Help pls what is the (H+) of a solution with a pH of 4?
a. 1E-4 M
b. 0.602 M
c. 1E6 M
d. 1E4 M

The enthalpy change when 8.50 L of ozone at a pressure of 1.00 atm and 25°C reacts with 12.00 L of nitric oxide at the same initial pressure and temperature is -277.5 kJ/mol.

The enthalpy change when 8.50 L of ozone at a pressure of 1.00 atm and 25°C reacts with 12.00 L of nitric oxide at the same initial pressure and temperature can be calculated by the given equation. The balanced equation for the reaction is:2O3(g) + 2NO(g) → 2NO2(g) + 3O2(g)The enthalpy change for the given reaction can be determined using Hess’s law. Hess’s law states that the enthalpy change of a reaction is independent of the route taken, provided that the initial and final conditions are the same.

Since the given reaction can be expressed as a sum of a series of known reactions, Hess’s law can be used to calculate the enthalpy change.Using the given data, the enthalpy change for the reaction can be calculated as follows:δH° = 2 × [ΔH°f(NO2(g))] + 3 × [ΔH°f(O2(g))] - 2 × [ΔH°f(O3(g))] - 2 × [ΔH°f(NO(g))]δH° = 2 × [33.85 kJ/mol] + 3 × [0 kJ/mol] - 2 × [142.2 kJ/mol] - 2 × [90.4 kJ/mol]δH° = - 277.5 kJ/mol

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Answer:

The power plants

are inexpensive to build

To calculate the percent recovery for each component (basic, acidic, and neutral) and the percent error for the melting point of each component in Experiment 4C, specific formulas and calculations are required. The percent recovery is calculated by dividing the mass of the recovered component by the initial mass and multiplying by 100. The percent error for the melting point is calculated by comparing the experimental melting point to the accepted literature value and expressing the difference as a percentage of the accepted value.

To calculate the percent recovery for each component, you need to divide the mass of the recovered component by the initial mass and multiply by 100. Let's perform the calculations for each component:

a. Basic (Ethyl-4-amino benzoate):

Percent Recovery = (Recovered mass of basic component / Initial mass of basic component) x 100

Percent Recovery = (0.0137 g / 0.0498 g) x 100 = 27.51%

b. Acidic (Benzoic Acid):

Percent Recovery = (Recovered mass of acidic component / Initial mass of acidic component) x 100

Percent Recovery = (0.0322 g / 0.0588 g) x 100 = 54.76%

c. Neutral (9-fluorenone):

Percent Recovery = (Recovered mass of neutral component / Initial mass of neutral component) x 100

Percent Recovery = (0.0422 g / 0.0508 g) x 100 = 83.07%

To calculate the percent error for the melting point of each component, you need to compare the experimental melting point to the accepted literature value. The percent error is calculated using the formula:

Percent Error = ((Experimental melting point - Accepted melting point) / Accepted melting point) x 100

Let's perform the calculations for each component:

a. Basic (Ethyl-4-amino benzoate):

Percent Error = ((84.0°C - Accepted melting point) / Accepted melting point) x 100

b. Acidic (Benzoic Acid):

Percent Error = ((121.5°C - Accepted melting point) / Accepted melting point) x 100

c. Neutral (9-fluorenone):

Percent Error = ((82.0°C - Accepted melting point) / Accepted melting point) x 100

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Answer: Balanced forces

Explanation: Equal forces acting in opposite directions are called balanced forces. Balanced forces acting on an object will not change the object's motion.

Answer:

D. 18g

Explanation:

To get the answer, we will use an equation to convert the grams of C2H5OH to moles of C2H5OH, then I will convert the moles of C2H5OH to moles of CO2, and then I will convert the moles of CO2 to grams of CO2.

9.2g C2H5OH / 46.07g C2H5OH = 0.199 mol C2H5OH

0.199 mol C2H5OH (2 mol CO2 / 1 mol C2H5OH) = 0.398 mol CO2

0.398 mol CO2 (44.01g CO2 / 1 mol CO2) = 17.515g CO2

The answer closest to our answer is answer choice D. 18g

Therefore, the answer is D

In normal temperatures, carbon dioxide is a colorless, non-flammable gas, its calculated value is "18 gram".

Equation:

[tex]\to \bold{C_2H_5OH\ (l)+3O_2\ (g) \to 2CO_2\ (g)+3H_2O\ (g)}[/tex]

In the above-given scenario, We'll utilize an equation that converts grams of ethanol to moles of ethanol, then converts moles of ethanol to moles of carbon dioxide, and finally, transforms the moles of carbon dioxide into grams of carbon dioxide to get the result.

Following are the calculation of the conversion of carbon dioxide:

[tex]\to \frac{9.2\ g\ C_2H_5OH }{46.07\ g\ C_2H_5OH} = 0.199\ mol C_2H_5OH\\\\\to 0.199\ mol\ C_2H_5OH \ (\frac{2\ mol\ CO_2}{ 1\ mol\ C_2H_5OH}) = 0.398\ mol\ CO_2\\\\\to 0.398\ mol \ CO_2 \ (\frac{44.01\ g\ CO_2}{1 \ mol\ CO_2}) = 17.515\ g\ CO_2 \approx 18\ g \ CO_2\\\\[/tex]

Therefore, the answer is "Option D".

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If the scientist intends to apply the combined gas law to determine various attributes, the following statement is accurate: (A) The pressure must remain at 200 kPa, but the volume, temperature, and amount can change.

Among the statements provided:

A. The statement "The pressure must stay at 200 kPa, but the volume, temperature, and amount can change" is true regarding the remainder of the experiment if the scientist wants to use the combined gas law to calculate different properties. In the combined gas law, the pressure is a constant value, while the volume, temperature, and amount of gas can vary.

B. The statement "The volume must stay at 300 mL, but the pressure, temperature, and amount can change" is not true regarding the remainder of the experiment if the scientist wants to use the combined gas law. The combined gas law allows for changes in all four variables: pressure, volume, temperature, and amount of gas.

C. The statement "The temperature must stay at 900 K, but the pressure, temperature, and amount can change" is not true regarding the remainder of the experiment if the scientist wants to use the combined gas law. The combined gas law considers variations in temperature along with other variables.

D. The statement "The amount must stay at 0.008 mol CO₂, but the temperature, pressure, and volume can change" is not true regarding the remainder of the experiment if the scientist wants to use the combined gas law. The combined gas law takes into account changes in all four variables, including the amount of gas.

In summary, only statement A is true regarding the remainder of the experiment if the scientist wants to use the combined gas law.

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Complete question :

Which of the following statements are true regarding the remainder of the experiment if the scientist wants to use the combined gas law to calculate different properties?

A. The pressure must stay at 200 kPa, but the volume, temperature, and amount can change.

B. The volume must stay at 300 mL, but the pressure, temperature, and amount can change.

C. The temperature must stay at 900 K, but the pressure, temperature, and amount can change.

D. The amount must stay at 0.008 mol CO2, but the temperature, pressure. and volume can change. are filled with comcsodiocodec

For the reaction 2H2S(g) ⇌ 2H2(g) + S2(g), the effect of a volume change on this reaction at equilibrium can be considered. It can be predicted whether increasing the reaction volume will cause the reaction to shift to the right, shift to the left, or have no effect on the reaction.

In this reaction, two moles of gaseous reactants are being converted into two moles of gaseous products. Therefore, this is a reaction that involves a change in volume. According to Le Chatelier's principle, the equilibrium will shift in such a way as to counteract the effect of the volume change.

If the reaction volume is increased by adding inert gas (i.e., a gas that doesn't react with the reactants), then the total pressure of the system will increase, but the partial pressures of the reactants and products will remain the same. Since the partial pressures remain unchanged, the equilibrium will not shift in either direction.

However, if the reaction volume is decreased by removing some of the gaseous products, then the partial pressure of the products will decrease. In order to counteract this decrease, the equilibrium will shift to the right to produce more gaseous products (i.e., more H2 and S2). Therefore, decreasing the volume will cause the reaction to shift to the right.

Therefore, increasing the reaction volume will have no effect on this reaction at equilibrium.

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Answer:

Hi

Explanation:

Decomposition reactions are really the opposite of combination reactions. In decomposition reactions, a single compound breaks down into two or more simpler substances (elements and/or compounds).

Explanation:

Decomposition chemical reactions

Decomposition reactions are really the opposite of combination reactions. In decomposition reactions, a single compound breaks down into two or more simpler substances (elements and/or compounds).

The decomposition of water into hydrogen and oxygen gases

and the decomposition of hydrogen peroxide t form oxygen gas and water

are examples of decomposition reactions.

Answer:chain reaction

Explanation:

The concentration of OH- for a 0.0545 M solution of hydrochloric acid (HCl) is 7.21 x 10^-13 M.

Let's first understand the concepts of acids and bases and strong acids and bases.

Acids are proton donors, and bases are proton acceptors. The strength of an acid or a base is determined by the extent to which it donates or accepts protons. Strong acids and bases dissociate completely in water, while weak acids and bases dissociate only partially.

Thus, a strong acid or base has a high concentration of H+ or OH-, respectively.
Now let's solve the problem. We are given a 0.0545 M solution of hydrochloric acid (HCl).

Since HCl is a strong acid, it dissociates completely in water according to the equation:

HCl → H+ + Cl-

The concentration of H+ in the solution will be equal to the concentration of HCl, which is 0.0545 M.
Since we know that

pOH + pH = 14,

we can calculate the pOH of the solution using the pH:

pH = -log[H+]

pH = -log(0.0545)

pH = 1.2648
Now,

pOH + pH = 14

can be rewritten as:

pOH = 14 - pH

pOH = 14 - 1.2648

pOH = 12.7352
The concentration of OH- can be calculated using the pOH:

pOH = -log[OH-]

12.7352 = -log[OH-]

[OH-] = 7.21 x 10^-13
Therefore, the concentration of OH- for a 0.0545 M solution of hydrochloric acid (HCl) is 7.21 x 10^-13 M.

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Answer:

I only

last answer

Explanation:

In 0.750 moles of aluminum oxide (Al2O3), there are 2.25 moles of O2- ions. This is determined by the balanced chemical equation for the formation of aluminum oxide, which states that for every 1 mole of Al2O3, there are 3 moles of O2- ions.

By using a simple mole-to-mole conversion, we can calculate the number of moles of O2- ions present. Thus, with 0.750 moles of Al2O3, multiplying by the ratio of 3 moles O2- ions to 1 mole Al2O3 yields 2.25 moles of O2- ions. To determine the number of moles of O2- ions in 0.750 moles of aluminum oxide (Al2O3), we need to consider the balanced chemical equation for the formation of aluminum oxide. The formula for aluminum oxide indicates that for every 1 mole of Al2O3, there are 3 moles of O2- ions. Therefore, if we have 0.750 moles of Al2O3, we can calculate the number of moles of O2- ions as follows:

0.750 moles Al2O3 × (3 moles O2- ions / 1 mole Al2O3) = 2.25 moles O2- ions

Therefore, there are 2.25 moles of O2- ions in 0.750 moles of aluminum oxide, Al2O3.

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Answer:

24,000 years

Explanation:

Answer:

Explanation:

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

force = mass × acceleration

From the question we have

net force = 2400 × 3.6

We have the final answer as

Hope this helps you

The minimum number of atoms that could be contained in the unit cell of an element with a body-centered cubic (BCC) lattice is 2 atoms.

In a body-centered cubic lattice, each corner of the cube is occupied by one atom, and there is an additional atom at the center of the cube. This arrangement gives rise to a total of 2 atoms per unit cell.

The corner atoms are shared between adjacent unit cells, contributing 1/8th of an atom to each cell, while the atom at the center is fully contained within the unit cell.

Therefore, the minimum number of atoms in the unit cell of a BCC lattice is 2.

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Answer:

The new volume will be 8.2 x 10⁻³ L or 0.0082 L.

Explanation:

Since our temperature remains constant, apply Boyle's Law:

P₁V₁ = P₂V₂

Plug in the initial pressure and volume on the left side, and the new pressure on the right:

9.9(1.033) = 1245(V₂)

V₂ = (9.9(1.033)) / 1245

V₂ = 8.2 x 10⁻³ L or 0.0082 L

a) The Cation Exchange Capacity, CEC, of the soil is 16 cmolc.

b) The aluminum saturation of the soil is approximately 18.75%.

(a) The CEC (Cation Exchange Capacity) of the soil is calculated from the sum of the exchangeable cations present in the soil.

CEC = Ca²⁺ + Mg²⁺ + K⁺ + Al³⁺

CEC = 9 cmolc + 3 cmolc + 1 cmolc + 3 cmolc

CEC = 16 cmolc

(b) To calculate the aluminum saturation of the soil, we need to determine the percentage of the CEC occupied by Al³⁺ ions.

Aluminum Saturation = (Al³⁺ / CEC) * 100

Aluminum Saturation = (3 cmolc / 16 cmolc) * 100

Aluminum Saturation ≈ 18.75%

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The mass (mm) of glucose in 195 mL of a 5.50% (m/v) glucose solution is 10.725 grams (g).

The mass (mm) of glucose in 195 mL of a 5.50% (m/v) glucose solution is 10.725 grams (g).Explanation:The formula used to calculate the mass (mm) of glucose in 195 mL of a 5.50% (m/v) glucose solution is given as follows:Firstly, we need to know the formula of the percentage by mass/volume:%(m/v) = (mass of solute / volume of solution) × 100where,(mass of solute / volume of solution) is the concentration of the solution (C) and can be represented as:C = (mass of solute / volume of solution)Now, using the above formula we can find out the mass (mm) of glucose in 195 mL of a 5.50% (m/v) glucose solution:Given,Volume of solution (V) = 195 mLConcentration of solution (C) = 5.50% (m/v)The concentration of solution (C) is 5.50% (m/v)So, it means in 100 mL of the glucose solution, 5.50 g of glucose is present. Hence, in 195 mL of glucose solution, the mass of glucose is given as:Mass of glucose = (mass/volume) × volumeMass of glucose = (5.50 g/100 mL) × 195 mL= 0.055 g/mL × 195 mL= 10.725 gTherefore, the mass (mm) of glucose in 195 mL of a 5.50% (m/v) glucose solution is 10.725 grams (g).

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The addition of 0.183 moles of hydrobromic acid to a 1 liter solution containing 0.487 M acetic acid and 0.365 M sodium acetate will lower the pH slightly. On the other hand, the addition of 0.391 moles of nitric acid to a 1 liter solution containing 0.474 M hydrocyanic acid and 0.356 M potassium cyanide will lower the pH by several units.

In the first case, the acetic acid and sodium acetate form a buffer solution, which helps maintain a relatively stable pH. The acetic acid acts as a weak acid, while the sodium acetate is its conjugate base. When a small amount of hydrobromic acid is added, it reacts with the acetate ions in the buffer system, shifting the equilibrium towards the formation of more acetic acid and water. This results in an increase in the concentration of hydronium ions (H3O+), leading to a slight decrease in pH.

In the second case, the hydrocyanic acid and potassium cyanide also form a buffer solution. However, nitric acid is a strong acid that completely ionizes in water. The addition of nitric acid increases the concentration of hydronium ions significantly, overpowering the buffer system and causing a substantial decrease in pH.

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Answer:

Because both the bonding electrons come from the oxygen atom. Explanation: A coordinate covalent bond is formed when both the bonding electrons are coming from the same atom

Explanation:

Answer:

The first one is correct.

Explanation: Eh Are you cheating on quiz?

Diffusion is the process by which particles (such as molecules, ions, or atoms) move from an area of higher concentration to an area of lower concentration, driven by the concentration gradient.

A concentration gradient refers to the difference in concentration between two regions. In diffusion, particles move randomly and collide with each other, causing them to spread out and distribute themselves evenly.

As particles move from higher concentration to lower concentration, the concentration gradient decreases, resulting in the equalization of concentrations over time. This movement occurs due to the natural tendency of particles to achieve a state of equilibrium, where there is no net movement of particles across the concentration gradient.

Diffusion plays a crucial role in various biological, physical, and chemical processes, such as gas exchange in the lungs, the transport of nutrients across cell membranes, and the mixing of substances in solutions.

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Answer:

carbon dioxide and oxygen

Explanation:

Answer:

This process produces methane and hydrogen

Explanation:

The amphiprotic substances among the options provided are HS⁻ and NH₃.

The term "amphiprotic" refers to substances that can act as both acids and bases, depending on the reaction conditions.

a. H₂SO₄ (sulfuric acid) is not considered amphiprotic. It is a strong acid that readily donates a proton (H+) but does not accept protons in typical acid-base reactions.

b. HS⁻ (hydrogen sulfide ion) is amphiprotic. It can act as a base by accepting a proton to form H₂S (hydrogen sulfide), and it can also act as an acid by donating a proton to form S²⁻ (sulfide ion).

c. PO₄³⁻ (phosphate ion) is not considered amphiprotic. It is a polyprotic base that can donate multiple protons, but it does not accept protons in typical acid-base reactions.

d. NH₃ (ammonia) is amphiprotic. It acts as a base by accepting a proton to form NH₄⁺ (ammonium ion), and it can also act as an acid by donating a proton to form NH₂⁻ (amide ion).

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Compound A is likely a compound containing a central carbon atom bonded to two methyl groups, followed by a carbon chain of three carbons ending with a carbonyl group.

Based on the given reaction of oxidative cleavage with KMnO₄ in an acidic solution, the products formed are:

Compound A → (CH₃)₂C=O + CH₃CH₂CH₂CO₂H

From this, we can deduce that Compound A must be a compound that, upon oxidative cleavage, yields acetone [(CH₃)₂C=O] and a carboxylic acid (CH₃CH₂CH₂CO₂H).

To propose a structure for Compound A, we need to consider the functional groups and the products formed.

1. Acetone (CH₃)₂C=O: This is a ketone functional group, consisting of a carbon double-bonded to an oxygen atom, with two methyl groups attached to the same carbon atom.

2. Carboxylic acid (CH₃CH₂CH₂CO₂H): This is a carboxylic acid functional group, consisting of a carbon double-bonded to an oxygen atom (carbonyl group) and a hydroxyl group (-OH) attached to the same carbon atom. The carbon atom is further bonded to an ethyl group (CH₂CH₂) and a hydrogen atom (H).

Based on these products, a possible structure for Compound A is:

In this structure, the central carbon atom is bonded to two methyl groups (CH₃) and is connected to an ethyl group (CH₂CH₂) and a carboxylic acid group (COOH).

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The critical angle is given by sin ic = n2 / n1, where n1 and n2 are the indices of refraction for the media.

Using the formula sin ic = n2 / n1 for the critical angle for a liquid-air surface, we can calculate the index of refraction of the liquid.47.7° = sin⁡ic = n2 / n1, where n1 is the index of refraction of air, which is 1.00. The index of refraction of the liquid is therefore 1.33.

When light travels from a medium with a high refractive index (n1) to a medium with a low refractive index (n2), total internal reflection occurs if the angle of incidence is greater than the critical angle (ic).

The critical angle (ic) can be calculated using the formula sin ic = n2 / n1, where n1 and n2 are the indices of refraction of the media. The angle of incidence that causes total internal reflection is the critical angle.

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Answer:

9.05 g

Explanation:

PV=nRT

Use the ideal gas equation. Substitute values.

P = 5 atm

V = 1.50 L

n = ?

R (gas constant) = 0.08206 L-atm/mol-K

T = 20.0°C

*Always convert °C to K.

T = 20.0° + 273 = 293K

Substitute values.

(5 atm)(1.50 L) = n(0.08206 L-atm/mol-K)(293K)

n = (5 atm)(1.50 L) / (0.08206 L-atm/mol-K)(293K)

n = 0.3119335... mol

Convert to grams with the given average mass of air.

0.3119335... mol x (29.0 g/1 mol) = 9.05 g

Change in entropy of the system ΔSsys would be positive, negative, negative, negative respectively.

The term "ΔSsys" refers to the change in entropy of the system. The entropy change of a system is determined by considering the system's state before and after the reaction occurred. Here are the sign of ΔSsys for each of the given chemical reactions:

a) 2H3O+ (aq) + CO32- (aq) → CO2 (g) + 3H2O (l)

The reaction involves the formation of one gas molecule and three liquid molecules from two aqueous solutions. Because gas molecules have a higher entropy than liquids, the entropy of the system would rise if the reaction were to take place. Therefore, ΔSsys would be positive.

b) CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l)

The reaction involves the formation of one gas molecule and two liquid molecules from two gas molecules. The entropy of the system would therefore decrease. Therefore, ΔSsys would be negative.

c) PCl3 (l) + Cl2 (g) → PCl5 (s)The reaction involves the formation of a solid product from a liquid and a gas. Because solids have lower entropy than liquids or gases, the entropy of the system would decrease. Therefore, ΔSsys would be negative.

d) SO3 (g) + H2O (l) → H2SO4 (l)The reaction involves the formation of a liquid from two gases. The entropy of the system would therefore decrease. Therefore, ΔSsys would be negative.

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