Using the reaction below and your knowledge of limiting reactants, find what mass of iron(II) chloride can be made from 0.60 g of Fe and 0.53 g of Cl2. Round to the nearest 0.01 and remember to include both units and substance in your answer!!! Fe + Cl2 --> FeCl2

Answer:

Explanation:

0.87

The Thomson model of the atom proposed that the atom was a sphere of positive charge with negative electrons embedded in it. This model was later disproved by the Rutherford model, which proposed that the atom was composed of a small, dense, positively charged nucleus surrounded by a cloud of negatively charged electrons. The Rutherford model also suggested that the electrons were in orbit around the nucleus, rather than being embedded in it.

Answer: C

Explanation:

Covalent bonds are formed when atoms share electrons.

Two hydrogen atoms sharing electrons with one oxygen atom are covalent bonds.

A 7.90 L container holds a mixture of two gases at 51 °C. The partial pressures of gas A and gas B, respectively, are 0.292 atm and 0.676 atm. If 0.110 mol of a third gas is added with no change in volume or temperature, the total pressure become 1.25atm.

The Ideal Gas Law states that under the same temperature, pressure and volume all gases contain the same number of molecules.The Ideal Gas law not apply when the temperature and pressure are near the point of transubstantiate into a liquid or solid.

Partial pressure of A gas = 0.292atm

Partial pressure of B gas = 0.676atm

Total pressure=(0.292+0.676)atm

= 0.968atm

Volume = 7.90L

Temperature = 324K

Calculate the number of moles as follows:

PV = nRT

0.968 × 7.90 = n 0.0821L × 324

n =  0.968 × 7.90/ 0.0821L × 324

= 7.64 / 26.6

=0.28 mol

Moles of A and B = 0.28mol

Moles of third gas = 0.110mol

Total moles=(0.28+0.110)mol

=0.39mol

Calculate the total pressure as follows:

P(7.90L)=(0.39mol)(0.0821L.atm/mol.K)(324K)

P=(7.90L)

(0.39mol)(0.0821L.atm/mol.K)(310K)

= 1.25atm

Thus, the total pressure become 1.25atm.

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Other reactions that can occur during the reaction between ammonia and oxygen are:

1) Decomposition of ammonia: 2 NH3(g) → N2(g) + 3 H2(g)

2) Oxidation of nitrogen: 4 NO(g) → 2 N2O(g) + 2 O2(g)

3) Formation of nitrogen dioxide: 4 NO(g) + O2(g) → 2 NO2(g)

4) Combustion of hydrogen: 2 H2(g) + O2(g) → 2 H2O(g)

These reactions can occur under different conditions, such as high temperature or pressure, or the presence of catalysts.

A material that catalyzes a chemical reaction does so without being consumed or altered. Its function is to reduce the activation energy necessary for a reaction to happen, enabling the reaction to occur more rapidly and readily. By offering a different reaction pathway with a lower activation energy, catalysts enable the reactants to achieve the transition state and progress more quickly in the direction of the product. Catalysts can be used to speed up otherwise too-sluggish reactions or to create desired products from undesirable or unwanted ones. They are utilized in many commonplace products, such as automotive catalytic converters, and are essential in numerous industrial procedures.

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The actual average mass of 1 lithium atom is 6.941 grams/atom this is equal to one mole of lithium.

The fundamental physical property of matter is mass. The atomic mass refers to the mass of an atom or molecule. To calculate the average mass of elements and molecules and to solve stoichiometry problems, the atomic mass is used.

Lithium, for example, has an atomic mass of 6.941 grams, which is equivalent to one mole of lithium. This is why we express atomic and molecular masses in grams per mole, or g/mol.

Thus, The actual average mass of 1 lithium atom is 6.941 grams/atom.

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Answer:

Explanation:

In an oxidation-reduction (redox) reaction, electrons are transferred from one substance to another. There are two key components that are essential in a redox reaction:

An oxidizing agent (or oxidant): This is the substance that accepts electrons and becomes reduced during the reaction. The oxidizing agent is responsible for causing oxidation in the other substance involved in the reaction.

A reducing agent (or reductant): This is the substance that donates electrons and becomes oxidized during the reaction. The reducing agent is responsible for causing reduction in the other substance involved in the reaction.

In a redox reaction, the reducing agent is oxidized and loses electrons, while the oxidizing agent is reduced and gains electrons. The transfer of electrons from one substance to another is what drives the reaction and leads to the formation of new products.

For example, consider the reaction between magnesium metal (Mg) and oxygen gas (O2) to form magnesium oxide (MgO):

2Mg + O2 → 2MgO

In this reaction, magnesium metal is oxidized (loses electrons) and oxygen gas is reduced (gains electrons). Magnesium is the reducing agent, while oxygen is the oxidizing agent.

The volume of the solution is 2600 L

The first step is to determine how much solute you need to dissolve in the solvent. This will depend on the desired concentration of the solution and the volume of solvent you plan to use then measure the amount of solute needed for the solution. Be sure to use the correct units of measurement.

We know that;

Number of moles of the NaCl = 30.2 g/58.5 g/mol

= 0.52 moles

Now;

Number of Moles = Concentration * volume

Volume = Number of moles/Concentration

= 0.52 moles/0.200 M

= 2.6 L or 2600 mL

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a)possesses a negative charge - electron

b)has no charge - neutron

c)has a mass slightly less than that of a neutron - proton

d)has a charge equal to, but opposite in sign from, that of an electron - proton.

What has a negative charge?

Electrons have a negative charge. The charge on the proton and electron are exactly the same size but opposite. Neutrons have no charge. Since opposite charges attract, protons and electrons attract each other.

What are the four properties of neutrons?

Neutrons are neutral particles – with no net electric charge.

Neutrons have a non-zero magnetic moment.

Free neutrons (outside a nucleus) are unstable and decay via beta decay.

Is a neutron's mass slightly less than a proton's?

The mass of a neutron is slightly greater than the mass of a proton, which is 1 atomic mass unit (AMU).

Is the charge of an electron opposite to the charge of a proton?

Electrons and protons have equal and opposite charges. The magnitude of this charge is 1.6×10−19 Coulomb.

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The moles of Cl atoms in 0.0395 g of C₂H₄Cl₂ is  1.28 x10⁻⁴ There are two chlorine atoms in a mole of chlorine. since chlorine has two atoms.

1 mole of C₂H₄Cl₂ has 2 Cl atoms per 99g, or x moles,

                                    n = (0.0649/99).

You would get the number of Cl atoms in 0.0649 g of C₂H₄Cl₂ by multiplying by 2x.

First, find the molecular weight of C₂H₄Cl₂.  Look up in your chemistry book the atomic weights in g/mole of C, H, and Cl.  The molecular weight is

                                  2(C) + 4(H) + 2(Cl).

Dividing  the given mass of C₂H₄Cl₂ by the molecular weight.  Which  gives the number of moles of C₂H₄Cl₂.

Finally, we have to multiply the number of moles of C₂H₄Cl₂ by 2 to get required number of moles of Cl atoms.

The mole is the amount of a system's substance that is equal to the number of elementary entities in 0.012 kilograms of carbon 12; Mol is its symbol. A mole is the amount of a substance that has the same number of discrete entities (like atoms, molecules, and ions) as a sample of pure 12C that weighs exactly 12 g.

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Urea is the primary nitrogenous byproduct of protein breakdown in all mammals as well as certain fishes. Therefore, 1.81×10²¹atoms are present.

Urea, commonly known as carbamide, is a carbonic acid diamide. It has the formula H2NCONH2. Urea is used as a fertilizer as well as feed additive, as well as a beginning ingredient in the production of polymers and pharmaceuticals. It is a colorless, crystalline chemical that dissolves at 132.7 degrees Celsius (271 degrees Fahrenheit) and decomposes after boiling.

Urea is the primary nitrogenous byproduct of protein breakdown in all mammals as well as certain fishes. The substance is found not just in all animals' urine, but also mammalian blood, bile, milk, as well as sweat.

mole =given mass /molar mass

     =2×453.6g/60.06

    =907.2/60.06

    = 15.10

atoms of nitrogen = 2×15.10 × 6.022×10²³=1.81×10²¹atoms

Therefore, 1.81×10²¹atoms are present.

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The term mole concept is used here to determine the mass of hydrogen. The mass of MnO₂ which is 4300g and that of hydrogen is 2.21 g. Thus the correct option is B for question 1 and same B for question 2 .

One mole of a substance is defined as that quantity of it which contains as many entities as there are atoms exactly in 12 g of carbon - 12. The formula used to calculate the number of moles is:

Number of moles = Given mass / Molar mass

The molar mass of water is 18.01528 g/mol and the given mass is 445 g.

Then the number of moles is:

445 g/ 18.01528 g/mol = 24.7 mol

In the equation 1 mole of 'H₂O' = 2 mole of 'MnO₂' and the molar mass of MnO₂ is 86.93 g/mol.

Then the mass of MnO₂ produced is:

445 ×1/18.01528 ×2 mol MnO₂/ 1 mol H₂O × 86.93 g/mol / 1 mol H₂O

= 4294.3 g

In scientific notation it is written as 4.3 × 10³ g = 4,300 g.

Thus the correct option is B.

In question 2:

The molar mass of oxygen is 16.00 g/mol and the given mass is 8.75.

Then the number of moles is:

8.75 g / 16.00 g/ mol = 0.546 mol

In the equation 1 mole of 'O' = 4 mole of 'H' and the molar mass of H₂ is 1.00794 g/mol.

Then the mass of H₂ produced is:

8.75 × 1 / 16.00 × 4/1 × 1.00794 / 1 = 2.2048 = 2.21 g.

Thus the correct option is B.

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O2 is the limiting reagent and yields 20.4g of CO2.

Describe limiting reagent

The limiting reactant, also known as the limiting reagent, is the reactant that is used first during a chemical reaction, hence restricting the amount of product that can be produced.

2C₂H₂ + 5O₂   →  4CO₂ + 2H₂O

Quantity of C2H2 moles:

Moles equal mass divided by molar mass.

13.7 g/26.04 g/mol is the number of moles.

= 0.526 mol.

O2 moles are calculated using the formula: moles = mass / molar mass.

18.5 g/32 g/mol = the number of moles

= 0.578 mol

Produced CO2 mass:

Number of moles times molar mass equals mass.

Mass = 0.4622 mol at 44 g/mol

Mass = 20.328 g

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The best scenario when using formal charge to predict molecular structure is the arrangement with the smallest nonzero formal charges.

Formal charge is the difference between the number of valence electrons an atom has in its elemental form and the number of electrons assigned to it in a Lewis structure. The goal in molecular structure prediction is to distribute the electrons in a way that minimizes the formal charges on the atoms. The smallest formal charges indicate a more electrically neutral arrangement, which is generally considered the most stable and accurate representation of the molecule's electron distribution. So, option (b) the arrangement with the smallest nonzero formal charges" is the best scenario.

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The concentration of 5 mg/ml refers to the mass of the solute dissolved in a given volume of solvent (ethyl acetate) to create a solution

The 5 mg should be added to the volume of solvent, so the final volume of the solution will be greater than 1 ml.

The concentration of 5 mg/ml refers to the mass of the solute (in this case, the material in the supernatant) dissolved in a given volume of solvent (ethyl acetate) to create a solution. It is a measure of how much of the solute is present in a unit volume of the solution.

If you want to achieve a final concentration of 5 mg/ml for the pellet, you would need to dissolve 5 mg of the pellet in enough ethyl acetate to make a total volume of 1 ml. The 5 mg should be added to the volume of solvent, so the final volume of the solution will be greater than 1 ml.

It's worth noting that the concentration of the pellet may be different from the concentration of the supernatant, depending on the experimental procedure used to generate the supernatant. It's also possible that the 5 mg/ml concentration is not relevant to the pellet and is only given as a reference point for the supernatant.

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The reaction is a substitution reaction of a chlorobenzene with bromine in the presence of iron(III) bromide (FeBr3) as a catalyst. The two major products in this reaction are ortho-brominated and para-brominated derivatives of the chlorobenzene.

The structures of these two products can be represented as follows:

Ortho-brominated product and Para-brominated product.

It's worth noting that the ortho- and para-brominating of chlorobenzene is a two-step reaction. First, the iron(III) bromide catalyst reacts with bromine to form iron(III) bromide hexahydrate (FeBr3•6H2O), which acts as a source of electrophilic bromine. The electrophilic bromine then reacts with the chlorobenzene to form the ortho- and para-brominated derivatives.

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The following molecule that can form hydrogen bonds is acetic acid (A)

Because it is a polar molecule, acetic acid is capable of forming hydrogen bonds with the water molecules in the environment. The hydrogen bonding (H-bonding) that exists between the molecules of acetic acid and water is the most powerful force that is responsible for determining the chemical and physical characteristics of the mixture. In its structure, acetic acid exhibits both a double oxygen-carbon bond as well as a hydrogen atom that is connected to an oxygen atom.

The oxygen atom that is part of the double bond in the acetic acid molecule has the potential to form a hydrogen bond with one of the hydrogen atoms in the water molecule. Two equivalent hydrogen bonds are known to cause acetic acid to form a cyclic dimer. Because of how stable the dimer is, it can even stay in the gas phase.

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answer : 0.00042 mol/L

steps:

Concentration = moles ÷ liters

Concentration = (number of moles) / (volume in L)

Concentration = 0.000188 mol / 0.450 L = 0.000417 mol/L

The concentration of the calcium bromide solution is 0.00042 mol/L (rounded to 3 significant figures).

The first step is to calculate the number of moles of calcium bromide in the solution:

Number of moles = (mass of CaBr2) / (molar mass of CaBr2)

The molar mass of CaBr2 is:

1 x atomic mass of Ca + 2 x atomic mass of Br = 1 x 40.08 g/mol + 2 x 79.90 g/mol = 199.88 g/mol

The mass of CaBr2 is given as 188.μmol, which is equivalent to 188 x 10^-6 mol.

Therefore, the number of moles of CaBr2 in the solution is:

Number of moles = (188 x 10^-6 mol) / (1 mol/ 1000 μmol) = 0.000188 mol

The volume of the solution is given as 450 mL, which is equivalent to 0.450 L.

Therefore, the concentration of the solution is:

Concentration = (number of moles) / (volume in L)

Concentration = 0.000188 mol / 0.450 L = 0.000417 mol/L

The concentration of the calcium bromide solution is 0.00042 mol/L (rounded to 3 significant figures).

ChatGPT

To construct the solubility curve, we must first determine the maximum amount of Ce2(SO4)3 that can dissolve in 100 grams of water at 10°C, which is approximately 20 grams.

To find the mole fraction of the solute in a solution of 4 m CaCl2, we need to first calculate the moles of CaCl2 present in 1 kg (1000 g) of the solution:

moles of CaCl2 = molality x mass of solvent (in kg)

= 4 mol/kg x 1 kg

= 4 mol

Next, we need to find the total moles of solute and solvent in the solution:

moles of solute = 4 mol

moles of solvent = mass of solvent (in g) / molar mass of solvent

= 1000 g / 18.015 g/mol (molar mass of water)

= 55.49 mol

Therefore, the total moles of solute and solvent in the solution is:

total moles = moles of solute + moles of solvent

= 4 mol + 55.49 mol

= 59.49 mol

Finally, we can calculate the mole fraction of the solute:

mole fraction of solute = moles of solute / total moles

= 4 mol / 59.49 mol

= 0.0672

Therefore, the mole fraction of the solute in a 4 m CaCl2 solution is 0.0672.

To calculate the molality of an ethylene glycol solution with a molarity of 2.87 M, we need to use the formula:

molality = moles of solute/mass of solvent (in kg)

We can find the moles of solute by multiplying the molarity by the volume of the solution in liters:

moles of solute = molarity x volume (in L)

= 2.87 mol/L x 1 L

= 2.87 mol

We can find the mass of the solvent by using the density of the solution:

mass of solvent = volume of solution x density

= 1 L x 1.04 g/mL

= 1040 g

Converting the mass of the solution

a. 25 grams: This is a supersaturated solution because 25 g is more than the maximum amount of Ce2(SO4)3 that can dissolve in 100 grams of water at 10°C.

b. 10 g: Because 10 g is less than the maximum amount of Ce2(SO4)3 that can dissolve in 100 g of water at 10°C, this solution is saturated.

c. 5 g  Because 5g is less than 10g, this is an unsaturated solution.

As a result, the answers are: a. supersaturated, b. saturated, and c. unsaturated.

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The anode and the cathode reaction is given as : Anode:

2Cl- (aq) → Cl2 (g) + 2e- (oxidation)

Cathode:

Mg2+ (aq) + 2e- → Mg (s) (reduction)

The reaction at the anode and cathode during the electrolysis of magnesium chloride (MgCl2) can be written as follows:

Anode:

2Cl- (aq) → Cl2 (g) + 2e- (oxidation)

Cathode:

Mg2+ (aq) + 2e- → Mg (s) (reduction)

These reactions occur as a result of the movement of ions in the solution towards the electrodes, where they gain or lose electrons, producing the desired products.

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Covalent bonds between purines and pyrimidine bases  is NOT a type of molecular interaction that determines the tertiary structure of a protein. The correct answer is A.

A polypeptide's overall three-dimensional structure is referred to as its tertiary structure. The interactions between the R groups of the amino acids that make up the protein are principally responsible for the tertiary structure.

The entire spectrum of non-covalent bonds, including hydrogen bonds, ionic bonds, dipole-dipole interactions, and London dispersion forces, all contribute to tertiary structure.

For instance, R groups with opposite charges can form an ionic bond, while those with like charges repel one another. Similar to other dipole-dipole interactions, polar R groups can create hydrogen bonds

Hydrophobic interactions are crucial to tertiary structure because they allow hydrophilic amino acids to connect with nearby water molecules on the outside of the protein while forming clusters of nonpolar, hydrophobic R groups on the inside of the protein.

The disulfide link is a unique sort of covalent bond that can contribute to tertiary structure. Disulfide bonds, covalent connections between the side chains of cysteines that contain sulfur, are substantially more powerful than the other kinds of bonds that make up tertiary structure.

They serve as molecular "safety pins," firmly connecting various polypeptide components to one another.

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Compatibility of types of substances based on the description according to the Arrhenius acid-base definition is -A base contains the unit: OH in its formula.

Acid is a substance that when dissolved in water will decompose and produce H+ ions. Examples of acids such as hydrogen chloride (HCl), when dissolved in water will decompose into H+ ions and Cl- ions.

While a base is a substance that when dissolved in water produces OH- ions. An example is the compound sodium hydroxide NaOH which when dissolved will decompose Na+ and OH-. The reaction of a base with an acid will produce a 'salt' compound.

According to the Arrhenius definition, acids and bases are acids as substances that when dissolved in water produce hydronium ions (H+). Meanwhile, a base according to Arrhenius is a substance that can produce hydroxide ions when dissolved in water, or in its formula it is called (OH−).

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151.3 grams of carbon are required to produce 12.6 moles of methane.

The balanced chemical equation for the reaction is:

C + 2H₂ → CH₄

According to the stoichiometry of the equation, 1 mole of carbon reacts with 2 moles of hydrogen gas to produce 1 mole of methane gas. Therefore, the number of moles of carbon required to produce 12.6 moles of methane is:

12.6 moles CH₄ × 1 mole C / 1 mole CH₄ = 12.6 moles C

To convert moles to grams, we need to use the molar mass of carbon, which is 12.01 g/mol.

Therefore, the mass of carbon required to produce 12.6 moles of methane is:

12.6 moles C × 12.01 g/mol = 151.3 g

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Rutherford discovered the nucleus . Option B

Ernest Rutherford is famous for his discovery of the structure of the atom and his pioneering work in nuclear physics. He made several key discoveries that transformed our understanding of atomic structure and the behavior of atomic nuclei.

Rutherford performed his famous gold foil experiment in which he used alpha particles to probe the structure of the atom. He found that most alpha particles passed straight through the gold foil, but a small number were deflected. This showed that the atom had a small, dense nucleus at its center.

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Rutherford's experiment was important because it showed that atomic nucleus and is therefore dented as option A.

This is referred to as a procedure carried out to support or refute a hypothesis, or determine the efficacy or likelihood of something previously untried.

Rutherford was a scientist who was famous for his gold-foil experiment, in which he demonstrated that the atom has a tiny, massive nucleus by  bombarding aluminum foil with beam of light known as alpha particles which is therefore the reason why option A was chosen as the correct choice.

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The heat required is 2347 J

The heat required for a change of state depends on the substance, the amount of the substance, and the specific change of state involved.

When a substance undergoes a change of state, such as melting or boiling, heat is added or removed to cause the particles in the substance to gain or lose energy and rearrange themselves into a new physical state. The amount of heat required to effect this change is known as the heat of transformation, or the heat of fusion

We know that;

H1 = 25.0 *  0.235 * (962 - 950)

= 70.5 J

H2 = 25 g * 88 J/g

= 2200 J

H3 = 25 * 0.278  * (972 - 962)

=76. 5 J

Then we have that;

70.5 J + 2200 J + 76. 5 J

=2347 J

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Answer:

Explanation:

The chemical name for MoO3 is molybdenum trioxide.

The reaction A+B⇒3C always goes to completion. If you have 10 A, the number of B which would be needed to make the most C is 10 and is therefore denoted as option C.

This is referred to as a process in which one or more substances, the reactants, are converted to one or more different substances, the products.

If you have 10 A, the number of B which would be needed to make the most C is 10 because of the equal amount number of mole of the substances or elements involved in the reaction.

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The number of grams of carbon in 25g of carbondioxide is 6.82g.

The mass of an element in a compound can be calculated by dividing the atomic mass of the element by the molar mass of the compound multiplied by the mass of the compound.

According to this question, there are 25g of carbondioxide. The mass of carbon in this compound can be calculated as follows:

Mass of carbon = 12/44 × 25

Mass of C = 6.82g

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Aluminum (Al) is not considered an essential nutrient for photosynthesis or phytoplankton growth.

While aluminum is abundant in the Earth's crust, its availability is dependent on soil pH, and it is not required for photosynthesis or phytoplankton growth. The essential nutrients for photosynthesis and phytoplankton growth are:

Photosynthesis and phytoplankton growth are essential processes in the global carbon cycle. Photosynthesis uses light energy to convert carbon dioxide and water into energy-rich organic compounds, while phytoplankton growth utilizes organic compounds to produce organic matter. Both processes are essential for maintaining the balance of carbon dioxide in the atmosphere and oceans.

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