Calculate the pH of 0.16M Ch3cooh which has ka = 1.74 × 10^ -5 mol dm^-3.​

The standard change in Gibbs free energy for the reaction at 25 °C is 278.0 kJ/mol  for the given enthalpy of reaction .

The Gibbs free energy (or Gibbs energy as the preferred name; symbol G) is a thermodynamic potential that can be used to calculate the maximum amount of non-volume expansion work that a thermodynamically closed system can perform at constant temperature and pressure. It also serves as a prerequisite for processes like chemical reactions that may place under these conditions. The Gibbs free energy is denoted by the symbol G(p,T) = U+pV-TS = H-TS, where p denotes pressure, T denotes temperature, U denotes internal energy, V denotes volume, H denotes enthalpy, and S denotes entropy.

A thermodynamic quantity equal to a system's entire heat content. It is equivalent to the system's internal energy plus the product of pressure and volume.

According to the table, the standard Gibbs free energy of formation values are;

Fe₂O₃ (s) = -822.1 kJ/mol

Al₂O₃ (s) = -1675.2 kJ/mol

Al (s) = -1477.7 kJ/mol

Fe (s) = 0 kJ/mol

The reaction is:

Fe₂O₃ (s) + 2 Al (s) → Al₂O₃ (s) + 2 Fe (s).

Therefore, the standard change in Gibbs free energy for the reaction at 25 °C is:

AG = -822.1 kJ/mol + (2 x -1477.7 kJ/mol) - (-1675.2 kJ/mol) - (2 x 0 kJ/mol) = 278.0 kJ/mol

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Determining the underlying cause of the mutant form of the enzyme would require a combination of genetic, molecular, and biochemical techniques to identify any differences.

The mutation may have resulted from an insertion of extra DNA sequence in the gene encoding the enzyme. This could occur due to a replication error or as a result of exposure to mutagens.

To distinguish this from other possibilities, one could sequence the DNA of the normal and mutant forms of the enzyme to identify the differences.

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We need to use the mole ratio and in this case the mole ratio of the MgCl2 to the chloride ions is 1:2

In chemistry, a mole ratio is the ratio of the amounts, in moles, of any two compounds or elements involved in a chemical reaction. It is determined by the coefficients of the balanced chemical equation for the reaction.

Mole ratios can be used in stoichiometric calculations to determine the amount of one substance that is required to react with a given amount of another substance, or to calculate the amount of product that will be formed from a given amount of reactant.

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The helium sample would occupy a volume of 11.12 L if the pressure is reduced to 5.15 atm while maintaining the temperature at 20 °C.

According to Boyle's Law, gas volume grows as pressure lowers. According to Charles' Law, a gas expands in volume as its temperature rises. Moreover, Avogadro's Law states that as gas concentration rises, so does its volume.

The relationship between pressure, volume, and temperature of a gas is given by the ideal gas law:

PV = nRT

where P is the pressure of the gas, V is its volume, n is the number of moles of gas present, R is the gas constant, and T is the temperature of the gas in kelvins.

Assuming that the number of moles and the temperature of the gas remain constant, we can use the ideal gas law to solve for the new volume of the gas when the pressure is reduced:

P1V1 = P2V2

where P1 is the initial pressure, V1 is the initial volume, P2 is the final pressure, and V2 is the final volume.

Substituting the given values:

P1 = 5.79 atm

V1 = 9.89 L

P2 = 5.15 atm

T = 20 + 273.15 = 293.15 K (converting Celsius to Kelvin)

We can solve for V2:

P1V1 = P2V2

(5.79 atm)(9.89 L) = (5.15 atm)V2

V2 = (5.79 atm)(9.89 L) / (5.15 atm)

V2 = 11.12 L

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The oxidation state of the iron ion in the complex [Fe(en)2(NO2)2]NO2 is +1.

What is Oxidation State?

Oxidation state, also known as oxidation number, is a number assigned to an atom in a chemical compound that represents the number of electrons that atom has gained or lost relative to its neutral state.

In other words, oxidation state is a measure of the degree of oxidation of an atom in a molecule or ion. An atom is considered to be oxidized if it loses electrons, and reduced if it gains electrons.

In the given complex [Fe(en)2(NO2)2]NO2, the metal is iron (Fe). To determine the oxidation state of the iron ion in the complex, we can use the oxidation states of the other atoms and the charge of the complex.

The en ligand is ethylenediamine (C2H8N2), which has a neutral charge. The NO2 ligand is nitrite, which has a -1 charge. The overall charge of the complex is -1 due to the NO2^- counterion.

Let x be the oxidation state of the iron ion.

From the ethylenediamine ligands, we have a total charge of +4 (2 x +2).

From the nitrite ligands, we have a total charge of -4 (2 x -1 x 2).

From the complex charge, we have a total charge of -1.

Setting the sum of these charges equal to the charge of the iron ion (x) gives us:

+4 - 4 - 1 = x

Simplifying the equation gives us:

-x = -1

Solving for x gives us:

x = +1

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The pressure exerted by 2 moles of CO2 gas at a temperature of 27 degrees Celcius and a volume of 4 liters would be 12.27 atm.

For an ideal gas:

PV = nRT

Where:

In this case, n = 2 mole, v = 4 liters, and R = 0.08206

T = 27 + 273.15 = 300.15 K

Now we can plug in the values:

P(4) = (2)(0.08206)(300.15)

P = (2)(0.08206)(300.15) / 4

P = 12.27 atm

Therefore, the pressure exerted by 2 moles of CO2 gas at a temperature of 27 degrees Celsius and a volume of 4 liters is 12.27 atm.

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b. [tex]C_5N_4H_4O_3[/tex] is the chemical in the equation which acts as a base.

A base that can dissolve in water is referred to as being alkali. These chemicals produce salts when they interact chemically with acids. Red litmus can turn blue when bases are present. Depending on the specific way that the qualities of acidity and basicity are examined, the terms acid and base have been defined in a variety of ways.A base is defined as a compound which is capable of accepting a proton or a hydrogen ion in a chemical reaction.

Chemically, the equation is [tex]C_3N_2H_4+C_5N_4H_4O_3 \rightarrow C_3N_2H_5^+ +C_5N_4H_3O_3^-[/tex]

In this equation, [tex]C_5N_4H_4O_3[/tex] is the compound that is accepting a proton (or hydrogen ion) to form [tex]C_3N_2H_5^{+[/tex] and [tex]C_5N_4H_3O_3^-[/tex]. Therefore, [tex]C_5N_4H_4O_3[/tex] is the base in this equation.

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The empirical formula of a novel compound is CH2O if an analysis of a 0.5998g sample reveals that it contains the following masses of elements: carbon (0.1.565g), hydrogen (0.02627g), and oxygen (0.4170g).

You need to be aware of a compound's molar mass in order to ascertain its molecular formula. You can then decide which multiple of the empirical formula corresponds to the right molecular formula. 12.0g of carbon, 3.0g of hydrogen, and 8.0g of oxygen make up a compound in a 23.0g sample.

In a hydrocarbon, carbon makes up 92.3% of the mass and hydrogen makes up 7.7%.

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As alcohols and ethers undergo various reactions, there are a number of organic chemistry rules and principles that may be utilised to anticipate the main products that will result from those reactions.

Given that the water molecule can be thought of as H—OH, the Markovnikov's rule-following regioselectivity of alcohol products indicates that the hydrogen atom joins to the double bond carbon that has more hydrogen atoms, and the OH group attaches to the carbon that has fewer hydrogen atoms.

According to Markovnikov's rule, when an asymmetrical alkene is combined with an asymmetrical reagent, the reagent's negative half will connect to the carbon atom that has the fewest hydrogen atoms.

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The answer to your question is D) An invasive species is not native to the ecosystem and causes harm.

Invasive species of plants and animals typically tend to overtake an ecosystem that they do not naturally occur in. Due to this, it causes the resources within the ecosystem to diminish which ultimately harms other species that naturally occur in said ecosystem.

During the reaction, the hydrochloric acid molecules break apart into hydrogen ions (H+) and chloride ions (Cl-), which then react with the aluminium atoms to form aluminium chloride (AlCl₃) and hydrogen gas (H₂).

            HCl       HCl

             |         |

            Al        Al   aluminium

             |         |

            HCl       HCl

             |         |

            H₂         Cl₂

In the diagram, the reactants (hydrochloric acid and aluminium) are shown on the left-hand side, while the products (hydrogen gas and aluminium chloride) are shown on the right-hand side. The circles represent individual particles, with the blue circles representing aluminium atoms, the green circles representing chlorine atoms from hydrochloric acid, and the white circles representing hydrogen atoms from hydrochloric acid.

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The theoretical yield of the ammonia that is produced in this reaction is 43.9g.

The mole is commonly used to express the amount of a substance in a chemical reaction or to compare the amount of different substances.

Number of moles of N2

1 mole of N2 occupy 22.4 L

x moles of N2 occupies 29 L

x = 1.29 moles

Number of  moles of H2 is;

14g/ 2 g/mol = 7 moles

Now;

1 mole of N2 reacts with 3 moles of H2

x moles of N2 reacts with 7 moles of H2

x = 2.33 moles

Then N2 is the limiting reactant

If 1 mole of N2 produces 2 moles of NH3

1.29 moles of N2 will produce 1.29 * 2/1

= 2.58 moles

Mass of NH3 = 2.58 moles * 17 g/mol

= 43.9g

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The equation that would be used to calculate the rate constant from initial concentrations is option C:

k = [C] / ([A] [B])

What is Concentration?

It is a measure of how much of a particular substance is dissolved in a given volume of a solution.

where [A] and [B] are the initial concentrations of the reactants and [C] is the concentration of the product at a given time. This equation is known as the rate law for a second-order reaction.

The other equations listed are:

A. Kea - This is not a standard equation used to calculate rate constants from initial concentrations.

B. PV = nRT - This is the ideal gas law, which relates the pressure, volume, temperature, and number of moles of an ideal gas.

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Answer: The formula for nitrous acid is HNO2, not nitric acid (HNO3).

a. To find the number of moles of HNO2, we need to divide the number of atoms by Avogadro's number (6.022 x 10^23 atoms per mole):

moles = 8.8 x 10^22 atoms / 6.022 x 10^23 atoms/mol

moles = 0.146 mol HNO2

b. To find the mass of HNO2, we need to multiply the number of moles by the molar mass. The molar mass of HNO2 is:

1(1.008) + 1(14.01) + 2(15.99) = 63.01 g/mol

mass = 0.146 mol x 63.01 g/mol

mass = 9.20 g HNO2

Explanation:

As the conductivity of a 0.1 M acid solution at 298 K depends on the acid's strength, a specific Ka value cannot be determined.

We may utilize the following relationship between Ka and the level of ionization to estimate the Ka value that would produce the maximum conductivity for a 0.1 M acid solution at 298 K:

α²/(1-α) = Ka/[H+]

α²/(1-α) = Ka/0.1

1²/(1-1) = Ka/0.1\sKa = 0

Given that only strong acids completely breakdown into ions in solution, it follows that the acid would need to be strong with a Ka value significantly greater than zero in order to conduct electricity most effectively.

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The balanced chemical equation for the reaction between hydrochloric acid (HCI) and sodium hydroxide (NaOH) is:

HCI + NaOH -> NaCl + H2O

From the equation, we can see that 1 mole of HCI reacts with 1 mole of NaOH to produce 1 mole of NaCl and 1 mole of water.

First, let's calculate the number of moles of HCI in 250 mL of 0.25 M solution:

Molarity (M) = moles of solute / volume of solution (L)

0.25 M = moles of HCI / 0.25 L

moles of HCI = 0.25 L x 0.25 M = 0.0625 moles

Since 1 mole of NaOH reacts with 1 mole of HCI, we will need 0.0625 moles of NaOH to neutralize the HCI.

Now, let's calculate the volume of 0.9 M NaOH solution needed to provide 0.0625 moles of NaOH:

Molarity (M) = moles of solute / volume of solution (L)

0.9 M = 0.0625 moles of NaOH / volume of NaOH solution (L)

volume of NaOH solution (L) = 0.0625 moles / 0.9 M = 0.0694 L = 69.44 mL

Therefore, 69.44 mL of 0.9 M NaOH solution would be required to titrate 250 mL of 0.25 M HCI solution.

The resulting pH of the solution is calculated as to be approximately 2.97.

Formic acid is the simplest carboxylic acid that has the chemical formula HCOOH and structure H−C−O−H.

Balanced equation is : HCOOH + NaOH → NaCOOH + H₂O

n(HCOOH) = V x C = 55.0 mL x 0.25 mol/L = 0.01375 mol HCOOH

And 75.0 mL of 0.12 M NaOH solution contains: n(NaOH) = V x C = 75.0 mL x 0.12 mol/L = 0.009 mol NaOH

n(HCOOH remaining) = n(HCOOH) - n(NaOH) = 0.01375 mol - 0.009 mol = 0.00475 mol

pH = pKa + log([A-]/[HA])

pKa is acid dissociation constant for HCOOH, [A-] is concentration of formate ion (HCOO-), and [HA] is concentration of unreacted formic acid.

n(HCOO-) = n(NaOH) = 0.009 mol

V = 55.0 mL + 75.0 mL = 130 mL = 0.13 L

Therefore, concentration of unreacted formic acid is: [HA] = n(HCOOH remaining) / V = 0.00475 mol / 0.13 L = 0.0365 M

pH = pKa + log([A-]/[HA]) = -log(1.77 x 10⁻⁴ + log(0.009/0.0365) = 2.97

Therefore, resulting pH of the solution is approximately 2.97.

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To determine the number of 325 mg tablets of aspirin that would be deadly for a 60 lb child, we first need to convert the weight to kg.

1 lb is equal to 0.453592 kg. Therefore, a 60 lb child weighs approximately 27.2155 kg (60 x 0.453592).

The lethal dose of aspirin is 50 mg per kg of body weight. Therefore, for a 27.2155 kg child, the lethal dose would be 1,360.775 mg (27.2155 x 50).

Each aspirin tablet is 325 mg. Therefore, the number of tablets that would be deadly for the child would be 4.19 (1,360.775 / 325).

However, it is important to note that even a slightly higher dose of aspirin can be harmful to a child, and it is never recommended to give aspirin to children without consulting a doctor first.

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Answer: The balanced chemical equation for the reaction between SO2 and O2 is:

2 SO2 + O2 → 2 SO3

According to the equation, 1 mole of O2 reacts with 2 moles of SO2 to form 2 moles of SO3.

To determine which substance is the limiting reactant, we need to calculate the amount of product that can be formed by each reactant and choose the reactant that produces the least amount of product.

First, we need to determine the number of moles of SO2 and O2 present:

Number of moles of SO2 = mass / molar mass = 20 g / 64.06 g/mol = 0.312 moles

Number of moles of O2 = mass / molar mass = 20 g / 32.00 g/mol = 0.625 moles

Now we can calculate the amount of product formed by each reactant:

Amount of SO3 formed from SO2 = 0.312 moles × (2 moles SO3 / 2 moles SO2) × (80.06 g/mol SO3) = 12.48 g SO3

Amount of SO3 formed from O2 = 0.625 moles × (2 moles SO3 / 1 mole O2) × (80.06 g/mol SO3) = 100.10 g SO3

From the calculations, we can see that the limiting reactant is SO2, as it produces the least amount of product (12.48 g of SO3). Therefore, 12.48 g of SO3 is formed when 20 g of both SO2 and O2 are reacted.

Explanation:

At 273 K and 1 atm, the helium gas's volume is [tex]4.33 * 10^{-23} L[/tex] .

The volume of a gas can be calculated using the Ideal Gas Law, which states that PV = nRT,

where V is the gas's volume, n is its moles in existence, R is the ideal gas constant (8.314 J/mol K), T is the gas's temperature in Kelvin, and P is the gas's atmospheric pressure.

Given that the number of moles of the gas is 1.505 x 10-23 and the temperature is 273 K (0°C), we can rearrange the equation to solve for V:

[tex]V = \frac{nRT}{P}\\[/tex]

[tex]V = \frac{(1.505 * 10^{-23})(8.314 J/mol-K)(273 K)}{(1 atm)}[/tex]

[tex]V = 4.33 * 10^{-23} L[/tex]

Therefore, the volume of the helium gas at 273 K and 1 atm is [tex]4.33 * 10^{-23} L[/tex]

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Answer: To perform the conversions, we can use the following conversion factors:

1 atm = 760 mmHg

1 atm = 101.325 kPa

1 atm = 14.696 psi

1 atm = 101325 Pa

1 Torr = 1/760 atm

1 Pa = 1/101325 atm

Using these conversion factors, we can perform the conversions as follows:

958.5 mmHg = 958.5/760 atm = 1.2625 atm (rounded to 4 decimal places)

2.325 atm = 2.325 x 760 Torr = 1767 Torr (rounded to the nearest whole number)

444.4 kPa = 444.4/101.325 atm = 4.3817 atm (rounded to 4 decimal places)

1427.2 mmHg = 1427.2/760 atm = 1.8789 atm

= 1.8789 x 101325 Pa = 190694.87 Pa (rounded to 2 decimal places)

Therefore, the conversions are:

958.5 mmHg = 1.2625 atm

2.325 atm = 1767 Torr

444.4 kPa = 4.3817 atm

1427.2 mmHg = 190694.87 Pa

The conversions is given as: 958.5 mmHg=1.26 atm, 2.325 atm=1767.9 Torr, 444.4 kPa=4.381 atm and 1427.2 mmHg= 190237.2 Pa

Conversions refer to the process of changing a quantity or value from one unit of measurement to another. It involves converting the numerical value while maintaining the same physical quantity.

1 atm = 760 mmHg (Torr)

1 atm = 101.325 kPa

1 mmHg (Torr) = 133.322 Pa

Converting 958.5 mmHg to atm:

958.5 mmHg × (1 atm / 760 mmHg) = 1.26 atm

Converting 2.325 atm to Torr:

2.325 atm ×(760 mmHg / 1 atm) = 1767.9 Torr

Converting 444.4 kPa to atm:

444.4 kPa × (1 atm / 101.325 kPa) = 4.381 atm

Converting 1427.2 mmHg to Pa:

1427.2 mmHg × (133.322 Pa / 1 mmHg) = 190237.2 Pa

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The solution has a pH of around 5.93.

When a weak acid or a weak base is applied in modest amounts, buffer solutions withstand the pH shift. A buffer made of a weak acid and its salt is an example of which is an acetic acid and sodium acetate solution (CH3COOH + CH3COONa).

The weak acid is then partially dissociated in water, resulting in the conjugate base and hydrogen ions:

CH3COOH + H2O ⇌ H3O+ + CH3COO-

The acid dissociation constant, Ka, which is what this reaction's equilibrium constant is, is as follows:

Ka = [H3O+][CH3COO-]/[CH3COOH]

The Henderson-Hasselbalch equation may be used to determine the pH of a solution:

pH = pKa + log([A-]/[HA])

To begin with, we must figure out how much CH3COOH is present in the solution:

moles of CH3COOH = M x V = 0.15 mol/L x 0.050 L = 0.0075 mol

mass of CH3COOH = moles x molar mass = 0.0075 mol x 60.05 g/mol = 0.450 g

After adding sodium acetate, the solution's residual CH3COOH will be:

0.450 g - 1.00 g

= -0.55 g

The amount of sodium acetate supplied may be used to determine the CH3COO- concentration:

moles of CH3COO-=1.00g/82.03 g/mol

=0.0122 mol

The concentration of CH3COO- in the solution will be:

0.0122 mol/0.050 L=0.244 M

The Henderson-Hasselbalch equation may now be used to determine the pH of the solution:

pH = pKa + log([A-]/[HA])

pKa = -log(Ka) = -log(1.75 x 10⁻⁵) = 4.756

[A-]/[HA] = [CH3COO-]/[CH3COOH]

= 0.244 M / 0.0075 M = 32.53

pH = 4.756 + log(32.53)

= 5.93

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Answer: Oxygen

Explanation: Its found on the periodic table as an element.

you need to add 1.79 mL of 3.0 M HCl to react with 0.45 g of NaHCO3 and produce the most NaCl.

To determine how much 3.0 M HCl is needed to react with 0.45 g of sodium hydrogen carbonate (NaHCO3) and get the most NaCl, you need to first calculate the number of moles of NaHCO3 that you have:

molar mass of NaHCO3 = 84.01 g/mol

moles of NaHCO3 = mass / molar mass = 0.45 g / 84.01 g/mol = 0.00536 mol

Next, you need to determine the stoichiometry of the reaction between NaHCO3 and HCl. The balanced chemical equation for this reaction is:

NaHCO3 + HCl → NaCl + H2O + CO2

From this equation, you can see that one mole of NaHCO3 reacts with one mole of HCl to produce one mole of NaCl. Therefore, you need 0.00536 moles of HCl to react with 0.00536 moles of NaHCO3.

To calculate the volume of 3.0 M HCl needed to provide 0.00536 moles of HCl, you can use the following equation:

moles of solute = concentration x volume of solution (in liters)

Rearranging this equation to solve for the volume of solution gives:

the volume of solution = moles of solute/concentration

Plugging in the values gives:

volume of solution = 0.00536 mol / 3.0 mol/L = 0.00179 L or 1.79 mL

Therefore, you need to add 1.79 mL of 3.0 M HCl to react with 0.45 g of NaHCO3 and produce the most NaCl.

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Martha needs to use 0.294 liters or 294 milliliters of the 1.25 M H₂SO4 solution to obtain 36 grams of H₂SO4.

What is Chemical Reaction?

In a chemical reaction, the atoms and molecules of the reactants are rearranged to form new compounds or products. Chemical reactions involve the breaking and forming of chemical bonds between atoms and molecules, which involves the absorption or release of energy.

We can use the formula:

to find the volume of the 1.25 M H₂SO4 solution that contains 36 grams of H₂SO4.

First, we need to calculate the number of moles of H₂SO4 in 36 grams:

molar mass of H₂SO4 = 2 x atomic mass of H + atomic mass of S + 4 x atomic mass of O

= 2 x 1.008 + 32.06 + 4 x 16.00

= 98.08 g/mol

moles of H₂SO4 = mass / molar mass

= 36 g / 98.08 g/mol

= 0.3675 mol

Now we can use the formula above to solve for the volume of the solution:

1.25 M = 0.3675 mol / volume (in liters)

volume (in liters) = 0.3675 mol / 1.25 M

= 0.294 L

= 294 mL

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Answer: Na2CO3(aq) + CuCl2(aq) → 2 NaCl(aq) + CuCO3(s).

Explanation:

Answer:the concetraion of chrolune decrease

Explanation:because the chrolune not stable