What mass of P4 is needed to completely react with 47.61 L of fluorine gas at STP?

P4 (s) + 6F2 (g) → 4PF3 (g)

1. 43.88 g P4

2. 7.935 g P4

3. 10.97 g P4

4. 263.3 g P4

The solution with the greatest buffering capacity is 0.543 M NH₃ and 0.555 M NH₄Cl since it has the highest concentrations of both NH₃ and NH₄+. option (a).

The buffer capacity is determined by the concentrations of both the weak acid and its conjugate base. The higher the concentrations of these species, the greater the buffering capacity. Thus, the solution with the greatest buffering capacity is option (a) 0.543 M NH₃ and 0.555 M NH₄Cl since it has the highest concentrations of both NH₃ and NH₄+.

A conjugate base is the particle formed when an acid loses a proton. It carries a negative charge and is capable of accepting a proton to reform the original acid. It is related to the acid through the transfer of a single proton.

Buffering capacity refers to the ability of a buffer solution to resist changes in pH upon addition of an acid or a base, by neutralizing them through the buffer components.

To learn more about buffering capacity refer here:

https://brainly.com/question/24188850#

#SPJ11

Explanation

Given:

Mass of copper = 5.07 g

Density of copper = 8.96 g/mL = 8960 g/L

Requested: Volume of copper

Solution

p = m/V where p is the density, m is the mass and V is the volume

m = p x V

V = m/p

V = 5.07 g/8.96 g/mL

V = 0.566 mL

Answer

Volume of copper = 0.566 mL

Answer:

Molecules do't break up and reform when a substance boils and cools. Particles stay the same size and shape during state changes.

Explanation:

brainliest will be appreciated

1) List known values.

sample: 0.600 mol

Pressure: 1.0 atm

Temperature: 15ºC

Constant: 0.082057 L⋅atm⋅K−1⋅mol−1

List unknown values

Volume:

2) Set the equation and solve for V.

3) Converting to proper units.

15ºC + 273.15 = 288.15 K

4) Plug in known values.

n: 0.600 mol

R: 0.082057 L⋅atm⋅K−1⋅mol−1

T: 288.15 K

P: 1.0 atm

The sample will occupy a volume of 14.19 L.

Answer:

A chemical compound.

For example...

\(C + H2 + O1 = Cx(H2O)y(carbohydrate)\)

Hope this helps! Have an awesome day! ♣

Answer:

According to google, "About five million million hydrogen atoms could fit. Some factors would affect that number like the area of the head and the size of atoms (as well as attractions between atoms). Some atoms are larger than others." Is this accurate? I'm not sure. Good luck! :)

The formula unit of compound made up from Pb4+ and oxygen is PbO2.

The formula unit for a compound made from Pb⁴⁺ and oxygen is PbO₂. Therefore, option (1) is correct.

A formula unit represents the lowest whole number ratio of ions in an ionic compound. The formula mass of a substance is the sum of the atomic masses of the ions present in the formula unit of an ionic compound.

Formula unit is the empirical formula of any covalent or ionic solid compound which is used as an independent entity for stoichiometric calculations. Formula mass is also defined as the sum of atomic masses of constituent atoms in an ionic compound.

A molecule is made up of two or more elements that are covalently bonded. Also, the molecular mass gives the mass of a molecule relative to that of a carbon twelve atom which has a mass of twelve units.

As we know the valency of lead is 4 and the valency of oxygen is 2. To satisfy the valency of each other two oxygen combine with one lead (IV). Therefore, the formula unit of the compound is PbO₂.

Learn more about formula unit, here:

https://brainly.com/question/15971114

#SPJ2

Answer:

thermal, I'm not 100% sure though.

Answer: I believe the answer is B. Sorry if i'm wrong

Explanation:

A longitudinal wave is one in which the particles of a medium are moved in an orientation parallel to the path of energy transmission.

A longitudinal wave may be formed in a slinky by stretching it horizontally and vibrating the end coil back and forth in a motion that is horizontal.

There is a centre line where what the medium would lie if there was no wave, which is commonly referred to as the undisturbed state. The movement of the medium above this disturbed location is referred to as a crest, whereas the displacement below this undisturbed position is referred to as a trough.

learn more about longitudinal wave

https://brainly.com/question/14364881

#SPJ1

The general properties of matter result from its relationship with mass and space. ... Because it occupies space, all matter has volume and impenetrability, since two objects cannot occupy the same space simultaneously.

Answer:

19.3

Explanation:

V=4^3 a^3,  to find volume with sides

p= 1235/64, Mass/ Volume= Density

Kilocalorie is a unit of measuring the amount of energy of a reaction, but this is not the only unit, we can also have Joules as a unit, and the conversion is:

1 Kcal = 4184 Joules

Therefore if we have 3.25 Kcal, we will have:

3.25 * 4184 = 13600 Joules of energy, therefore letter D

Answer:

H₃P phosphidic acid

Explanation:

The Trihydrogen monophosphide, as stated in the exercise, can act as an acid. This is pretty similar to the case of hydrogen chloride, which is a gas but it can also be an acid, in this case, chloridic acid.

In the case of trihydrogen phosphide, we can write it molecular formula which is:

H₃P

Now, this is a binary compound because its composed of only two elements, in this case, hydrogen and phosphide. To name binary acid, we need to name the non metal with the sufije idic, and then, the word acid.

Following this simple rule, the trihydrogen phosphide would be, as acid:

H₃P: phosphidic acid

Hope this helps

Br- + 2MnO4- + 2H+ → BrO3- + 2MnO2 + H2O

Given

MnO4- + Br- = MnO2 + BrO3-

Required

The half-reaction

Solution

In acidic conditions :

1. Add the coefficient

2. Equalization O atoms (add H₂O) on the O-deficient side.  

3. Equalization H atoms (add H⁺ ) on the H -deficient side.  .  

4. Equalization of charge (add electrons (e) )

5. Equalizing the number of electrons and then adding the two half -reactions together

Oxidation : Br- → BrO3-  

Reduction : MnO4- → MnO2

Br- + 3H2O → BrO3-  

MnO4- → MnO2 + 2H2O

Br- + 3H2O → BrO3- + 6H+  

MnO4- + 4H+ → MnO2 + 2H2O

Br- + 3H2O → BrO3- + 6H+ + 6e-         x1

MnO4- + 4H+ + 3e- → MnO2 + 2H2O x2

Br- + 3H2O → BrO3- + 6H+ + 6e-  

2MnO4- + 8H+ + 6e- → 2MnO2 + 4H2O

Br- + 2MnO4- + 3H2O + 8H+ + 6e- → BrO3- + 2MnO2 + 6H+ + 4H2O + 6e-

Br- + 2MnO4- + 2H+ → BrO3- + 2MnO2 + H2O

The dissociation constants for the acids A, B and C are 10⁻³, 10^9.6 and 10² respectively. The strongest acid is Acid C.

The dissociation constants for the given acids are given as:pKa

a = 3.0Ka

a = 10⁻³

pKa b = 9.60Ka

b = 10^-9.60pKa

c = -2.0Ka

c = 10²

The strongest acid is the one with the highest Ka value which is Acid C. The reason being, higher the value of Ka (Dissociation constant), higher is the dissociation of the acid. And as we can see, Acid C has the highest dissociation constant value or the highest Ka value of 10².

The expression of the dissociation constant for any acid is given as:

Ka = [H+][A-]/[HA]where,

[H+]= the concentration of the hydrogen ions

[A-]= the concentration of the anions

[HA]= the concentration of the undissociated acid

Dissociation of acids can be measured by calculating its acid dissociation constant (Ka).

Ka is the measure of the strength of an acid. It is used to show how readily an acid gives up a hydrogen ion (H+) when dissolved in water.

In this case, we have calculated the dissociation constants for the acids which are as follows:

Ka a = 10⁻³

Ka b = 10^9.6

Ka c = 10²

Therefore, the order of strength of the acids is: Acid C > Acid A > Acid B

Learn more about dissociation constants-

brainly.com/question/28187564

#SPJ11

The mass of the cell wall, assuming the cell is spherical and the wall is a thin spherical shell, is approximately 0.91 milligrams.

To calculate the mass of the cell wall, we first need to determine the volume of the wall.

The given diameter of the cell is 0.00 μm, which means the radius (r) of the cell is half of that, so r = 0.00/2 = 0.00 μm = 0.00 nm.Now, we need to find the volume of the cell wall, which can be approximated as a thin spherical shell. The volume of a thin spherical shell can be calculated using the formula:

V = 4/3 * π * (r_outer^3 - r_inner^3)

Since the cell is spherical, the inner radius of the shell is the same as the radius of the cell (r), and the outer radius of the shell is the sum of the radius of the cell (r) and the thickness of the wall (60.0 nm). Thus, the outer radius (r_outer) of the shell is:

r_outer = r + thickness = 0.00 + 60.0 = 60.0 nm

Substituting the values into the formula, we have:

V = 4/3 * π * (60.0^3 - 0.00^3)

= 4/3 * π * (216,000 nm^3)

= 288,000 π nm^3

Next, we need to calculate the mass of the cell wall using the density of pure water. The density (ρ) is given as 1000 kg/m^3, which is equivalent to 1000 kg/1,000,000,000 nm^3 since 1 m = 1,000,000,000 nm. Thus, the mass (m) of the cell wall is:

m = ρ * V

= 1000 kg/1,000,000,000 nm^3 * 288,000 π nm^3

= 0.000288 π kg

Now, we can calculate the mass of the cell wall by substituting the value of π (pi) as 3.14159:

m = 0.000288 * 3.14159 kg

= 0.000905 kg

≈ 0.91 mg

For more such questions on mass visit:

https://brainly.com/question/24191825

#SPJ8

Explanation:

Simple cell has liquid chemicals and it is difficult to carry from one place to another. Dry cell has no solution. So, it is easier to carry it from one place to another and there is no risk of spilling acid from the dry cell.

Answer:

the answer is b beacuse the substance changed

All of the following are characteristics of a Wittig  chemical reaction except it involves an SN² reaction between a carbanion and an aldehyde or ketone.

Chemical reactions are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.

There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.It involves SN¹ or SN²reactions.

Learn more about chemical reaction,here:

https://brainly.com/question/29762834

#SPJ4

UV-visible spectroscopy  used to measure the concentration of the molecules in a dilute solution. The part of the molecule that can absorb uv-visible light is called as chromophores.

UV-visible spectroscopy  used to measure the concentration of the molecules in a dilute solution. The part of the molecule that can absorb uv-visible light is called as chromophores. The absorption of the UV - visible radiation in the organic molecules is restricted for some molecules that contains the valence electrons of low energy.

The chromophore is the region in the molecule in which the difference in the energy between the two molecular orbitals comes in the range of the visible spectrum.

To learn more about spectroscopy here

https://brainly.com/question/29461520

#SPJ4

The necessary voltage to power the electrolysis of molten sodium chloride is 4V.

Electrolysis is the breakdown of a compound into the elements it is formed from by passing electricity through it. It is actually a chemical reaction in which one element loses electrons and the other may gain electrons. The process of electrolysis has wide applications in electroplating, metallurgical processes, production of chlorine gas, etc.

Molten sodium chloride is generally used in the production of chlorine gas and sodium metal. This molten or aqueous form of sodium chloride is also known as brine. The process is carried out in a cell called the Down's cell.

To know more about electrolysis, here

brainly.com/question/12054569

#SPJ4

The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.

The electrochemical cell is the cell that is capable of generating the electrical energy from the chemical reactions or by the use of the electrical energy to cause the chemical reaction. The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.  

There are the two types of the electrochemical cells is as follows : the galvanic called the electrolytic cells. the galvanic cell is also called as the voltaic cell.

To learn more about temperature here

https://brainly.com/question/14995282

#SPJ4

Answer:

a: 6 moles

b: 6.75 moles

c: 5 grams

Explanation:

a: mole ratio 2:3

b: mole ratio 2:3

c: mole ratio 2:2

The net charge on a molecule of a particular amino acid will be 1- when the pH is higher than the pI (isoelectric point) of the amino acid. In this case, the pI is 7.5, so the net charge will be 1- at a pH higher than 7.5.

The net charge on a molecule of an amino acid depends on the pH of the solution it is in. Amino acids have both acidic and basic functional groups, such as the amino group (-NH2) and the carboxyl group (-COOH). These functional groups can ionize, meaning they can either donate or accept protons depending on the pH of the solution.

The isoelectric point (pI) of an amino acid is the pH at which the net charge on the molecule is zero. At this pH, the number of positive charges (from protonated amino groups) is equal to the number of negative charges (from deprotonated carboxyl groups).

In this case, the pI of the amino acid is 7.5. Since the desired net charge is 1-, the pH must be higher than the pI. At a pH higher than 7.5, the amino acid will have a net negative charge because the carboxyl group will be deprotonated (COO-) while the amino group will remain protonated (NH3+). This results in a net charge of 1- on the molecule.

To learn more about isoelectric refer:

https://brainly.com/question/32069636

#SPJ11

When investigating whether or not the substance dibromoethane (ethylene dibromide) is carcinogenic, we follow the survival history of 161 white employees of 2 factories who were exposed to dibromoethane.

Among them, we observe 7 cancer deaths in the period 1940-1975. On the other hand, the mean number of cases over that period in that general population is expected to be 5.8. Do those 7 cases provide a reason to consider the substance as .Yes, the seven cases provide a reason to consider the substance dibromoethane as carcinogenic.

Since the number of cancer deaths observed in the 161 white employees exposed to dibromoethane is 7 which is greater than the expected cancer deaths in the general population, which is 5.8. Therefore, the excess cases may suggest that dibromoethane has some carcinogenic potential.

Hence, we can consider dibromoethane as carcinogenic.

To know more about carcinogenic visit:

https://brainly.com/question/30763696

#SPJ11