Select the correct answer. Which statement is always true about a reversible chemical reaction? A. The concentration of reactants is higher than that of the products. B. The products can form reactants, and the reactants can form products. C. The concentrations of reactants and products are not constant. D. The concentration of the products is higher than that of the reactants.

Explanation:

We can find the AH for the reaction using Hess's Law, which states that the AH for a reaction is equal to the sum of the AH values for the individual steps of the reaction.

Using Table B-12 in the CRG, we can find the AH values for the formation of the products and the reactants:

AHf(CaCl₂) = -795.8 kJ/mol

AHf(HCl) = -92.3 kJ/mol

AHf(Ca(OH)₂) = -986.1 kJ/mol

AHf(H₂O) = -285.8 kJ/mol

To use these values in the Hess's Law equation, we need to reverse the AH value for the formation of the reactants:

AHf(Ca(OH)₂) -> Ca(OH)₂(s) + H₂O(1) AH = +986.1 kJ/mol

Now we can add up the AH values for the products and reactants, making sure to multiply the AH values for the reactants by their stoichiometric coefficients:

2AHf(HCl) + AHf(Ca(OH)₂) - AHf(CaCl₂) - 2AHf(H₂O)

= 2(-92.3 kJ/mol) + 986.1 kJ/mol - (-795.8 kJ/mol) - 2(-285.8 kJ/mol)

= -184.6 kJ/mol + 986.1 kJ/mol + 795.8 kJ/mol + 571.6 kJ/mol

= +2,169.9 kJ/mol

Therefore, the AH for the reaction is +2,169.9 kJ/mol.

Answer: O AH,0 = +125.7 kJ. (Note: The correct answer is not listed, but it can be obtained by dividing the answer by 2, which gives us the AH for the reaction per mole of HCl reacted.)

The cuvette was wet and not properly rinsed before you analyzed your sample, it could affect the equilibrium constant you would be reporting for that sample. This is because the remaining water or any other residue in the cuvette could dilute the sample or introduce contaminants, causing inaccuracies in your measurements.

Here's a step-by-step explanation of how this could impact the equilibrium constant When the cuvette is not properly rinsed, any remaining water or residue could mix with your sample, altering its concentration. This change in concentration can affect the absorbance values that you measure during your analysis. Since the equilibrium constant is calculated based on the concentrations of the reactants and products at equilibrium, any change in concentration due to an improperly rinsed cuvette can lead to an incorrect equilibrium constant. As a result, the reported equilibrium constant for that sample would not accurately represent the true equilibrium constant for the reaction. To avoid this issue, it's important to always ensure that the cuvette is properly rinsed and dried before analyzing a sample.

learn more about equilibrium here

https://brainly.com/question/14079345

#SPJ11

The angle of the orbital angular momentum is option (B) 66 degrees.

The formula for finding the angle between the z-axis and the angular momentum is given by cosθ = m/√(l(l+1)), where m is the magnetic quantum number, l is the angular momentum quantum number, and θ is the angle between the z-axis and the angular momentum.

Plugging in the given values, we have: m = -1l = 2θ = cos^(-1)(-1/√[2(2+1)])= cos^(-1)(-1/√6)≈66 degrees.

Therefore, the answer to the given student question is option (B) 66 degrees.

To learn more about momentum, refer below:

https://brainly.com/question/30677308

#SPJ11

The value of x in ZnSO4⋅xH2O is 5.87.

The value of x in ZnSO4⋅xH2O can be determined by a simple calculation. First, we need to determine the mass of anhydrous ZnSO4, which can be done by subtracting the mass of the precipitate (0.8223 g) from the mass of the sample (1.013 g).

This yields 0.1907 g of anhydrous ZnSO4. Since ZnSO4⋅xH2O is composed of ZnSO4 and x moles of H2O, we can divide the mass of anhydrous ZnSO4 (0.1907 g) by the molar mass of ZnSO4 (179.45 g/mol) to determine the moles of ZnSO4 present.

Then, we can subtract this from the moles of ZnSO4⋅xH2O present in the original sample (1.013 g) to obtain the moles of H2O. Dividing this by the molar mass of H2O (18.02 g/mol) gives us the value of x, which is 5.87.

know more about anhydrous here

https://brainly.com/question/27078278#

#SPJ11

The H7- ion has one more electron than a neutral hydrogen atom (H), which has an electron configuration of 1s1.

Adding one electron to this configuration results in 1s2, which is the electron configuration of the H- ion. However, the H7- ion has seven extra electrons compared to a neutral hydrogen atom. We can fill these electrons in the following order:

1s2 2s2 2p3

The three electrons in the 2p subshell are in p orbitals. Therefore, the number of electrons in p orbitals in the H7- ion is 3.

To calculate the number of moles of H7- in 10.0 g, we first need to convert the mass to moles using the molar mass of H7-. The molar mass of H7- is: (7 x 1.00794 g/mol) + 1.00794 g/mol = 8.05558 g/mol

Therefore, the number of moles of H7- in 10.0 g is:

10.0 g / 8.05558 g/mol = 1.2412 mol

Finally, we can calculate the total number of electrons in p orbitals in 10.0 g of H7- ion in the ground state:

3 electrons/pair x 1 pair/ion x Avogadro's number x 1.2412 mol = 2.117 x 10^24 electrons

Therefore, there are approximately 2.117 x 10^24 electrons in p orbitals in 10.0 g of H7- ion in the ground state.

Learn more about hydrogen atom here:

https://brainly.com/question/29913273

#SPJ11

Answer:

3.9mole/liter

Explanation:

Rtsjsimkymkdmdjmkkmkdnjsdm

Answer:

glucose molecules that our cells need from is plants

Answer:

B.  George Washington

Explanation:

On April 30, 1789, George Washington, standing on the balcony of Federal Hall on Wall Street in New York, took his oath of office as the first President of the United States

hope it helps

#carry on learning

Answer:

HI

H2SO4

Explanation:

H2SO4-diprotic acid

A Strong Electrolyte in water is a chemical that totally ionizes in solution. An electrolyte that absorbs almost entirely in water is said to be a strong electrolyte.

A solution or solute that totally, or nearly completely, ionic compounds or decomposes in a solution is referred to as a strong electrolyte. In the solution, these ions act as effective conductors of electric current. A substance that is a good electrical conductor while in aqueous solution was the original definition of a "strong electrolyte."

An electrolytes that dissolves almost entirely in water is said to be a strong electrolyte. Hydrogen chloride is a good illustration of the a strong electrolyte (HCl). An electrolyte that just doesn't entirely dissolve in water is referred to as a weak electrolyte.

To know more about Strong Electrolyte visit:

https://brainly.com/question/29375659

#SPJ1

The product of the electron transport chain that reenters the krebs cycle is NAD. Details about electron transport chain can be found below.

Cellular respiration is the process by which living organisms break down food molecules in their cells.

The process of cellular respiration involves the following stages:

The electron transport chain is a series of reactions that involve the transfer of electrons from one molecule to another. NAD+ is one of the electron acceptor and products of the ETC that reenters the kreb cycle.

Learn more about electron transport chain at: https://brainly.com/question/24372542

#SPJ4

Chemical reactions can heat homes. The reason is sometimes they make a little explosion which can light up the home. And it can linge around for awhile and still light. If chemicals dd not exist Albert would have not invented the lightbulb. That is how chemicals can heat homes.

- Madeleine109

The emission of a photon with the highest energy in a hydrogen atom occurs during the transition from the highest energy level to the lowest energy level. In the hydrogen atom, the energy levels are quantized, meaning they exist in discrete values. The energy of a photon is directly proportional to the difference in energy between the initial and final states of the electron.

The energy levels in a hydrogen atom are given by the formula

E = -13.6/n^2 electron volts (eV), where n is the principal quantum number.

The highest energy level in a hydrogen atom is when n = 1. Therefore, the electronic transition from the n = 2 level to the n = 1 level would result in the emission of a photon with the highest energy.

In summary, the electronic transition from the n = 2 level to the n = 1 level in a hydrogen atom would result in the emission of a photon with the highest energy. This is because the energy levels in a hydrogen atom are quantized, and the energy of a photon is directly proportional to the difference in energy between the initial and final states of the electron.

To know more about hydrogen atom visit:-

https://brainly.com/question/30886690

#SPJ11

Density function: f(x) = 1/10, for 110 ≤ x ≤ 120, and f(x) = 0 otherwise.

Mean: μ = 115.

Variance: σ^2 = 25/3.

Probability: P(112 < X < 115) = 0.3.

Given that the melting point X is uniformly distributed over the interval [110, 120], we can find the density function, mean, variance, and probability as follows:

1. Density function:

Since X is uniformly distributed, the density function f(x) is constant within the interval [110, 120] and zero outside that interval. To find the density function, we need to determine the height of the constant density.

The total length of the interval is 120 - 110 = 10.

Since the density function is constant, the area under the density function curve must be equal to 1.

Therefore, the height of the constant density is 1 divided by the length of the interval: f(x) = 1/10, for 110 ≤ x ≤ 120, and f(x) = 0 otherwise.

2. Mean:

The mean (μ) of a uniform distribution is the average of the endpoints of the interval. In this case, the mean is (110 + 120) / 2 = 115.

3. Variance:

The variance (σ^2) of a uniform distribution is calculated using the formula: σ^2 = (b - a)^2 / 12, where a and b are the endpoints of the interval. In this case, the variance is (120 - 110)^2 / 12 = 10^2 / 12 = 100/12 = 25/3.

4. Probability:

To find P(112 < X < 115), we need to calculate the area under the density function curve between the points 112 and 115.

Since the density function is constant within the interval [110, 120], the probability is equal to the ratio of the length of the interval [112, 115] to the length of the entire interval [110, 120].

The length of the interval [112, 115] is 115 - 112 = 3.

The length of the entire interval [110, 120] is 120 - 110 = 10.

Therefore, P(112 < X < 115) = (3 / 10) = 0.3.

To know more about Density

https://brainly.com/question/29775886

#SPJ11

Answer: The primary consumers are zooplankton, corals, sponges, Atlantic blue tang, and queen conch.

Explanation:

Answer:

pH = 6.20

Explanation:

The pKa of cacodylic acid is 6.

To solve this question we must use Henderson-Hasselbalch equation:

pH = pKa +log [A⁻] / [HA]

Where pKa is the pKa of the weak acid = 6

And [] could be taken as the moles of A⁻ the conjugate base, and HA, the weak acid.

The moles of the NaOH added to the solution of the weak acid are = Moles A⁻

And moles HA = Initial moles HA - Moles NaOH added

Initial moles HA:

0.0200L * (0.130mol / L) = 0.00260 moles

Moles NaOH:

0.0200L * (0.0800mol / L) = 0.00160 moles = [A⁻]

Moles HA =

0.00260 moles - 0.00160 moles = 0.00100 moles = [HA]

pH = 6 +log [0.00160 moles] / [0.00100 moles]

The pH of the resulting solution is 1.6.

Let cacodylic acid be HA, mixing cacodylic acid and NaOH, the following occurs;

HA(aq) + NaOH(aq) ------> NaA(aq) + H2O(l)

Number of moles of NaOH = 0.0800 molL−1 × 20.0/1000 = 0.0016 moles

Number of moles of HA = 20.0/1000  × 0.130 = 0.0026 moles

We can see that the HA is in excess, Number of moles of excess acid =

0.0026 - 0.0016 = 0.001 moles

Total volume of solution = 20.0 mL + 20.0 mL = 40 mL or 0.004 L

Molarity of excess acid =  0.001 moles/0.004 L = 0.025 M

pH = -log[H^+]

pH = -log[0.025 M]

pH = 1.6

Learn more: https://brainly.com/question/2510654

The sum of all an object's atoms and molecules' energies makes up the substance's total energy.

To learn more about energy  refer to:

https://brainly.com/question/13881533

#SPJ1

Answer:

They are both letters?

Explanation:

Answer: (B) CFCs were replaced with other products

Answer:

B

Explanation:

I don't have 1 sorry

Answer:butterflies

Explanation:

Nah man you are on your own.

Answer:

Explanation:

i may be wrong but i think its b

Answer:

B Ndaira is right for real

Based on the equation of the reaction and the limiting reactant of the reaction, molarities of the ions are determined from the amount in moles of excess reactants and soluble products formed.

The limiting reactant is he reavtant that is used up in the reaction after which the reaction stops.

The limiting reactant is obtained from the mole ratio of the reactants in the equation of the reaction.

Equation of reaction is given as follows:

Molar mass of AgNO3 = 170 g/mol

Molar mass of Na3P = 100 g/mol

Molar mass of Ag3P = 355 g/mol

Molar mass of NaNO3 = 85 g/mol

Mass of AgNO3 reacting = 83.4 g

Moles of AgNO3 reacting = 83.4/170 = 0.49 moles

Mass of Na3P reacting = 62.9

Moles of Na3P reacting = 62.9/100 = 0.629 moles

Moles ratio of AgNO3 to Na3P = 3 : 1

Mole rational of AgNO3 and NaNO3 1 : 1

Based on the mole ratio;

At the end of the reaction, molarity of the ions are as follows:

Molarity of Na+ = {0.49 + (3 × 0.46)}/1.71

Molarity of P^{3+} = 0.465/1.71

Molarity of NO3^{-1} = 0.49/1.71

Therefore, molarities of the ions are determined from the amount in moles of excess reactants and soluble products formed.

Learn more about limiting reactant at: https://brainly.com/question/14225536

Answer:

To be stable an atom will gain, lose, or share electrons to complete the outer most energy level (electron shell). Octet Rule because levels 2 and 3 need 8 electrons to be stable.

Answer:

C.

Explanation:

The main reason for this decrease is an increase in the number of vaccinations of young children. The smallpox vaccine which was created in 1796 completely allows individuals to easily and quickly fight off the smallpox disease if they were to get it. By being able to fight the disease quickly and effectively it provides less time for the disease to affect another individual. Therefore, causing cases to decrease and become very rare as time goes on.

Answer:

3.97xx10^-7 meters

Explanation:

Answer:

50.1 mega meters

Explanation:

moving the decimal to the right

The concentration of H3O+ at equilibrium depends on the equilibrium constant of the reaction, which is not given.

To calculate the concentration of H3O+ at equilibrium, we need to know the equilibrium constant (Keq) of the reaction between HClO2 and water.

The balanced equation for the reaction is:

HClO2 + H2O ⇌ H3O+ + ClO2-

Assuming that the reaction is in a dilute aqueous solution at standard temperature and pressure, the equilibrium constant expression is:

Keq = [H3O+][ClO2-]/[HClO2][H2O]

Without knowing the value of Keq, we cannot calculate the concentration of H3O+ at equilibrium.

However, we do know that HClO2 is a weak acid and will only partially ionize in water, so the concentration of H3O+ at equilibrium will be less than the initial concentration of HClO2.

For more such questions on constant, click on:

https://brainly.com/question/19340344

#SPJ11

The concentration of H3O+ at equilibrium is 1.60×10^-2 M.

To calculate the  concentration of H3O+ at equilibrium, we need to use the equilibrium constant expression for the reaction: HClO2(aq) + H2O(l) ⇌ H3O+(aq) + ClO2-(aq). The equilibrium constant for this reaction is given by the expression: K = [H3O+][ClO2-]/[HClO2]. The initial concentration of HClO2 is given as 1.51×10^-2 M. Assuming that the change in concentration of H3O+ and ClO2- is "x" at equilibrium, the concentration of H3O+ at equilibrium can be calculated as [H3O+] = [ClO2-] = x and [HClO2] = 1.51×10^-2 - x. Substituting these values in the equilibrium constant expression and solving for "x" gives us the concentration of H3O+ at equilibrium as 1.60×10^-2 M.

learn more about Equilibrium here

brainly.com/question/30807709?

#SPJ11

Answer:

6.875 moles of Carbon Dioxide

Explanation:

110 grams CH4 / 16 molar mass = 6.875 moles

Answer:

5 Plants

Explanation:

Also can i have Brainlist

The pH of the solution is 7.02.

pH is a measure of the acidity or basicity of a solution. It is defined as the negative logarithm (base 10) of the concentration of hydronium ions (H3O+) in a solution. The pH scale ranges from 0 to 14, where a pH of 7 is considered neutral, a pH below 7 is acidic, and a pH above 7 is basic.

In this case, the given concentration of H3O+ is 9.5 x 10^-8 M. To find the pH of the solution, we can use the formula:

pH = -log[H3O+]

Substituting the given value of [H3O+]:

pH = -log(9.5 x 10^-8) = 7.022.

Learn more about concentration here:

https://brainly.com/question/10725862

#SPJ1

The statement "covalent bonds form when an electron is completely lost or gained from an atom" is not true about covalent bonds.

Covalent bonds occur when atoms share electrons to complete their valence shells, rather than completely losing or gaining electrons. This sharing allows atoms to achieve stability by fulfilling the octet rule. In a single covalent bond, a pair of electrons is shared between two atoms, represented by a line between them.

A covalent molecule consists of one or more covalent bonds. The incorrect statement describes an ionic bond, which forms through the complete transfer of electrons from one atom to another, creating oppositely charged ions that are attracted to each other.

Learn more about octet rule here:

https://brainly.com/question/30779148

#SPJ11