If the pOH of a solution is 13, what is the PH of the solution?

The hydrogen-rich fuel cell offers advantages in terms of efficiency, environmental impact, operating time, refueling speed, weight, size, and lifespan when compared to conventional electrochemical cells like the lead-acid battery.

The hydrogen-rich fuel cell offers several advantages over conventional electrochemical cells like the lead-acid battery. Here are some of the key advantages:

1. Higher Efficiency: Hydrogen fuel cells have higher energy conversion efficiencies compared to lead-acid batteries. Fuel cells can convert chemical energy directly into electrical energy with minimal loss, while lead-acid batteries have inherent energy losses due to factors such as internal resistance and heat dissipation.

2. Clean and Environmentally Friendly: Hydrogen fuel cells produce electricity through the reaction of hydrogen and oxygen, with water being the only byproduct. They do not produce harmful emissions or contribute to air pollution, making them a cleaner and more sustainable power source compared to lead-acid batteries, which require the use of chemicals like sulfuric acid.

3. Longer Operating Time: Fuel cells have longer operating times compared to lead-acid batteries. Lead-acid batteries have a limited capacity and need to be recharged frequently, while fuel cells can continuously generate electricity as long as there is a supply of hydrogen.

4. Faster Refueling: Refueling a fuel cell is faster compared to recharging a lead-acid battery. Fuel cells can be refueled by replenishing the hydrogen supply, which can be done relatively quickly. In contrast, lead-acid batteries require a longer time to recharge, typically hours, depending on the battery's capacity and charging rate.

5. Lighter Weight and Compact Size: Hydrogen fuel cells have a higher energy density compared to lead-acid batteries, meaning they can store more energy in a smaller and lighter package. This makes fuel cells more suitable for applications where weight and space are critical, such as in portable devices or electric vehicles.

6. Longer Lifespan: Fuel cells generally have a longer lifespan compared to lead-acid batteries. Lead-acid batteries can experience degradation over time due to factors like sulfation, which can reduce their overall capacity and lifespan. Fuel cells, on the other hand, can provide consistent performance over an extended period with proper maintenance.

These advantages make fuel cells a promising technology for various applications, including transportation, stationary power generation, and portable electronics.

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The incorrect statement is that; "Aristarchus calculated the distances between the sun and earth fairly accurately."

The solar system is composed of the sun, the planets and other celestial bodies such as the moon. We can see form the experiment that Aristarchus  tried to determine the relative sizes of the earth and the moon.

However, the incorrect statement is that; "Aristarchus calculated the distances between the sun and earth fairly accurately."

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The pH of the buffer solution would be 7.11.

Phosphoric acid, H3PO4, can donate three protons (H+) in a stepwise manner to form dihydrogen phosphate (H2PO4-) and mono hydrogen phosphate (HPO4^2-) ions. The chemical equation for the reaction is as follows:

H3PO4 + H2O ⇌ H2PO4^- + H3O^+

H2PO4^- + H2O ⇌ HPO4^2- + H3O^+

HPO4^2- + H2O ⇌ PO4^3- + H3O^+

The pKa values for these reactions are 2.15, 7.20, and 12.35, respectively.

To prepare a buffer solution, we need to mix a weak acid and its conjugate base or a weak base and its conjugate acid. In this case, we have a mixture of H3PO4 and KH2PO4, which is a weak acid and its conjugate base, respectively.

The Henderson-Hasselbalch equation for a buffer solution is:

pH = pKa + log([base]/[acid])

where [base] and [acid] are the molar concentrations of the conjugate base and weak acid, respectively.

Using the given values:

[acid] = 0.155 mol / 0.500 L = 0.310 M (molarity of H3PO4)

[base] = 0.250 mol / 0.500 L = 0.500 M (molarity of KH2PO4)

We can calculate the pKa value for the first dissociation of H3PO4 using the given Ka value:

Ka = 10^(-pKa) = 7.52 x 10^(-3)

pKa = -log(Ka) = 2.12

Now, substitute the values into the Henderson-Hasselbalch equation:

pH = 2.12 + log(0.500/0.310)

pH = 7.11

Therefore, the pH of the buffer solution is approximately 7.11.

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This problem is providing us with the rate law for the reaction between nitrogen dioxide and carbon monoxide to produce nitrogen monoxide and carbon dioxide. Thus, the required rate constant turns out to be C: 2.08 × 10-4 M-1 s-1 as show below:

In chemistry, chemical kinetics is used to study the changes in the amount of a substance that undergoes consumption or production in a chemical reaction with respect to the time.

In this case, considering the attached picture wherein the data is presented, one can write the following version of the rate law:

\(\frac{d[NO_2]}{dt}=-k[NO_2]^2\)

Which can be integrated by parts:

\(\int{\frac{1}{[NO_2]^2 } } \, d[NO_2]=-k\int{}\, dt\\\\\frac{1}{[NO_2]}=kt\)

Which resembles y=mx+b; this means we need to prepare a 1/[NO₂] vs t graph with a trendline, task that can be done on Excel as shown on the second attached file.

Hence, we see the trendline as y = 0.000208x + 1.977, where the slope, 0.000208, is equal to k (rate constant) and with the appropriate units, it will be:

C: 2.08 × 10-4 M-1 s-1

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\(\\ \tt\hookrightarrow PV=nRT\)

\(\\ \tt\hookrightarrow V=\dfrac{nRT}{P}\)

\(\\ \tt\hookrightarrow V=\dfrac{2(8.314)(300)}{2}\)

\(\\ \tt\hookrightarrow V=8.314(300)\)

\(\\ \tt\hookrightarrow V=2494.2mL\)

\(\\ \tt\hookrightarrow V=24.94dm^3\)

2 moles of a gas have a pressure of 2 atm at a temperature of 300 K then volume will be 24.94 \(dm^{3}\).

The mole would be a SI unit that is used to quantify the quantity of any material. Mol is just the shorthand for "mole."

The force among all gas particle/wall interactions distributed mostly by the surface area of the wall would be the definition of pressure (P). Another of the fundamental quantifiable variables of this stage of matter, pressure, would be a property shared by all gases.

Calculation of volume.

Given data:

Number of moles = 2 mol

pressure = 2 atm

Temperature = 300K

Volume = ?

Volume can be calculated by using the formula:

PV = nRT

where, P is pressure, T is temperature.

Now, put the value of given data in above equation.

V = nRT / P

V = 2 × 8.31× 300/ 2

V = 2494.2ml

V = 24.94 \(dm^{3}\)

Therefore, the volume will be 24.94 \(dm^{3}\)

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The balanced equation is: 4 \(H_2S\)+ 3 \(O_2\)→ 4 \(SO_2\)+ 8 \(H_2O\)

The given chemical equation is unbalanced. To balance it, we need to adjust the coefficients in front of each chemical species until the number of atoms on both sides of the equation is equal.

The unbalanced equation is:

2 \(H_2S\)+ 3 \(O_2\)→ \(SO_2\)

Let's start by balancing the sulfur (S) atoms. We have two sulfur atoms on the left side and one sulfur atom on the right side. To balance the sulfur, we can place a coefficient of 2 in front of the \(SO_2\):

2 \(H_2S\)+ 3 \(O_2\)→ 2 \(SO_2\)

Now, let's balance the hydrogen (H) atoms. We have four hydrogen atoms on the left side (2 from each \(H_2S\)) and none on the right side. To balance the hydrogen, we can place a coefficient of 4 in front of the water (H2O) on the right side:

2 \(H_2S\)+ 3 \(O_2\)→ 2 \(SO_2\)+ 4 \(H_2O\)

Finally, let's balance the oxygen (O) atoms. We have six oxygen atoms on the right side (3 from \(O_2\) and 3 from 2 \(SO_2\)) and three on the left side (2 from \(H_2S\)). To balance the oxygen, we can place a coefficient of 3/2 in front of the O2:

2 \(H_2S\)+ (3/2) \(O_2\)→ 2 \(SO_2\)+ 4 \(H_2O\)

To remove the fractional coefficient, we can multiply all coefficients by 2:

4 \(H_2S\) + 3 \(O_2\)→ 4 \(SO_2\)+ 8 \(H_2O\)

Now the equation is balanced, with an equal number of atoms on both sides. The balanced equation is:

4 \(H_2S\)+ 3 \(O_2\)→ 4 \(SO_2\)+ 8 \(H_2O\)

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The total mass of the balloon and its content is 1521.17 g, the number of moles of CO₂ in the balloon is 34.15 mol, and the number of CO₂ molecules in the balloon is 2.06 x 10²⁵ molecules.

a) The molar mass of CO₂ is 44.01 g/mol. To find the total mass of the balloon and its content, we need to add the mass of the balloon (20g) to the mass of the CO₂ inside the balloon.

Mass of CO₂ = number of moles of CO₂ x molar mass of CO₂

Since the balloon is at STP (standard temperature and pressure), we can use the molar volume of a gas at STP (22.4 L/mol) to find the number of moles of CO₂ in the balloon:

Volume of CO₂ = Volume of balloon = 765 L (at STP)

Number of moles of CO₂ = volume of CO₂ / molar volume of a gas at STP

                                          = 765 L / 22.4 L/mol

                                          = 34.15 mol

Mass of CO₂ = 34.15 mol x 44.01 g/mol

                       = 1501.17 g

Total mass of balloon and its content = 20 g + 1501.17 g

                                                               = 1521.17 g

b) Number of moles of CO₂ in the balloon is 34.15 mol

c) To find the number of CO₂ molecules in the balloon, we need to use Avogadro's number (6.02 x 10²³ molecules/mol).

Number of CO₂ molecules = number of moles of CO₂ x Avogadro's number

                                           = 34.15 mol x 6.02 x 10²³ molecules/mol

                                           = 2.06 x 10²⁵ molecules

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If 60 grams of the substance are added to 100 g of water, the solution can be categorized as supersaturated.

The graph shows the number of grams that can be dissolved in 100 grams of water at different temperatures. In general, solubility increases with temperature.

According to the graph, at a temperature of 30°C, it is possible to dissolve a total of 48 to 49 grams of \(KNO_{3}\). This information implies that if we add 60 grams at this temperature not all the substance would be dissolved, and therefore the solution would be supersaturated.

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Answer:ABOMC5LDECEVCEC

\(Hollow \: bones \: are \: also \: called \\ pneumatized \: bones, \: meaning \: they're \: filled \\ with \: space \: for \: air. \: It \\ is \: thought \: that \: this \: structure \\  helps \: with \: oxygen \: intake \: during \\ flight. \: Air \: sacs \: are \: attached \: to \\ the \: hollow \: areas \: in \: a \: bird's \: bones. ... \\ This \: adds \: more \: oxygen \: to \\ the \: blood, \: providing \: a \\ bird \: with \:extra \:energy \:for\: flight.\)

Answer:

Birds have hollow bones so that they are light for flight  

Explanation:

K12

The time taken for 50% to be decomposed is the half life and this is 14.4 mins.

We know that a first order reaction would have a half life that can be obtained from the formula;

N/No = (1/2)^ t/\(t_{\frac{1}{2} }\)

N = Number of atoms at time t

No = Number of atoms initially present

t = time taken

\(t_{\frac{1}{2} }\) = Half life of the reaction

Thus;

We have that the substance is 90% decomposed so only 10% of the original sample remains.

Now;

0.1No/No = (1/2)^48/\(t_{\frac{1}{2} }\)

0.1 = (0.5)^48/\(t_{\frac{1}{2} }\)

ln (0.1) = 48/\(t_{\frac{1}{2} }\) ln(0.5)

-2.3 = 48/\(t_{\frac{1}{2} }\) (-0.69)

48/\(t_{\frac{1}{2} }\) =-2.3/-0.69

\(t_{\frac{1}{2} }\) = 14.4 min

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Answer:

dangerous woman by ariana grande

Explanation:

Answer:

C6H10O6

Explanation:

Convert % and make them to grams. Convert grams to mols. Use mole ratios to find empirical formula. I will calculate it in a second. Hope this helps for now. This is my quick answer imma check my work one sec.

The sandwich contains approximately 71.25 grams of carbohydrates.

Calories are a unit of measurement used to quantify the amount of energy contained in food and beverages. The number of calories in a particular food is determined by the amounts of carbohydrates, fats, proteins, and other nutrients it contains.

To determine the number of grams of carbohydrates in the sandwich, we need to use the fact that carbohydrates, fats, and proteins have different calorie densities. Specifically, carbohydrates and proteins each contain about 4 calories per gram, while fats contain about 9 calories per gram.

First, let's calculate the total number of calories coming from the fat and protein in the sandwich:

Total calories = calories from carbohydrates + calories from fat + calories from protein

475 Calories = calories from carbohydrates + 10g x 9 Calories/g + 25g x 4 Calories/g

475 Calories = calories from carbohydrates + 90 Calories + 100 Calories

475 Calories - 190 Calories = calories from carbohydrates

285 Calories = calories from carbohydrates

Now that we know the number of calories from carbohydrates, we can use the calorie density of carbohydrates to determine the number of grams of carbohydrates:

285 Calories = carbohydrates in grams x 4 Calories/g

71.25 g = carbohydrates in grams

Therefore, the sandwich contains approximately 71.25 grams of carbohydrates.

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Answer

What happens is that the iron will displace the Cu²⁺ from the copper sulfate solution. The following is the chemical equation for the reaction.

Fe + CuSO₄ → FeSO₄ + Cu

(i) This reactivity series helps us understand this displacement reaction taking place. The reactivity series is a series of metals, in order of reactivity from highest to lowest. It is used to determine the products of single displacement reactions, whereby a metal e.g Fe will replace another metal e.g Cu in a solution if the former is higher in the series than the latter.

Hence, the surface of the iron nail will have a brown coating of copper formed on it, and the color of the copper sulfate solution which was initially blue changes to light green.

The reactivity series is otherwise called the activity series. The figure is the reactivity series of metals.

Answer:

19g

Explanation:

The mass of the steam produced in this phase change process will also be 19g. This is in compliance with the law of conservation of mass.

Answer:

Xavier boiled 14 grams of water. If all of the water changed into a gas, what would be the mass of the steam?

A.

28 g

B.

0 g

C.

24 g

D.

14g

Explanation:

The container will expand to 4.0 L when it holds 2.4 moles of the same gas.

To answer your question, we will use the concept of Avogadro's law, which states that the volume of a gas is directly proportional to the number of moles (n) of the gas when the temperature and pressure remain constant.

Mathematically, it can be represented as:
V1/n1 = V2/n2

where,

V1 and n1 = initial volume and moles of the gas

V2 and n2 = final volume and moles of the gas

Given the initial conditions,

V1 = 3.0 L

n1 = 1.8 moles

The final condition,

n2 = 2.4 moles.

To find V2, Using the given values and rearranging the formula, we have:

V2 = V1 * (n2/n1)

V2 = 3.0 L * (2.4 moles / 1.8 moles)

V2 = 3.0 L * (1.3333)

V2 = 4.0 L

So, when the container holds 2.4 moles of the same gas, it will expand to a volume of 4.0 L. This is because the number of moles of the gas has increased, and according to Avogadro's law, the volume must also increase proportionally to maintain a constant temperature and pressure.

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The question requires us to calculate the number of moles that corresponds to 5.01 x 10^22 atoms of magnesium.

To solve this question, we'll need to use the Avogadro constant. This number, defined as 6.02 x 10^23, relates the number of constituent particles (molecules, atoms or ions, for example) in a sample with the amount of substance in that sample. We can use it by saying that 1 mol of a substance corresponds to 6.02 x 10^23 constituent particles of this substance.

Then, using the information above, we can calculate the number of moles in 5.01 x 10^22 atoms of magnesium (Mg):

6.02 x 10^23 atoms of Mg --------------- 1 mol of Mg

5.01 x 10^22 atoms of Mg ---------------- x

Solving for x, we'll have:

Therefore, 5.01 x 10^22 atoms of magnesium corresponds to 0.0832 mol of this element.

Answer:

HI is the Arrhenius acid

CsOH is the Arrhenius base

Explanation:

Acid-Base reactions are reactions that involve the transfer of protons.

Arrenhius Acids

Arrenhius acids are molecules that have an H⁺ ion. In an acid-base reaction, the acid will donate the H⁺ ion to the base. The molecule HI (called hydroiodic acid) is the acid because it has an H⁺ ion. Note that an H⁺ ion is simply a proton because it has no electrons or protons.

H₂O can also be considered an Arrhenius acid because it does have an H⁺ ion, but it is a very weak acid.

Arrenhius Bases

Arrhenius bases are molecules that have an OH⁻ ion. In an acid-base reaction, the base will accept an H⁺ ion. The molecule CsOH (called cesium hydroxide) is the base because it has an OH⁻ ion. The OH⁻ ion is one of the most common polyatomic ions and is called hydroxide.

H₂O can also be considered an Arrhenius base because it has an OH⁻ ion. However, it is a weak base. Still, water is very important to acid-base reactions because it can be either an acid or a base.

In the reaction HI + CsOH + H2O, HI is the Arrhenius acid and CsOH is the Arrhenius base.

In the given reaction HI + CsOH + H2O, HI is the Arrhenius acid and CsOH is the Arrhenius base. In the Arrhenius theory of acids and bases, an acid is a substance that produces hydrogen ions (H+) in aqueous solution, while a base is a substance that produces hydroxide ions (OH-) in aqueous solution. HI can dissociate in water to produce H+ ions, making it an acid. CsOH can dissociate in water to produce OH- ions, making it a base.

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Answer: max Ag2S 159 g

Explanation:

at wts Ag 107.87, I 126.9, Na 22.99, S 32.065

AgI 234.76, Na2S 87.12, Ag2S 172.0, NaI 149.6

2(mol)AgI + 1(mol)Na2S —> 1(mol)Ag2S + 2(mol)NaI

200g AgI = 200/107.87 mol = 1.85 mol

200g Na2S = 200/87.12 mol = 2.3 mol, so AgI is limiting.

2 mol AgI —> 1 mol Ag2S, so

1.85 mol AgI —> 1.85/2 mol Ag2S

1 mol Ag2S = 172 g

max Ag2S = 172*1.85/2 g = 159g

The wavelength of the wave grew, which may account for the difference between the two waves.

As two waves collide, they cause each other's displacement to change, creating a totally new wave in the process. The amplitude of the final wave at each point is determined by adding the amplitudes of each wave, according to the concept of superposition.

Transverse waves are like those on water, with their surface flowing up and down, and longitudinal waves are like those of sound, consisting of alternating compressions and rarefactions in a medium.

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Answer:

It has no fixed shape and therefore takes the shape of the part of the container in which it is placed

Sedimentation, filtration, and coagulation are the treatments that will help remove contaminants from minerals or from the pipes carrying water from a source.

Sedimentation is a process in which suspended particles settle out of water. It is one of the most basic techniques for removing particles from water. As particles settle, they become trapped in the bottom of a container or settle to the ground in an outdoor setting

Filtration is a method of removing particles from a fluid. It is a physical or chemical separation method that separates solids from fluids (liquids or gases) by adding a medium through which only the fluid can pass.

Coagulation is the process of using chemicals to remove contaminants from water. By creating a chemical reaction, coagulation destabilizes particles and causes them to clump together. This helps to remove the contaminants from the water.

Disinfection is the process of eliminating or destroying pathogens that cause infection. Disinfection eliminates harmful microorganisms by destroying or inactivating them. The disinfectant is a chemical or physical agent that is used to destroy or inactivate harmful microorganisms.

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The mass(in grams) of iron, Fe produced from the 92.5g of iron (ii) oxide, FeO is 71.9 grams

The mass of Fe produced from the 92.5g of iron (ii) oxide, FeO can be obtained as follow:

2FeO → 2Fe + O₂

From the balanced equation above,

143.7 g of FeO reacted to produce 111.7 g of Fe

Therefore,

92.5 g of Fe will react to produce = (92.5 × 111.7) / 143.7 = 71.9 g of Fe

Thus, the mass of Fe produced from the reaction is 71.9 grams

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Complete question:

How many grams of Fe are produced from 92.5 g of FeO given the following reaction 2FeO → 2Fe + O₂

The red line showing the IR spectrum emitted from the earth's surface does not match the blue line showing the expected IR spectrum from a 300˚C object because:

IR spectroscopy studies Infrared (IR) light in the electromagnetic spectrum.

Sensors are used by thermal detection systems, also known as infrared detection systems, to detect radiation in the infrared region of the electromagnetic spectrum.

In order to create an electronic signal, an infrared camera must first detect the thermal energy or heat, that the scene being seen emits. After processing this signal, an image is created.

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Lithium (Li) +1 is correctly matched with its ionic charge.

In general, elements in the first column of the periodic table (known as alkali metals) tend to have a charge of +1 when they form ions. Lithium is the first element in the first column of the periodic table, so it is correctly matched with a charge of +1.

Oxygen (O) is correctly matched with a charge of -2. Oxygen is a non-metal and in most of the compounds it forms, it has a charge of -2.

Potassium (K) +1 is also correctly matched with its ionic charge. Potassium is an alkali metal, which means it tend to have a charge of +1 when it forms ions.

Nitrogen (N) is a nonmetal and it has a charge of -3, when it forms anions like Nitride ions (N₃-). Nitrogen (N) +3 is not a correct match with its ionic charge.

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This atom has a mass number of 195. Hence, there are 78 protons in an atom, which is the atomic number.

Atoms that belong to the same element with the same isotopes Z but a distinct mass number A are known as isotopes. Carbon-12, Carbon-13, while Carbon-14 are three isotopes of the element carbon, each with a mass of 12, 13, and 14.

Atoms that belong to the same element with an identical electron density Z but a distinct mass number A are known as isotopes. For instance, carbon-12, carbon-13, or carbon-14 are three isotopes of the crystal structures, with corresponding weights of 12, 13, and 14.

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Answer:

Fe + CuCl2 = FeCl2 + Cu

Explanation:

This is already balanced.

There are 2.64 × 1022 molecules of sucrose present in this serving of fruit dessert containing 15.0 g of sugar.

To determine the number of molecules of sugar present in the serving, we need to calculate the number of moles of sugar and then convert it to the number of molecules.

Given:

Mass of sugar (sucrose) = 15.0 g

Molar mass of sucrose (C12H22O11) = 342 g/mol

First, calculate the number of moles of sugar using the formula:

Number of moles = Mass of substance / Molar mass

Number of moles of sugar = 15.0 g / 342 g/mol ≈ 0.0439 mol

Next, we use Avogadro's number, which states that there are approximately 6.022 × 10^23 molecules in one mole of a substance. Therefore, to find the number of molecules of sugar:

Number of molecules = Number of moles × Avogadro's number

Number of molecules of sugar = 0.0439 mol × 6.022 × 10^23 molecules/mol ≈ 2.64 × 10^22 molecules

Therefore, there are approximately 2.64 × 10^22 molecules of sugar present in this serving.

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