Does Borax pure substance?

Answer:

0.1795 M

Explanation:

From the given information:

The equation is:

[tex]\mathbf{HF_{(aq)}+ KOH_{(aq)} \to KF _{(aq)} + H_2O}[/tex]

From the above equation, the reaction will go to completion due to the strong base:

At the equivalence point, moles of acid (HF) will be equal to moles of base (KOH)

[tex]\text{Number of moles = Volume} \times Molarity[/tex]

Thus. since moles of HF = moles of KOH

Then; 0.020 × 0.393 M = 0.02379 × (x) M

(x) M = [tex]\dfrac{0.02 \times 0.393 \ M}{0.02379}[/tex]

(x) = 0.3304 M

Thus, the molarity of KOH = 0.3304 M

Using the balanced neutralization reaction;

moles of HF = moles of KOH = moles of conjugate base = 0.00786 mol

∴

Volume = 0.020 L + 0.02379 L

Volume = 0.04379 L

Volume of the solution =  0.04379 L

Therefore; Molarity = [tex]\dfrac{moles}{volume}[/tex]

Molarity = [tex]\dfrac{0.00786 \ mol}{0.04379 \ L}[/tex]

Molarity = 0.17949 mol/L

= 0.1795 M

After the initial neutralization, the molarity at the equivalence point will be:

"0.17949 mol/L"

According to the question,

→ HF (aq) + KOH (aq) [tex]\rightarrow[/tex] KF (aq) + H₂O

Since, moles of HF = moles of KOH

We know that,

Number of moles = Volume × Molarity

→ 0.020 × 0.393 = 0.02379 × M

By applying cross-multiplication,

The molarity of KOH be:

M = [tex]\frac{0.02\times 0.393}{0.02379}[/tex]

   = [tex]\frac{0.00786}{0.02379}[/tex]

   = 0.3304 M

By using balanced neutralization reaction,

Volume = 0.020 + 0.02379

             = 0.04379 L

hence,

The molarity will be:

= [tex]\frac{Moles}{Volume}[/tex]

By substituting the values,

= [tex]\frac{0.00786}{0.04379}[/tex]

= 0.17949 mol/L

Thus the response above is correct.

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Answer:

The sound waves travel from the outer ear and in through the auditory canal, causing the eardrum, or tympanic membrane, to vibrate. This, in turn, causes the three small bones, known as the ossicles, or the hammer, the anvil and the stirrup, in the middle ear to move.

Answer:

215 moles

Explanation:

[tex]9.6mol CO_{2} (\frac{22.4 L CO_{2}}{1 mol CO_{2}} ) = 215 L CO_{2}[/tex]

Answer:

is is the process of combination of two or more small nuclei to form large nucleus having large amount of energy

Answer:

8.42 moles (3 sig. figs.)

Explanation:

Given 5.07 x 10²⁴ atoms of antimony (Sb) => ? moles Sb

1 mole of any substance contains 6.02 x 10²³ particles ( atoms or molecules)

∴ Think in terms of 'how many 6.02 x 10²³'s are in 5.07 x 10²⁴ atoms Sb?

That is => moles Sb = 5.07 x 10²⁴ atoms Sb / 6.02 x 10²³ atoms Sb/mole Sb

= 8.42192691 moles Sb (calculator answer) ≅ 8.42 moles (3 sig. figs.)

Answer:

because of the testicles

Explanation:

Answer:

his is an example of a first-year chemistry question where you must first convert two of the pressures to the units of the third and add them up, per Dalton’s law of additive pressures. There are three possible answers, one for each of the three pressure units.

1 atm = 760 torr …… torr and mm Hg are the same

1 atm = 101.3 kPa

Dalton’s law:

P(total) = P(O2) + P(N2) + P(CO2)

Explanation:

Gases will assume whatever pressure depending on the equation of state of the mixture (in this case) and the volume htey are contained in. That could be the ideal gas law and simple mixing law, If you are quoting the partial pressures which you call simply “the pressure” of each gas, and that these refer to their values in the present mixture, then yes, we would add them up. The pressures are low enough for the ideal gas law to apply provided the temperature is not extremely low as well .

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Answer: HSO4-

Explanation:

I hope this helped!

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Answer:

The pH of a solution is a measure of the concentration of hydrogen ions in the solution. A solution with a high number of hydrogen ions is acidic and has a low pH value. A solution with a high number of hydroxide ions is basic and has a high pH value. The pH scale ranges from 0 to 14, with a pH of 7 being neutral.

Answer:

Na+H2O =NaO+ H2

Explanation:

Because nitrogen is one , so it is balanced. And Oxygen is one,it is balanced. And Hydrogen is 2 ,and hence it is also balanced.

Answer:

The percent composition of dichlorine heptoxide is 38.76% CI and 61.24% O

Answer:

38.76%cl and 61.24%o

Explanation:

the percent composition of dichlorine heptoxide is 38.76%Cl and 61.24%O

Answer:

0.364

Explanation:

Let's do an equilibrium chart for the reaction of combustion of ammonia:

2NH₃(g) + (3/2)O₂(g) ⇄ N₂(g) + 3H₂O(g)

4.8atm 1.9atm 0 0 Initial

-2x -(3/2)x +x +3x Reacts (stoichiometry is 2:3/2:1:3)

4.8-2x 1.9-(3/2)x x 3x Equilibrium

At equilibrium the velocity of formation of the products is equal to the velocity of the formation of the reactants, thus the partial pressures remain constant.

If pN₂ = 0.63 atm, x = 0.63 atm, thus, at equilibrium

pNH₃ = 4.8 - 2*0.63 = 3.54 atm

pO₂ = 1.9 -(3/2)*0.63 = 0.955 atm

pH₂O = 3*0.63 = 1.89 atm

The pressure equilibrium constant (Kp) is calculated with the partial pressure of the gases substances:

Kp = [(pN₂)*(pH₂O)³]/[(pNH₃)²*]

Kp = [0.63*(1.89)³]/[(3.54)²*]

Kp = 4.2533/11.6953

Kp = 0.364

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Answer: 1000x

Explanation:

I hope this helped!

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can you show the options? i'm pretty sure it's "before"

Answer:

the answer is According to fossil records scallops live before dinosaurs

Explanation:

before

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Answer: HBr + NaOH = nabr + h2o

Explanation:

I hope this helped!

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Answer:

Ai --> Bii

Aii --> Bi

Aiii --> Bv

Aiv --> Biii

Av --> Biv

Explanation:

For Ai, naphthalene sublimes directly from a solid to gas when heated at around 80 degree Celsius.

For Aii, Ozone has a molecular formula of O₃.

For Aiii, weeds are normally considered as "unwanted" plants. Many people may consider using herbicides to clear the weeds in their gardens.

For Aiv, filtration is a physical method for separating solid and liquid from a mixture. A filter paper is normally used, in which the complex structure of the paper only allows fluid to pass through it, but not the solid ones. The solid left behind on the filter paper is called "residue".

For Av, photosynthesis is a chemical reaction that occurs in the leaves of a plant, which produces food for plants to survive. Carbon dioxide, water and light are required for photosynthesis to take place.

Answer:

I think D

Explanation:

Your cell phone number and your driver's license number are the numbers of your personal life that are exact.

In this context, an exact number refers to a number that if it undergoes any modification will not refer to the same thing that it referred to before that modification.

For example, my phone number is 12345. This number is exact because it cannot be changed because or else it would cease to be my phone number, that is, if someone wants to call me and writes the number 12346 it is no longer my number.

Addicionally, if my driver's license number is 112233 it is an exact number because if it is modified it would be the number of another driver.

According to the above, options B, C, and E are incorrect because they are inaccurate numbers because if they are modified they all refer to me and they would not change their meaning.

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Answer:

Farenheit

Explanation:

STP is used to measure standard temperature and pressure -- it uses Kelvin for temperature, not Farenheit.

Answer:

x = 11

Explanation:

2x - 9 = 13

2x = 13 + 9

2x = 22

x = 11

Answer:

103.9 g

Explanation:

First we convert 54.0 g of propane (C₃H₈) into moles, using its molar mass:

Then we convert 1.23 moles of C₃H₈ into moles of CO₂, using the stoichiometric coefficients:

We convert 3.69 moles of CO₂ into grams, using its molar mass:

And apply the given yield:

Answer:

(a) The most acidic compound - oxalic acid

    The least  acidic compound - acetic acid

(b) The most acidic compound - 2,4-dinitrobenzoic acid

   The least acidic compound -  p-bromobenzoic acid

(c) The most acidic compound - benzoic acid

    The least acidic compound - cyclohexanol

Explanation:

(a) Presence of electron donating group decreases the acidity of carboxylic acid. Therefore , acetic acid is least acidic due to methyl group on carbon of          -COOH group.

Oxalic acid is the most acidic compound due to presence of 2 -COOH group.

(b) Presence of electron withdrawing group increases the acidity of benzoic acid. 2,4-dinitrobenzoic acid will be more acidic as it has two strong electronegative substituents ([tex]-NO_2[/tex] group).

p-bromobenzoic acid will be less acidic than p-nitrobenzoic acid beacuse Br is weaker electron withdrawing group than [tex]NO_2[/tex]

(c) pKa value of benzoic acid(4.45) is more than other compounds and cyclohexanol has least pKa value (16).(Since , higher the pKa value , least acidic the compound is )

Answer:

13,basic would be your answer!

Explanation:

Answer: its combustion

Explanation:

Answer:

It says right under here what to do

Explanation

Determine the moles of product produced by dividing the grams of product by the grams per mole of product. You now have calculated the number of moles of every compound used in this reaction. 41.304 g of NaCl ÷ 58.243 g/mol = 0.70917 moles of NaCl.

Answer:

A

Explanation:

Potential energy is stored energy. Kinetic energy is energy of motion.