An aqueous solution has a molality of 3. 64 kcl. what is the the mass percent of kcl in the solution? enter your answer to three significant figures and in units of mass percent

Answer:

Al₂O₃ + 6 NaOH -----> 2 Al(OH)₃ + 3 Na₂O

Explanation:

This is a double-displacement reaction. In these reactions, the cation of one compound is swapped with the cation of another.

It is important that the new products have an overall charge of 0. To do this, some compounds must have more than 1 atom of each ion.

1.) Al(OH)₃

-----> Al³⁺ and OH⁻

-----> +3 + (-1) + (-1) + (-1) = 0

2.) Na₂O

-----> Na⁺ and O²⁻

-----> +1 + 1 + (-2) = 0

An equation is balanced when there is an equal amount of each element on both sides of the reaction. If these values are unequal, you can add coefficients to modify the amounts of particular compounds.

The unbalanced equation:

Al₂O₃ + NaOH -----> Al(OH)₃ + Na₂O

Reactants: 2 aluminum, 4 oxygen, 1 sodium, 1 hydrogen

Products: 1 aluminum, 4 oxygen, 2 sodium, 3 hydrogen

The balanced equation:

Al₂O₃ + 6 NaOH -----> 2 Al(OH)₃ + 3 Na₂O

Reactants: 2 aluminum, 9 oxygen, 6 sodium, 6 hydrogen

Products: 2 aluminum, 9 oxygen, 6 sodium, 6 hydrogen

When the reactants have less enthalpy than the products, then heat energy is given out. That is option A.

An exothermic reaction is a type of reaction in which the energy level of the reactants are higher than that of the product.

It is this discrepancy in the energy levels of both the reactants and products would lead to the generation and release of energy into the surrounding environment.

The enthalpy of exothermic reaction is gotten by the difference between the energy needed to break the bonds of reactants and the energy needed for the formation of products.

Therefore,when the reactants have less enthalpy than the products, then heat energy is given out.

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The compound with the highest boiling point is [tex]CH_{3} CH_{2} OH[/tex] .

So, option C is correct one.

The boiling point depend two factors,

The boiling point of ether is less than alcohols because alcohol form hydrogen-bonding .The hydrogen bond is strongest bond. So, ethyl alcohol and methyl alcohol has more boiling point than dimethy ether.

The propane molecules have only van-der waals force of attraction, which is weakest force of attraction.So, propane has lowest boiling point.

The molecular mass of ethanol is greater than methaol. So, ethanol has higher boiling point.

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Rusting of Iron is the formation of rust which is characterized by formation of layer of red colour. Formula of Rust is Ferric Oxide (Fe₂O₃) where iron exhibits oxidation state of +3.

Following are the indicators of rusting:

Even if the Reddish brown rust is not visible on the iron surface, then also Ferroxyl Indicator turns blue in presence of Iron ions.

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Answer:

Chemical energy is defined as. the energy which is stored in the bonds of chemical compounds (molecules and atoms).

Explanation:

Chemical energy may be released during a chemical reaction

Answer:

Chemical energy is the energy stored in the chemical bonds of Compound.

It's used during chemical Reactions.

The δs∘rxn  for the reaction [tex]2NO(g) + O_{2}[/tex] → [tex]2NO_{2} (g)[/tex] will be -146 J/K.

Entropy would be a measurable physical characteristic and a scientific notion that is frequently connected to a condition of disorder, unpredictability, or uncertainty.

Entropy would be a measurement of the system's unpredictability or disorder. The entropy increases as randomness do. It has broad properties as well as a state function. It has the unit [tex]JK^{-1} mol^{-1}[/tex].

Entropy of the reaction can be calculated by the reaction.

Δ[tex]S^{0} rxn[/tex] = 2 mol × [tex]S^{0} (NO_{2} (g) - 2 mol[/tex] × [tex]S^{0} NO (g)[/tex] - 1 mol × [tex]S^{0} (O_{2} )[/tex]

Δ[tex]S^{0} rxn[/tex]  = 2 mol × 240 J/mol.K - 2 mol × 210 J/mol.K-1 mol  ×205.2 J/mol.K

Δ[tex]S^{0} rxn[/tex]  = -146.8 J/K

Therefore, the δs∘rxn  for the reaction [tex]2NO(g) + O_{2}[/tex] → [tex]2NO_{2} (g)[/tex] will be -146 J/K.

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A. The volume of water (in litres) produced at SATP is 42.73 L

B. The volume of oxygen consumed in the experiment is 55.55 L

C. If the conditions were converted from SATP to STP, the volume of water (in litres) produced is 38.64 L

Mole = mass / molar mass

Mole of C₂H₁₀ = 20 / 58

Mole of C₂H₁₀ = 0.3448 mole

Balanced equation

2C₄H₁₀ + 13O₂ -> 8CO₂ + 10H₂O

From the balanced equation above,

2 moles of C₄H₁₀ reacted to produce 10 moles of water.

Therefore,

0.3448 mole of C₄H₁₀ will react to produce = (0.3448 × 10) / 2 = 1.724 mole of water

Thus, the volume of water (in litres) produced at SATP can be obtained by using the ideal gas equation as follow:

PV = nRT

Divide both sides by P

V = nRT / P

V = (1.724 × 0.0821 × 298) / 0.987

Volume of water produced at SATP = 42.73 L

Balanced equation

2C₄H₁₀ + 13O₂ -> 8CO₂ + 10H₂O

From the balanced equation above,

2 moles of C₄H₁₀ reacted with 13 moles of O₂

Therefore,

0.3448 mole of C₄H₁₀ will react with = (0.3448 × 13) / 2 = 2.2412 moles of O₂

Thus, the volume of O₂ (in litres) consumed at SATP can be obtained by using the ideal gas equation as follow:

PV = nRT

Divide both sides by P

V = nRT / P

V = (2.2412 × 0.0821 × 298) / 0.987

Volume of O₂ consumed = 55.55 L

PV = nRT

Divide both sides by P

V = nRT / P

V = (1.724 × 0.0821 × 273) / 1

Volume of water produced at STP = 38.64 L

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The equilibrium vapour pressure of diethyl ether and ethanol at room temperature or at 20°C is 442mm and 5.95kPa.

The pressure exerted by gas in equilibrium state with a solid or liquid in container at a given temperature is termed as vapour pressure.

Surface area:

The surface area of solid of liquid which is in contact with the gas do not much affect the vapour pressure.

Type of molecules:

Greater the intermolecular face small will be smaller will be vapour pressure, if lesser the force then greater will be the vapour pressure.

Temperature:

At high temp.,more molecules has enough energy to escape from the liquid or solide. At lower temp. feuer molecule escape enhance lesser tha vapour pressure.

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The 59 co is 100 % stable nuclei that's why it will not show  any kind of decay, have not any daughter nucleus.

The process of radioactive decay describes how an unstable atomic nucleus releases energy through radiation. A substance that has unstable nuclei was regarded as radioactive. Alpha, beta, as well as gamma decay, are three of the most poses significant of decay, as well as they all entail the emission of one or maybe more particles.

Every atom strives to have the greatest degree of stability. When the proportion of protons as well as neutrons in the atomic nucleus is out of balance, instability results in radioactive decay. In essence, the nucleus contains too much energy to keep all the nucleons together.

Therefore, the 59 co is 100 % stable nuclei that's why it will not show  any kind of decay, have not any daughter nucleus.

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If an aluminum manufacturer does not bear the entire cost of the smoke it emits, it will.

release more smoke than what is socially acceptable.

Smoke is a mixture of airborne gases and particulates released during the combustion or pyrolysis of a substance, along with the amount of air entrained or otherwise mixed into the mass. It is frequently a waste product of fires, such as those caused by stoves, candles, internal combustion engines, oil lamps, and fireplaces, but it can also be used for other purposes, such as fumigation, communication, military defensive and offensive capabilities, cooking, or smoking (tobacco, cannabis, etc.). It is utilized in ceremonies when sage, resin, or incense are burned to create a scent for occult or spiritual purposes. It can also function as a preservative and flavor.

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[tex]\leadsto[/tex] In what type of bonds do atoms join together because their opposite charges attract each other?

O metallic bonds and ionic bonds

O metallic bonds and covalent bonds

● Ionic bonds and hydrogen bonds ✓

O ionic bonds and covalent bonds

During bonding, the metals tend to lose electrons while the non-metals gain electrons. These ions with opposite charges will attract one another, creating an ionic bond. Similarly, for hydrogen, it is a weak bond that occurs due to the electrostatic attraction between a proton in one molecule and an electronegative atom in the other.

The type of bond in which atoms join together because their opposite charges attract each other is ionic bonds and hydrogen bonds. The correct option is C.

Ionic bonds are those bonds that are formed by the difference in the electrostatic charge between the molecules. Ex; sodium chloride.

Hydrogen bonds are formed between the hydrogen atom and the atom that are more electronegative than hydrogen.

Metals typically lose electrons during bonding, whereas non-metals typically gain electrons. These ions will be drawn to one another by their opposing charges, forming an ionic connection.

Similar to this, the electrostatic attraction between a proton in one molecule and an electronegative atom in the other results in a weak link for hydrogen.

Thus, the correct option is C, ionic bonds, and hydrogen bonds.

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The concentration of hydroxide ion of a solution with a pH of 8. 25 is 1.77×[tex]10^{6}[/tex] M

Calculation,

The pH of a solution tells us about concentration of the [tex]H^{+[/tex] ion ( proton ) in solution. However, if we know the value of pH , we can calculate pOH with the help of pH and from pOH we can find concentration of hydroxide ions in the solution.

pH + pOH = 14

8. 25 + pOH = 14

pOH = 14 - 8. 25 = 5.75

Since, pH = -㏒[ [tex]H^{+[/tex] ]

Similarly, pOH = -㏒[[tex]OH^{-[/tex] ]

If pOH = 5.75 , that means that -㏒[[tex]OH^{-[/tex] ]  = 5.75 ,which means that,

[[tex]OH^{-[/tex] ]  = [tex]10^{-5.75}[/tex] = 1.77×[tex]10^{6}[/tex].

So, we know that the concentration of the [tex]OH^{-[/tex] ions in the solution with pH of 8.25 is 1.77×[tex]10^{6}[/tex] Molar

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Answer:

A shift in the global hydrologic cycle

Explanation:

During cold-climate intervals, known as glacial epochs or ice ages, sea level falls because of a shift in the global hydrologic cycle: water is evaporated from the oceans and stored on the continents as large ice sheets and expanded ice caps, ice fields, and mountain glaciers.

The hydrological cycle of the earth is the sum total of all processes in which water moves from the land and ocean surface to the atmosphere and back in form of precipitation. The hydrological cycle is dependent on various factors and is equally affected by oceans and land surfaces.

[tex] \large { \pink { \sf \: ⿻ANSWER⿻}}[/tex]

They are classified on the basis of their physical features- Shape and Appearance.

The four basic shapes of bacteria are Coccus (spherical or ovoid), bacillus (rod-like), vibrio (comma-shaped ), and spirilla (spiral or helical shaped).

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♪ ♫ Hope this helps :D

Answer:

Remains the same

Explanation:

Until the ice is all melted the water should remain at 0° C....

  the ice melting is a constant temp process and absorbs heat as it melts at 0 C

Answer:

6.4 L

Explanation:

When all other variables are held constant, you can use Boyle's Law to find the missing volume:

P₁V₁ = P₂V₂

In this equation, "P₁" and "V₁" represent the initial pressure and volume. "P₂" and "V₂" represent the final pressure and volume. You can find the theoretical volume by plugging the given values into the equation and simplifying.

P₁ = 3.2 atm                      P₂ = 1.0 atm

V₁ = 2.0 L                          V₂ = ? L

P₁V₁ = P₂V₂                                                    <----- Boyle's Law

(3.2 atm)(2.0 L) = (1.0 atm)V₂                        <----- Insert values

6.4 = (1.0 atm)V₂                                           <----- Simplify left side

6.4 = V₂                                                        <----- Divide both sides by 1.0

Answer:

6.4L or C on Brainly.

Explanation:

Answer:

a. true

Explanation:

It is true that, the materials in the flux covering on an electrode determine the electrical characteristics of the electrode.

The standard free-energy change for the reaction at 25°C is 92640 KJ.

The change in free energy that happens when a compound is created from its constituent parts in their most thermodynamically stable states under standard-state circumstances is known as the standard-state free energy of creation.

There are 6 electrons transferred. The anode half-reaction produces 6 electrons while the cathode half-reaction uses 6 electrons.

For these types of reactions always write out the half-reactions and the appropriate oxidation numbers.

6 electrons are transferred as Au³+ has an oxidation number of 3+ and Au has an oxidation number of 0. 3 electrons are gained for each Au³+ and there are 2 Au³+ in the equation

                         [tex]2Au^3 (aq) +3cr(s)[/tex] ↽−−⇀ [tex]2Au(s) +3Cr^2[/tex]

Same for Cr to Cr2+ because there are 3 moles of it.

So, n = 6.

     F = 96500 J/(V*mol)

     where  F is faraday's constant.

                 n = moles of electrons are transferred in this reaction.

Standard emf of the cell, E = cathode - anode.

                                             = 1.49 - 1.33

                                             = 0.16

Using the equation,

                                   ΔG = -nFE

                                         = 6 × 96500 × 0.16

                                         = 92640 KJ

Therefore, the standard free-energy change for the reaction at 25°C is 92640 KJ.

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The significant figures will be 1.

As, weight of acetylsalicylic acid = 0. 4 g

We obtain 400 mg when we convert 0.4g of acetylsalicylic acid to mg.

So, 400 milligrams are worth 0.4 grams when converted to grams.

There is just one significant figure because 0 before a decimal is not significant i.e. 4.

The digits of a number that have relevance in relation to the measurement's resolution are known as significant figures. Additionally known as significant figures in chemistry. All experimental measurements are subject to some degree of uncertainity.

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When an electron passes through the magnetic field of a horseshoe magnet, the electron's direction is changed.

Path of an electron in a magnetic field

The force (F) on wire of length L carrying a current I in a magnetic field of strength B is given by the equation:

F = BIL

But Q = It and since Q = e for an electron and v = L/t you can show that :

Magnetic force on an electron = BIL = B[e/t][vt] = Bev where v is the electron velocity

In a magnetic field the force is always at right angles to the motion of the electron (Fleming's left hand rule) and so the resulting path of the electron is circular.

Therefore :

Magnetic force = Bev = mv2/r = centripetal force

v = [Ber]/m

and so you can see from these equations that as the electron slows down the radius of its orbit decreases.

If the electron enters the field at an angle to the field direction the resulting path of the electron (or indeed any charged particle) will be helical. Such motion occurs above the poles of the Earth where charges particles from the Sun spiral through the Earth's field to produce the aurorae.

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The IUPAC names of the given compounds are 3-methylpentane, 1,3-butadiene, 1,3-dimethylcyclohexane, 2,3,5,5-tetramethyl-1,3-hexadiene, and 2,2-dimethylpentane respectively.

Thus, following the IUPAC nomenclature rules the name of the given compounds are as follows:

3-methylpentane

1,3-butadiene

1,3-dimethylcyclohexane

2,3,5,5-tetramethyl-1,3-hexadiene

and 2,2-dimethylpentane

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Answer: Everything can dissolve in water because water is considered a universal solvent

Explanation: Liquid water is cooler than solid salt and sugar, allowing them to dissolve easily.

According to the concept of solubility, as water is considered to be a universal solvent salt and sugar both are able to dissolve in water as water is a universal solvent.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.

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The moles are the estimation of the quantities like the molecules and the atoms. There are 7.984 moles of aluminum present in the 2.154 × 10⁻¹ kg substance. Thus, option b is correct.

The moles give the estimation of the smaller entities by the ratio of mass or weight to the molar mass of the substance.

The formula for moles is given as,

Moles = mass ÷ molar mass

Given,

Mass of aluminium = 2.154 × 10⁻¹ kg = 2.154 × 10² gm

Molar mass of Al = 26.9 g/mol

Substituting values above:

Moles = 2.154 × 10² gm ÷ 26.9 g/ mol

= 7.984 mol

Therefore, option. 7.984 moles of aluminum are present.

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The seasonal shifts of Earth's planetary wind and moisture belts are due to changes in the latitude that receives the sun's vertical rays.

The latitude refers to the specific geographic coordinates at some point of the Earth in relation to the Equator line.

Latitude and longitude are geographic coordinates that allow to localize a specific point in the world by using the center of the Earth's planet as point of origin.

The amount of sun rays received by a given latitude largely depends on the season since the Earth's planet has a light inclination that alter this amount of radiation.

In conclusion, the seasonal shifts are due to changes in the latitude that receives the sun's vertical rays.

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Explanation:

metallic conduction:the movement of electrons through a metal, with no changes in the metal and no movement of the metal atoms.

I hope this help uuhh............

Hydration number is 9

Given:

molar mass of na2so4•nh2o = 304.04 g/mol

To Find:

hydration number 'n'

Solution: hydration number is the number of molecules of water with which an ion can combine in an aqueous solution of given concentration.

Atomic mass of Na = 23g

S = 32g

0 = 16g

H = 1g

Molar mass of the compound is evaluated as:

2(23) +32 + 4(16) + n[2(1) +16] = 304.04

46 +32 +64 +18n = 304.04

142 +18n = 304.04

18n = 304.04 - 142

18n = 162.04

n = 9

So, hydration number is 9

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The volume of the balloon at an altitude where the pressure is 530 torr if the temperature remains constant is 4.33 L

Calculation,

According to Boyle law, the pressure of a given quantity of gas varies inversely with its volume at constant temperature.

[tex]P_{1} V_{1} =k[/tex]            .....(i)

[tex]P_{1}[/tex]  is initial pressure =765 torr

[tex]V_{1}[/tex] is initial volume = 3L

k is constant

[tex]P_{2} V_{2} =k[/tex]             ....(ii)

[tex]P_{2}[/tex] is final pressure = 530 torr

[tex]V_{2}[/tex]  is final volume =?

k is constant

Combining equation (i) and (ii). we get,

[tex]P_{1} V_{1} =P_{2} V_{2}[/tex]

765 torr × 3L= [tex]V_{2}[/tex]  ×530 torr

[tex]V_{2}[/tex]   =  765 torr × 3L/530 torr = 4.33 L

Boyle law used during respiration or breathing.

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Heat change at constant volume for the combustion of carbon monoxide = -67.71 Kcal

CO(g) + 1/2O2(g) ⟶ CO2(g)

From the above reaction,

∆ng = nP - nR = 1 - ( 1/2 + 1 )

∆ng = - 1/2

Temperature (T) = 17°C (17+ 273) K = 290K (Given)

Now from first law of thermodynamics,

∆H = ∆E + ∆ng RT

ΔΗ = -67.71 + (-1/2) x 2 x 10^-3 x 290

∆H = -67.71 - 0.29 = -68 Kcal

Hence the heat of reaction at constant pressure will be -68 Kcal

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The concentration of [ Hy³] = 4.861 *28⁻²³

The concentration of a solution is a measure of the amount of solute that has been dissolved in a given amount of solvent or answer. A focused answer is one which has a exceedingly massive quantity of dissolved solute. A dilute answer is one that has a tremendously small amount of dissolved solute.

Given,

 Molarity of VoSo4 ,M = 0.02M

     Vol of VoSo4 , V = 10 ml

Molarity of EDTA = 0.02 M

vol of EDTA = 9.10 ml = 0.0091 L

& 10 ml of buffer with pH =4

NOW,

     no. of moles of EDTA = molarity * Volume (L)

                                         =  0.02 M * 0.0091 L

                                        = 182 * 10^-6 moles

                                        = 1.82 * 10^-4 moles

Now,

       ∝ Y^3- = [tex]\frac{[Y^3-]}{moles of edta}[/tex]

         [ Y^3-] = ∝ Y^3- * moles of EDTA

Given,

at pH = 4,   ∝ Y^3- = 3*10^-9

    ∴ ∝ Y^3- =  3*10^-9

        [ Y^3-] = 3*10^-9 * 1.82 * 10^-4

                   = 5.46 * 10^-13

Now, K f = [H2Y^2-]/[vo^2+][y3-]

           [vo^2+] = 18.7

[H2Y2-] = K f * [ v o+][Y^2-]

    [H2Y2] = 3.762 * 10^-13

 [ HY^3-] = 4.8 * 10^-23

So, the concentration of the    [ HY^3-] is 4.8 * 10^-23

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The reaction between m-cresol and sodium hydroxide will create sodium m-cresolate and water.

The structure of the organic creation (sodium m-cresolate) and the reaction is described in the attached picture.

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