6.02 X 1023 molecules of oxygen but 12.04 X 1023 (2 X 6.02 X 1023) atoms, because each molecule of oxygen contains two oxygen atoms.

The different types of neon with varied numbers of neutrons are best referred to as isotopes.

In chemistry, isotopes are atoms of the same elements. These atoms have the same number of protons in their nuclei. Thus, they have the same atomic number.

However, isotopes of the same elements do not have the same number of neutrons in their nuclei. Thus, isotopes have the same number of protons but different mass numbers because of the difference in the number of neutrons.

Now consider different neon atoms with 10, 11, and 12 neutrons. These atoms are best described as isotopes of neon.

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In argon Fluoride laser used in some reflective eye surgeries of electro magnetic radiation at a wavelength of 193.3nm  then the frequency is 1.72×10⁶Hz

Electromagnetic radiation is the is the form of energy that propagated both as electrical and magnetic waves traveling in packets of energy called photons

Here given data is

Wavelength = 193.3nm

Velocity = 3×10⁸m/sec

We have to find frequency = ?

Then the formula is V = λf

So rearrange this formula

f = V/ λ

f = 3×10⁸m/sec/193.3nm

f = 1.72×10⁶Hz

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The balanced chemical equation for the reaction between butane gas and oxygen gas is as follows: 2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O

Combustion reaction is a process wherein a fuel is combined with oxygen, usually at high temperature, releasing heat.

According to this question, a combustion reaction occurs between butane gas and oxygen gas to form carbon dioxide and water vapor.

2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O

The formula of the reactants of this combustion reaction are as follows; C₄H₁₀ and O₂ while the formula of the products are as follows; CO₂ and H₂O.

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The question requires us to calculate the volume of concentrated HNO3 solution (concentration = 16.0 mol/dm^3) to prepare 100 cm^3 of a 0.50 mol/dm^3 HNO3 solution.

We need to calculate the volume necessary from a concentrated solution to prepare a more dilluted solution. The number of moles of HNO3 in the solutions will not change, thus we can say:

where n is the number of moles of HNO3 and 1 and 2 refers to the initial solution and final solution, respectively.

The number of moles in a solution can be calculated as it follows:

where C is the concentration and V is the volume of the solution.

We can combine these two equations to have the following expression:

With this expression, we can use the values given by the question to calculated the volume of the concentrated solution (V1) necessary to prepare a more dilluted solution:

Therefore, the volume necessary of concentrated HNO3 to prepare 100 cm^3 of 0.50 mol/dm^3 HNO3 solution is 3.12 cm^3.