help me please if you can

The number of moles of MgO produced when 0.20 mole of O₂ reacts completely is 0.40 mole

Mole is the SI unit of amount of substance of a specified elementary entity

Here given data is number of moles of MgO produced when 0.20 mole of O₂ reacts we have to find mole = ?

So the balanced equation is

2Mg + O₂ → 2MgO

So, the number of moles of MgO = (0.20 mol of O₂ )×(2 mol of MgO) / (1 mol of O₂)

= 0.40 mole

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The possible masses of calcium oxide and carbon dioxide that can form when 400g of calcium carbonate undergoes decomposition is

The correct measurement of the element neon (Ne):

When reactants of a reaction are known, the fact that can always be deduced about the products is:

The correct molar mass correct for carbon dioxide (CO₂) is 44.01 g/mol; option B

The number of moles in 43 g of CO₂ is 0,977 moles.

According to the law of conservation of matter, the statement that best describes a balanced chemical equation:

The number of moles of atoms of each element must be the same in the reactants and in the products.

Based on the law of conservation of mass, the product of the reaction of nitrogen gas and hydrogen is 2 NH₃.

To calculate the number of moles from mass, take the quotient of mass and molar mass; option B

The ratio of components in the reaction of sugar with oxygen gas to produce carbon dioxide and water is:

For every 12 moles of CO₂ produced, 2 moles of C₆H₁₂O₆ is needed; option A

The molar mass of NH₄Cl is 53.5 g/mol; option A.

The decomposition of 1 mole of calcium carbonate yields 1 mole of CaO and 1 mole of CO₂ as shown in the equation below:

CaCO₃ ---> CaO + CO₂.

Molar mass of CaCO₃ is 100 g.

400 g of CaCO₃ is equal to 4 moles

4 moles of CaCO₃ produces 4 moles of CaO and CO₂

Mass of 4 moles of CaO = 4 * 56 = 224 g

Mass of 4 moles of CO₂ = 4 * 44 176 g

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There was distilled water in the cuvette when the student put the standard solution in it.

The correct option is A.

The concentration of a solution can be used to determine how much solute has been dissolved in a given quantity of liquid or solution. A concentrated solution is one that has a large concentration of the dissolved solute. If there is only a small amount of dissolved solute in the solution, it is said to be dilute.

In chemistry, a solution's concentration refers to the proportion of a solute that is present in a given amount of solvent or solution. Understanding the solute concentration is necessary for controlling the stoichiometry of reactants in solution reactions.

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The complete question is -

A student uses visible spectrophotometry to determine the concentration of CoCl₂ (aq) in a sample solution. First the student prepares a set of CoCl₂ ( aq) solutions of known concentration. Then the student uses a spectrophotometer to determine the absorbance of each of the standard solutions at a wavelength of 510nm and constructs a standard curve. Finally, the student determines the absorbance of the sample of unknown concentration.

The student made the standard curve above. Which of the following most likely caused the error in the point the student plotted at 0.050 M Co²⁺(aq)?

A-There was distilled water in the cuvette when the student put the standard solution in it.

B-There were a few drops of the 0.100 M Co²⁺(aq) standard solution in the cuvette when the student put the 0.050 M standard solution in it.

C-The student used a cuvette with a longer path length than the cuvette used for the other standard solutions.

D-The student did not run a blank between the 0.050 M Co²⁺(aq) solution and the one before it.

The number of photons is obtained from the calculation as 1.68 * 10^19 photons.

By definition, we know that energy is the ability to do work. Now we know that we have the wavelength of the radiation can be seen from the question and the values that are given to be 3.80 x 10-8 m.

Then energy = hc/λ

h = Plank's constant

c = speed of light

λ = wavelength

E = 6.6 * 10^-34 * 3 * 10^8/ 3.80 x 10^-8

E = 5.2 * 10^-18 J

Energy of the water = mcdT

= 4.48 * 4.2 * 4.65 = 87.5 J

Number of photons required =  87.5 J/5.2 * 10^-18 J

= 1.68 * 10^19 photons

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Answer:

determining the melting point of a substance

Explanation:

Considering the given statements about the filament sliding model in muscles, the statement that is false is;

Muscle filaments or myofilaments are the three protein filaments that make up the myofibrils in muscle cells.

There are three main proteins filaments that make up the myofibrils, and they are:

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Assuming you can't wish for infinite wishes:

1. Hyperintelligence

2. Elite athleticism (within the confines of human limitations of course. So just being a 99th percentile athlete)

3. The ability to summon a delicious steak of any variety at any level of doneness at any moments notice

In certain fireworks, potassium nitrate breaks down into potassium oxide, nitrogen, and oxygen. This is an example of a combustion reaction. The opposite process is a synthesis reaction

fireworks are a class of low explosive devices used for aesthetic and entertainment purposes

Here potassium nitrate is break down into the potassium oxide and nitrogen and oxygen which decomposes is by given burning it is also combustion reaction and the synthesis reaction is opposite to this reaction

2KNO₃ → 2KNO₂ + O₂

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The relationship among force, mass, and acceleration is force equals mass times acceleration. Therefore, option B is correct.

The term acceleration is defined as the rate of change of velocity. When an object moves in a circular path at a constant speed, it is still accelerating because its velocity direction changes.

The application of a net force to an object alters its motion, the greater the net force, the greater the acceleration. More massive objects necessitate greater net forces to accelerate at the same rate as less massive objects.

“Force equals mass times acceleration.” This is because this shows the equation for force, and thus it shows the relationship between them in how they are used.

Thus, option B is correct.

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Asteroids are left over pieces of rocks that didn't become planets or satellites. These are mostly located in The Asteroid Belt in the Solar System.

The main asteroid belt is a region between the orbits of Mars and Jupiter. The Asteroid Belt is a torus shaped region. Some of the asteroids may go in the front or behind the Jupiter.

The Oort cloud has around 2.3% of left over pieces of asteroid rocks. It is a predicted percentage.The asteroids were located in more amount earlier when the interplanetary zones were clearing in the solar system.

The Kuiper Belt has bits of rocks, comets, ice, and the dwarf planets. It is similar to the asteroid belt but it is more complex and larger.

Asteroids are discovered by a systematic search for a planet between Mars and Jupiter in the asteroid belt.

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French toast (the breakfast food) would be an example of molecule because of chemical change.

A molecule is the smallest unit of a material that keeps its content and properties. It is composed of two or more atoms that are joined together by chemical bonds. Chemistry is built upon molecules. The element symbol and a subscript indicating the number many atoms are used to identify molecules.

Atoms interact with each other and with their nuclei when they are close to one another. A molecule is created whenever two or more atoms combine in a way that lowers the state's overall energy.

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In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge.  The correct option is option C

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided.

As it is given that lithium atom is neutral for this number of proton has to be equal to number of electron. The  proton number is 3 that means number of electron is also 3 because proton number  is equal to number of electron and this equals to atomic number.

Therefore there are three electrons in Lithium if it has three proton. The correct option is option C

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Al₃⁺(aq) + 3OH⁻(aq) → Al(OH)₃(s) is the first and Al³⁺(aq) + 3NH₄OH → Al(OH)₃(s) +3NH₄⁻(aq) is the second net ionic equations for the addition of aqueous ammonia to aluminum nitrate

The net ionic equation is the chemical equation that shows only those elements or compounds or ions that are directly involved in the chemical reaction

So, first and second net ionic equations for the addition of aqueous ammonia to aluminum nitrate are

Complete ionic equation is

Al₃(aq) + 3NO₃(aq) + 3NH₄⁻(aq) + 3OH⁻(aq) → Al(OH)₃ (s) + 3NH₄⁺(aq)+ NO₃⁻(aq)

So two net ionic equations are

Al₃⁺(aq) + 3OH⁻(aq) → Al(OH)₃(s)

Al³⁺(aq) + 3NH₄OH → Al(OH)₃(s) +3NH₄⁻(aq)

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The enthalpy of the reaction is obtained as 242 kJ/mol

We define the term enthalpy as the heat that is evolved or absorbed in a chemical process. In this case, heat is evolved when the reaction occurs because a neutralization reaction is necessarily an exothermic reaction. This is because het is given off.

We have been supplied with the amount of that is produced in the process. Hence we have;

Number of moles of sodium metal = 0.442g /23 g/mol = 0.019 moles

Thus, we have the enthalpy as;

H = 4590 * 10^-3 kJ/0.019 moles

= 242 kJ/mol

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Answer: Fe(aq) + S(aq)   yields FeS(s)

Explanation:

Fe+2 + 2Cl-  + 2K+ + S-2  yields  FeS(S) + 2K+ + 2Cl-

Cross out the aqueous ions and you are left with

Fe+2 + S-2  yields  FeS(s).  

The concentration of the methylamine chloride is 0.0000013 M.

We know that the concentration has to do with the amount of the substance that is present. Hence, the question is essentially trying to ask us to be able to find the  the concentration of methylamine chloride in the solution.

[H^+] = Antilog(-0.20) = 0.63 M

Ka = 1 * 10^-14/4.6*10^-4 = 2.22 * 10^-11

Let us first set up the ICE table as shown below;

            CH3NH2(aq)    +  H^+  ⇄  CH3NH3^+(aq)   + OH^-(aq)

I               0.15                   0.63         0                         0                      

C              -x                      -x              +x                        +x

E         0.15 - x                0.63 -x        x                          x

Ka = [CH3NH3^+] [OH^-]/[CH3NH2] [H^+]

2.22 * 10^-11= x^2/[0.15 - x] [0.63 -x ]

2.22 * 10^-11(0.09 -0.15x - 0.63x + x^2) = x^2

2.22 * 10^-11(0.09 - 0.48x +x^2) = x^2

1.9 * 10^-12 - 1.1 * 10^-11x + 2.22 * 10^-11x^2 = x^2

x^2 - 2.22 * 10^-11x^2 +  1.1 * 10^-11x  - 1.9 * 10^-12  = 0

x^2 +  1.1 * 10^-11x  - 1.9 * 10^-12  = 0

x =0.0000013 M

Concentration of the methylamine chloride = 0.0000013 M

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The electron donor is [tex]H_2[/tex].

The electron acceptor is [tex]NAD^+[/tex]

When the electron donor loses the electron, it becomes oxidized.

When the electron acceptor accepts the electron, it becomes reduced.

Overall, the electron travels from H to  [tex]NAD^+[/tex].

Oxidation is defined as:

Reduction is defined as:

Looking at the reaction, [tex]NAD^+[/tex] gained hydrogen or an electron to become NADH. this means that NADH has been reduced. The reducing agent or the electron donor is [tex]H_2[/tex] .

Thus, the electron acceptor is [tex]NAD^+[/tex]. When the electron donor, [tex]H_2[/tex], loses the electron, it becomes oxidized to [tex]H^+[/tex].

When the electron acceptor, [tex]NAD^+[/tex], accepts the electron, it becomes NADH.

This means that electron travels from  [tex]H_2[/tex] to [tex]NAD^+[/tex]

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Answer:

Explanation:

Coal is a cheap and abundant resource, and carbon dioxide (CO2) from coal use is responsible for about 40 percent of global greenhouse gas (GHG) emissions from fossil fuel use.

The equilibrium concentrations of A, B, and C at equilibrium are:

The equilibrium concentrations of A, B, and C are calculated from the equilibrium equation below as follows:

Kc = [C]⁴ /  [A]³ * [B]²  -----(1)

Kc = 1.33 * 10

The initial concentrations of A and B are as follows:

A = 1.80 mol / 1 L = 1.8 M

B = 3.50 mol / 1 L = 3.50 M

The concentrations at equilibrium are given by the ICE table below:

   3 A (g)   +    2 B (g) ⇄ 4 C (g)

I   1.80            3.50           0

C  - 3x           - 2x           + 4x

E  1.80 - 3x   3.50 - 2x    4x

Substituting the concentrations at equilibrium into the equilibrium equation above

1.33 * 10³¹  = 4x⁴ / (1.80 - 3x)³ * (3.50 - 2x)²

x = 0.56

Therefore;

the concentration of A = 1.80 - 3 * 0.56

the concentration of A = 0.12 M

the concentration of B = 3.50 - 2 * 0.56

the concentration of B = 2.38 M

the concentration of C = 4 × 0.56

the concentration of C = 2.24 M

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Answer:

Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.

Explanation:

Not really sure what the problem is, the answer is given in the question.

The question asks "Which compares the effectiveness of methane and nitrous oxide as a greenhouse gas with that of carbon dioxide. Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide."

The first part of the question is "Which compares the effectiveness of methane and nitrous oxide as a greenhouse gas with that of carbon dioxide."

The second part of the question is literally the answer, "Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide."

it could be that you just accidentally pasted the same thing twice, and the original question was just "Which compares the effectiveness of methane and nitrous oxide as a greenhouse gas with that of carbon dioxide."
In that case, remember that the order of greenhouse gas potency is Carbon dioxide, methane, nitrous oxides, chlorofluorocarbons. Thus, nitrous oxide and methane are both more potent than carbon dioxide.

The empirical formula of an organic compound with 24.24% carbon. 4.04% hydrogen, and 71.71% chlorine will be  [tex]CHCl_2[/tex].

If the molar mass of the compound is 148.5, the molecular formula will be  [tex]C_2H_2Cl_4[/tex].

The compound contains:

The mole of each atom can be found by dividing them by their respective molecular weights.

Now, let's divide through by the smallest number of moles

Thus, the empirical formula of the compound is [tex]CHCl_2[/tex].

The molar mass of the empirical formula is calculated as:

12 + 1 + (35.5 x2) = 84 g/mol

Molecular formula = [empirical formula]n

Where n = Molecular formula mass/empirical formula mass

In this case, n = 148.5/84

                       = 1.77 (approximatel 2)

Thus, the molecular formula of the compound is [tex]C_2H_2Cl_4[/tex].

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The balanced chemical equation for the neutralization reaction is Al(OH)₃ + 3HNO₃ ----> Al(NO₃)₃ + 3H₂O.

A balanced chemical reaction is defined as the equation in which the number of atoms in each reaction remains the same on both sides like on the product side and the reactant side. In a balanced chemical equation, the mass, as well as the change, remains the same in a balanced chemical equation.

A neutralization reaction is a reaction in which the acid reacts quantitatively with a base to form salt and as well as water is known as neutralization reaction. In a neutralization reaction, there is a combination of H+ ions and OH– ions that form water.

The balanced chemical equation for the given value of the neutralization reaction is given below.

 Al(OH)₃ + 3HNO₃ ----> Al(NO₃)₃ + 3H₂O, the equation is balanced.

So we can conclude that  Al(OH)₃ + 3HNO₃ ----> Al(NO₃)₃ + 3H₂O is the balanced reaction.

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The formula for Ag ^+ and Na2S is,

Net Ionic Equation

2Ag + Na2S = Ag2S + 2Na might be an ionic equation.

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Each isotopes has  a different atomic mass , and each occurs in nature in different abundance this statement is true.

Isotopes can be defined as varieties of chemical elements that have the same number of protons and electrons but  different numbers of neutrons. In other words, isotopes are varieties of elements that differ in their number of nucleons (the total number of protons and neutrons)  due to the difference in the total number of neutrons in their nuclei. The total number of neutrons in the nucleus of an isotope can be determined by subtracting the atomic number of the element from the mass number of the isotope.

For example, the  mass number of the isotope 12C of carbon is 12. The atomic number of carbon is 6. Therefore, the isotope carbon-12 has a total number of neutrons of 6.

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This reaction is exothermic reaction and amount of heat that was released or absorbed by the reaction is 208.8kJ and reaction enthalpy means ΔH is 705.91kJ/mol

An exothermic process releases heat causing the temperature of the immediate surroundings to rise

Here given reaction is

KOH → K⁺ + OH⁻

So, here given data is 14.4 gram of potassium hydroxide in 250 gram of water and the temperature of water rise from 20°C to 34.5°C and

We have to find which type of reaction is this =? and

Calculate heat released or absorbed by this reaction =? and

Calculate reaction of enthalpy ΔH = ?

So this reaction is exothermic because when potassium react with water it gives potassium hydroxide and in that potassium hydroxide the potassium is positive charge and OH has negative charge

Amount of heat released or absorbed by the reaction the formula are

q = m×c×ΔT and ΔT =  20°C - 34.5°C = 14.5°C and c = 0.452J/g°C

q = 14.4 gram×0.452×14.5°C

q = 94.377kJ

Reaction enthalpy means  ΔH so,

ΔHreaction = m×s×ΔT

ΔHreaction =  14.4 gram×94.377kJ×14.5°C

ΔHreaction = 705.91kJ/mol

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There are 0.0476 moles in a gas at 273 K and 1.4 atm in a container with a volume of 30 L.

The mole (symbol: mol) is the unit of substance amount used by the International System of Units (SI). The amount of a material determines how many elementary entities of that substance are present in an object or sample.

A mole contains precisely 6.022 14076 × 1023 elementary entities. Depending on the substance, an elementary entity may be an atom, a molecule, an ion, an ion pair, or a subatomic particle like an electron. Ten moles of water, a chemical compound, and ten moles of mercury, a chemical element, both contain exactly one atom for each molecule of water, despite having differing volumes and masses.

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The molarity of the aqueous solution is determined as 0.72 M NaOH.

Molarity is used to express the concentration of a solution. It is described as the number of moles of a solute in a given concentration of a solution.

Mathematically, molarity is given as;

M = n/V

where;

The volume of the water is calculated as follows;

volume = mass / density

volume = (5 kg) / (1000 kg/m³)

volume = 0.005 m³

The volume of the water in liters is calculated as follows;

volume = 0.005 m³ = 5 liters

The given parameters;

number of moles of the solute = 3.6 moles

Molarity = 3.6 moles / 5 L

molarity = 0.72 M

Thus, the molarity of the aqueous solution of sodium hydroxide is determined from the ratio of number of moles to the volume of the solution.

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Once started, nuclear fission reactions are able to continue to occur on their own because a neutron begins the reaction, and more neutrons are formed in it; option D

Nuclear fission is a type of nuclear reaction in which the nucleus of atoms of large molecular mass is split into two or more smaller atomic nuclei.

Nuclear fission reactions result in the release of large amounts of heat energy and radiation.

Nuclear fission reactions once started, are able to go on occurring on their own until all fissionable material is used up. This is known as a chain reaction.

A chain reaction in nuclear fission occurs because when the atomic nucleus of the large atom is bombarded with fast-moving neutrons, the neutrons that are captured by the nucleus of the large atom results in the fission of the atom and the release of more neutrons that initiate more fission reactions.

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The empirical formula of the caffeic acid is C₂H₂O.

The mass composition of the carbon and hydrogen in the carbon dioxide and water respectively is calculated as follows;

mass of carbon in 220 mg of CO₂ = (12 x 0.22 g)/(44) = 0.06 g

mass of hydrogen in 40.3 mg of H₂O = (2 x 0.0403 g) / (18) = 0.0045 g

mass of oxygen = 0.1 g - (0.06 g + 0.0045 g) = 0.0355 g

The molar composition of the elements is calculated as follows;

H = 0.0045 /1 = 0.0045

C = 0.06 / 12 = 0.005

O = 0.0355 / 16 = 0.0022

Divide through with the smallest molar composition

H = 0.0045 / 0.0022 = 2

C = 0.005/0.0022 = 2

O = 0.0022/0.0022 = 1

The empirical formula is C₂H₂O

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The complete question is below:

Combustion of 1.00 × 102 mg of caffeic acid yields 220 mg of CO2 and 40.3 mg of H2O. find the empirical formula of the caffeic acid.