What is the molality of a solution containing 30.0 g of napthalalene (C10H8) dissolved in 500.0 g of toulene? Please provide work. Thanks in advance!

If some amount of Aga is adsorbed onto the Teflon surface, this means that the total amount of Aga in the system is not just the amount that is detected on the electrode surface, but also includes the amount that is adsorbed onto the Teflon surface.

Since the green fluorescence intensity from the entire Teflon area is only 5% of what is measured from the electrode area, we can assume that only a small fraction of the Aga is adsorbed onto the Teflon surface, and that the majority of the Aga is still on the electrode surface.

To modify the result, we need to take into account the additional amount of Aga that is adsorbed onto the Teflon surface. We could measure the amount of Aga adsorbed onto the Teflon surface separately and then add it to the amount detected on the electrode surface to obtain the total amount of Aga in the system.

Alternatively, we could assume that the amount of Aga adsorbed onto the Teflon surface is proportional to the total Teflon surface area, and estimate the amount of Aga adsorbed onto the Teflon surface based on the ratio of the Teflon surface area to the electrode surface area.

We would then add this estimated amount of Aga to the amount detected on the electrode surface to obtain an estimate of the total amount of Aga in the system.

Either way, taking into account the amount of Aga adsorbed onto the Teflon surface would modify the result by increasing the total amount of Aga in the system.

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0.015924 grams of CaO should be dissolved in sufficient water to make 1.00 L of a solution with pH of 10.50

The pH scale determines how acidic or basic water is. The range is 0 to 14, with 7 representing neutrality. Acidity is indicated by pH values below 7, whereas baseness is shown by pH values above 7.

The pH is 10.6, the pH is 14, and the pH is 3.4.

Thus, the issue. of OH- is 10 (-3.4) This represents the quantity of CaO needed in a 1L solution. Once you have the moles, you can calculate the solution by multiplying it by the molar mass of CaO (40 gm/mol).

The result of the computation is 0.015924 gms.

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The equivalent of 2.05 moles of Fe can be created from 4.1 moles of CO.

The balanced chemical equation for the reaction between CO (carbon monoxide) and Fe₂O₃ (iron(III) oxide) is:

3CO + Fe₂O₃ → 2Fe + 3CO₂

From the equation, we can see that 3 moles of CO reacts with 1 mole of Fe₂O₃ to produce 2 moles of Fe. Therefore, we can set up a proportion:

3 moles of CO / 1 mole of Fe₂O₃ = 2 moles of Fe / 1 mole of Fe₂O₃

Simplifying the proportion, we get:

3 moles of CO = 2 moles of Fe

Now, we can use this proportion to calculate the number of moles of Fe that can be formed from 4.1 moles of CO:

2 moles of Fe = (3 moles of CO / 1 mole of Fe₂O₃) x 4.1 moles of CO

2 moles of Fe = 12.3 moles of CO / mole of Fe₂O₃

Therefore, the number of moles of Fe that can be formed from 4.1 moles of CO is: 2.05 moles of Fe

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The balanced equation is: Br2(l) + 6 OH-(aq) → 2 BrO3-(aq) + 3 H2O(l), with Br2 as the oxidizing agent and OH- as the reducing agent.

The balanced equation for the given skeleton reaction is:

Br2(l) + 6 OH-(aq) → 2 BrO3-(aq) + 3 H2O(l)

In this balanced equation:

- The oxidizing agent is Br2 (liquid bromine) because it is reduced from an oxidation state of 0 to -1 in BrO3-.

- The reducing agent is OH- (hydroxide ion) because it is oxidized from an oxidation state of -1 to 0 in H2O.

The states of the reactants and products have been included in the balanced equation.

Br2(l) represents liquid bromine, OH-(aq) represents aqueous hydroxide ions, BrO3-(aq) represents aqueous bromate ions, and H2O(l) represents liquid water.

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Answer: Zelda should place one container of water in sunlight (by a window or outdoors) and the other container in a dark room (closet) away from the sun.

Explanation: This would allow Zelda to test two different settings (sun and no sun) so she can test her hypothesis.

If we have solution with Ethanol as solvent and Water as solute, it is expected that water will not be dissolved in ethanol, because of the polarity, since water is polar and ethanol is only a little bit polar, they don't mix, which means that water will not be dissolved in ethanol

Answer:

You can use a PH tester do identify the PH of each solution.  Depending on what solutions ur testing, u shouldn't mix them as for there could be either a minor or bad chemical reaction

Explanation:

Answer:

change

before

after

Explanation:

have a nice day :)

Answer: Malleability

Explanation: Is because metals have mobile electrons in their s orbitals.

Hope this helps..

Answer:

The answer to this question is mobile electrons in s orbitals.

The answer to the following question on edg is directional electrons in p orbitals.

Explanation:

According to the hypothesis of ionization when Swedish scientist Svante Arrhenius, also known as Arrhenius recommended the notion of bases and acids in 1884.

The Arrhenius was theory of base and acid formation was developed by The young man August Arrhenius the (1959–1927), whom drew on the findings and research of the people who went after him. in this theory, bases are things that "deliver hydroxy the anions to the solution," while acids are things that "deliver hydrogen anions to the solution."

The Brnsted-Lowry Acid and Base Hypothesis Because they combine with the hydrogen ions of acid to generate water, oxidizing ions are still considered bases. An acid reacts with the liquid molecules by giving it a proton, which allows liquid water molecule to generate ionized hydrogen in solution.

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The renal threshold for a substance is reached when the filtered load equals the transport maximum. This corresponds to option (a).

The renal threshold refers to the plasma concentration of a substance at which it starts to appear in the urine. When the filtered load of a substance exceeds the transport maximum (Tm) of the renal tubules, the excess amount cannot be reabsorbed and is excreted in the urine.

Therefore, the renal threshold is reached when the filtered load of a substance reaches its transport maximum, and any additional amount beyond that threshold will be excreted. This mechanism helps maintain the homeostasis of substances in the body by regulating their reabsorption and excretion in the kidneys.

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Here are the 3 mole conversion factors you requested:

1 mol = 22.4 L at STP (standard temperature and pressure)

1 mol = molar mass (in grams)

1 mol of any gas at STP = 6.02 x 10²³ molecules

Percent composition:

a. H₂S

The molar mass of H₂S is 2(1.008) + 32.06 = 34.076 g/mol

The percent composition of hydrogen in H₂S is (2 x 1.008 g/mol) / 34.076 g/mol x 100% = 5.93%

The percent composition of sulfur in H₂S is (32.06 g/mol) / 34.076 g/mol x 100% = 94.07%

b. (NH₄)₂C₂O₄

The molar mass of (NH₄)₂C₂O₄ is 2(18.038) + 2(12.011) + 4(15.999) + 8(1.008) = 124.096 g/mol

The percent composition of nitrogen in (NH₄)₂C₂O₄ is (2 x 14.007 g/mol) / 124.096 g/mol x 100% = 22.60%

The percent composition of carbon in (NH₄)₂C₂O₄ is (2 x 12.011 g/mol) / 124.096 g/mol x 100% = 19.44%

The percent composition of oxygen in (NH₄)₂C₂O₄ is (4 x 15.999 g/mol) / 124.096 g/mol x 100% = 51.60%

The percent composition of hydrogen in (NH₄)₂C₂O₄ is (8 x 1.008 g/mol) / 124.096 g/mol x 100% = 6.37%

c. Mg(OH)₂

The molar mass of Mg(OH)₂ is 24.305 + 2(15.999 + 2(1.008)) = 58.319 g/mol

The percent composition of magnesium in Mg(OH)₂ is (24.305 g/mol) / 58.319 g/mol x 100% = 41.67%

The percent composition of oxygen in Mg(OH)₂ is (2 x 15.999 g/mol) / 58.319 g/mol x 100% = 54.94%

The percent composition of hydrogen in Mg(OH)₂ is (4 x 1.008 g/mol) / 58.319 g/mol x 100% = 3.39%

Grams of elements:

2. a. To find the number of grams of sulfur in 7.23 g H₂S:

First, calculate the molar mass of H₂S: 2(1.008) + 32.06 = 34.076 g/mol

Next, use the percent composition of sulfur in H₂S (94.07%) to calculate the mass of sulfur in 7.23 g H₂S:

(94.07 g S / 100 g H₂S) x 7.23 g H₂S = 6.80 g S

b. The molar mass of (NH₄)₂C₂O₄ is 2(18.038) + 2(12.011) + 4(15.999) + 8(1.008) = 124.096 g/mol. The percent composition of nitrogen in (NH₄)₂C₂O₄ is 22.60%. To find the number of grams of nitrogen in 24.0 g (NH₄)₂C₂O₄, we can use the percent composition:

24.0 g (NH₄)₂C₂O₄ x (0.2260 nitrogen / 1.0000 (NH₄)₂C₂O₄) = 5.42 g nitrogen

Therefore, there are 5.42 grams of nitrogen in 24.0 g (NH₄)₂C₂O₄.

c. The molar mass of Mg(OH)₂ is 24.305 + 2(15.999 + 2(1.008)) = 58.319 g/mol. The percent composition of magnesium in Mg(OH)₂ is 41.67%. To find the number of grams of magnesium in 94.2 g Mg(OH)₂, we can use the percent composition:

94.2 g Mg(OH)₂ x (0.4167 magnesium / 1.0000 Mg(OH)₂) = 39.25 g magnesium

Therefore, there are 39.25 grams of magnesium in 94.2 g Mg(OH)₂.

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Answer:

base

Explanation:

The substance NaOH will be disassociated in ions of Na and OH.

Ahrrenius concept of base it's anything that dissolved in water produces OH.

The balance and net ionic equation are;

1. Ca (s) + Br2 (l) → CaBr2 (s)

2. HNO3 (aq) + BaCl2 (aq) → Ba(NO3)2 (aq) + 2HCl (aq)

3. C7H16 (l) + 11O2 (g) → 7CO2 (g) + 8H2O (l)

4. balanced equation:Cl2 (g) + 2KI (aq) → 2KCl (aq) + I2 (s),

Net ionic equation:

Cl2 (g) + 2I- (aq) → 2Cl- (aq) + I2 (s)

5. Zn (s) + Ca(NO3)2 (aq) → No reaction (since Ca is less reactive than Zn)

6. 2Na3PO4 (aq) + 3Mg(NO3)2 (aq) → Mg3(PO4)2 (s) + 6NaNO3 (aq)

Net ionic equation: 2PO4^3- (aq) + 3Mg^2+ (aq) → Mg3(PO4)2 (s)

7. 2Al (s) + 3ZnCl2 (aq) → 2AlCl3 (aq) + 3Zn (s)

8. 2Fe2O3 (s) → 4Fe (s) + 3O2 (g)

9. Balanced equation: LiOH (aq) + HCl (aq) → LiCl (aq) + H2O (l)

Net ionic equation: OH- (aq) + H+ (aq) → H2O (l)

10A. Solid sodium in water.

2Na (s) + 2H2O (l) → 2NaOH (aq) + H2 (g)

10B. What would happen if you bring a burning splint to the previous reaction?

10 C - The burning splint would go out (since the H2 produced in the reaction may ignite and cause a "pop" sound, but the burning splint itself would go out).

A balanced equation is a chemical equation with equal numbers of atoms for each element on both sides, following the law of conservation of mass.

A net ionic equation is a simplified version of a balanced equation that only shows species participating in the reaction as ions, excluding spectator ions that remain unchanged throughout the reaction. This highlights the actual chemical changes occurring in the reaction.

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Answer:

0.03262841

I tried, hope this helps :)

Answer:

0.032 lbs

Explanation:

Divide the mass value by 454.

Approximately 72.48 grams of oxygen are needed to combust 20.0 grams of propane.To determine the amount of oxygen required to combust 20.0 grams of propane (C3H8), we need to use the stoichiometry of the balanced equation.

The balanced equation tells us that 1 mole of propane (C3H8) reacts with 5 moles of oxygen (O2) to produce 3 moles of carbon dioxide (CO2) and 4 moles of water (H2O).

First, we need to calculate the number of moles of propane in 20.0 grams. The molar mass of propane (C3H8) is 44.1 grams/mol (3 carbon atoms + 8 hydrogen atoms).

Moles of propane = mass / molar mass

Moles of propane = 20.0 g / 44.1 g/mol ≈ 0.453 mol

According to the stoichiometry of the balanced equation, 1 mole of propane requires 5 moles of oxygen.

Moles of oxygen = 5 * moles of propane

Moles of oxygen = 5 * 0.453 mol = 2.265 mol

Finally, we can calculate the mass of oxygen needed using its molar mass, which is 32.0 grams/mol.

Mass of oxygen = moles of oxygen * molar mass

Mass of oxygen = 2.265 mol * 32.0 g/mol ≈ 72.48 g

Therefore, approximately 72.48 grams of oxygen are needed to combust 20.0 grams of propane.

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Answer:

P2 = 2.25 atm

Explanation:

Given:

V1 = 1.5 L. V2 = 2.0 L

P1 = 3.0 atm. P2 = ?

Use Boyle's law and solve for P2:

P1V1 = P2V2

or

P2 = (V1/V2)P1

= (1.5 L/2.0L)(3.0 atm)

= 2.25 atm

MAYANA is also known as Coleus Scutellarioides is an annual plant that has hairs on both sides of the leaf. THORNS are a specialized plant structure used as a defence mechanism in plants.

These are specialized structures in plants that have evolved to protect the plants from being eaten by predators.

They exist in some citrus plants such as orange and in plants such as the Calamansi and the Bougainvillea plants.

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The volume of dry hydrogen gas at standard atmospheric pressure (which is typically defined as 1 atm or 101.325 kPa) depends on the number of moles of hydrogen gas present. The ideal gas law, PV = nRT, relates the pressure (P), volume (V), number of moles (n), and temperature (T) of an ideal gas. Assuming standard temperature and pressure (0°C and 1 atm), one mole of any ideal gas occupies a volume of 22.4 L. Therefore, to find the volume of dry hydrogen gas at standard atmospheric pressure, we need to know how many moles of hydrogen gas we have.

For example, if we have 1 mole of dry hydrogen gas at standard atmospheric pressure, the volume would be 22.4 L. If we have 0.5 moles of dry hydrogen gas, the volume would be 11.2 L. And so on.

The addition of sodium hydroxide and NaC₂H₃O₂ to water produces a buffer solution. Option a is correct.

A buffer solution is a solution that resists changes in pH when small amounts of an acid or a base are added to it. It contains a weak acid and its conjugate base (or a weak base and its conjugate acid) in approximately equal concentrations.

When sodium hydroxide (NaOH) is added to water, it dissociates completely to form hydroxide ions (OH⁻) and sodium ions (Na⁺):

NaOH → Na⁺ + OH⁻

When sodium acetate (NaC₂H₃O₂) is added to water, it also dissociates, but only partially, to form acetate ions (C₂H₃O₂⁻) and sodium ions (Na⁺):

NaC₂H₃O₂ → Na⁺ + C₂H₃O₂⁻

The acetate ion acts as a weak base and can react with the hydroxide ion to form water and acetate hydroxide:

C₂H₃O₂⁻ + OH⁻ → HC₂H₃O₂ + H₂O

The weak acid, HC₂H₃O₂, formed by this reaction, can react with additional hydroxide ion to reform acetate ion and water:

HC₂H₃O₂ + OH⁻ → C₂H₃O₂⁻ + H₂O

Thus, the solution contains both the weak acid (HC₂H₃O₂) and its conjugate base (C₂H₃O₂⁻), which together act as a buffer and help to resist changes in pH when small amounts of an acid or a base are added to the solution. Option a is correct.

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Answer:

total displacement \time

Explanation:

Answer: By mass, about 96 percent of our bodies are made of four key elements: oxygen (65 percent), carbon (18.5 percent), hydrogen (9.5 percent) and nitrogen (3.3 percent). These elements do not give color to fireworks, but they are found in our body’s most abundant and important molecules, including water, proteins and DNA. The answer is B.

Explanation: I hope this helps. I got it from search.

120 KJ of heat is absorbed in this reaction.

As we know

Where W is the provided mass of carbon, which is 30g, n=W/M

M is the carbon molar mass. 30 / 12 = 2.5 moles at 12g/mol.

As a result, the heat absorbed by 2.5 moles of carbon is equal to 120 kJ, or half the heat absorbed by 5 moles of carbon, or 239.9 kJ.

The heat evolved (either emitted or absorbed) during a process that runs at constant pressure is equivalent to the change in enthalpy. The internal energy (U) and pressure-volume product (PV), are both supplied by the equation:

H=U+PV

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Answer:

you did not show me the options so i'm just going to say a few.

Explanation:

global warming

releases carbon dioxide into the air

other harmful chemicals

takes up a lot of space and time

Answer:

9

Explanation:

The structure of fluorophore used in the experiments has been drawn in the attachment. And from the drawing counting we can say that there are 9 sp2-hybridized carbon atoms present. Fiuorophores are a fluorescent chemical compound that can re-emit light upon light excitation. Normally used to produce absorbance and emission spectra.

Answer:

6.31x10^-10

Explanation:

Answer: 6.31 x 10^-10

Explanation: