In a reaction that produces carbon dioxide, the theoretical yield is 59 grams. During the experiment, the reaction actually produced 52.9 grams of carbon dioxide. Determine the percent yield.

Answer:

\(Kc=\frac{[HI]^2}{[I_2][H_2]}\)

Explanation:

Hello there!

In this case, for these equilibrium problems it is firstly necessary to know the balanced reaction at equilibrium:

H2((g) + I2(g) ⇋ 2HI(g)

Next, by means of the law of mass action, it turns out possible for us to write the required and correct expression for the equilibrium constant by considering the concentrations and the coefficients in the aforementioned reaction:

\(Kc=\frac{[HI]^2}{[I_2][H_2]}\)

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Answer:

its the 1st one at the top

Answer:

[Cu²⁺] = 2.01x10⁻²⁶

Explanation:

The equilibrium of Cu(CN)₄²⁻ is:

Cu²⁺ + 4CN⁻ ⇄ Cu(CN)₄²⁻

And Kf is defined as:

Kf = 1.0x10²⁵ = [Cu(CN)₄²⁻] / [Cu²⁺] [CN⁻]⁴

As Kf is too high you can assume all Cu²⁺ is converted in Cu(CN)₄²⁻ -Cu²⁺ is limiting reactant-, the new concentrations will be:

[Cu²⁺] = 0

[CN⁻] = 0.33M - 4×2.2x10⁻³ = 0.3212M

[Cu(CN)₄²⁻] = 2.2x10⁻³

Some [Cu²⁺] will be formed and equilibrium concentrations will be:

[Cu²⁺] = X

[CN⁻] = 0.3212M + 4X

[Cu(CN)₄²⁻] = 2.2x10⁻³ - X

Where X is reaction coordinate

Replacing in Kf equation:

1.0x10²⁵ = [2.2x10⁻³ - X] / [X] [0.3212M +4X]⁴

1.0x10²⁵ = [2.2x10⁻³ - X] / 0.0104858X + 0.524288 X² + 9.8304 X³ + 81.92 X⁴ + 256 X⁵

1.04858x10²³X + 5.24288x10²⁴ X² + 9.8304x10²⁵ X³ + 8.192x10²⁶ X⁴ + 2.56x10²⁷ X⁵ = 2.2x10⁻³ - X

1.04858x10²³X + 5.24288x10²⁴ X² + 9.8304x10²⁵ X³ + 8.192x10²⁶ X⁴ + 2.56x10²⁷ X⁵ - 2.2x10⁻³ = 0

Solving for X:

X = 2.01x10⁻²⁶

As

[Cu²⁺] = X

Answer

The correct statements are:

A. Elements are rarely in their pure form.

D. A chemical bond is a strong attractive force between atoms.

Explanation

Few elements can exist in their natural pure form, but many elements don't exist in their pure form in nature due to their chemical or atomic instability.

And because noble gases are reluctant to share electrons from their filled outer electron shells, noble gases are generally considered unreactive.

A full valence shell is the most stable electron configuration that has two (duplet) or eight (octet) valence electrons.

A chemical bond is a strong attractive force between atoms, ions or molecules that enables the formation of chemical compounds. The bond may result from the electrostatic force between oppositely charged ions as in ionic bonds or through the sharing of electrons as in covalent bonds.

Therefore the correct statements are:

A. Elements are rarely in their pure form.

D. A chemical bond is a strong attractive force between atoms.

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AgCl⇒ the precipitate

Given

Reaction

2AgNO₃+CaCl₂⇒2AgCl+Ca(NO₃)₂

Required

The precipitate

Solution

Solubility rules :

soluble compound  :

All compounds of NO₃⁻ and C₂H₃O₂⁻

Compounds of Cl−, Br−, I− except Ag⁺, Hg₂²⁺, Pb²⁺

So AgCl⇒ the precipitate

Ca(NO₃)₂⇒aqueous

The actual yield divided by the hypothetical yield multiplied by 100 is known as percent yield.  The percent yield is  68.04 %.

The percent yield is the difference between the actual yield and the hypothetical yield multiplied by 100.

A number of factors, which will be discussed in more detail in later chapters of the course, can cause a chemical reaction's actual yield to be lower than its theoretical yield.

The percentage yield of a chemical reaction indicates the efficiency of that reaction.

It provides us with information about the percentage of our reactants that successfully transformed into a product in terms of percentages.

\(Ca_5(PO_4)_3F + 5H_2SO_4 + 10H_2O $\rightarrow$ 3H_3PO_4 + 5CaSO_4.2H_2O + HF\)

 504.3 g                                                          294 g

 1 x 103 g                                                              ??

\((504.3 g ) Ca5(PO_4)_3F \rightarrow H_3PO_4 (294 g)\)

1000 g \(Ca5(PO_4)3F \rightarrow\)      ??

theoretical yield of H2PO4 = "\(1000\ \times \frac{294}{504.3}\)

                                        = 582.986 g

actual yield = 396 g

percent yield = \("\frac{396}{582}\times 100"\)

                   ="percent yield = 68.04 %"

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2. The pH is 4.22 × 10⁸. 3. pH is 7, 4. pOH is 9.7, 5. diprotic is explained below, 6. Amphoteric is explained below, 7. pH meter, 8. A buffer solution is explained below, 9. Titration is explained below, 10. Difference between strong and weak acids is explained below.

2. pH = -log[H⁺]

pH = -log(4.22 x 10⁻⁸)

pH ≈ 7.375

3. pH + pOH = 14

pH + 7 = 14

pH = 14 - 7

pH = 7

4. pH + pOH = 14

pOH = 14 - pH

pOH = 14 - 4.3

pOH ≈ 9.7

Now,

[H⁺] × [OH⁻] = 1.0 x 10⁻¹⁴

[OH⁻] = 1.0 x 10⁻¹⁴ / [H⁺]

[OH⁻] = 1.0 x 10¹⁴ / 10^(-pOH)

[OH⁻] = 1.0 x 10⁻¹⁴ / 10^(-9.7)

[OH⁻] ≈ 1.99 x 10⁻⁶ M

5. Being diprotic means that a molecule or ion can donate or release two protons (H⁺ ions) in an acid-base reaction.

6. Amphoteric refers to a substance that can act as both an acid and a base.

7. The pH can be measured using a pH meter or a pH indicator.

8. A buffer solution is a solution that can resist changes in pH when small amounts of acid or base are added to it.

9. Titration is a laboratory technique used to determine the concentration of a solution by reacting it with a solution of known concentration (titrant) of another substance.

10. A strong acid is an acid that completely ionizes in water, releasing all of its hydrogen ions. A weak acid is an acid that does not completely dissociate into ions when dissolved in water.

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Answer:

Polyethylene glycol

Explanation:

Because of the corrosive nature of Brine solution (solution of NaCl) , we can use organic liquid polyethylene glycol .  

Answer:

Mechanical

Explanation:

chemical

Explanation:

I took test 2020

Answer:

0.102 mol

Explanation:

Step 1: Write the balanced equation

PCl₅ + 4 H₂O ⇒ 5 HCl + H₃PO₄

Step 2: Calculate the moles corresponding to 7.36 g of H₂O

The molar mass of H₂O is 18.02 g/mol.

7.36 g × 1 mol/18.02 g = 0.408 mol

Step 3: Calculate the moles of PCl₅ required to react with 0.408 moles of H₂O

The molar ratio of PCl₅ to H₂O is 1:4.

0.408 mol H₂O × 1 mol PCl₅/4 mol H₂O = 0.102 mol PCl₅

The resolution of the monochromator is 3.6nm

A monochromator is an optical device that is used to isolate a specific wavelength or range of wavelengths of light from a broader spectrum of light. It is typically used in spectroscopy, where the goal is to measure the intensity of light at a specific wavelength or over a range of wavelengths.

The resolution of a monochromator, Δλeff, is given by the equation: Δλeff = (D^-1) * (exit slit width)

Plugging in the given values:

Δλeff = (1.8 nm/mm) * (500 micrometers)

Converting micrometers to millimeters:

Δλeff = (1.8 nm/mm) * (0.5 mm)

Δλeff = 3.6 nm

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Answer:

125.4 kilopascals

Explanation:

wkdje

Answer:

125,400 pa = 125.4 kPa

Explanation:

1 pa = 0.001 kPa

&

1 kPa = 1,000 pa

The final pressure of the gas is obtained as 4.80 atm.

We know that the root mean square speed of the gas would depend on the temperature of the molecules of the gas. Here we are told that the root mean square speed of the gas molecules is doubled and it means that the temperature was also doubled.

We have;

P1/T1 =P2/T2

2T1 = 2P1

The final pressure would  be 2(2.40)atm = 4.80 atm

Thus we ought to have the temperature at the end as 4.80 atm from the calculation that has been done.

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Answer:

The elements that are commonly positive ions are metals. But there are a few gases that can become positively charged by losing electrons.

Typically, when metals and non-metals interact, the metals' electrons are transferred to the non-metals. In contrast to non-metals, which form negatively charged ions, metals form positively charged ions.

The non-metal picks up electrons and gets negatively charged, whereas the metal loses electrons and gets positively charged. Cations and anions are the names given to positively and negatively charged ions, respectively.

Metals are the elements that lose electrons to generate positively charged ions (cations) in all chemical processes, with the exception of hydrogen. Metals are electropositive elements as a result.

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Answer:

moles reactant = 2, moles of products = 3

Explanation:

The reactants are on the left side of the equation. Although, energy (heat) is a reactant it will not factor into the calculation for moles. The coefficient is the number of moles for each substances. So for the reactant side NO would have 2 moles because the coefficient is 2. Using the same logic, NO on the product side will have 2 moles and O2 will be 1 mole. O2 has one mole because it is implied that you know anything multipled by one is the same number. So 1 mole of O2 is written as O2 and not 1 O2.

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Answer:

365 days

Explanation:

You've made a slight mistake. The sun doesn't go around the Earth, the Earth goes around the Sun. It takes 365 1/4 days to go around the Sun, but it is usually rounded to 365.

Considering the definition of empirical and molecular formula,  the molecular formula is P₇N₇O₁₄.

The empirical formula is the simplest expression to represent a chemical compound, which indicates the elements that are present and the minimum proportion in whole numbers that exist between its atoms, that is, the subscripts of chemical formulas are reduced to the most integers. small as possible.

The molecular formula is the chemical formula that indicates the number and type of different atoms present in the molecule. The molecular formula is the actual number of atoms that make up a molecule.

In other words, the molecular formula is the actual formula of the molecule and is made up of the symbols that represent the chemical elements and the subscripts that indicate the number of atoms of each element that participate in the formation of the molecule.

In this case, you know:

Assuming a 100 grams sample, the percentages match the grams in the sample. So you have 26.7 grams of P, 12.1 grams of N and 61.2 grams of Cl.

Then it is possible to calculate the number of moles of each atom in the molecule, taking into account the corresponding molar mass:

P: \(\frac{26.7 g}{31\frac{g}{mol} }\)= 0.86 moles

N: \(\frac{12.1 g}{14\frac{g}{mol} }\)= 0.86 moles

O: \(\frac{61.2 g}{35.45\frac{g}{mol} }\)= 1.72 moles

The empirical formula must be expressed using whole number relationships, for this the numbers of moles are divided by the smallest result of those obtained. In this case:

P: \(\frac{0.86 moles}{0.86 moles }\)= 1

N: \(\frac{0.86 moles}{0.86 moles }\)= 1

O: \(\frac{1.72 moles}{0.86 mole}\)= 2

Therefore the P: N: O mole ratio is 1: 1: 2

Then, the empirical formula is P₁N₁O₂= PNO₂, with a empirical mass of 31 g/mol + 14 g/mol + 2× 35.45 g/mol= 115.9 g/mol

The molecular formula can be calculated as MF= n(EF)

where:

In this case, the value n can be calculated:

n= 812 g/mol÷ 115.9 g/mol

Solving:

n= 7

Then, the molecular formula can be calculated as MF= 7×EF

Finally, the molecular formula is P₇N₇O₁₄.

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The atoms that are the same element are atoms 1 and 2, because they have the same number of protons (option D).

Element is one of the simplest chemical substances that cannot be decomposed in a chemical reaction or by any chemical means and made up of atoms all having the same number of protons.

The atoms of an element have the same number of protons, which is the atomic number.

According to the table given above, three atoms and their respective proton, electron and neutron number are given.

It can be said that atoms 1 and 2 are of the same element, because they have the same number of protons.

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Hydrogen bonding, which is unquestionably what we have, will occur from the intermolecular force between the molecules of H2O and CH3OH. Atoms trade or exchange valence electrons to create bonds.

Trust and self-esteem are developed in children and adolescents through strong emotional ties. After that, they can leave the family and establish wholesome friendships and other types of social ties. Healthy relationships consequently lower a child's chances of emotional discomfort or antisocial behaviour.

The government of a country issues government bonds, a sort of fixed-interest bond. These bonds are thought of as low-risk investments. Examples of different kinds of government bonds include T - bills, Municipality Bond, Zero-Coupon Bonds, and others.

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The mass by volume percentage is an important method which is used to calculate the concentration of a solution. This type of concentration is usually expressed as a percentage. Here the amount of solute is

The mass by volume percentage of a solution is defined as the ratio of the mass of solute that is present in a solution relative to the volume of the solution as a whole.

The equation used to calculate the mass by volume percentage is:

m / v = Mass of solute / Volume (mL) of solution × 100 %

m / v = 50 g / 75 mL + 25 mL = 0.5  × 100 % = 50%

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The volume of the gold plates in cm₃ is 2.513274 cm₃

Volume is the space occupied by a three-dimensional object“”

Volume = {mass} {density}

Given that the thickness or height of medallion, h = 2 mm = 0.2 cm

Diameter of the medallion, d = 4 cm

Radius of medallion, r = d/2 = 2 cm⁻³

The thickness of the gold plating, x = 1 μm = 10⁻⁴ cm

The density of gold = 19.3 g cm

Now we know that the shape of a medallion is cylindrical.

Hence, the volume of the medallion before platting,

Vbefore = π.r2.h = π.(2)2.0.2 = 2.513274 cm₃

Therefore, the volume of the gold-plated is 2.513274 cm₃.

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Answer:

The equation for incomplete combustion of propane is: 2 C3H8 + 9 O2 → 4 CO2 + 2 CO + 8 H2O + Heat. If not enough oxygen is present for complete combustion, incomplete combustion occurs. The result of incomplete combustion is, once again, water vapour, carbon dioxide and heat. But it also produces carbon monoxide.

Answer:c 3 mol of Ba(OH)₂ and 1 mol of Ba₃N₂ should be interchanged

i think

Explanation:

Ba₃N₂ + 6H₂O → 3Ba(OH)₂ + 2NH₃

n/mol:                                      9.2

They want to find moles of Ba₃N₂, so that should be in the numerator of the conversion factor,

Moles of Ba(OH)₂ should be in the denominator to cancel the units in 9.2 mol Ba(OH)₂,

The claim that paraffin wax would float in ethanol (d = 789 kg/L) is accurate.

A 40–50% aqueous solution would have a density that could be adjusted to be just below that of paraffin wax, while regular alcohol (ethanol) has a density of roughly 0.8. The wax would then begin to sink. Warming causes the wax's density to significantly decrease (more than ethanol does), causing it to float.

Even with your lungs completely expanded, you cannot float in 80-proof (or 40%) alcohol since your body weighs more than the booze and will sink if you stop swimming.

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Solar panels were invented by Charles Fritts, Daryl Chapin, Calvin Fuller, and Gerald Pearson.Solar panels were invented to produce clen and cheap energy from solar energy.

Solar panels are devices which are designed to trap the energy of sunlight or solar energy and store it in the form of chemical energy in inverters which is then converted to electrical energy.

In 1883, the American inventor Charles Fritts designed the first solar cells from selenium. Other subsequent inventors who improved on the design are Daryl Chapin, Calvin Fuller, and Gerald Pearson.

Solar panels were invented to produce energy used in homes and industries from solar energy.

Solar panels are used to generate electrical energy used in homes and industries today.

In conclusion, solar panels produce an alternative from of clean and cheap energy from the sun.

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