Calculate the theoretical pH at equivalence for this titration. Show all your work. 10.00mL of methanoic acid initial volume

Answer

Explanation

Given unbalanced equation:

NH₃ + O₂ → ___NO₂ + _H₂O

Step 1: Balance the N atom on both sides by putting 4 as the coefficient of NH₃ and NO₂ on the reactant and product sides of the equation respectively.

4 NH₃ + O₂ → 4 NO₂ + _H₂O

Step 2: Balance the H atom on both sides by putting 4 as the coefficient of NH₃ and NO₂ on the reactant and product sides of the equation respectively.

13.1% m/v is  the mass percent by volume of 44.1 g of glucose (C₆H₁₂O₆, MM = 180.2 g/mol) in 325 mL of solution.

[tex]% m/v=mass solute/volume solution * 100%=42.6g/325mL *100%=13.1%m//v[/tex]% m/v = mass solute/volume solution x 100%

[tex]% m/v=mass solute/volume solution * 100%=42.6g/325mL *100%=13.1%m//v[/tex]% m/v =44.1g/325 mL x 100%

[tex]% m/v=mass solute/volume solution * 100%=42.6g/325mL *100%=13.1%m//v[/tex]% m/v =13.1% m/v

An object's volume in three dimensions is determined by the area encompassed inside its boundaries. It is also known as the object's capability on occasion. Calculating how much is required to fill an object can be done using its volume; for example, how much water is required to fill a bottle, aquarium, or water tank.

The most fundamental and typical kind of three-dimensional form is a sphere. Spheres are frequently seen as balls, globes, holiday lights, oranges, etc.

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H₂O is the Bronsted-Lowry base and HCl is the Bronsted-Lowry acid. Option C is correct.

Bronsted-Lowry acid is defined as the ion or molecule that donates a hydrogen ion (H⁺) in a chemical reaction. Since H⁺ is a proton, hence a Bronsted - Lowry acid is a proton donor meaning that we can determine the Bronsted - Lowry acid in a chemical reaction by simply looking out for the molecule that loses a hydrogen ion (proton).

From the chemical reaction given

We can see that hydrochloric acid (HCl) donates a proton to have one less proton on the product side than on the reactant. Therefore, HCl in this case will be the Bronsted-Lowry acid since it acts as the donor.

Similarly, a Brønsted-Lowry base is a molecule or ion that accepts hydrogen ions in a reaction. From the reaction, you can see that water (H₂O) is the molecule that accepts this hydrogen ion to form a hydronium ion (H₃O⁺). Hence, the water molecule will act as a Bronsted - Lowry base

KHC₈H₄O₄ would be neutralized by 25.25 ml of 0.1034 NaOH then the mass of KHC₈H₄O₄ is 5.151 g

Mass is a measure of the amount of matter in a substance or an object here given data is KHC₈H₄O₄ would be neutralized by 25.25 ml of 0.1034 NaOH

Then the reaction is

KHC₈H₄O₄ (aq) + NaOH (aq) → NaKC₈H₄O₄ (aq) + H₂O

Then the concentration of  NaOH is equal to the  0.1 M then we use this and the volume given above to determine the mass of KHC₈H₄O₄

0.1 mol/L NaOH (25.25 ml) ( 1 mol KHC₈H₄O₄/ 1 mol NaOH)  (204 g / 1 mol) = 5.151 g KHC₈H₄O₄

5.151 g mass of KHC₈H₄O₄ would be neutralized by 25.25 ml of 0.1034 NaOH

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The initial temperature of water can be calculated from the heat energy using calorimetric equation. The initial temperature is obtained as 18.65 °C.

Calorimetry is an analytical tool used to determine the heat energy absorbed or released in a chemical reaction. The heat  energy q, mass of the substance m and the specific heat capacity c with a temperature difference ΔT is written as follows:

q = m c ΔT.

Here, the heat energy required for raising the temparture of 125 g of waater to 45 °C is 13750 joules . Then, the initial temperature be x, then x can be calculated as follows:

13750 J  = 125 g × 4.18 J/g °C × (45 - x °C)

     x =   45 -  [ 13750 J / (125 g × 4.18 J/g °C) ]

        = 18. 65 °C.

Therefore, the initial temperature was 18. 65 °C.

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Question 1

Answer & explanation

Sodium chloride is commonly known as table salt. It is an ionic compound with the chemical formula NaCl.

NaCl is a compound

Question 2

Answer & explanation

It is possible to separate a solution by physical means.

The question requires us to calculate the energy of a photon given that its frequency is 7.87 × 10^15 Hz.

To calculate the energy of a photon, we can use the following equation:

where h is the Planck's constant (6.626 x 10^-34 Jxs) and f is the frequency (in Hz or 1/s). (Note that the unit Hz is equivalent to s^-1)

Then, applying the frequency provided and the Planck's constant to the equation, we have:

Therefore, the energy of the photon is 5.21 x 10^-18 J.

Explanation:

We are given: density of promethazine = 25mg/mL

: mass of promethazine = 15.0mg

Answer:

The nurse will draw up 0.60 mL.

Some oxidation number rules

1) The oxidation number of a free element is always 0. The atoms in He and N2, for example, have oxidation numbers of 0.

2) The usual oxidation number of hydrogen is +1.

3 The oxidation number of oxygen in compounds is usually -2. Exceptions include OF2 because F is more electronegative than O, and BaO2, due to the structure of the peroxide ion, which is [O-O]2-.

a) HF, H = +1 F = -1

b)

c) H₂0, H = +1 O = -2

d) Pl3, P = +3 I = -1

e) CS₂, C = +4 S = -2

f) Na₂O₂, Na = +1 O = -1

g) H₂CO3 H = +1 C =+4 O =-2

h) NO2 N = +2 O = -2

i) SO2-4 S =+6 O = -2

Answer

A. ethyl butanoate

Explanation:

Esters are known for their distinctive odors and are commonly used for food aroma and fragrances. The general formula of an ester is RCOOR'.

Esters are formed through reactions between an acid and an alcohol with the elimination of water.

Esters are named as if the alkyl chain from the alcohol is a substituent. No number is assigned to this alkyl chain. This is followed by the name of the parent chain from the carboxylic acid part of the ester with an –e remove and replaced with the ending –oate.

Hence, the name of the given ester is:

A. ethyl butanoate

As the hint says the first thing we have to do is to determine the molar mass of our compound. To do so we need the molar mass of one atom of each element present in our compound.

molar mass of Ec = 31.79 g/mol

molar mass of H = 1.01 g/mol

molar mass of O = 16.00 g/mol

Since one molecule of Ec₂H₄0₆ has 2 atoms of Ec, 4 atoms of H and 6 atoms of O, we can find the molar mass of Ec₂H₄0₆ like this:

molar mass of Ec₂H₄0₆ = 2 * molar mass of Ec + 4 * molar mass of H + 6 * molar mass of O

molar mass of Ec₂H₄0₆ = 2 * 31.79 g/mol + 4 * 1.01 g/mol + 6 * 16.00 g/mol

molar mass of Ec₂H₄0₆ = 163.62 g/mol

Now we can find the number of moles that we have in 127.49 g of Ec₂H₄0₆.

number of moles = mass of sample/molar mass

number of moles = 127.49 g / (163.62 g/mol)

number of moles = 0.7792 moles

Answer: Therea are 0.7792 moles in 127.49 g of our compound.

6.5 moles of gas will fill 1.7 litres at 1.3 atm at the temperature (in K). 546atmK273K=P, and 1atm273K = P.

Temperature is a measurement used to represent hotness and coolness on any of a number of scales, including Fahrenheit or Celsius. According to temperature, heat energy will naturally move from a hotter (body with a high temp) to a cooler (body with such a lower temperature) (one at a lower temperature).

The scrotum is the area of the body with the highest temperature (37°C), following by the ears, urine, as well as the mouth. The coldest temperature on human body that can usually be measured is the armpit (35.9°C).

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We have the ethanol combustion reaction to produce CO2 and water. The balanced equation of the reaction is:

We must first find the moles of ethanol corresponding to 421 grams. To do this we divide the mass by the molar mass of ethanol. The molar mass of ethanol is: 46.07g/mol. The moles of ethanol will be:

Now, by the stoichiometry of the reaction, we see that the Oxygen to Ethanol ratio is 9/4. So, the moles of oxygen needed will be:

We find the grams of oxygen by multiplying the moles by the molar mass. The molar mass of O2 is 31.9988g/mol.

Answer: To complete the combustion of 421 g of ethanol are needed 658 grams of oxygen

For the generation of oxygen gas, hydrogen peroxide is generally used and by means of a catalyst, the peroxide is decomposed into two compounds: Liquid water and oxygen gas. The reaction is as follows:

Word equation

Hydrogen peroxide --->Water + Oxygen

Formula equation

It is important to note that the reaction needs a catalyst.

Explanation:

We are given: 2.90mol of ideal gas

At STP: Pressure = 1 atm

: Temperature = 273.15 K

: R = 0.08205 L.atm/mol.K

Using the ideal gas law:

Answer:

V = 64.99 L

Explanation:

Step 1 - We need to rewrite the equation here:

4NH3+5O2 --> 4NO+6H2O

The ratio between ammonia (NH3) and the products are:

NH3 and NO:

4:4

NH3 and H2O:

6 H2O

So if we have 1.2 moles of ammonia:

1.2 moles of NH3 ---- x moles of NO

4 moles of NH3 ---- 4 moles of NO

x = 1.2 moles of NO

1.2 moles of NH3 --- x moles of H2O

4 moles of NH3 --- 6 moles of H2O

4x = 7.2

x = 7.2/4

x = 1.8 moles of H2O.

Answer: The total number of moles of products formed is 1.2 moles of NO and 1.8 moles of H2O.

Answer

Number of moles = 0.0025 mol

Step-by-step explanation:

Given that,

The volume of He at STP is 56.0 ml

Part a:

Find the mole

According to the standard conversion

1 mol = 22.4L

Firstly, we need to convert 56.0ml to L

This can be done by dividing by 1000

56.0mL = 0.056L

1 mole = 22.4L

x mole = 0.056L

Cross multiply

1 * 0.056 = x * 22.4

0.056 = 22.4x

Divide both sides by 22.4

x = 0.056 / 22.4

x = 0.0025 mole

Hence, the mole of Helium is 0.0025 moleHe

The number of grams in 0.2 moles of water is 3.602grams.

The mass of a substance can be calculated by multiplying the number of moles of the substance by its molar mass as follows:

Mass = molar mass × no. of moles

According to this question, there are 0.2 moles in water. Water has a molar mass of 18.01g/mol. The mass can be calculated as follows:

Mass = 0.2 moles × 18.01g/mol

Mass = 3.602grams.

Therefore, 3.602 grams is the mass of the water molecule.

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5.57 grams

Given the reaction between sodium and oxygen expressed as:

Given the following parameters

Mass of sodium = 16.0g

Determine the moles of sodium

According to stoichiometry, 4 moles of sodium reacts with 1 mole of oxygen, the moles of oxygen that reacted is given as;

Determine the mass of oxygen that reacted

Hence the mass of oxygen that reacted is 5.57 grams

Answer:

Atom 1 and Atom 4 of the elements below are in the same group in the periodic table.

Calculations:

We are given the following parameters :

• Mass = 2.55kg = 2.55*1000= 2550

• T1 = 21°C

• T2 = 37°C

• Specific heat of water = c = 1cal/g°C

We will calculate q (heat ) as follows :

Answer:

Explanation:

Here, we want to get the percentage by mass of the water molecules in the given compound

To get this, we have to divide the molar mass of water by the molar mass of the percentage and write the answer as a percentage

The molar mass of water is 18 g/mol

The molar mass of MgCO3 is 84 g/mol

Thus, the percentage by mass of water will be:

Answer:

Explanation:

Here, we want to get the correct answer choice

The limiting reactant is the reactant that gets used up and that dictates the amount of products we can have

Take for example, we want to build a car, and we have 5 steering wheels but 100 tyres

A car needs 1 steering wheel and 4 tyres. Thus, the number of steering wheels will determine the number of possible cars produced

The steering wheel is thus the limiting reactant

The correct answer choice is that the reactant that is usede up is the limiting reactant

Francium easily loses electrons than cesium

Both Cesium and Francium are Group 1 elements (Alkali metals). This shows that the elements in this group have one valence electron in their outermost shell and can easily lose this electron to form a stable atom.

According to the element in the group, Lithium has the least tendency to loose its valence electron while Francium has the highest tendency to lose its valence electron because its outermost electron gets further from the positive nucleus and less attracted by the nucleus compared to the Caesium element.

Also, the atomic size of Francium is greater than that of Caesium. This also shows that francium easily loses electrons than cesium

Answer:

As bond strength increases, the atoms in the bond are pulled more tightly together.

Explanation:

As the bond energy increases the bond length decreases

GOOD LUCK!

In chemistry, reduction means any of a class of chemical reactions in which the number of electrons associated with an atom or a group of atoms is increased.

You can say that a compound that is gaining electrons is being reduced.

The situation where the reduction is occurring is:

When the reduction occurs, the oxidation number (which is the superindex), it seems that is reducing this number. In this case, 2+ become 1-.

Remember: when the oxidation number is reducing, it means that the compound or element is a reduction (gaining electrons) and when the oxidation number is increasing, it means that it is oxidation (losing electrons) such as the other cases of the problem.

We have a change of pressure and temperature. To solve and find the new pressure we will assume that the volume and moles of the gas remain constant, therefore we can apply Gay-Lussac's law which tells us:

Where,

P1 is the initial pressure of the gas, 954atm

T1 is the temperature of the gas, 728K

T2 is the final temperature, 951K

P2 is the final pressure, =?

We clear P2 and replace the known data:

Answer: The new pressure will be 1246atm

ANSWER

The molarity of the solution is 0.25M

EXPLANATION

Given that;

The mole of NaOH is 2.5 mol

The volume of the solution is 10.0L

Follow the steps below to find the molarity of the solution

The molarity formula is given below as

Substitute the given data into the above formula

Therefore, the molarity of the solution is 0.25M

Step 1

The reaction provided:

Zn + S => ZnS (completed and balanced)

-------------------

Step 2

Information provided:

2.50 moles of Zn

1.00 mole of S

--------------------

Step 3

The limiting reactant limits the amount of product formed.

By stoichiometry, procedure:

Zn + S => ZnS

1 mole Zn ------------- 1 mole S

2.50 moles Zn -------------- X

X = 2.50 moles Zn x 1 mole S/1 mole Zn = 2.50 moles S

For 2.50 moles of Zn, 2.50 moles of S are needed but there is only 1.00 mole of S. Therefore, the limiting reactant is S.

Answer: Sulfur (S)

Answer:

a) 0.33 M

b) 2.63x10^-14 M

Explanation:

1st) It is necessary to write and balance the chemical reaction:

From the balanced reaction we can see that 1 mole of HClO4 reacts with 1 mole of NaOH.

2nd) Since the relation between the acid (HClO4) and the base (NaOH) is 1:1, the 0.10 moles of NaOH will react with 0.10 moles of acid:

So, in the solution 0.33 moles of HClO4 will remain unreacted, and the concentration of H3O+ will be 0.33M.

3rd) In this case we can proceed the same as in the first part:

In this case, the addition of 0.81 moles of NaOH neutralizes all the acid in the solution and 0.38 moles of the base will remain unreacted.

So, the concentration of OH- will be 0.38M, and it is necessary to calculate the pOH of the solution, because when OH- is left over, the solution will be basic:

The pOH of the solution is 0.42.

4th) Now with the pOH we can calculate the pH of the solution, with the following formula:

The pH of the solution is 13.58.

5th) Finally, with the value of pH and the pH formula, we can calculate [H3O+]:

So, the concentration of H3O+ is 2.63x10^-14M.