Use the bond energy to calculate an approximate value of ΔH for the following reaction. Which is the more stable form of FNO2?

The use of the pH scale and litmus paper are the ways which can determine whether the solution is an acid or base.

The pH scale is the way which determine the acidic or basic nature of a solution. If the pH of a solution is less than 7, it is considered as acidic. If the pH is 7, the solution is neutral and if the pH is greater than 7,the solution is basic.

While on the other hand, litmus paper also tells us about acidic and basic nature of solution. if the litmus paper turns red, it means the solution is acidic whereas if the litmus paper turns blue it means basic.

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Taking into account the Brønsted-Lowry acid-base theory, HPO₄⁻² is conjugate base of H₂PO₄⁻.

The Brønsted-Lowry acid-base theory (or the Brønsted-Lowry theory) identifies acids and bases based on whether the species accepts or donates protons or H⁺.

According to this theory, acids are proton donors while bases are proton acceptors.

So, reactions between acids and bases are H⁺ proton transfer reactions, causing the acid to form its conjugate base and the base to form its conjugated acid by exchanging a proton.

In other words, a conjugate base is an ion or molecule resulting from the acid that loses the proton, while a conjugate acid is an ion or molecule resulting from the base that gains the proton:

acid + base ⇄ conjugate base + conjugate acid

In this case, you know:

H₂PO₄⁻ + NH₃ → HPO₄⁻² + NH₄⁺

H₂PO₄⁻ behaves like acid because donates an H⁺ proton while NH₃ behaves like base because accepts an H⁺ proton from the acid.

So, NH₄⁺ is the conjugate acid of the NH₃ and HPO₄⁻² is conjugate base of H₂PO₄⁻.

In summary, HPO₄⁻² is conjugate base of H₂PO₄⁻.

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Answer:

52 g/L

Explanation:

First, 400 mL / 1000 = 0.4 L

20.8 g / 0.4 L = 52 g /L

Answer:

0.01

Explanation:

100 -80=20

200/20=10/1000=0.01kj

Answer:

A mol (approximately)represents the number 6.02 X 10^^23. Mols become useful when we learn that, for any element on the periodic table, 6.02 X 10^^23 atoms of that element have a mass equal to the atomic mass in grams. So, on the periodic table carbon has an atomic mass of 12.011. That means: 12.011 grams of carbon is made up of 6.02 X 10^^23 atoms.

The above question is tricky.

If the question considers 1 molecule of SO2 as a particle, then the answer is 1.80 * 6.02 X 10^^23

If the question considers the S as one particle, and the O2 as 2 more particles, then the answer is: 3 * 1.8 * 6.02 X 10^^23.

Explanation:

hope it helps U

Answer:

8 grams

Explanation:

trust

The balanced chemical equation for the reaction between chromium and bromine to produce chromium(III) bromide is:

2 Cr + 3 Br2 → 2 CrBr3

This equation shows that two chromium atoms react with three molecules of bromine to form two molecules of chromium(III) bromide.

A redox reaction is a type of chemical reaction that involves the transfer of electrons between reactants. The term "redox" comes from the combination of two processes during the reaction: reduction, which involves the gain of electrons by a reactant, and oxidation, which involves the loss of electrons by a reactant.

The reaction is an example of a redox reaction, where reduction and oxidation occur simultaneously. Chromium is oxidized, while bromine is reduced. The reaction also shows the importance of balancing the number of atoms on both sides of the equation to ensure that the law of conservation of mass is satisfied.

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Answer:

I think 50%

Explanation:

im not really sure

Answer:

Stacking bags and bundles.

Explanation:

Interlock them in rows to ensure they're secure.

Answer:

Material Storage Facilities means an uncovered area used on a permanent basis for outside

Explanation:

Material Storage Facilities means an uncovered area where bulk materials (liquid, solid, granular, etc.) are stored in piles, barrels, tanks, bins, crates, or other means.

Additional Benchmarks for Federal, State, or Municipal Facilities with Incidental Solid De-Icing Material Storage Facilities monitoring under the requirements of subparagraph (D)(ii) above shall not be subject to Benchmark requirements for Chloride or Cyanide.

Directors are fully briefed on all business related matters, risk assessment and new initiatives proposed by the Company.

Answer:

Explanation:

alculate the (H3O+) for a solution whose pH is 6.79

Note: blank 1 should have three significant figures

The answer is: Blank 1 X 10^Blank 2

The pH of a solution is the negative logarithm of H₃O⁺ ion concentration.The concentration of H₃O⁺ ions in a solution with a pH of 6.79 is 1.6 × 10⁻⁷M.

pH of a solution is the measure of its acidity or basicity. Mathematically it is the negative logarithm of its  H₃O⁺ ion concentration. A solution with a pH of 7 is neutral.

The solution with a pH below 7 is acidic and above 7 is basic. Thus, the higher H+ ion concentration, then the pH will be lower and more acidic the solution.

It is given that the pH of the solution is 6.79. The concentration of  H₃O⁺ ions in the solution is calculated is calculated as follows:

pH   = -log ( H₃O⁺)

6.79 = -log( H₃O⁺

[ H₃O⁺] = antilog (-6.79)

             =  1.6 × 10⁻⁷M

Hence, the  hydronium ion H₃O⁺ ion concentration of the solution of pH 6.79 is  1.6 × 10⁻⁷M.

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Now

[tex]\\ \rm\rightarrowtail PV=nRT[/tex]

[tex]\\ \rm\rightarrowtail n=\dfrac{PV}{RT}[/tex]

[tex]\\ \rm\rightarrowtail n=\dfrac{89.9(25)}{5R}[/tex]

[tex]\\ \rm\rightarrowtail n=89.9(5)/R[/tex]

[tex]\\ \rm\rightarrowtail n=449.5/R mol[/tex]

Moles of O_2:-

Mass of O_2:-

Option B

As per the given balanced reaction, 0.75 moles of aluminum metal requires 0.56 moles of oxygen gas for completely reaction. One mole of oxygen gas is 32 g. Then, mass of 0.56 moles is 18 g.

Metals and metal like elements such as aluminum Al are more reactive towards atmospheric oxygen and forms their oxide layers in the metallic surface.

Al₂O₃ is an essential mineral of aluminum formed by the reaction with oxygen as given in the balanced chemical equation. As per this equation, 4 moles of Al requires 3 moles of oxygen for complete reaction.

The number of moles of oxygen required by 0.75 moles of Al is:

(0.75 × 3) /4 = 0.56 moles.

one mole of oxygen weighs 32 g/mol.

mass of 0.56 moles of O₂ = 32 × 0.56 = 18 g.

Therefore, the mass required by 0.75 moles of Al in the reaction is 18 g.

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From the law of conservation of mass, the mass of the glow stick does not change after the reaction.

From the law of conservation of mass we know that mass can neither be created nor  destroyed but is converted from one form to another. Since the mass of the system must remain unchanged, It then follows that the mass of the glow stick must remian the same.

Therefore, the mass of the glow stick does not change after the reaction following the law of conservation of mass.

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The minimum number of grams of I that must be present is ; 0.01836 * 10⁻³ mol

Given data :

Volume of solution to be tested for I-ion = 10 mL

Volume of  Pb(NO₃)₂ = 0.2 mL

molarity of Pb(NO₃)₂ = 0.13 M

First step : calculate conc of PB²⁺ ions in the solution

conc of PB²⁺ ions =  ( molarity of Pb(NO₃)₂ * volume of  Pb(NO₃)₂ ) / ( total volume )

                              = ( 0.13 * 0.2 ) / ( 10 + 0.2 )

                              = ( 0.026 ) / ( 10.2 )  = 0.002549 M

Next step : determine the molarity of  I

using the dissociation reaction of PbI₂

PbI₂(s) ---> Pb²⁺ (aq)  + 2I (aq)

also;  Ksp = [ Pb²⁺ ] [ I ]²  ---- ( 1 )

From the question the given value of Ksp = 8.49 * 10⁻⁹

Therefore equation ( 1 ) becomes

8.49 * 10⁻⁹ = ( 0.002549 ) * [ I ]²

[ I ] = √ ( 8.49 * 10⁻⁹ ) / ( 0.002549 )

      = 0.0018 M

Final step : Determine the minimum number of grams of I

moles of I = molarity of I * total volume

                 = 0.0018 M * 10.2 mL

                 = 0.01836 * 10⁻³ mol

Hence we can conclude that The minimum number of grams of I that must be present is ; 0.01836 * 10⁻³ mol

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Answer:

yes of course is true the

Answer:

3

Explanation:

pH + pOH = 14

pH + 11 = 14

pH = 3

socraticorgquestionshowdoyoucalculatethephofasolutionwhengiventheohconcentration

Anthony F  BRIAN M

Hexasulfur Dichloride

Name: Hexasulfur Dichloride

Formula: S2Cl6

Molar Mass:276.848

Example Reactions:

• S2Cl6 + 4H2O = 2SO2 + 6HCl + H2

Answer:

Distillation can be used to separate and collect a liquid from a solution. Distillation can also be used to soften water as the water evaporates as it is heated and the ions are left behind. Hard water can be softened by adding sodium carbonate (washing soda) or by passing the water through an ion-exchange column.

Explanation:

The mass, in grams, of 5.2 x 10^28 atoms of manganese would be 0.0006833 grams

According to Avogadro, 1 mole of any substance contains 6.022 x [tex]10^{23}[/tex] atoms.

Thus, how many moles would be in 5.2 x [tex]10^{28}[/tex]atoms of Mn:

         = 6.022 x [tex]10^{23}[/tex] /1 x 5.2 x [tex]10^{28}[/tex]

                       = 0.00001158 moles

Mass of 0.00001158 moles Mn = 0.00001158 x 54.9

                         = 0.0006833 grams

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Carbonic acid is a weak acid. Its weak ionization constant (Ka) is equal to:

Ka = [H⁺] [HCO₃⁻] / [H₂CO₃]

A weak acid is an acid that dissociates partially in the water.

The equation for the acid dissociation of carbonic acid is:

H₂CO₃ ⇄ H⁺ + HCO₃⁻

The weak ionization constant (Ka) is the equilibrium constant for this reaction, that is, the product of the concentration of the products divided by the product of the concentrations of the reactants, all of them raised to their stoichiometric coefficients.

Ka = [H⁺] [HCO₃⁻] / [H₂CO₃]

Carbonic acid is a weak acid. Its weak ionization constant (Ka) is equal to:

Ka = [H⁺] [HCO₃⁻] / [H₂CO₃]

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Answer:

To what temperature must a sample of helium gas be cooled from 22.2 degrees C to reduce its volume from 1.00L to 100cm3 ?

Explanation:

Answer:

water has a high specific heat

Explanation:

this should work as an answer

Answer:

28ft

Explanation:

if it's a square then each side is equal

the square root of 49 is 7

each side is 7 ft

7 ft times 4 sides is 28ft

Answer:

[tex]ch3ch2oh \: is \: alcohol \\ because \: it \: havve \: an \: oh \: grp \: \\ thank \: you[/tex]

Given the molecular formula of aspirin, C₉H₈O₄, in 1.50 moles of aspirin there are 13.5 moles of carbon.

The mole is the SI base unit for the amount of matter. 1 mole of particles contains a number of Avogadro's particles.

We have 1.50 moles of aspirin, C₉H₈O₄. According to the molecular formula, the molar ratio of C₉H₈O₄ to C is 1:9.

1.50 mol C₉H₈O₄ × (9 mol C/1 mol C₉H₈O₄) = 13.5 mol C

Given the molecular formula of aspirin, C₉H₈O₄, in 1.50 moles of aspirin there are 13.5 moles of carbon.

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The reaction rate is affected if the vitamin C is added in lower quantity due to lower amount of reactants.

If you added 40.0 mL of Vitamin C stock solution instead of 25.0 mL when preparing Solution, the reaction rate is affected because of the lower amount of reactant for the chemical reaction. If the reactants are present in larger amount then the products are also produced in large concentration.

So we can conclude that the reaction rate is affected if the vitamin C is added in lower quantity due to lower amount of reactants.

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Answer: b

Explanation:

Answer:

what is picture 4 you need to show it