calculate the molarity of a sultion prepare by dissolving 78.6 g of kf in enough water to produce 225 ml of solution

Balanced equation :

3NaOH + Fe(NO₃)₃⇒ Fe(OH)₃ +  3NaNO₃

Given

Word equation

Required

Balanced equation

Solution

Chemical equations can be expressed in terms of:

Sodium hydroxide reacts with a solution of iron (III)

nitrate to create a solid of iron (III) hydroxide in a solution of

sodium nitrate.

We determine the chemical formula of each compound then we balance the chemical equation

Sodium hydroxide = NaOH

Iron (III)nitrate = Fe(NO₃)₃

Iron (III) hydroxide = Fe(OH)₃

Sodium nitrate = NaNO₃

Reaction

NaOH + Fe(NO₃)₃⇒ Fe(OH)₃ +  NaNO₃

Give a coefficient(most complex compound = 1)

aNaOH + Fe(NO₃)₃⇒ bFe(OH)₃ +  cNaNO₃

Fe, left = 1, right=b⇒b=1

N, left=3, right=c⇒c=3

O, left=a+9, right=3b+3c⇒a+9=3b+3c⇒a+9=3.1+3.3⇒a+9=12⇒a=3

The equation becomes :

3NaOH + Fe(NO₃)₃⇒ Fe(OH)₃ +  3NaNO₃

Answer:

I think the answer is true

Each B-Cl bond in BCl involves the overlap of one of boron's 2p orbitals with one of chlorine's 3p orbitals. This allows the two atoms to share electrons and form a covalent bond.

In BCl, there are two B-Cl bonds formed, each involving the overlap of a boron orbital and a chlorine orbital. Boron has three valence electrons, and its electron configuration is 1s2 2s2 2p1. Chlorine has seven valence electrons, and its electron configuration is 1s2 2s2 2p6 3s2 3p5.
The boron orbital that overlaps with the chlorine orbital is the 2p orbital. This is because boron's valence electron is in the 2p subshell, and it forms covalent bonds by sharing this electron with other atoms. For each B-Cl bond, one of the boron's 2p orbitals overlaps with one of the chlorine's 3p orbitals.
The chlorine orbital that overlaps with the boron orbital is the 3p orbital. This is because chlorine's valence electrons are in the 3p subshell, and it forms covalent bonds by sharing these electrons with other atoms. For each B-Cl bond, one of the chlorine's 3p orbitals overlaps with one of the boron's 2p orbitals.
In summary, each B-Cl bond in BCl involves the overlap of one of boron's 2p orbitals with one of chlorine's 3p orbitals. This allows the two atoms to share electrons and form a covalent bond.

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Answer: It would take 300 light years to reach Earth.

Explanation:

Answer:

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

\(a = \frac{f}{m} \\ \)

where

f is the force

m is the mass

a is the acceleration

From the question

f = 150 N

m = 50 kg

We have

\(a = \frac{150}{50} = \frac{15}{5} \\ \)

We have the final answer as

Hope this helps you

The equilibrium constant (K) for the given reaction is 0.00213 and the standard free energy change (ΔGn) for the given reaction is 11.59 kJ/mol.

The reaction A + B is given, with the concentrations of reactants as [A] = 2 mM, [B] = 3 mM, and [C] = 9 mM. We have to calculate the standard free energy change (AG°) of this reaction.As we know that the relationship between the standard free energy change (AG°), equilibrium constant (K) and the standard enthalpy change (AH°) is given as follows:AG° = - RTlnKWhere R is the gas constant, T is the temperature in Kelvin (K), and ln denotes the natural logarithm.Given,[A] = 2 mM, [B] = 3 mM, and [C] = 9 mMThe balanced chemical equation isA + B ⇌ CGiven the equilibrium concentrations, the reaction quotient (Qc) can be calculated.Qc = [C] / [A] [B] = 9 / (2 x 3) = 1.5Substitute the values into the equation to obtainAG° = - (8.314 J/K.mol) x (298 K) x ln (1.5)AG° = - 2041.5 J/mol = - 2.04 kJ/mol (approx)Therefore, the standard free energy change (AG°) of the given reaction is -2.04 kJ/mol.C) .

The given reaction is Fructose-1-P + H2O ⇌ fructose + Pi. The initial concentration of fructose-1-P is 0.2 M and the concentration of fructose-1-P at equilibrium is 6.52 x 10-5 M. We have to calculate the equilibrium constant (K) and the standard free energy change (ΔGn) for this reaction.The relationship between the equilibrium constant (K) and the standard free energy change (ΔGn) is given as follows:ΔGn = - RTlnKWhere R is the gas constant, T is the temperature in Kelvin (K), and ln denotes the natural logarithm.Given,Initial concentration of fructose-1-P = 0.2 MConcentration of fructose-1-P at equilibrium = 6.52 x 10-5 MThe balanced chemical equation isFructose-1-P + H2O ⇌ fructose + PiFrom the balanced equation, we see that the stoichiometric ratio is 1:1. Therefore, the concentration of fructose at equilibrium is also 6.52 x 10-5 M.Substitute the values into the equation to obtainK = [fructose] [Pi] / [fructose-1-P] [H2O]At equilibrium, K = [fructose] [Pi] / [fructose-1-P] [H2O] = (6.52 x 10-5)2 / (0.2 x 1)K = 0.00213Substitute the value of K into the equation to obtainΔGn = - RTlnKΔGn = - (8.314 J/K.mol) x (298 K) x ln (0.00213)ΔGn = 11.59 kJ/mol (approx).

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1.2 × 10²³ molecules are there in 24 grams of  FeF₃ molecule. 1 mole is equal to 6.023 × 10²³ particles.

A mole is a important unit of measurement that chemists use in calculation. 1 mole is exactly equal to the 6.023 × 10²³ particles.

The term mole is defined as the amount of substance containing 6.023 × 10²³ molecules.

First multiply the number of moles supplied by Avogadro's Number to detect how many molecules there are.

Moles are determined from the molecular weight.

For FeF₃ molecule,

55.8 + 3⋅19 = 116g/mole

24 gram /  116g/mole

= 0.207 moles of  FeF₃

= 0.207 moles × 6.023 × 10²³

= 1.2 × 10²³ molecules

Thus, in 24 grams of FeF₃ molecule 1.2 × 10²³ molecules are present.

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The molar solubility of BaCO₃ is 5.09 * 10⁻⁵ M.

Molar Solubility of BaCO₃:

To find the molar solubility of BaCO₃, given that its Ksp is 2.6×10⁻⁹, follow these steps:

1. Write the balanced dissolution reaction: BaCO₃(s) ⇌ Ba²⁺(aq) + CO₃²⁻(aq)

2. Express the Ksp expression: Ksp = [Ba²⁺] [CO₃²⁻]

3. Determine the molar solubility, which we'll call "s." Since BaCO₃ dissociates into a 1:1 ratio of Ba²⁺ and CO₃²⁻, the concentrations of both ions will be equal to "s."

4. Substitute the molar solubility values into the Ksp expression: Ksp = (s)(s) = s²

5. Solve for "s" using the given Ksp value: 2.6×10⁻⁹ = s²

6. Calculate the molar solubility: s = √(2.6×10⁻⁹) ≈ 5.09 × 10⁻⁵ M

So, the molar solubility of BaCO₃ is approximately 5.09 × 10⁻⁵ M.

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The false statement about disulfide bond formation is (d) disulfide bonds form spontaneously within the ER because the lumen of the ER is oxidizing. Disulfide bonds do form within the ER, but not spontaneously.

Instead, they are formed by the action of enzymes called protein disulfide isomerases (PDIs). PDIs catalyze the oxidation of cysteine residues to form disulfide bonds. Disulfide bonding (b) stabilizes the structure of proteins, and (a) disulfide bonds do not form under reducing environments. Additionally, disulfide bonds do not (c) grow from both ends, the growth rate is faster at the plus ends. Instead, they are formed between two cysteine residues on the same polypeptide chain or between different polypeptide chains.

The false statement about disulfide bond formation among the given choices is (a) disulfide bonds do not form under reducing environments grow from both ends, the growth rate is faster at the plus ends. This statement is unrelated and incorrect. In reality, disulfide bonds (b) form by oxidation of cysteine pairs, (c) stabilize protein structures, and (d) form spontaneously within the ER due to its oxidizing environment. Disulfide bonds play a vital role in maintaining the proper folding and stability of proteins, especially those secreted or located in extracellular environments.

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The mutated amino acid at position 229 is arginine (Arg), and its substitution can potentially disrupt the 3D structure and alter the function of the protein due to changes in side chain properties and interactions.

Structure of the Amino Acids:

The wild-type amino acid at position 229 is not specified, so the structure cannot be provided.

The mutated amino acid is arginine (Arg), which has a side chain containing a positively charged guanidinium group.

Importance of the Position:

The specific position 229 in the protein sequence may be functionally significant, such as being involved in protein-protein interactions, binding sites, catalytic activity, or structural stability.

Without detailed knowledge of the protein, its function, and its structural context, it is difficult to determine the exact importance of this specific position.

Effects of the Mutation on Structure and Function:

The substitution of an amino acid at position 229 from the original to arginine can have various effects on protein structure and function.

Arginine's larger and positively charged side chain may introduce steric clashes or alter electrostatic interactions within the protein structure.

The mutation can potentially disrupt local or global protein folding, stability, or conformational changes, affecting its overall 3D structure.

The functional consequences of the mutation depend on the specific role of the amino acid at position 229, which can include changes in protein-protein interactions, enzymatic activity, substrate binding, or signal transduction pathways.

It is crucial to analyze the protein's structural context, available experimental data, and computational modeling techniques to gain a more accurate understanding of the specific effects of the mutation on the protein's structure and function in the given context.

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Yes. The mass of the reaction before and after should be the same irrespective of whether all the reactants react.

If not all the reactants react and nothing is added or taken away from the reaction system, then the mass of the reaction before and after the reaction will still be the same.

This is because the law of conservation of mass states that mass is neither created nor destroyed during a chemical reaction, but only rearranged into different compounds or elements.

Therefore, any unreacted reactants or products that are formed in the reaction will still have the same mass as the original reactants.

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Answer:

Six

Explanation:

Mᵣ                           =  46

Aᵣ(C) = 0.522 × 46 =  24

Difference              =  22

Less 1 O                  = -16

Aᵣ(H)                        =   6

The relative atomic mass of the H atoms is 6.

The molecule contains six hydrogen atoms.

Answer:

4.18 gm of SO3

Explanation:

64gm of S gives 128 gm of SO3

then

1 gm of S gives 128/64 gm of SO3

2.09 gm of S gives (128/64)*2.09 gm of SO3

ANS:4.18 gm of SO3

Based on their distinctive functional groups, the two substances \(C_6H_5CN\) (benzonitrile) and \(CH_3CH_2NH_2\) (ethylamine) can be distinguished using IR spectroscopy.

Benzonitrile will show a significant absorption peak in the IR spectrum between 2230 and 2260 cm-1, which is related to the distinctive stretching vibration of the carbon-nitrogen triple bond (CN). The IR spectra of ethylamine lack this absorption peak.

The stretching vibration of the N-H bond, on the other hand, causes ethylamine to exhibit a significant absorption peak in the IR spectrum of about 3300-3500 cm-1. The IR spectra of benzonitrile do not show this absorption peak.

In a given pair of molecules, IR spectroscopy may successfully distinguish between benzonitrile and ethylamine by comparing the presence or absence of these particular absorption peaks.

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Answer:

Mixtures are one product of mechanically blending or mixing chemical substances such as elements and compounds, without chemical bonding or other chemical change, so that each ingredient substance retains its own chemical properties and makeup.

The statements that are true are the statements that have been marked 1 - 4 in the options. Statement 5 is not true. Options A,B,C,D.

The term thermal energy has to do with the energy that is possessed by a substance whose particles are in motion. This is why we can say that the thermal energy does derive from the total kinetic energy of the molecules that are present in a substance.

It then follows that when we hit the object up, there is an increase in the total kinetic energy of the molecules as well as an increase in thermal energy of the substance. The cold substances also has thermal energy as long as its molecules are still in motion.

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The relative atomic mass of hydrogen 1.00

The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit

Here given data is

99.30% of H atoms

0.70% H atoms

So we have to calculate the relative atomic mass of hydrogen. = ?

So the relative atomic mass = (isotope abundance × isotope mass) + (isotope abundance × isotope mass)

Relative atomic mass = (99.30% × 1) + (0.70% × 1)

Relative atomic mass = 1.00

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The [H3O+] in a 0.265 M HClO solution is 8.8 x 10-5 M.

This can be calculated using the following formula:

Ka = [H3O+][ClO-] / [HClO]

where:

Ka is the acid dissociation constant for HClO (2.9 x 10-8)

[H3O+] is the concentration of hydronium ions (the acidic species)

[ClO-] is the concentration of hypochlorite ions (the conjugate base of HClO)

[HClO] is the initial concentration of HClO

The acid dissociation constant, Ka, is a measure of how easily an acid dissociates in solution. A higher Ka value means that the acid dissociates more easily. In this case, the Ka value for HClO is 2.9 x 10-8, which means that HClO is a weak acid.

The concentration of hydronium ions, [H3O+], can be calculated by solving the equation for Ka. When we substitute the known values into the equation, we get:

                                           Ka = (2.9 x 10-8) * [H3O+] * [ClO-] / 0.265 M

Since [ClO-] is equal to [H3O+], we can simplify the equation to:

                                          2.9 x 10-8 = [H3O+]^2 / 0.265 M

Solving for [H3O+], we get:

                                          [H3O+] = 8.8 x 10-5 M

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6.

___ (NH₄)₃PO₄ + ___ Pb(NO₃)₄ ----> ___ Pb₃(PO₄)₄ + ___ NH₄NO₃

The easiest way to balance this kind of reaction is to consider the ions, not the elements alone. So we split the reaction into ions and we will balance them.

___ (NH₄)₃PO₄ + ___ Pb(NO₃)₄ ----> ___ Pb₃(PO₄)₄ + ___ NH₄NO₃

NH₄: 3 NH₄: 1

PO₄: 1 PO₄: 4

Pb: 1 Pb: 3

NO₃: 4 NO₃: 1

We have 3 ammonium ions on the left and just 1 ammonium ion on the right. We can change the coefficient for NH₄NO₃ and write a 3 in front of it.

4 (NH₄)₃PO₄ + ___ Pb(NO₃)₄ ----> ___ Pb₃(PO₄)₄ + 3 NH₄NO₃

NH₄: 3 NH₄: 3

PO₄: 1 PO₄: 4

Pb: 1 Pb: 3

NO₃: 4 NO₃: 3

Now the NH₄ is balanced. We have 4 phosphate ion on the right and just one on the left. We can change the coefficient for (NH₄)₃PO₄ and write a 4 there.

4 (NH₄)₃PO₄ + ___ Pb(NO₃)₄ ----> ___ Pb₃(PO₄)₄ + 3 NH₄NO₃

NH₄: 12 NH₄: 3

PO₄: 4 PO₄: 4

Pb: 1 Pb: 3

NO₃: 4 NO₃: 3

We balanced the PO₄ but unbalanced the NH₄, Let's go back to NH₄. We have 12 ions on the left and 3 on the left. The coefficient for NH₄NO₃ must be 12.

4 (NH₄)₃PO₄ + ___ Pb(NO₃)₄ ----> ___ Pb₃(PO₄)₄ + 12 NH₄NO₃

NH₄: 12 NH₄: 12

PO₄: 4 PO₄: 4

Pb: 1 Pb: 3

NO₃: 4 NO₃: 12

We can go on with Pb. We have 3 on the right and 1 on the left. We can change the coefficient for Pb(NO₃)₄ and write a 3.

4 (NH₄)₃PO₄ + 3 Pb(NO₃)₄ ----> ___ Pb₃(PO₄)₄ + 12 NH₄NO₃

NH₄: 12 NH₄: 12

PO₄: 4 PO₄: 4

Pb: 3 Pb: 3

NO₃: 12 NO₃: 12

And the equation is balanced.

Answer: 4 (NH₄)₃PO₄ + 3 Pb(NO₃)₄ ----> Pb₃(PO₄)₄ + 12 NH₄NO₃

7.

SnO₂ + ___ H₂ ----> Sn + ___ H₂O

Sn: 1 Sn: 1

O: 2 O: 1

H: 2 H: 2

The Sn is already balanced, but O is not. We have two atoms of O on the left and only 1 atom of O on the right side of the equation. We can change the coefficient in front of H₂O.

SnO₂ + ___ H₂ ----> Sn + 2 H₂O

Sn: 1 Sn: 1

O: 2 O: 2

H: 2 H: 4

We balanced the O, but we unbalanced the H. Now we have 4 atoms of H on the right and 2 atoms of H on the left side of the equation. So if we change the coefficient of H₂ and write a 2 we will balance the equation.

SnO₂ + 2 H₂ ----> Sn + 2 H₂O

Sn: 1 Sn: 1

O: 2 O: 2

H: 4 H: 4

Answer: SnO₂ + 2 H₂ ----> Sn + 2 H₂O

Answer:

Neutrons,Electrons and Protons I think.

The energy source would produce the greatest amount of emissions is fossil fuels.

Emission is related to the process of moving an object. According to the Cambridge Dictionary, emission is the amount of gas, heat, light, etc. that is sent out. This word is often used to refer to heat emission, light emission, to carbon emission.

Carbon emissions are gases released from the combustion of carbon-containing compounds, such as CO2, diesel, LPJ, and other fuels. In a simple sense, carbon emission is the release of carbon into the atmosphere.

Carbon emissions are a contributor to climate change along with greenhouse gas emissions. Excessive gas emissions can cause global warming or the greenhouse effect. This resulted in a significant increase in temperature on earth.

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Answer:

Ionization energy

Explanation:

Answer: 28 grams

Explanation:

calculation of the mass :

x grams = (22.4/100) * 125 grams

to solve for x otherwise known as how many grams we need :

x grams = (22.4/100) * 125 grams

x grams = 0.224 * 125 grams

x grams = 28 grams

Yes, a precipitate will form if you mix together 100 mL of 0.010 m calcium chloride with 100 mL of 1.0 x 10-5 m solution of potassium carbonate.

This is because the Ksp (solubility product constant) for calcium carbonate is 3.0 x 10-9. This means that when the concentrations of calcium and carbonate ions become too high, they will no longer be soluble and a precipitate will form. To understand this better, consider the following reaction:

CaCl2 (aq) + CO3 (aq) --> CaCO3 (s) + 2Cl- (aq).

This equation shows that calcium ions (Ca2+) from the calcium chloride solution will react with carbonate ions (CO3-) from the potassium carbonate solution to form solid calcium carbonate (CaCO3) and chloride ions (Cl-). When the concentrations of calcium and carbonate ions in the solution become too high, a precipitate will form as calcium carbonate.

The Ksp for calcium carbonate is a measure of how much calcium and carbonate ions can be present in the solution before a precipitate forms. This means that if the concentrations of the calcium and carbonate ions become greater than 3.0 x 10-9 molar, a precipitate will form. The concentrations of the calcium and carbonate ions in the given solutions are 0.010 m and 1.0 x 10-5 m respectively, both of which are greater than the Ksp of calcium carbonate and hence a precipitate will form.

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The thermal energy in a polystyrene cup, or any object for that matter, is stored in the kinetic energy of its particles. When a hot object, such as a cup of hot liquid, is left to cool down to room temperature, the thermal energy stored in the cup decreases as the particles collide less frequently.

As the cup and its contents cool, the particles within the cup begin to lose kinetic energy as they collide with each other and with the surrounding environment. As the particles lose energy, they move more slowly, which in turn decreases the amount of thermal energy stored in the cup.

Eventually, the cup and its contents reach a state of thermal equilibrium with the surrounding environment, meaning that they have reached the same temperature as their surroundings. At this point, the thermal energy stored in the cup has been completely transferred to the environment, and the cup is said to be at room temperature.

Overall, the decrease in thermal energy in a polystyrene cup when it cools down to room temperature is a result of the transfer of kinetic energy from the particles within the cup to the particles in the surrounding environment, through collisions and other forms of energy transfer.

-

Answer:

When a polystyrene cup cools down to room temperature, it means that the thermal energy in the cup has been transferred to its surroundings until thermal equilibrium is reached. Thermal energy transfer can occur through conduction, convection, and radiation. Conduction involves molecules transferring kinetic energy to one another through collisions. In this case, the thermal energy from the cup is transferred to the air molecules around it through collisions until both the cup and its surroundings reach the same temperature.

Explanation:

Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy. When two objects or systems are at different temperatures, heat will flow from the hotter object to the cooler one until both objects reach the same temperature. This state is called thermal equilibrium.

There are three ways that heat can be transferred: conduction, convection, and radiation. Conduction is the transfer of heat through direct contact between particles of a substance without moving the particles to a new location. This happens when molecules collide with each other and transfer their kinetic energy. For example, when you touch a hot pan on the stove, heat is transferred from the pan to your hand through conduction.

Convection occurs when hot air rises, allowing cooler air to come in and be heated. This creates a cycle where hot air rises and cool air sinks, creating a current that transfers heat. For example, when you boil water on the stove, the heat from the stove heats the water at the bottom of the pot. This hot water rises to the top and cooler water sinks to the bottom to be heated, creating a convection current that transfers heat throughout the pot.

Radiation is the transfer of heat through electromagnetic waves. This can happen even in a vacuum where there are no particles to transfer heat through conduction or convection. For example, when you stand in front of a fire, you can feel the heat even though you are not touching it. This is because heat is being transferred to you through radiation.

In the case of a polystyrene cup cooling down to room temperature, heat is transferred from the cup to its surroundings through conduction until thermal equilibrium is reached and both the cup and its surroundings are at the same temperature.

A student draws a distance verses time graph to describe the motion of a model train therefore the horizontal section of the graph indicates that  the train is moving with uniform velocity with no acceleration because there is no change in velocity.

This occurs when the average velocity between any two points along its path is the same in magnitude as well as direction.

If the velocity-time graph for the part of a journey is a horizontal line, then it simply means that the train is moving with uniform velocity with no acceleration because there is no change in velocity thereby making it the correct choice.

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The pH of a solution of sulphuric acid that has hydronium ion concentration is 4.26.

pH of any solution is define as the negative logarithm of the concentration of H⁺ ion present in any solution, i.e.

pH = -log[H⁺]

In the question, it is given that:

Concentration of hydronium ion or H⁺ ion = 5.45×10⁻⁵ M

So, pH will be:
pH = -log(5.45×10⁻⁵)

pH = -(-4.26)

pH = 4.26

Hence required pH is 4.26.

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