what’s the answer please

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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The energy in joules of one mole of photons of visible light having a wavelength of 4.11×10^2 nm? can be expressed as 2.9*10^5 J

From the question we were told to find the energy and the parameters that is needed to calculate these are;

c=3*10^8

h= 6.626 * 10^-34 J.s

1 mol photons = 6.023x10^23 photon

λ = 4.11×10^2 nm  = 4.11 × 10-7 meters

The parameters can be input  as Energy of one mole photon (E) = ( 6.023x10^23 * 6.626 * 10^-34 * 3*10^8)/ (4.11 × 10^-7)

=291302

=2.9*10^5 J

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By using filtration, the sand and fine salt can be effectively separated based on their difference in particle size, providing a clean separation of the two components.

Filtration is a separation technique that takes advantage of the difference in particle size between sand and salt. It involves passing the mixture through a porous material, such as filter paper or a filter funnel, which allows the liquid (saltwater) and small salt particles to pass through while retaining the larger sand particles.

Here's how the filtration process can be carried out:

1. Set up a filter apparatus with a funnel and filter paper or a filter flask.

2. Place the mixture of sand and salt in a beaker or a flask.

3. Slowly pour the mixture into the filter paper or funnel, allowing the liquid (saltwater) to pass through while retaining the sand on the filter paper.

4. Once the liquid has passed through completely, the sand will be left behind on the filter paper or in the filter flask.

5. Carefully remove the sand from the filter paper or filter flask, and the saltwater solution can be collected separately.

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There will be "no apparent reaction" when sodium hydroxide and sodium chloride react.

While NaCl is a salt, NaOH is a potent alkali. There is no chemical reaction between these two substances. Nothing. There isn't any response.

Thus, there will be "no apparent reaction" when sodium hydroxide and sodium chloride react.

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The complete question is-

Reaction of sodium hydroxide with sodium chloride will produce ______.

The reaction the reversible reaction is given as :

6CO₂    +    6H₂O   + Heat    ⇄     C₆H₁₂O₆    +    6O₂

The photosynthesis is to convert carbon dioxide and water and light in into glucose and oxygen.

photosynthesis :

6CO₂    +    6H₂O   + Heat    ------>     C₆H₁₂O₆    +    6O₂

In cellular respiration organism release energy stored in the chemical bond of glucose.

C₆H₁₂O₆    +    6O₂   ----->  6CO₂    +    6H₂O   + Heat    

The reversible reaction can be as follows :

6CO₂    +    6H₂O   + Heat    ⇄     C₆H₁₂O₆    +    6O₂

                       reactants                      products

C                             6                                6

H                             12                                12

O                             18                                 18

The number of atoms present in reactant side is equal to the number of atom in product side. the equation is balanced.

6 moles of carbon dioxide produce 1 mole of oxygen

6 mole of water produce 1 mole of carbon dioxide

Thus, the reversible reaction given as:

6CO₂    +    6H₂O   + Heat    ⇄     C₆H₁₂O₆    +    6O₂

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We can determine the relative atomic ratios in a compound using an empirical formula.

The complete question is,

How does the empirical formula inform us?

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Following best describes the purpose and outcome of demonstration: This is demonstration of Boyle's law. As volume increases, the pressure decreases and marshmallow will grow larger.

Gas laws are set of fundamental principles that describe the behavior of gases under different conditions of temperature, pressure, and volume.

These laws include Boyle's law, Charles's law, Gay-Lussac's law, and the combined gas law. These laws help to predict the behavior of gases in different situations and can be used to determine properties such as temperature, pressure, volume, and the number of moles of gas present.

Boyle's Law explains that volume of gas increases as the pressure decreases.

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A solution containing a KCl dissolved in water will have a higher boiling point and a lower freezing point than that of pure water.

Elevation in boiling point is a phenomenon that describe the boiling point of a liquid will be higher when another compound is added. Which means a solution has higher boiling point than pure solvent .

Depression in freezing point is a phenomenon that describe the freezing point of a liquid will be lower when another compound is added. Which means a solution has lower freezing point than pure solvent.

Thus, The boiling point and the freezing point of a solution of KCl in water will be greater and lower, respectively, than that of pure water.

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Answer:

A hydrocarbon is any of a class of organic chemicals made up of only the elements carbon (C) and hydrogen (H). The carbon atoms join together to form the framework of the compound, and the hydrogen atoms attach to them in many different configurations.

Answer:

A hydrocarbon is an organic chemical compound composed exclusively of hydrogen and carbon atoms. Hydrocarbons are naturally-occurring compounds and form the basis of crude oil, natural gas, coal, and other important energy sources.

Two substituents are taken out of the reactant molecule in an elimination reaction to create the product.

In a one- or two-step method, two substituents are eliminated from a molecule in an organic reaction known as an elimination reaction. Atoms are eliminated as molecules and compounds during an elimination reaction. Two substituents are taken out of the reactant molecule in an elimination reaction to create the product. A metal, an acid, or a base typically catalyze elimination. E1 and E2 reactions are the two primary categories of elimination processes in organic chemistry. Both E1 and E2 processes are also known as alcohol elimination reactions and alkyl halide elimination reactions, respectively. Any organic chemical reaction known as an elimination reaction in which two atoms and groups of atoms are eliminated.

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0.6 is the equilibrium constant for the given reaction.

To calculate the equilibrium constant (K) for the given reaction, we need to use the molar concentrations of the reactants and products at equilibrium. The equilibrium constant expression is given by:

\(K= [H_{2}O]^{2} / ([H_{2}^{2} * [O_{2}])\)

Given the moles of H2, O2, and H2O in the 8.1 L container, we can convert them to molar concentrations by dividing the number of moles by the volume:

[H2] = 1.83 moles / 8.1 L

[O2] = 2.33 moles / 8.1 L

[H2O] = 3.95 moles / 8.1 L

Substituting these values into the equilibrium constant expression, we have:

K = \((3.95 / 8.1)^{2}\) / (\((1.83 / 8.1)^{2}\) * (2.33 / 8.1))

Evaluating this expression and rounding to one decimal place, we find the equilibrium constant to be:

K ≈ 0.6

Therefore, the equilibrium constant for the given reaction is approximately 0.6.

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There are approximately 6.022 × 10^23 atoms in 12 grams of Carbon-12 (12C).

The number of atoms in a given amount of a substance can be calculated using Avogadro's number, which represents the number of atoms or molecules in one mole of a substance. Avogadro's number is approximately 6.022 × 10^23.

Carbon-12 is a specific isotope of carbon, with an atomic mass of 12 atomic mass units (amu). One mole of Carbon-12 has a mass of 12 grams. Since one mole of any substance contains Avogadro's number of particles, in the case of Carbon-12, it contains 6.022 × 10^23 atoms.

Therefore, if we have 12 grams of Carbon-12, which is equal to one mole, we can conclude that there are approximately 6.022 × 10^23 atoms in this amount of Carbon-12.

In summary, 12 grams of Carbon-12 contains approximately 6.022 × 10^23 atoms. Avogadro's number allows us to relate the mass of a substance to the number of atoms or molecules it contains, providing a fundamental concept in chemistry and enabling us to quantify and understand the microscopic world of atoms and molecules.

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Answer:

yes

Explanation:

the number of protons in the nucleus of an atom determines the type element: the number of protons in an element is the atomic number on the periodic table (number at the top)

Each atom has characteristic number of protons present in it's nucleus which is unique for that element.

An element  is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.

Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.

The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.

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The calculated formula masses to 133.5 amu, we find that the substance with a formula mass closest to 133.5 amu is (d) AlCl3. Therefore, the answer is option D.

To identify the substance with a formula mass of 133.5 amu, we need to calculate the formula mass of each given substance and compare it to 133.5 amu.

(a) MgCl2:

The formula mass of MgCl2 can be calculated by adding the atomic masses of magnesium (Mg) and chlorine (Cl).

Mg: atomic mass = 24.31 amu

Cl: atomic mass = 35.45 amu

Formula mass of MgCl2 = (24.31 amu) + 2(35.45 amu) = 95.21 amu

(b) SCl:

The formula mass of SCl can be calculated by adding the atomic masses of sulfur (S) and chlorine (Cl).

S: atomic mass = 32.07 amu

Cl: atomic mass = 35.45 amu

Formula mass of SCl = 32.07 amu + 35.45 amu = 67.52 amu

(c) BCl:

The formula mass of BCl can be calculated by adding the atomic mass of boron (B) and chlorine (Cl).

B: atomic mass = 10.81 amu

Cl: atomic mass = 35.45 amu

Formula mass of BCl = 10.81 amu + 35.45 amu = 46.26 amu

(d) AlCl3:

The formula mass of AlCl3 can be calculated by adding the atomic mass of aluminum (Al) and 3 times the atomic mass of chlorine (Cl).

Al: atomic mass = 26.98 amu

Cl: atomic mass = 35.45 amu

Formula mass of AlCl3 = 26.98 amu + 3(35.45 amu) = 133.78 amu. Option D

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Answer:

D it is right ..............

Percentage denotes a quantity per million ( ppm, where a part for a solution is a unit of mass (g, g, g, kg, et.) or capacity (L, mL, L, etc.). The quantity expressed in percent solutions

What stage is a solution in?

When the solvent makes up a significant portion of the combination, as is frequently the case, the solution typically has the condition of the solvent. The concentration of a solution, which measures how much solute is present in a specific volume of solution or solvent, is one crucial parameter. When water is one of the solvents, the phrase "aqueous solution" is used.

What material is dissolving in the solution to create a solution?

A solute is the material that dissolves in a solvent to create a solution. It is less prevalent in the solution than the solvent. A solvent is a substance that is present in a solution that dissolves a solute. It is more prevalent than the solute in solution. If we use a saltwater solution.

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Based on the given data, the amount of products from 5.00 g of KClO₃ is:

The decomposition of KClO₃ is given by the equation below:

2 KClO₃  -----> 2 KCl + 3 O₂

2 moles of KClO₃ produces 2 moles of KCl and 3 moles of O₂

Molar mass of KClO₃ is 122.5 g/mol

molar mass of KCl = 74.5 g

molar mass of O₂ = 32 g

Moles of KClO₃ in 5.00 g = 5.00/122.5

For KCl

a. moles: 0.04 moles of KClO₃ will produce 0.04 moles of KCl

b. mass of KCl = 0.04 * 74.5 = 2.98 g KCl

c. number of molecules of KCl = 0.04 * 6.02 * 10²³ = 2.41 * 10²² molecules of KCl

For O₂:

a. moles of O₂; 0.04 moles of KClO₃ will produce = 0.06 moles of O₂.

b. mass of O₂ = 0.06 * 32 g = 1.92 g of O₂

c. number of molecules: 0.06 * 6.02 * 10²³ = 3.61 * 10²² molecules of O₂

Therefore, the amount of products from 5.00 g of KClO₃ is:

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Answer:

Filter it

Explanation:

9.77 litres of NO2 are generated on average.

The balanced equation for the breakdown of N2O5 is as follows:

\(2N_2O_5(g) -- > 4NO_2(g) + O_2(g)\)

determine how many moles of N2O5 decompose:

\(V(N_2O_5) / Vm = n(N_2O_5)(N_2O_5)\)

where V(N2O5) = 4.86 dm3 is N2O5's volume and Vm(N2O5) is N2O5's molar volume under the circumstances stated in the ideal gas law:

\((R*T)/P = Vm = V/n\)

when the gas constant R is used.

the kelvin scale of temperature, T

The pressure is P.

The ideal gas law:

\(n(N_2O_5) = V(N2O5) / Vm(N_2O_5) = 4.86 dm3 / (24.46 L/mol) = 0.1982 mol\)

the number of moles of NO2 is:

\(n(NO_2 = 4/2 * n(N_2O_5) = 0.3964 mol\)

then,

\(n(NO_2 = 4/2 * n(N_2O_5) = 0.3964 mol\)

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Answer:

Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. This is normally taken as the definition of inertia. ... If that velocity is zero, then the object remains at rest.

Explanation:

Answer:

Before Galileo and Newton, many people thought that objects lost speed because they had a built-in natural tendency to do so. But those people weren't taking into account the multiple forces here on Earth - for example, friction, gravity, and air resistance - that cause objects to change their speed. If we could see the motion of an object in deep interstellar space, we would be able to observe the natural tendencies of an object that is free from any external influence. In deep interstellar space we would observe that if an object had a speed, it would continue to move with that speed until there was some force causing a change in its motion. Likewise, if an object were at rest in interstellar space, it would remain at rest until there was a force causing a change in its motion.

Explanation:

Hope it helped you =)

Answer:

True

Explanation:

had the same question

Answer:

A blue-eyed man and a brown-eyed woman have two children, both of whom have brown eyes.

Explanation:

Answer:

3

Explanation:

Therefore, the percentage of P in NH₄H₂PO₄ is 46.3%.

Molecular is a branch of science that focuses on the study of molecules and their interactions with other molecules and their environment. It is the smallest unit of matter and is studied by chemists, physicists, and biologists. Molecular science explores the structure, properties, and behavior of atoms, molecules, and the interactions between them. It also studies how molecules interact with energy and how they form and break down.

NH₄H₂PO₄ is an ammonium phosphate salt composed of ammonium (NH₄+), hydrogen (H+), phosphorus (P) and oxygen (O).
The molecular weight of NH₄H₂PO₄ is 149.09 g/mol.
The molecular weight of P₂O₅ is 141.94 g/mol.
The amount of P in NH₄H₂PO₄ can be calculated by converting the molecular weight of NH₄H₂PO₄ to molecular weight of P₂O₅.
To do this, we divide the molecular weight of NH₄H₂PO₄ (149.09 g/mol) by the molecular weight of P₂O5 (141.94 g/mol), and then multiply the result by the percentage of P in P₂O5 (44.1%).

(149.09 g/mol / 141.94 g/mol) * 44.1% = 46.3%

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The new molarity is 1.73 M

The new molarity if 130.0 mL of water is added to 55.0 mL of a 5.82 M solution of LIOH.

MO = 2.00 M

MD=

MOVO = MDVD

VO = 55 mL, and

VD = 185 mL (55 + 130 mL).

M x 55 mL = 5.82 MD x 185 mL

MD = 5.82*55/185 = 1.73 M

The new molarity is 1.73 M.

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Answer:

The simplest chemical formula of the compound is Cu(C₆H₁₁O₇)₂

Explanation:

Given mass of sample = 1.4 g

mass of copper in the sample = 0.2 g

mass of the gluconate =1.4 - 0.2 = 1.2 g

The mole ratio is determined first using the formula;

mole ratio = reacting mass / atomic mass

atomic mass of copper = 63.55

mass of gluconate, C₆H₁₁O₇ = 12*6 + 1*11 + 16*7 = 195 g/mol

mole ratio ( copper : gluconate) = 0.2/63.55 : 1.4/195

mole ratio ( copper : gluconate) =  0.003 : 0.007

convert to whole number ratios by dividing with the smallest ratio

mole ratio ( copper : gluconate) = 0.003/0.003 : 0.007/0.003

mole ratio ( copper : gluconate) = 1 : 2

Therefore, the simplest chemical formula of the compound is Cu(C₆H₁₁O₇)₂