HELP
The question is in the picture, I will give 5 stars!

Answer:The equilibrium constant (kc) for the reaction 2HCl(g) =H2(g)+Cl2 (g) is 4×10^-34 at 25°C.

Explanation:

Buffers are the solution that resists the change in pH. 1.39 ml of 5.90 M sodium hydroxide must be added to raise the pH to 5.75.

Henderson–Hasselbalch equation is used to determine the pH of the buffer by the equilibrium concentration of the acid and the conjugate base.

Moles of acetic acid are calculated as:

[tex]0.480 \times 0.0215 = 0.01032[/tex]

Moles of sodium acetate are calculated as:

[tex]0.480 \times 0.0275 = 0.0132[/tex]

The total number of moles is = 0.02352

Now, using the Henderson–Hasselbalch equation:

[tex]\rm pH = \rm pKa + log \dfrac{[Acetate]}{[Acetic\; acid]}[/tex]

Given,

pH = 5.75

pKa = 4.74

Substituting values in the above equation:

[tex]\begin{aligned} 5.75 &= 4.74 +\rm log \rm \dfrac{[Acetate]}{[Acetic\; acid]}\\\\10.2329 &= \rm \dfrac{[Acetate]}{[Acetic\; acid]}\end{aligned}[/tex]

Solving further:

[tex]\begin{aligned} 10.2329 &= 0.02352 - \rm \dfrac{[Acetic\; acid]}{[Acetic\; acid]}\\\\11.2329\; \rm [Acetic \; acid] &= 0.02352 \\\\&= 0.002093\end{aligned}[/tex]

Moles of acetate is calculated as:

0.02352 moles - 0.002093 moles = 0.021427 moles

Initial moles of acetate were 0.0132, added moles of acetate by the addition of the sodium hydroxide resulted in, 0.021427  - 0.0132 = 0.00822 moles of sodium hydroxide.

Volume is calculated as:

[tex]0.00822 \;\rm moles \times \dfrac{1\;\rm L}{5.90\;\rm M} = 0.00139 L[/tex]

Therefore, 1.39 mL of 5.90M of sodium hydroxide is added.

Learn more about Henderson–Hasselbalch equation here:

https://brainly.com/question/19755735

#SPJ4

Answer:

it's 8

Explanation:

the last group of the periodic table is group 8. so all elements in a group should have the same number of valency electrons

Answer:

943.82 ml

Explanation:

Assuming constant pressure

V1/T1 = V2/T2

T2 * V1/T1 = V2       ( T must be in K units)

(220 + 273.15) * 540 / (273.15 + 9) = 943.8 ml

Answer:

3.12 L

Explanation:

Given the R value that is supplied

      you will need to convert to atm from mm Hg    and C  to K

269 mm / 760 mm/atm = .354 atm

176 c = 449.15

PV = n RT

V = n RT / P    = .03 * .08206 * 449.15  / .354 = 3.12 L

Explanation:

I think the answer is this for a better check mass- mass ratio in stoichiometry lesson

The volume which is occupied by 0.445 mol of carbon dioxide at 397K and 973mmHg is 11.32 L.

Ideal gas equation will be represented as:

PV = nRT, where

P = pressure = 973 mmHg = 1.28 atm

V = volume = ?

n = moles = 0.445 mol

R = universal gas constant = 0.082 L.atm / K.mol

T = temperature = 397 K

On putting all these values, we get moles as:

V = (0.445)(0.082)(397) / (1.28) = 11.317 = 11.32 L

Hence required volume of gas is 11.32 L.

To know more about ideal gas equation, visit the below link:

https://brainly.com/question/555495

#SPJ4

Explanation:

Winter 4

Season when the northern hemisphere is tilted away from the sun.

Summer 2

Season when the northern hemisphere is tilted towards the sun.

Spring 1

Season when the northern hemisphere is neither tilted towards nor away from the sun; days getting longer and warmer.

Fall 3

Season in the northern hemisphere when the Earth is neither tilted towards nor away from the sun; days getting shorter and cooler.

v=293+523

v=816

this is the answer

thank you

Balanced chemical equation for the reaction between sulfuric acid & solid aluminum hydroxide to form liquid water and a soluble salt is 3H₂SO₄ + 2Al(OH)₃  Al₂(SO₄)₃ + 6H₂O.

Balanced chemical equations are those in which all entities are present in same amount on both sides of the chemical equation.

Balanced chemical reaction for the given compounds will be shown as:

3H₂SO₄ + 2Al(OH)₃  Al₂(SO₄)₃ + 6H₂O

Above chemical equation is the balanced equation as all atoms are present in same amount on the left side as well as on the right side of the reaction.

Hence balanced equation is 3H₂SO₄ + 2Al(OH)₃  Al₂(SO₄)₃ + 6H₂O.

To know more about balanced equation, visit the below link:

https://brainly.com/question/26227625

#SPJ4

Answer:

Bubbles indicate change  

Explanation:

i don't know if i'm right but if im not its fine

Hope it helps<3

Answer:

50 kJ

Explanation:

Activation energy is the energy to go from reactants at 150  to   200 kJ

 = 50 kJ

The amount that is Left after 37.2 hr must be less than the original amount of K-42 initially present.

The term radioactivity has to do with the spontaneous disintegration of a substance.

To determine the mass of the K-42 that remains, we must have the half life of the isotope or the decay constant and both information are missing.

However, the amount that is Left after 37.2 hr must be less than the original amount of K-42 initially present.

Learn more about radioactivity:https://brainly.com/question/1770619

#SPJ1

Answer:

Compute the reaction rate to the nearest whole number using the formula below,

mass of tablet/volume of water

Reaction Rate = mas

reaction time

3°C Reaction time = 138.5 sec

Reaction rate = mg/l/sec

24°C Reaction time = 34,2 sec

Reaction rate = mg/L/sec

40°C Reaction time = 26.3 sec

Reaction rate = mg/L/sec

65°C Reaction time = 14.2 sec

Reaction rate = mg/L/sec

Explanation:

I hope my answer help

Answer:

#1 is 36 (138.5 seconds)

#2 is 146 (34.2 seconds)

#3 is 190 (26.3 seconds)

#4 352 (14.2 seconds)

#5 is 145 (34.5 seconds)

#6 is 173 (28.9 seconds)

#7 is 216 (23.1 seconds)

Explanation:

Edge, we may have different orders.

Answer:

The balloon will expand

Explanation:

Steam needs more space than the equivalent wt amount of liquid

Answer:

10.4 moles

Explanation:

    n / 5.2   =   2  M

     n = 10.4  moles

To prepare 0.194 M potassium acetate, add 2.379895 g of potassium acetate to a 125 mL volumetric flask and fill with water to the mark.

Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution.

The following data were obtained from the question:

Molarity of potassium acetate = 0.194 M

Volume of solution = 125 mL

Mass of potassium acetate =?

Next, we shall convert 125 mL to L. This can be obtained as follow:

1000 mL = 1 L

Therefore,

125 mL = 0.125 L

Thus, 125 mL is equivalent to 0.125 L.

Next, we shall determine the number of moles of potassium acetate in the solution. This can be obtained as follow:

Molarity of potassium acetate = 0.194 M

Volume of solution = 0.125 L

Moles of potassium acetate =?

Molarity = [tex]\frac{mole}{Volume}[/tex]

Cross multiply

Mole of potassium acetate = 0.194 M × 0.125

Mole of potassium acetate = 0.02425 mole

Finally, we shall determine the mass of potassium acetate

Molar mass of potassium acetate= 98.14 g/mol

Mass of potassium acetate =?

Mole = [tex]\frac{mass}{Molar mass}[/tex]

Mass of potassium acetate =0.02425  × 98.14

Mass of potassium acetate = 2.379895 g

Thus, to prepare 0.194 M potassium acetate, add 2.379895 g of potassium acetate to a 125 mL volumetric flask and fill with water to the mark.

Learn more about molarity here:

https://brainly.com/question/20713567

#SPJ1

The electronegativity of the element affects the ability of its compounds to dissolve in different solvents.

Electronegativity is a measure of an atom's ability to attract shared electrons to itself.

Polar bonds have a positive and negative side to them, and therefore can attract water dipoles and dissolve in water.

If the polarities of the solvent and solute match (both are polar or both are nonpolar), then the solute will probably dissolve.

If the polarities of the solvent and solute are different (one is polar, one is nonpolar), the solute probably won't dissolve.

Hence, option D is correct.

Learn more about  electronegativity here:

https://brainly.com/question/14560699

#SPJ1

Intermolecular forces are the forces present between the molecules. The London dispersion forces are the strongest interparticle forces present in the ethane.

London dispersion forces are the intermolecular forces are the temporary forces present between the induced dipole formed by the electrons occupied in the atom.

The electrons of the atom are distributed symmetrically and are dispersed just as the light in quanta. In ethane molecule ionic, and hydrogen forces are absent and only LDF and dipole-dipole are present.

Therefore, LDF and dipole-dipole are the intermolecular forces that are present in ethane.

Learn more about intermolecular forces here:

https://brainly.com/question/9875859

#SPJ4

Take the cuttings from the trees and place them around in different enviornements, if the trees grow up to be the expected size in a different eviornement then the the scientists' claim is correct.

I didn't understand at first either, the question is worded a little strangly, but I believe this should answer the question that was asked.

Lewis acid and base are the chemical species that accept and donate pairs of electrons. Boron trifluoride, copper ion, and sulfur dioxide are lewis acids, and iodide ion and water are lewis bases.

Lewis acids are the chemical species that accept the nonbonding electron pair from other chemical species. Hence is an electron-pair acceptor. Boron trifluoride, copper ion, and sulfur dioxide are lewis acids as they can accept an electron to complete an octet.

Lewis bases are the chemical species that donate the non-bonding electron pair to the other chemical species. Hence is an electron-pair donor. Halogen or the iodide and water is a lewis base as it is an electron-rich species.

Therefore, water and iodide is lewis base.

Learn more about lewis acid and lewis base here:

https://brainly.com/question/15570523

#SPJ4

Answer:

battery. you use it for your remotes. vinegar. you use vinegar for cooking of cleaning. nail polish remover. you use this for removing nail polish

In a nuclear fission reaction, a freely moving neutron is introduced to a nuclear fuel, then a neutron is absorbed by an atom's nucleus.

Nuclear fission is a process in which an unstable nuclei will convert into stable nuclei after releasing the energy in the form of particles.

When we introduce a freely moving neutron to the nuclear fuel of uranium-235 nuclei then this introduced neutron was absorbed by the nuclei and makes the nuclei more unstable. Then this unstable nuclei will convert into two nuclei in the addition of three neutrons.

Hence, a neutron is absorbed by an atom's nucleus.

To know more about nuclear fission, visit the below link:

https://brainly.com/question/14019172

#SPJ1

Answer:Seeds are great sources of fiber. They also contain healthy monounsaturated fats, polyunsaturated fats and many important vitamins, minerals and antioxidants. When consumed as part of a healthy diet, seeds can help reduce blood sugar, cholesterol and blood pressure

Explanation:

Answer:

Seeds grow plants wherever they fall is in the right condition and can be used as a sort of food for humans

Explanation:

Answer:

If I understood correctly, your answer should be 0.64 grams

Explanation:

What Renata has granted to the manufacturer of the colored hair dye is called a patent.

A patent is a right given to a manufacturer to be the sole producer of a product for a given period of time. Usually, the patent has to last for a given number of years after which the technology becomes commonplace.

Hence, what Renata has granted to the manufacturer of the colored hair dye is called a patent.

Learn more about patent:https://brainly.com/question/12882864?r

#SPJ1

Answer:

C. Condensation

Explanation:

When molecules release heat energy, it is called exothermic. In this case, condensation would be an example of this.

Answer: it is C condensation

Explanation: I took the quiz

Hope this helps

Hane a nice day

Could you mark me as branly if you could thank you :)