ITS DUE IN 12 MINUTES PLEASE HELP ME :((

Answer:

0.0820M H₃PO₄

Explanation:

THe phosphoric acid, H₃PO₄ reacts with sodium hydroxide, NaOH, thus:

H₃PO₄ + 3NaOH → Na₃PO₄ + 3H₂O

The moles of NaOH used to neutralize the acid are:

Moles NaOH:

20.8mL = 0.0208L * (0.532mol / L) = 0.0111 moles NaOH.

That means moles of phosphoric acid in the solutionare:

0.0111 moles NaOH * (1mole H₃PO₄ / 3 moles NaOH) =

0.00369 moles H₃PO₄

These moles are in 45.0mL = 0.045L. The molar concentration of the solution are:

0.00369 moles H₃PO₄ / 0.045L =

Answer:

1 mole

The first step is to calculate the molar mass (gram formula weight) of MgCl2. Molar mass = (24.31 + 2 × 35.45) = 95.21 g mol–1 i.e. 95.21 g of MgCl2 is exactly 1 mole

Answer:

[tex]Kp = \frac{P_{NH_{3}} ^{2} }{P_{N_{2}} ^{}P_{H_{2}} ^{3} }[/tex]

Explanation:

For the reaction at equilibrium:

N₂ (g) + 3 H₂(g) ⇄ 2 NH₃ (g)

Since this is an equilibrium in the gas phase, the equilibrium expression is obtained from the partial pressures (P) of the products (NH₃) and reactants (N₂ and H₂) raisen to their stoichiometric coefficients:

[tex]Kp = \frac{P_{NH_{3}} ^{2} }{P_{N_{2}} ^{}P_{H_{2}} ^{3} }[/tex]

Answer: This means that the isotope of silicon with a mass number of 28 is by far the most common of these three isotopes.

Explanation:

The abundance of Si-28 is 92.23%. Si-29 is 4.68% and Si-30 is 3.09%.

Answer:

X and Z

Explanation:

See attachment for complete question...

Your question illustrates kinetic energy as it relates to height (according to the attachment)

Kinetic energy increases with a decrease in height.

So, from the attachment...

W and Y are at higher heights.

While X and Z are at lowest heights

By the analysis above, kinetic energy would be at highest at X and then Z.

Hence, the answer to the question is X and Z.

Answer:

Why you use deonized water rather than tap water in this experiment? Because deonized water is pure and without contaminants that can affect the result of the experiment.

Explanation:

When using AgNO3 as the test anion, we used distilled or deionized water instead of tap water because deionized water is purer and free of contaminants that could affect the result of the experiment.

Distillation is the process which involves the conversion of a liquid into  water vapour and it condensed back to liquid form. It is the process in which separation of components of a mixture is based on different boiling points.

It is used to separate liquids from nonvolatile solids and also involve in the separation of alcoholic liquors from fermented materials or in the separation of two or more liquids having different boiling points, as in the separation of gasoline, kerosene, and lubricating oil from crude oil.

A plant that performs distillation is called a distillery while the apparatus used to perform distillation is called a still.

Thus, when using AgNO3 as the test anion, we used distilled or deionized water instead of tap water because deionized water is purer and free of contaminants that could affect the result of the experiment.

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Answer:

See full explanation.

Explanation:

Hello.

In this case, since we apply the law of mass action in order to write the equilibrium expression for each chemical reaction, we proceed as follows:

a. The reaction is:

[tex]2COF_2(g)\rightleftharpoons CO_2(g)+CF_4(g)[/tex]

And the equilibrium expression:

[tex]Kc=\frac{[CO_2][CF_4]}{[COF_2]^2}[/tex]

Since all the species are in gaseous phase they are included on the equilibrium expression.

b. The reaction is:

[tex]Cu(s)+Ag^+(aq)\rightleftharpoons Ag(s)+Cu^{2+}(aq)[/tex]

And the equilibrium expression:

[tex]Kc=\frac{Cu^{2+}}{Ag^+}[/tex]

Since only copper (II) ions and silver (I) ions are in aqueous phase.

c. The reaction is redox and it turns out:

[tex](S_2O_8)^{2-}+Fe^{2+}\rightleftharpoons Fe^{3+}+(SO_4)^{2-}\\\\S_2^{7+}+2e^-\rightarrow 2S^{6+}\\\\2\times (Fe^{2+}\rightarrow Fe^{3+}+1e^-)\\\\\\(S_2O_8)^{2-}(aq)+2Fe^{2+}(aq)\rightleftharpoons 2Fe^{3+}(aq)+2(SO_4)^{2-}(aq)[/tex]

And the equilibrium expression:

[tex]Kc=\frac{[Fe^{3+}]^2[(SO_4)^{2-}]^2}{[(S_2O_8)^{2-}][Fe^{2+}]^2}[/tex]

Since all the species are in aqueous phase.

Answer:

There are two properties that can be used to identify an element: the atomic number or the number of protons in an atom. The number of neutrons and number of electrons are frequently equal to the number of protons, but can vary depending on the atom in question.

Answer:

Empirical formula: C3H30

Molecular formula: C6H6O2

Explanation:

The empirical formula can be calculated thus:

65.45% C - 65.45g

5.45% H - 5.45g

29.09% O - 29.09g

We convert each mass to mole by dividing by their respective atomic mass:

C = 65.45/12 = 5.45mol

H = 5.45/1 = 5.45mol

O =29.09/16 = 1.82mol

Next, we divide each mole value by the smallest value;

C = 5.45mol/1.82 = 2.99

H = 5.45mol/1.82 = 2.99

O = 1.82mol/1.82 = 1

Approximately, the empirical ratio of C, H and O is 3:3:1 i.e. C3H3O

Molecular formula is calculated thus:

(C3H3O)n = 100g/mol

{12(3) + 1(3) + 16}n = 100

(36+3+16)n = 100

(55)n = 100

n = 100/55

n = 1.82

n = 2

Molecular formula= (C3H3O)2

C6H6O2

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The system here is chloroplast, so the boundary of the system would be cell cell membrane. Input will be nutrients, output waste and process photosynthesis

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Answer:

i feel like it will have an acid smell

The question is incomplete; the complete question is;

Identify the possible issues if a sample in a spectrophotometer gives no reading. Select one or more:

The wrong wavelength may be set.

The sample may be placed improperly in the cuvette holder.

There may be an issue with the composition of the sample.

There may be an issue with the spectrophotometer

Answer:

The wrong wavelength may be set.

There may be an issue with the spectrophotometer

Explanation:

Substances do not absorb radiation at all wavelengths. The proper wavelength at which a substance absorbs must be used for a reading to be obtained from the spectrophotometer. If this is not done, no reading is obtained from the spectrophotometer.

Generally, if the spectrophotometer has an issue, it may display no reading until the machine is fixed.

The possible issues if a sample in a spectrophotometer gives no reading are:

According to the given question, we are asked to identify the possible reasons why a spectrophotometer would give no reading when a sample is used on it.

As a result of this, it is important to note that it is possible that the sample may not have been placed correctly on the cuvette holder or the wrong wavelength may be set which would cause the no reading error to show.

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Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\ [/tex]

From the question

volume = final volume of water - initial volume of water

volume = 18.3 -15 = 3.3 mL

We have

[tex]density = \frac{33.65}{3.3} \\ = 10.19696969...[/tex]

We have the final answer as

Hope this helps you

Answer:

2.25E18

Explanation:

0.000045 g of Carbon x (1 mol C/ 12.01 g C) x (6.02 x 10E23 atoms / 1 mol C)

Start with the mass, then multiply it by the molar mass but put moles on the top and grams on the bottom to cancel out the grams. Then multiply it by Avogadros Constant to get atoms

Answer:

D. It's the only one with C6H14 on the reactant side.

Explanation:

Answer:

the apple changed color

Explanation:

cause when it changes to brown it means the apple is no longer edible

many fruits with just having contact with the air it may change color like apple

Answer:

Taking energy away from a gas cooling it down may cause it to turn into a liquid or condense

Answer:

sold,liquidator gas

Explanation:

pressure| practicelmodel of matter| siyavula

Answer:

Explanation:

From the given information:

We explained the reaction mechanism of 2,4-pentanedione with hydrazine to yield 3,5-dimethylpyrazole as shown below;

At the initial stage, the carbonyl oxygen gains a proton, increasing the carbonyl carbon's electrophilicity. After that, the carbonyl carbon is being attacked by hydrazine. Then, the process proceeds with the species formed where removal of a proton takes place. Similarly, hydroxyl oxygen gains a proton. After that, the water molecule is being removed, and further rearrangement of an electron occurs at the site of nitrogen in hydrazine.

From species formed, the removal of a proton takes place. Finally, all step is being repeated to yield the final product known as 3,5 - dimethylpyrazole.

Answer:

See explanation

Explanation:

Let us remember that the Iodide ion is a good nucleophile.  SN2 reaction is  promoted in a polar aprotic solvents like  acetone.

Aprotic solvents like acetone do not favor the formation of a carbocation hence the reaction of Sodium iodide in acetone with PhCH2Cl proceeds by SN2 mechanism. This is possible because the compound possesses a halogen atom(Cl) which is easily replaced by I^- from NaI. The corresponding NaCl formed is insoluble in acetone.

Similarly, when AgNO3/ethanol reacts with PhCH2Cl; ethanol which is a polar protic solvent and a poor nucleophile coordinates with the silver ion in the  PhCH2Cl and enhances carbocation formation (SN1 mechanism operates).

The SN2 mechanism is not followed here because there is no good nucleophile present compared to the situation in the reaction of PhCH2Cl with NaI/acetone.

Answer:yes,no,no,yes

Answer: 22.78KJ/ mol

Explanation:

The computation of activation energy [tex]E_0[/tex] follows by formula:

[tex]\ln (\dfrac{K_2}{K_1}) = (\dfrac{E_a }{ R}) (\dfrac{1}{T_1} -\dfrac{ 1}{T_2})[/tex]

Given:[tex]T_1 = 376.0^{\circ}C =376+273K= 649 K[/tex]

[tex]K_1 = 4.8 \times10^8[/tex]

[tex]T_2 = 280.0^{\circ}C = 273+280K=553 K ,\ \ \ K_2 = 2.3 \times 10^8[/tex]

[tex]\ln(\dfrac{2.3 \times10^8 }{ 4.8 \times 10^8}) = (\dfrac{E_a }{ 8.314}) (\dfrac{1}{649} - \dfrac{1}{553})\\\\\Rightarrow\ \ln(0.479) = (\dfrac{E_a }{ 8.314}) (-\dfrac{96}{358897})\\\\\Rightarrow\ -0.73605468= (\dfrac{E_a }{ 8.314}) (-\dfrac{96}{358897})\\\\\Rightarrow\E_a=-0.73605468\times 8.314\times\dfrac{-358897}{96}=22878.033\\\\\Rightarrow\E_a=22878.033\ J/mol=22.78 KJ /mol[/tex]

Hence, the activation energy for this reaction =22.78KJ/ mol

Answer:

e. None of these

Explanation:

The oxide of Bromine (BrₐOₓ) produce "a" moles of Br that are equal to "a" moles of AgBr. The moles of AgBr are:

Moles AgBr:

3.188g AgBr * (1mol / 187.78g) = 0.01698 moles of AgBr = Moles of Br

These moles of Br weighs (Molar mass: 79.9g/mol):

0.01698 moles of Br * (79.9g / mol) = 1.36g of Br

Mass of Oxygen must be:

1.90g - 1.36g Br = 0.54g oxygen. In moles:

0.54g O * (1mol / 16g) = 0.03375 moles of O

Empirical formula is the simplest ratio of atoms in the molecule. Dividing in the moles of Br:

Br:  0.01698 moles of Br / 0.01698 moles = 1

O: 0.03375 moles of O / 0.01698 moles = 1.99 ≅ 2

That means empirical formula is:

BrO₂

And right option is:

The empirical formula of the oxide would be [tex]BrO_2[/tex]

1.90 g of the oxide of bromine produces 3.188 g of AgBr

moles of 3.188 g AgBr = 3.188/187.78

                                        = 0.017 moles

AgBr ---> Ag+ + Br-

Thus, mole of Br in AgBr = 0.017 moles

Mass of 0.017 Br = mole x molar mass

                           = 0.017 x 79.904

                              = 1.357 g

Mass of oxygen in the oxide of bromine = 1.90 - 1.357

                                                                    = 0.543 g

mole of 0.543 oxygen = 0.543/16

                                       = 0.0339 moles

mole of 1.357 g Br = 0.017

Dividing by the smallest:

Br = 0.017/0.017 = 1

O = 0.0339/0.017 = 1.99

Empirical formula = BrO2

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Answer:

[OH⁻] = 4.0 × 10⁻⁹ M

Acidic

Explanation:

Step 1: Given data

Step 2: Calculate the concentration of OH⁻

We will use the following expression.

[H₃O⁺].[OH⁻] = Kw = 1.0 × 10⁻¹⁴

[OH⁻] = 1.0 × 10⁻¹⁴/[H₃O⁺] = 1.0 × 10⁻¹⁴/2.5 × 10⁻⁶ = 4.0 × 10⁻⁹ M

Step 3: Calculate the pH

We will use the following expression.

pH = -log [H₃O⁺] = -log 2.5 × 10⁻⁶ = 5.6

Since the pH < 7, the solution is acidic.

Answer:

Explanation:

abything that is both mass and volume

Answer:

anything that has both mass and volume

According to the Aufbau principle, the 4s orbital is filled first instead of the 3d orbital

Each electron shell and its orbitals have a specific energy level.

The farther the shell is from the atomic nucleus, the higher the energy level.

This energy level is expressed in the form of electron configurations.

Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub shell in the shell of an atom, namely s, p, d and f.

Charging electrons in the subshell uses the following sequence:

1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.

According to Aufbau, electrons occupy orbitals of the lowest energy level  

So the 4s orbital has a lower energy level than the 3d orbital, so the electrons fill the 4s orbital first

Answer:

Element is not present in an atom

Answer:

element

Explanation:

Answer:

[tex]2Ag^+(aq)+CO_3^{2-}(aq)\rightarrow Ag_2CO_3(s)[/tex]

Explanation:

Hello.

In this case, since the reaction is not given but a typical precipitation of silver from silver nitrate could be represented by its reaction with a soluble metallic sulfide or carbonate since silver carbonate and silver sulfide are insoluble, we can use for instance sodium carbonate to obtain:

[tex]2AgNO_3(aq)+Na_2CO_3(aq)\rightarrow Ag_2CO_3(s)+2NaNO_3(aq)[/tex]

Thus, since, silver nitrate, sodium carbonate and sodium nitrate are fully ionized by silver carbonate remains solid, the complete ionic equation is:

[tex]2Ag^+(aq)+2NO_3^-(aq)+2Na^+(aq)+CO_3^{2-}(aq)\rightarrow Ag_2CO_3(s)+2Na^+(aq)+2NO_3^-(aq)[/tex]

Then, since nitrate and sodium ions are the spectator ions since they are at both reactants and products, the net ionic equation turns out:

[tex]2Ag^+(aq)+CO_3^{2-}(aq)\rightarrow Ag_2CO_3(s)[/tex]

Best regards!

Answer:

0 mg

Explanation:

after 24 days all of it would be gone.

Phosphorus only has a 24 day life span.