Phthalic acid ( H2C8H4O4) is a diprotic acid with a1=1.12×10−3 and a2=3.90×10−6. Determine the pH of a 0.294M phthalic acid ( H2C8H4O4 ) solution.

In order to separate the mixture of toluic acid, p-bromo-aniline, and anthracene, the difference in their physical properties such as solubility in organic or inorganic solvents is utilized.

The flow chart for the separation method is found in the attachment.

Mixtures are substances that consist of two or more substances that are physically combined together.

The physical properties of the components of the mixture are employed in the separation of the constituents of the mixture

In separating the given mixture, it is first dissolved in dichloromethane, and then dilute NaOH is added to separate the toluic acid in the aqueous phase. The toluic acid is then precipitated by adding HCl.

Dilute HCl is then added to the organic phase to separate p-bromo-aniline into an aqueous phase and then precipitated by adding 10% NaOH.

Anthracene is left in the organic phase.

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Answer:

It would generate a electro lithium nucleous

Answer:

Explanation:

Here, we want to know the volume of chlorine gas necessary to complete the reaction

We can start by writing a balanced equation of reaction as follows:

From the balanced equation, we can see that 1 mole of chlorine gas requires 2 moles of sodium metal

Now, let us get the number of moles of sodium metal that actually reacted

We have that as the mass of sodium metal divided by the atomic mass

The atomic mass of sodium metal is 23 amu

Thus, we have the number of moles as:

Since the mole ratio is 2 to 1, half of this number of moles is needed by the chlorine gas

Mathematically, 1 mole of a gas occupies a volume of 22.4 L at STP

the volume occupied by the calculated number of moles will be:

Answer: 0.132 moles of Na2SO4

Explanation:

Multiply the grams of Na2SO4 by the 1/molar mass of Na2SO4, which is the sum of all the elements 2(Na)+S+4(O)= 142.04.

The percentage of mass of 0.101g in 2.093g of vinegar comes out to be 4.8%. Mass percentage does not have any unit as numerator and denominator contains the same unit.

Mass percentage represents the the percentage of each element that is making a particular compound.

mass of vinegar solution =density of vinegar solution× volume of  vinegar solution

                                          =0.996 g/mL×2.00 mL

                                           =1.992g

Percentage of mass=(mass of acetic acid ÷ total mass of solution) x 100%

                                  =[0.101÷(0.101+1.992)]×100

                                 =0.048×100

                                  =4.8%

Thus the mass percentage of acetic acid is 4.8%

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Temperature is a measure of how hot a substance or radiation is expressed numerically.

There are three different types of temperature scales:

those that depend only on macroscopic properties and thermodynamic principles, like Kelvin's original definition;

those that depend on practical empirical properties of particles rather than theoretical principles;

and those that are defined by the average translational kinetic energy per freely moving microscopic particle, like an atom, molecule, or electron, in a body, like the SI scale.

How much heat is gained or lost by a sample can be calculated using the equation q = mcΔT, where m is the mass of the sample, c is the specific heat, and T is the temperature change (q).

Therefore,

q = m*c*ΔT

102.3 = 335 * 4.184 * ΔT

ΔT = 0.073 °c

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With a balanced reaction, we can determine the moles of products. The balanced equation will be:

FeCl3 + 3NH4OH → Fe(OH)3 + 3NH4Cl

They says that NH4OH is in excess, so, the limiting reactant will be FeCl3 and we will do all the calculations with this reactant.

We have to calculate the moles of FeCl3, we will use the molar mass:

Now, to calculate the moles of the products we must take into account the product/reactive ratios, for this we are guided by the coefficients that accompany the molecules.

Ratio Fe(OH)3 to FeCl3 = 1/1

Ratio NH4Cl to FeCl3 = 3/1

Moles of each product

Moles of Fe(OH)3

Moles of NH4Cl

The grams of each product we will find by multiplying the moles by the molar mass. So we have.

g of Fe(OH)3

g of NH4Cl

Here are all names of compounds in aqeous solution.

What is aqeous solution?

An aqeous solution is one in which the solvent is liquid water .

In this solution water act as a solvent.

Sol-

HBr- Hydrogen bromide

1-HBrO- hydrobromic acid

2-HCL-hydrochloric acid

3-H2O3- hydrogen peroxide

4- HC2H3O2- glacial acetic acid

5-H2SO4-sulfuric acid

6- H3ASO3- Arsenous acid

7- HNO2- Nitrous acid

8- HC104- Perchloric acid

9-H2C2O4- oxalic acid

10- H3pO4- phosporic acid

11-H2CrO4- chromic acid

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We are asked to find the temperature of hydrogen gas (H2) given certain pressure and temperature conditions. Since the pressure to which the gas will be subjected is low we can apply the ideal gas law which is represented by the following equation:

Where,

P= Pressure = 140kPa = 1.38169 atm

V= Volumen = 224 L

R= Ideal gas constant = 0.08206 (atm L)/(mol K)

n= Number of moles

T= Temperature in K

Now we are going to find the number of moles of the gas, n. We will use the molar mass of the hydrogen gas (2.01594g/mol). So, we have:

Now, we will clear the temperature T from the first equation:

We replace the known values:

So, the temperature of hydrogen gas will be 376.40K

-ZnO is the compound illustrated by the law of constant composition.

According to the rule of constant proportion, the elements are always present in certain amounts to one another by mass in chemical compounds. For instance, regardless of how or where water is obtained, it always contains H2O, hydrogen, and oxygen in a mass ratio of 1:8, according to an example.

for sample A

mass Zn = 8.11g

mass of O =10-8.11=1.89g

Zn= 8.11/65 = 0.1

O= 1.89/16 =0.1

ratio is 1:1

compound = ZnO

for sample b

Zn= 10.70g

O= 13.2-10.7=2.5g

Zn= 10.70/65 =1

O= 2.5/16 =0.16=1

ratio = 1:1

compound= -ZnO

Therefore, it is shown that the figures illustrate the law of constant composition.

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The half-life of N₂O₅ at 70°C then it is 50s or 0.8min

Half life is the the interval of time required for one half of the atomic nuclei of a radioactive sample to decay

The first-order rate constant for the decomposition of N₂O₅ and reaction is

2N₂O₅(g) → 4NO₂(g)+O₂(g)

The half life is the time at which the concentration of  N₂O₅ is the half initial concentration that is [ N₂O₅ ] = 1/2 [ N₂O₅ ]₀

Using this same equation then

ln ([N₂O₅]) = -2kt + ln ([N₂O₅]₀)

We replace [ N₂O₅ ] by 1/2[ N₂O₅ ]₀ and solve for t

ln (1/2 [N₂O₅]₀) = -2kt + ln ([N₂O₅]₀) applying logarithmic property

ln 1/2 + ln([N₂O₅]₀) = -2kt + ln ([N₂O₅]₀)  solving for t and applying logarithmic property (ln 1/2 = ln 1 - ln 2 = 0 - ln 2 = - ln 2)

t = ln 2/2k

t = 50s or 0.8min

The half-life of N₂O₅ at 70°C then it is 50s or 0.8min

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When 0.900mol of octane is burned in air it reacts with oxygen Oxygen gas to produce carbon dioxide gas and water vapor, then 7.20mole of carbon dioxide is produced.

Combustion reaction is a reaction in which a substance, basically hydrocarbons burns in presence of oxygen to produce carbon dioxide and water.

The balanced reaction is

[tex]2C_{8} H_{18}+25O_{2} \rightarrow16CO_{2} +18H_{2}O[/tex]

The mole ratio of octane to carbon dioxide is 2:16 that is 1:8

2 mole of octane produce =16 mole of carbon dioxide

1 mole of octane produce = 8 mole of carbon dioxide

0.900mol of octane produce= 8× 0.900

                                                = 7.20mole

Thus the mole of carbon dioxide produced is 7.20mole.

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A risk-benefit analysis compares the risks and benefits of a situation and determines whether the advantages outweigh the disadvantages. 

Strengths

Risk-benefit analysis calculates the amount of time will be worth it to the production of technology and whether the technology will have a healthy impact on the industry or not.

Weaknesses

Risk-benefit analysis cannon determine product implementation and the outcomes of real life experiences of individual customers. It has some drawbacks like benefits of customer is take under consideration but pollution in nature is not calculated.

Implication

Risk-benefit analysis is implied in almost all technical industry as it the decision maker of any developing team to work on a particular project or not. Some examples are automobile industry and smartphone industry.

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The heat energy that is required to melt all the ice at temperature of 0° C is 7.28x10^5 cal.

What is heat energy?

Heat energy is created by the movement of tiny atoms, molecules, or ions in solids, liquids, and gases. It is possible to transfer heat energy from one thing to another. Heat is a flow or transfer that happens when two objects have different temperatures from one another.

We know that the initial temperature of the ice (T) is 0° C

Latent heat of ice is given in the question as 80.0 cal/g

The mass of ice given in question is 9.10 kg

So, the heat required to change the phase of the ice is given as:

[tex]Q=mL[/tex]

[tex]Q =(9.10 \times 10^3)(80)[/tex]

[tex]Q = 728 \times 10^3[/tex]

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Hello.  This is Mr. Biederman, your science teacher at Insight School of Michigan.  You are obviously one of my students.  Posting content here is against school policy.  Just ask me directly for help.  I am always happy to help with anything!

Answer

Explanation

Given:

2Al + 3Cl₂ 2AlCl₃

Molar mass of AlCl3 => 133 g/mol

Moles of Cl₂ = 25.0 mol

What to find:

The grams of aluminum chloride that can be produced.

Step-by-step solution:

Step 1: Determine the mole of AlCl₃ produced.

From the given chemical equation for the reaction,

3 mol Cl₂ produce 2 mol AlCl₃

So 25.0 mol Cl₂ will produce

16.67 moles of AlCl₃ produced.

Step 2: Calculated the grams of AlCl₃ produced.

Using the mole formula

Answer:

flammability, toxicity etc..

Explanation:

are chemical changes

The molar mass of unknown gas is 211.59 g/mol.

Since both the gases are present in identical experimental condition, using Grahams law of effusion:

      [tex]\frac{time req for unknown gas}{time of oxygen}[/tex] = [tex]\sqrt{\frac{Molar mass of unknown gas}{molar mass of Oxygen} }[/tex]

  Given:

Time of unknown gas = 72 sec

Time of Oxygen = 28 sec

we know the molar mass of oxygen = 32 g/mol

Now substituting:

    [tex]\frac{72 sec}{28 sec} = \sqrt{\frac{M.M of unknown}{32g/mol} }[/tex]

M.M of unknown = (72 / 28)² × 32 g/mol

                            = 211.59 g/mol

So the molar mass of unknown gas is 211.59 g/mol

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Uranium-238 is an unstable nuclide that emits an alpha particle, three neutrons, and

gamma particles and produces a daughter nuclide Thorium.

The atomic mass of alpha particle is 4g and atomic number 2. Since an alpha particle emits, so there is reduction in the atomic mass 4 and atomic number 2.

The atomic number of neutron is 0 and the atomic mass of neutron is 1. When three neutrons emit the atomic mass reduces to 3 while atomic number remains same.

Gamma particles have no mass and charge. So, atomic number and atomic mass remains same.

Total reduction in atomic mass : 238 - 4 - 3 = 231.

Total reduction in atomic number = 92- 2 = 90

Therefore, the daughter nuclide is Thorium.

Thus, we concluded that the Uranium-238 is an unstable nuclide that emits an alpha particle, three neutrons, and gamma particles and produces a daughter nuclide Thorium.

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• We are given that Lidocaine is available as 0.5%(w/v) , 0.5%(w/v) represents the amount of Lidocaine in grams per 100mL. so, 0.5% is the same as 0.5g of Lidocaine in 100ml.

• Since our solution has a volume of 6.0mL:

mass of Lidocaine = 6mL * (0.5g /100mL)

= 0.03g of Lidocaine in 6.0mLsolution.

This means that, in 6.0ml of this injection solution, we have 0.03g of Lidocaine .

The volume of NaOH required is 80ml.

Sulfuric acid is a dibasic acid and NaOH is monoacidic base.

M1V1 = M2V2

where, M1 = initial concentration,

V1 = initial volume,

M2 = concentration after mixing

V2 = total final volume.

This formula is used for calculating the final volume or molarity after mixing two solutions.

Given the question,

M1 = 0.505M

V1 =?

M2 = 0.505M

V2 = 40 ml

M1V1 = 2×M2V2

0.505 × V2 = 2 × 0.505 × 40

V2 = 2×0.505×40

            0.505

V2 = 80ml

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We can care for the pH meter electrode by;

1) Making sure that the electrode remains moist

2) The electrode should be stored in a 4M solution of KCl

3) Electrodes should not come in contact with deionized water.

The term pH has to do with the negative logarithm of the hydrogen ion concentration. Now we know that the pH of a solution tells us the amount of the hydrogen ions or the hydroxyl ions that is present in the solution. The pH mete is the instrument that we could use to be able to measure the pH of the solution.

The pH scale runs between 0 - 14. The points on the scale that have been labeled from 0 - 6 tells us that the solution is an acidic solution and contains more hydrogen ions.  If the solution has a pH of 7, then it is neutral and contains equal concentration of hydrogen and hydroxyl ions. A solution of pH 8 - 14 is basic and contains more hydroxyl than hydrogen ions.

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Answer:

b.Carbon has a total of four bonded pairs of electrons around it.

Answer:

4 PH₃ + 8 O₂ -----> P₄O₁₀ + 6 H₂O

Explanation:

An equation is balanced when there is an equal amount of each element on both sides of a chemical reaction. Remember, the reactants are the molecules that lie on the left of the reaction arrow and the products are the molecules that lie on the right.

The unbalanced equation:

PH₃ + O₂ -----> P₄O₁₀ + H₂O

Reactants: 1 phosphorus, 3 hydrogen, 2 oxygen

Products: 4 phosphorus, 2 hydrogen, 11 oxygen

As you can see, there is an unequal amount of each element. To balance the equation, we can add coefficients to change the quantity of particular molecules. By doing this, you subsequently change the amount of the elements.

The balanced equation:

4 PH₃ + 8 O₂ -----> P₄O₁₀ + 6 H₂O

Reactants: 4 phosphorus, 12 hydrogen, 16 oxygen

Products: 4 phosphorus, 12 hydrogen, 16 oxygen

****P₄O₁₀ technically has a coefficient of 1

The Lewis dot model of a molecule is shown as -

On the basis of this model, the statement which is true is Carbon has a total of four bonded pairs of electrons around it.

Formaldehyde, HCHO has two hydrogen atoms, one carbon atom and one oxygen atom. Oxygen and carbon has double bond between them. Carbon atom is located at the center in the lewis dot structure. Valence electrons in the outer shell of carbon is four. Four electrons of carbon are bonded as it is bonded with two hydrogen atoms and one oxygen atom and oxygen and carbon atom has double bond between them.  

Therefore, Carbon has total of four bonded pairs of electrons around it. Hence, this statement is true.

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ANSWER

Moles of water is 3.50 moles

EXPLANATION

Given that:

The mole of hydrogen gas is 3.50 moles

Firstly, write a balanced equation for the reaction

In the reaction, 2 moles of hydrogen will give you 2 moles of H2O

Since the number of moles of hydrogen given id 3.5 moles, then the number of moles of water.

In acetylene (H-C=C-H) three pairs of electrons are shared between two atoms of carbon forming a triple bond, while a single pair of electrons is shared between a carbon atom and a hydrogen atom.

With a negative one elementary charge electric charge, the electron is a subatomic particle. Given that they have no known components or substructure and are a member of the first generation of lepton particles, electrons are typically regarded as elementary particles.

Approximately 1/1836th of a proton's mass is that of an electron. An intrinsic half-integer value angular momentum (spin) with units of the reduced Planck constant,, is one of the electron's quantum mechanical properties.

The Pauli exclusion principle states that since electrons are fermions, they can never share the same quantum state. Electrons, like all elementary particles, have the ability to interact with other particles and behave like waves when they are diffracted, similar to how light does.

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The mass of the piece of porcelain is 27.3 oz.

1st) It is necessary to calculate the mass of the porcelain with the density formula:

2nd) Now it is necessary to convert the gram unit to oz. Here we need to use the relation that 1 g is equal to 0.035 oz:

So, the mass of the piece of porcelain is 27.3 oz.

Before Europe colonized the Americas indigenous peoples used controlled burning to alter the landscape. Controlled fires were part of the environmental cycles and wildlife habitat protection that underpinned the cultures and economies of the Native American peoples.

Before European invasion tribes used controlled burning to remove shrubs that acted as craters returning nutrients to the soil preventing overcrowding and excessive competition for nutrients and water and maintaining healthy forests pastures. and cleared grasslands for wildlife such as water buffalo Prevent forest fires.

For many indigenous peoples fire was an essential part of life. Native Americans Alaskan Natives and Native Hawaiians used fire to clear land for crops and travel to cultivate land for certain plant and animal species to hunt game and for many other important purposes. used. Indigenous peoples were able to survive many natural disasters because they learned to move quickly when a disaster struck an area.

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Atomic mass of zinc is 65. Simply dip one strip into the water for 3 seconds, remove it and shake once to remove excess water, wait 20 seconds for the color to develop, and compare it to the closest color match to determine your zinc concentration.

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