How many moles are found in 10.5 g of Pb?

Taking into account the definition of wavelength, frecuency and propagation speed, the wavelength of light with a frequency of 2.04×10¹⁵ Hz is 147.06 nm.

The wavelength is the minimum distance between two successive points of the wave from which the wave repeats itself.It is expressed in units of length (m).

Frequency is the number of vibrations that occur in a unit of time. Its unit is s⁻¹ or hertz (Hz).

The propagation speed of a wave can be measured as the time that elapses between when it is emitted and when it is received. In other words, the speed of propagation of a wave is the magnitude that measures the speed at which the disturbance of the wave propagates along its displacement.

The propagation speed relate the wavelength (λ) and the frequency (f) inversely proportional using the following equation:

v = f×λ

All electromagnetic waves propagate in a vacuum at a constant speed of 3×10⁸ m/s, the speed of light.

In this case, you know:

Replacing in the definition of propagation speed:

3×10⁸ m/s= 2.04×10¹⁵ Hz× λ

Solving:

λ= 3×10⁸ m/s ÷ 2.04×10¹⁵ Hz

λ= 1.4706×10⁻⁷ m= 147.06 nm (being 10⁻⁹ m= 1 nm)

In summary, the wavelength of the wave is 147.06 nm.

Learn more about wavelength, frecuency and propagation speed:

brainly.com/question/14377915

brainly.com/question/13151728

#SPJ4

The relationship  between the density (d) of a gas and the rate at which the gas diffuses is r = k/√d.

option B.

Graham's law of diffusion, also known as Graham's law of effusion, states that the rate of diffusion or effusion of a gas is inversely proportional to the square root of its gas density.

In other words, lighter gases diffuse or effuse faster than heavier gases at the same temperature and pressure.

Mathematically, this law is written as;

r ∝ 1/√d

r = k/√d

where;

Learn more about gas diffusion here: https://brainly.com/question/94094

#SPJ1

we would need 2625.13 grams (or 2.62513 kilograms) of NaCl.

To calculate the mass of NaCl required to produce a 26.4 mol/L solution with a 1.7 L volume, we need to use the formula that relates the mass of solute, moles of solute, and molarity:Molarity (M) = moles of solute / liters of solution Rearranging this formula, we get:moles of solute = Molarity (M) x liters of solutionWe can use this formula to find the moles of NaCl needed:moles of NaCl = 26.4 mol/L x 1.7 L = 44.88 molNow, we can use the molar mass of NaCl to convert from moles to grams. The molar mass of NaCl is 58.44 g/mol:mass of NaCl = moles of NaCl x molar mass of NaClmass of NaCl = 44.88 mol x 58.44 g/mol = 2625.13 gTo produce a 26.4 mol/L solution with a 1.7 L volume.

for more question on NaCl

https://brainly.com/question/23269908

#SPJ8

Answer:

copper

Explanation:

First, write down the reaction and notice the ratio of moles of which the reactants react.

the equation (i'm too lazy to write states of matter and since it doesnt matter in this problem i'm not going to. it is balanced, however) is:
Cl2 + Cu -> CuCl2

as you can see, one mole of chlorine gas reacts with one mole of copper.

since we have 75 moles of copper but only 70 moles of chlorine gas, after everything has been reacted we would expect 5 moles of copper to be left over. so, copper is the the reactant which is in excess

1.73/2 approximately 0.86 moles of acetic acid must be added. KOAc should be used at a ratio of 3/2, or 1.5 moles.

Effects on People Acetic acid is a potent irritant to the skin, upper respiratory tract, eyes, and mucous membranes when inhaled as vapor. Sodium acetate mixtures of 80% or over can be corrosive when in contact with skin or eyes, severely burning any exposed tissue.

Using the Henderson-Hasselbalch equation, determine the quantity of acetic acid (x) required to produce a pH-5.0 solution that contains

3MK+(3 M KOAc). The pK of acetic acid is 4.76 (Table 2-4).

\($$\begin{aligned}\mathrm{pH} & =\mathrm{p} K+\log \frac{[\mathrm{KOAc}]}{[\mathrm{HOAc}]} \\5 & =4.76+\log \frac{3}{x} \\0.24 & =\log 3-\log x \\0.24-0.48 & =-\log x \\0.24 & =\log x \\x & =1.73 \mathrm{M}\end{aligned}$$\)

Therefore, for a 500 mL solution, the amount of acetic acid added should be 1.73/2 or 0.86 moles. The amount of KOAc should be 3/2 or 1.5 moles.

To know more about acetic acid visit:

https://brainly.com/question/15202177

#SPJ4

The relationship between KMT and sea level rise is 760 nm as the sea level rises because the gas level is increasing.

KMT is described as the behavior of gases and also it is used to explain the macroscopic properties of a gas such as pressure and temperature.

Sea level rise is an increase in the level of the world oceans due to the effects of global warming and burning fossil fuels is one of the causes of global warming because it releases carbon dioxide and other heat-trapped gasses into the atmosphere.

So, the relationship between kinetic molecular theory (KMT) and sea level rise is the distance between sea level and KMT which is 760nm as the sea level is rising because the gas level is increasing.

To learn more about KMT and sea level rise, visit: https://brainly.com/question/507944

#SPJ1

Answer:

14.9 mol

Explanation:

To find the number of moles in a given mass of a sample of sodium chloride (NaCl), we can multiply the number of grams in the sample by the molar mass of sodium chloride, which is 58.44 g/mol.

871 g × (1 mol / 58.44 g)

= 871/58.44 mol

≈ 14.9 mol

Note that we rounded to 3 significant figures in the final answer because that is how many significant figures were given in the mass measurement of the sodium chloride sample.

The volume occupied by one mole of any gas is the same at the same temperature and pressure. This volume is the molar volume of the gas.

The molar volume of an ideal gas at STP is very important with regard to stoichiometric calculations. The molar volume of any gas at STP is 22.414 L or 22414 mL.

a. Number of moles of O₂ = 4.0 / 22.414 = 0.178

b. Number of molecules = Number of moles × 6.022 × 10²³

0.178 × 6.022 × 10²³ = 1.071 × 10²³

c. Mass of O₂ gas = 0.178 × 31.9 = 5.67 g

To know more about STP, visit;

https://brainly.com/question/2783971

#SPJ1

Answer:

Cats are eazy to take care for and relatively affordable

Answer:

cats r better cuz there cats ovi

Explanation:

there small, easy to take care of, and the are good with kids depending on the breed.

A voltaic cell is used to produce electrical energy with the help of chemical reactions.

Relating to, or producing direct electric current by chemical action.

A Voltaic Cell (also known as a Galvanic Cell) is an electrochemical cell that uses spontaneous redox reactions to generate electricity. It consists of two separate half-cells.

Learn more about voltaic cells here:

https://brainly.com/question/861659

#SPJ1

The amount, in kJ, of heat needed to completely vaporize 50.0g of water at 100°C is 118.8 kJ.

The heat needed to completely vaporize 50.0g of water at 100°C can be calculated using the following formula:

q = m x Hv

where:

First, we need to convert 50.0g to moles by dividing by the molar mass of water which is approximately 18.015 g/mol3:

moles of water = 50.0 g / 18.015 g/mol moles of water = 2.776 mol

Thus:

q = (2.776 mol) x (40.65 kJ/mol) q = 112.8 kJ

In other words, 112.8 kJ of heat is needed to completely vaporize 50.0g of water at 100°C.

More on heat of vaporization can be found here: https://brainly.com/question/12625048

#SPJ1

(NH4)3PO4 is insoluble in water. The correct option is D

According to their chemical formula and ionic charges, ionic compounds generally follow a set of solubility laws that define their solubility patterns in water. These guidelines aid in determining whether an ionic compound will dissolve in water or not as well as if it will precipitate when combined with other ionic compounds.

Therefore, (NH4)3PO4 is the compound that is expected to be insoluble in water based on the solubility rules.

Learn more about solubility rules here : brainly.com/question/15596863

#SPJ1

The most suitable choice is "likely" to convey the doubt or uncertainty regarding the boss's willingness to agree. Option B)

Based on the given context, the word that best fits the sentence is "likely."

The sentence implies that the speaker doubts the boss's willingness to agree with something. In this case, "likely" expresses the probability or possibility of the boss agreeing. It suggests that the boss is not expected to be receptive or open to the idea.

"Probable" implies a higher degree of certainty or likelihood, which may not be suitable in this context since the sentence indicates skepticism about the boss's agreement.

"Suitable" means appropriate or fitting, but it does not convey the sense of agreement or willingness.

"Talkative" refers to someone who is inclined to talk a lot, which is unrelated to the boss's agreement.

Therefore, the most suitable choice is "likely" to convey the doubt or uncertainty regarding the boss's willingness to agree. Hence option B) is correct.

For more question on choice

https://brainly.com/question/29886197

#SPJ8

4.933 mL of sulfuric acid needs to be added to have an acetanilide concentration of 1.5 M for the given molarity .

The molarity of a solution is defined as the total number of moles of solute present per litre. It is also referred to as "molar concentration" and is spelled "molar." It is denoted by the symbol "M," and its unit of measurement is mol/L. A solution is said to have one molarity if one mole of solute dissolves in one litre of solution. The molarity of a solution is determined by its volume but not by the volume of the solvent. Unlike mass, the molarity of a given solution relies on the physical properties of the system, such as pressure and temperature, because the volume of the solution changes as the physical conditions of the system change.

Use formula M₁ × V₁ = M₂ × V₂

To know more about Molarity , visit ;

brainly.com/question/8732513

#SPJ1

To get the reaction started in the given simulation where initially no reaction occurs between zinc (Zn) and copper (II) sulfate (CuSO4), a process called activation energy must be overcome.

Activation energy refers to the minimum energy required for a chemical reaction to occur. In the case of the reaction between zinc and copper (II) sulfate, there are a few possible methods to initiate the reaction and overcome the activation energy barrier:

1. Heat: Applying heat to the system increases the kinetic energy of the reactant particles, causing them to move more rapidly. This increased energy enables more collisions between the zinc and copper (II) sulfate reactant particles, causing them to move more rapidly. This increased energy enables more collisions between the zinc and copper (II) sulfate particles, increasing the chances of successful collisions and the likelihood of the reaction occurring.

2. Catalysis: A catalyst is a substance that lowers the activation energy of a reaction without itself being consumed in the process. Adding a suitable catalyst to the system provides an alternative reaction pathway with a lower activation energy, making it easier for the reactants to transform into products. In the case of the zinc-copper (II) sulfate reaction, certain catalysts like platinum or copper wire can facilitate the reaction.

3. Mechanical agitation: Stirring or shaking the reaction mixture increases the contact between the reactant particles, enhancing the frequency of collisions. This promotes the chances of effective collisions and increases the likelihood of successful reactions.

By implementing any of these methods, the activation energy barrier can be surmounted, allowing the zinc and copper (II) sulfate to initiate the reaction and proceed towards the formation of zinc sulfate (\(ZnSO_{4}\)) and copper. Once the reaction begins, it can continue on its own as long as there are sufficient reactants and the reaction conditions remain favorable.

Know more about activation energy here:

https://brainly.com/question/5280701

#SPJ8

Answer:

Has definite shape and volume

Solids have high melting point

Explanation:

Answer:B

Explanation:B can be reversed.

Answer:

Explanation:

Physical properties are characteristics of matter not associated with a change in chemical composition. Identity of the molecules do not change. A physical change is a change in state without changing the composition (e.g., melting wax, freezing water, grinding solids into powders).  Examples: density, color, melting and boiling points, evaporation, odor, taste, hardness, conductivity.

B. Honey dissolving in tea would be a physical change. The honey is not changing chemically but physically as it dissolves in the hot tea.

Explanation:

none because they can not be mixed together

A distillation column is a process unit in which a feed mixture is separated by multiple partial vaporizations.

It should be noted that distillation simply means a process that has to do with the conversion of liquid into vapor.

In this case, distillation column is a process unit in which a feed mixture is separated by multiple partial vaporizations.

Learn more about distillation on:

brainly.com/question/24553469

#SPJ6

An example of heterogeneous equilibrium is:

Heterogeneous equilibrium refers to an equilibrium state in a chemical reaction where the reactants and products exist in different physical states or phases. It occurs when substances in different phases, such as solids, liquids, and gases, are involved in a chemical reaction.

Considering the given equations:

The equation I: FeO(s) + CO(g) ⇌ Fe(s) + CO₂(g) represents a heterogeneous equilibrium.

This is because the reactants and products involve different phases (solid and gas). FeO is a solid (s), CO is a gas (g), Fe is a solid (s), and CO₂ is a gas (g). The reaction involves the conversion of a solid and a gas to another solid and a gas, and the equilibrium is established between these different phases.

Learn more about heterogenous equilibrium at: https://brainly.com/question/25257772

#SPJ1

The statement that is true about the effect of human activity on atmospheric carbon dioxide is Human activity has added carbon dioxide to the atmosphere.

Human activities, such as burning fossil fuels (coal, oil, and natural gas) for energy, deforestation, and industrial processes, have significantly increased the concentration of carbon dioxide in the Earth's atmosphere.

These activities release carbon dioxide that was previously stored in long-term reservoirs, such as fossil fuels and forests, into the atmosphere. This additional carbon dioxide contributes to the greenhouse effect and is a major driver of anthropogenic climate change.

The other statements mentioned are not accurate:

Human activity does not convert carbon dioxide in the atmosphere to other compounds on a large scale. There may be certain localized processes or technologies that aim to capture and convert carbon dioxide, but they are not widespread enough to significantly impact the overall levels of atmospheric carbon dioxide.

Human activity does not consume carbon dioxide in the atmosphere. In fact, human activities release carbon dioxide into the atmosphere through various processes, as mentioned above.

Human activity does not disrupt the carbon cycle by preventing it from reaching the atmosphere. The carbon cycle involves the movement of carbon between the atmosphere, oceans, land, and living organisms.

While human activities can impact the carbon cycle through land-use changes and deforestation, the overall effect is an increase in atmospheric carbon dioxide levels rather than preventing carbon dioxide from reaching the atmosphere.

Know more about  Human activity    here:

https://brainly.com/question/31742327

#SPJ8

Answer:Polonium

Explanation:

Answer:

Oxygen = 15.999 g/mol

Iron = 3 × 55.845 = 167.535 g/mol

CaCO3 = 20 × 100.0869 = 2001.738 g/mol

Answer:

Hello, Im Mack. Hope you're doing well. :)

Here is my Correct, custom answer for the lab Question, (I also took the same assignment and got a 100% score)

Explanation:

The heating of the sodium acetate solution made it change from super-saturated to un-saturated. Yet now that it cooled back to room temperature Im sure it is saturated. it wasn't able to disolve the excess sodium acetate left over at room temperature and had to be heated so now that it is back to room temperature I Think it will not disolve the sodium acetate left in the solution until it is heated again.    

Hope this helped you out,

Please feel free to comment for further help, and I'll reply asap.

Have a great day my friend :)

69 grams of CO2 will produce in the combustion of octane where CO2 and Water is produced.

Combustion is defined as the chemical reaction between substances  including oxygen. The reaction is accompanied by the generation of heat and light in the form of flame. The products CO2 and H2O forms when octane is burned. The process of combustion cannot take place in an atmosphere devoid of oxygen. The main ingredient of combustion is oxygen. The balanced chemical equation for combustion of octane is,

    2C8H18 + 25O2 ----> 16CO2 + 18H2O

The molar mass of C8H18 = 114 g/mole

The molar mass of CO2 = 44 g/mole

The mass ratio of C8H18/CO2 is 2* 114 / (16 * 44)

22.4 g of octane generates, 69 gram of CO2.

To learn more about Combustion please visit:

https://brainly.com/question/29671504

#SPJ4

Answer:

dude this this ain't the ans of this question but the 1 u asked me in the comments and I m not able to find that question so this is that questions answer ok

Answer:

fe9ufeohdwbkdwsdjvdwihdwkbfw

Answer: Light, Chemical

Explanation: This is the answer because "photosynthesis takes place in two stages: the light-dependent reactions and the Calvin cycle. In the light-dependent reactions, which take place at the thylakoid membrane, chlorophyll absorbs energy from sunlight and then converts it into chemical energy with the use of water." - source https://opentextbc.ca/

In the photosynthesis the energy starts as Light energy and ends up as Chemical Energy. Hence option (D) is correct

The process by that inexperienced plants and a few different organisms use daylight to synthesize nutrients from carbonic acid gas and water. chemical action in plants usually involves the inexperienced pigment and generates element as a by-product.

Photosynthesis may be a method employed by plants and different organisms to convert lightweight energy into energy that, through internal respiration, will later be discharged to fuel the organism's activities.

photosynthesis takes place in 2 stages: the light-dependent reactions and also the Calvin cycle. within the light-dependent reactions, that manifest itself at the thylakoid membrane, pigment absorbs energy from daylight and so converts it into energy with the employment of water.

Therefore, In the photosynthesis the energy starts as Light energy and ends up as Chemical Energy. Hence option (D) is correct

Learn more about Photosynthesis here ;

https://brainly.com/question/1388366

#SPJ2

Ethyl propanoate is an organic compound that is a member of a family of organic compounds known as esters.

a. The Lewis electron dot diagram for ethyl propanoate is as follows:

H  H    H

|    |     |

C-C-C-O-C

|    |     |

H  CH3-CH2-

b. Each oxygen atom in ethyl propanoate has a hybridization of sp3. The lone pairs of electrons on each oxygen atom occupy two of the hybridized orbitals, while the other two hybridized orbitals form sigma bonds with the carbon and hydrogen atoms.

Yo know more about Esters , visit :

https://brainly.com/question/10840252

#SPJ1