If 3.60 g of NaHSO4 react, what is the change in enthalpy for the reaction, in kilojoules?
2NaHSO4(s)⟶Na2SO4(s)+H2O(g)+SO3(g)ΔH=−231.3 kJ

Answer:

0.35moles

Explanation:

when 156g of Al reacts with 2molesof Al2O3 then 27g of Al reacts with what then u cross multiply and solve ur answer

0.35moles of  Al[tex]_2[/tex]O[tex]_3[/tex]  will be formed when 27 grams of Al reacts completely with O[tex]_2[/tex]. A mole consists of precisely 6.022× 10²³particles.

A mole is just a measuring scale. In reality, it's one of the International System of Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. The levels at which chemical reactions frequently occur exclude the use of grams, yet utilizing actual numbers of atoms, molecules, or ions would also be unclear.

A mole consists of precisely 6.022× 10²³particles. The "particles" might be anything, from tiny things like electrons and atoms to enormous things like stars or elephants.

4 Al + 3 O[tex]_2[/tex] → 2 Al[tex]_2[/tex]O[tex]_3[/tex]

moles of aluminium = 27 /26=1.03moles

The mole ratio between Al and  Al[tex]_2[/tex]O[tex]_3[/tex] is 2:1

mole of  Al[tex]_2[/tex]O[tex]_3[/tex]= 0.35moles

Therefore, 0.35moles of  Al[tex]_2[/tex]O[tex]_3[/tex]  will be formed when 27 grams of Al reacts completely with O[tex]_2[/tex].

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Answer:

22.989769 u

Explanation:

The atomic weight of any atom can be found by multiplying the abundance of an isotope of an element by the atomic mass of the element and then adding the results together. This equation can be used with elements with two or more isotopes: Carbon-12: 0.9889 x 12.0000 = 11.8668. Carbon-13: 0.0111 x 13.0034 = 0.1443.

True. Tetraphosphorus (P4), commonly known as white phosphorus, can form different compounds with chlorine (Cl2) depending on the amount of chlorine present. When chlorine is limited, it forms phosphorus trichloride (PCl3).

White phosphorus, or tetraphosphorus (P4), is a highly reactive and toxic allotrope of phosphorus. When it reacts with chlorine, it can form various compounds. In the case where chlorine is limited or not in excess, the reaction between P4 and Cl2 leads to the formation of phosphorus trichloride (PCl3). Phosphorus trichloride is a colorless and volatile liquid compound that is used in various chemical processes and as a reagent in organic synthesis. It is important to note that in excess chlorine, different compounds such as phosphorus pentachloride (PCl5) can be formed.

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To calculate the amount of plutonium-239 remaining after 72,900 years, we need to determine the number of half-lives that have passed. Given that the half-life of plutonium-239 is 24,300 years and 8 kg of this isotope was initially released, we can use the half-life formula to find the answer.

The number of half-lives can be calculated by dividing the total time elapsed (72,900 years) by the half-life of the isotope (24,300 years). In this case, the number of half-lives would be 72,900 years / 24,300 years = 3 half-lives. The remaining amount of plutonium-239 can be calculated by multiplying the initial amount (8 kg) by (1/2) raised to the power of the number of half-lives. Each half-life reduces the amount of plutonium-239 to half its previous value.

Remaining amount = initial amount × (1/2)^(number of half-lives)

Remaining amount = 8 kg × (1/2)^3

Remaining amount = 8 kg × (1/8)

Remaining amount = 1 kg

Therefore, after 72,900 years, there would be 1 kg (1000 grams) of plutonium-239 remaining from the initially released 8 kg.

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Nitrous acid ([tex]HNO_2[/tex]) would be more suitable for use in a solution buffered at pH 7.0.

To determine which acid, nitrous acid ([tex]HNO_2[/tex]) or hypochlorous acid (HClO), is more suitable for use in a solution buffered at pH 7.0, we need to compare their pKa values. The pKa is related to the Ka (acid dissociation constant) by the equation:

pKa = -log10(Ka)

Let's calculate the pKa values for nitrous acid and hypochlorous acid using the given Ka values:

For nitrous acid ([tex]HNO_2[/tex]):

pKa = -log10(4.5×[tex]10^{(-4)[/tex])

= -log10(4.5) - log10([tex]10^{(-4)[/tex])

= -log10(4.5) + 4

For hypochlorous acid (HClO):

pKa = -log10(3.0×[tex]10^{(-8)[/tex])

= -log10(3.0) - log10([tex]10^{(-8)[/tex])

= -log10(3.0) + 8

Comparing the pKa values, we find:

pKa ([tex]HNO_2[/tex]) = -log10(4.5) + 4

pKa (HClO) = -log10(3.0) + 8

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Answer: you go down by your key bad and use those arrows

Explanation:

Answer:

Density of cube = 1.59 × 10-⁴ kg/cm³

Explanation:

From the question, the dimensions of the cube are as follows:

Iength, l =0 .045 m, width, w = 0.45dm, height, h = 4.5 mm.

It's mass is 1.45 X 104 mg. What is this cube's density in Kg/cm?

First, all units of length are converted to cm and mass is converted to Kg.

L = 0.045 m = 0.045 m × 100 cm/m = 4.5 cm;

W = 0.45 dm = 0.45 dm × 10 cm/dm = 4.5 cm

Since it is a cube, the height, h = 4.5 cm not 4.5 mm

Mass of cube = 1.45 × 10⁴ mg = 1.45 × 10⁴ mg × 1 × 10-⁶ kg/mg = 0.0145 kg

Density = mass/volume

Volume of cube = s³ or l × w × h

Volume of cube = 4.5 cm × 4.5 cm × 4.5 cm = 91.125 cm³

Density of cube = 0.0145 kg / 91.125 cm³

Density of cube = 1.59 × 10-⁴ kg/cm³

Answer:

okie

Explanation:

imma girl

The limiting reactant in the reaction, given that 5.00 g of NaCL reacted with 10.0 mL of 5 M H₂SO₄ is NaCl

First, we shall obtain the mole of 5.00 g of NaCl. Details below:

Mole of NaCl = mass / molar mass

= 5 / 58.44

= 0.09 mole

Next, we shall obtain the mole of 10.0 mL of 5 M H₂SO₄. Details below:

Mole of H₂SO₄ = molarity × volume

= 5 × 0.01

= 0.05 mole

Finally, we shall determine the limiting reactant. Details below:

2NaCl + H₂SO₄ -> Na₂SO₄ + 2HCl

From the balanced equation above,

2 moles of NaCl reacted with 1 mole of H₂SO₄

Therefore,

0.09 mole of NaCl will react with = (0.09 × 1) / 2 = 0.045 mole of H₂SO₄

We can see from the above that only 0.045 mole of H₂SO₄ out of 0.05 mole is needed to react completely with 0.09 mole of NaCl.

Thus, we can conclude that the limiting reactant for the reaction is NaCl

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Answer:

units of length per time

Explanation:

Answer:

A and C

Explanation:

DNA is what makes up you and me and DNA is composed of four bases adenine, guanine, thymine, and cytosine. The others are not true.

To drive the equilibrium in the reaction mixture towards the product, manipulate the reaction conditions and adjust the reaction parameter.

Adjusting reaction conditions to drive the equilibrium towards the desired product. By manipulating various factors such as temperature, pressure, concentration, and catalysts, it is possible to shift the equilibrium in a chemical reaction towards the product side. Altering these parameters can impact the forward and backward reaction rates, ultimately favoring the formation of the desired product.

For example, increasing the temperature may promote an endothermic reaction, while reducing the pressure or adjusting the concentration of reactants can help alleviate the impact of Le Chatelier's principle.

Additionally, introducing a catalyst can provide an alternative reaction pathway with lower activation energy, facilitating the production of the desired product. Understanding these principles and their application allows for strategic control over the equilibrium and the optimization of reaction conditions to maximize product yield.  

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The molar concentration of iodide ion (I⁻) in a saturated PbI₂ solution is 3 x 10⁻³ M.

To determine the molar concentration of iodide ion (I⁻) in a saturated PbI₂ solution, we need to consider the stoichiometry of the dissolution reaction of PbI₂ and use the solubility product constant (Ksp) for PbI₂.

The balanced equation for the dissolution of PbI₂ is:

PbI₂(s) ⇌ Pb²⁺(aq) + 2I⁻(aq)

According to the stoichiometry of the balanced equation, every 1 mole of PbI₂ dissociates to produce 2 moles of iodide ions (I⁻). Therefore, the molar concentration of iodide ions can be calculated by multiplying the molar solubility of PbI₂ by 2.

Given that the molar solubility of PbI₂ is 1.5 x 10⁻³ M, the molar concentration of iodide ion in a saturated PbI₂ solution is:

2 x (1.5 x 10⁻³ M) = 3 x 10⁻³ M

Therefore, the molar concentration will be  3 x 10⁻³ M.

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--The given question is incomplete, the complete question is

"The Molar Solubility Of PbI₂ Is 1.5 X 10⁻³ M.A/ What Is The Molar Concentration Of Iodide Ion In A Saturated PbI₂ Solution?"--

Answer:

9.78x10^(-5) mol

Explanation:

To convert molecules to moles, divide the # of molecules by 6.02x10^23.

5.89x10^19 / 6.02x10^23 = 9.78x10^(-5) mol

Answer:

A

Explanation:

the boat does not have a force to counter act the boys it must give which means it moves cause it is one something that is not as dense as the boy (I THINK)

Answer:

what

Explanation:

Answer:

he ans she and he and she but she was he so how was he

Explanation:

The change in internal energy (ΔU) of the system is 320 kJ.

The change in internal energy (ΔU) of a system can be calculated using the first law of thermodynamics, which states that the change in internal energy of a system is equal to the heat added to the system minus the work done by the system:

ΔU = Q - W

where ΔU is the change in internal energy, Q is the heat added to the system, and W is the work done by the system.

In this case, the system does 566 kJ of work (W = -566 kJ) and loses 246 kJ of heat to the surroundings (Q = -246 kJ). The negative sign indicates that the work is done by the system and the heat is lost by the system.

Substituting the values into the equation:

ΔU = -246 kJ - (-566 kJ)

= -246 kJ + 566 kJ

= 320 kJ

Therefore, the change in internal energy (ΔU) of the system is 320 kJ.

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Answer:

d

Explanation:

If the concentration of chloride ions (Cl-) is higher outside the cell compared to inside, and the membrane is only permeable to Cl- ions, the correct statement would be:

"Cl- ions will move from the higher concentration outside the cell to the lower concentration inside the cell through the membrane until equilibrium is reached."

This movement of ions occurs due to the principle of diffusion. Diffusion is the passive movement of particles from an area of higher concentration to an area of lower concentration. In this case, since the membrane is permeable only to Cl- ions, they will be the only particles involved in this process. As Cl- ions are more concentrated outside the cell, they will move across the membrane, down their concentration gradient, into the cell. This movement will continue until the concentrations of Cl- ions inside and outside the cell become equal, reaching equilibrium. It's important to note that this process does not require the input of energy, as it occurs spontaneously due to the concentration difference. However, the movement of Cl- ions may have implications for the overall electrochemical balance of the cell, potentially affecting other ion concentrations and membrane potential.

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Answer:

A, C, D

Explanation:

To selectively dissolve iron(III) hydroxide while leaving lead(II) hydroxide unaffected, pH control is used by adjusting the solution to be more basic, exploiting the difference in solubility behavior of the two hydroxides at different pH levels.

To calculate the pH at which a precipitate of iron(III) hydroxide will begin to dissolve, we need to use the solubility product constant (Ksp) for iron(III) hydroxide[tex](Fe(OH)_{3} )[/tex] and the concentration of iron in the solution.

b. To separate lead and iron if they were both precipitated as their hydroxides, pH control can be employed. By adjusting the pH, one of the hydroxide precipitates can be selectively dissolved while the other remains insoluble.

The solubility of a metal hydroxide is typically dependent on the pH of the solution due to the formation of hydroxide complexes or the presence of competing species.

For example, lead(II) hydroxide [tex](Pb(OH)_{2} )[/tex]has low solubility in neutral or slightly basic conditions, while iron(III) hydroxide[tex](Fe(OH)_{3} )[/tex]is more soluble at higher pH values.

Therefore, if both lead and iron hydroxide precipitates are formed, adjusting the pH to be more basic will selectively dissolve the iron(III) hydroxide precipitate while leaving the lead(II) hydroxide precipitate relatively unaffected.

This separation can be achieved by adding a basic solution, such as sodium hydroxide (NaOH), to increase the pH. The lead(II) hydroxide will remain insoluble while the iron(III) hydroxide will dissolve into solution due to the formation of soluble hydroxide complexes.

By carefully controlling the pH, the two metal hydroxide precipitates can be separated.

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Answer: 130 ppm Pb

Explanation:

We use parts per million to express the concentrations of solutions that contain very, very small amounts, often called trace amounts, of a given solute.

More specifically, a solution's concentration in parts per millions tells you the number of parts of solute present for every

10

6

=

1

,

000

,

000

parts of solution. You can thus say that a

1 ppm

solution will contain exactly

1 g

of solute for every

10

6

g

of solution.

In your case, you know that you have

38

mg Pb

⋅

1 g

10

3

mg

=

3.8

⋅

10

−

2

.

g Pb

in exactly

300.0 g

=

3.000

⋅

10

2

.

g solution

This means that you can use this known composition as a conversion factor to scale up the mass of the solution to

10

6

g

10

6

g solution

⋅

3.8

⋅

10

−

2

.

g Pb

3.000

⋅

10

2

g solution

=

130 g Pb

Since this represents the mass of lead present in exactly

10

6

g

of solution, you can say that the solution has a concentration of

concentration

ppm

=

130 ppm Pb

−−−−−−−−−−−−−−−−−−−−−−−−−−−−

The answer is rounded to two sig figs, the number of sig figs you have for the mass of lead present in the sample.

We require 0.896 moles of HgO to produce 0.896 moles of O2.

The balanced chemical equation for the given reaction is;HgO(s) → Hg(l) + O2(g)We can calculate the number of moles of HgO(s) required to produce 0.896 moles of O2(g) using stoichiometry.To use stoichiometry we need to know the mole ratio of O2 to HgO in the above reaction.Based on the balanced chemical equation, the ratio of HgO to O2 is 1:1.This means that 1 mole of HgO will produce 1 mole of O2.Therefore, the number of moles of HgO required to produce 0.896 moles of O2 is also 0.896 moles.150 words explanation:To calculate the number of moles of HgO required to produce 0.896 moles of O2 we can use the mole ratio of the two compounds in the balanced chemical equation.HgO(s) → Hg(l) + O2(g)From the equation, the ratio of HgO to O2 is 1:1. This means that 1 mole of HgO will produce 1 mole of O2.If we have 0.896 moles of O2, we will require the same number of moles of HgO to produce the O2. Therefore, we require 0.896 moles of HgO to produce 0.896 moles of O2.

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Answer:

ITS TRUE!!!!!

One mole of C₆H₁₂O₆ is consumed when 6.0 moles O₂ are used in the reaction.

The balanced chemical equation for the reaction is: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O

For every 6 moles of oxygen gas consumed, one mole of glucose is consumed. The molar ratio of C₆H₁₂O₆ to O₂ is 1:6.The amount of moles of C₆H₁₂O₆ consumed when 6.0 moles O₂ are used is given by:Moles of C₆H₁₂O₆ = Moles of O₂ ÷ 6Moles of C₆H₁₂O₆ = 6.0 ÷ 6Moles of C₆H₁₂O₆ = 1.0

Therefore, one mole of C₆H₁₂O₆ is consumed when 6.0 moles O₂ are used in the reaction.Given that the chemical equation for the reaction is: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O

The stoichiometric coefficient of O₂ is 6, which means that for every 6 moles of O₂ consumed, one mole of glucose is consumed.The molar ratio of C₆H₁₂O₆ to O₂ is 1:6.

The amount of moles of C₆H₁₂O₆ consumed when 6.0 moles O₂ are used can be calculated by using the molar ratio.Moles of C₆H₁₂O₆

= Moles of O₂ ÷ 6Moles of C₆H₁₂O₆

= 6.0 ÷ 6Moles of C₆H₁₂O₆

= 1.0

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The answer is B. propyl group.A large doublet and a small septet pattern in ¹H NMR spectroscopy indicate the presence of a propyl group in the molecule being analyzed.

In ¹H NMR (proton nuclear magnetic resonance) spectroscopy, the number and arrangement of signals in the spectrum provide information about the chemical environment and connectivity of hydrogen atoms in a molecule. A large doublet and a small septet pattern in ¹H NMR is characteristic of a propyl group.

A propyl group consists of three carbon atoms connected in a chain, with a hydrogen atom attached to each carbon atom. The large doublet arises from the neighboring hydrogens (vicinal protons) on the middle carbon atom, which split the signal into two peaks of equal intensity. The small septet arises from the hydrogens on the two terminal carbon atoms, which split the signal into seven peaks with intensity ratios of 1:6:6:6:6:6:1.

An ethyl group (A) consists of two carbon atoms and does not exhibit a septet pattern. An isopropyl group (C) consists of three carbon atoms but has a different arrangement of hydrogens, leading to a different splitting pattern in the NMR spectrum. A phenyl group (D) is an aromatic ring and typically exhibits different patterns in the NMR spectrum.

A large doublet and a small septet pattern in ¹H NMR spectroscopy indicate the presence of a propyl group in the molecule being analyzed. This pattern arises from the chemical shifts and splitting of hydrogens within the propyl group's carbon chain.

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Option (a) is the most true statement based on the provided data, and further testing is needed to identify the specific anion in the unknown solution.

Based on the provided data, the student observed a yellow precipitate when reacting the unknown with the four hypothetical cations A, B, C, and D.

This suggests that the unknown anion is capable of forming a yellow precipitate with these cations. However, without further information or additional tests, it is not possible to definitively conclude the identity of the unknown anion.

Option (a) states that more tests would need to be performed to identify the anion in the unknown. This is the most accurate statement based on the given data. The observed yellow precipitate narrows down the possibilities but does not provide enough information to determine whether the unknown anion is X or Y. Additional tests or data would be required to make a conclusive identification.

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