Why does the author include information about bread and sandwich wrappings in the article?
(A) to show that the scientific method is often used to understand things about food
(B) to provide an example of something that can be tested by the scientific method
(C) to demonstrate the problems that can be caused by improper seals and wrappings
(D) to help evaluate how the weight of bread can show how much moisture it has

Yes, \(Br^{-}\) and \(Cl^{-}\) ions both can be positively identified through  precipitation reaction or precipitimetry.

Through titration employing precipitation reaction or precipitimetry, these two ions can both be positively identified. When exposed to Cl- and Br- ions, AgNO3 transforms into silver halides. AgNO3 with Cl- ions precipitates white because AgCl is not particularly soluble in water, whereas AgNO3 with Br- ions precipitates cream.

A very light cream precipitate results from mixing cream and white ppt.

Both halides react as described below:

\(AgNO_{3}+ XCl\)\(= AgCl_{whiteppt.}\)

\(AgNO_{3}+ XBr\) \(= AgBr_{creamppt.}\)

Now, While AgBr does not dissolve in diluted ammonia, this AgCl precipitate does to create an Ag-diammonium ion combination. Two facts, including the fact that the ppt shade is now darker than the prior pale cream, demonstrate this. As a result of the addition of an ammonia solution, it becomes less concentrated, although some cream precipitates persist.

Second, concentrated ammonia dissolves the AgBr precipitate. AgBr precipitates dissolve when cream precipitate is filtered and concentrated ammonia is added. In solution Br- ions are confirmed by this.

\(Ag^{+}+NH_{3}\) ⇄ \((AgNH_{3} )_{2} ^{+}\)

The foregoing reaction switches in the right direction after the addition of diluted ammonia solution, and more and more Ag+ ions are complexed, producing the soluble form of Ag-diammonium complex.

Brown globules are produced when CHCl3 is added to the mixture and agitated.

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Mass of ethanol that has a volume of 75.0 mL is 591 g

Ethanol is used in the manufacture of drugs, plastics, lacquers, polishes, plasticizers, and cosmetics

Here given data is

Volume = 75.0 mL

Density = 789kg/m³

We have to calculate mass of ethanol = ?

So the formula is density = mass/volume

Mass = volume × density

Mass = 75.0 mL×789kg/m³

Mass = 591 g

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STP (Standard Temperature and Pressure):

At STP, 1 mole of an ideal gas will occupy a volume of 22.4 liters (Note: the new defined STP volume is 22.7 liters).

The volume is 77 L .

3 moles of oxygen at STP will occupy a volume of 3×22. 4=67. 2 L.

1.5 moles of oxygen at stp = 22.4 x 1.5 = 33.6 litres.

Therefore , number of moles of oxygen is : Now , we know volume of 1 mole of gas at S.T.P is 22.4 liters . Therefore , volume of 0.1 mole of oxygen at S.T.P is : Therefore , the volume of 3.2 gram atom of oxygen at S.T.P is 2.24 liters .

Helium is the largest, so that’s going to have the largest volume. Because at STP, volume was going to be equivalent to moles of gas.

Therefore, chemists introduced the concept of molar volume. Molar volume of a gas is defined as the volume of one mole of the gas. Thus, the molar volume is also the volume occupied by 6.02 x 1023 particles of gas. The molar volume of any gas is 22.4 dm3 mol–1 at STP or 24 dm3 mol–1 at room conditions.

oxygen gas

One mole of oxygen gas occupies 22.4 l volume at STP.

67.2 liters

The answer depends on the temperature and pressure. If the gas is at STP, THE 1 mole is 22.4 liters. 3 moles x 22.4 L/mol = 67.2 liters.

Well, assuming that the hydrogen gas is contained at STP , then the molar volume would be 22.7⋅3=68.1 L .

0.5 moles⋅22.4 L/mol=11.2 L , and so on.

The molar volume of any gas at S.T.P. is 22.4L .

So, the volume of an ideal gas is 22.41 L/mol at STP. This, 22.4 L, is probably the most remembered and least useful number in chemistry.

At STP, one mol of Ideal Gas occupies 22.4 L and one mmol of Ideal Gas occupies 22.4 mL.

Answer:According to the Darwin’s theory “ the survival of the fittest” , any organism would survive through the process of natural selection by  adapting itself  to the changing environment in order to become the fittest among all of its native species.  

Thus, in order to survive even after some major environmental changes, an organism is required to adapt to the new conditions.  

Hence, option 2 is the correct answer which talks about adaptation as per the changing environmental condition

Explanation:

The limiting reactant is oxygen.

To determine the limiting reactant, we need to compare the amount of product that each reactant can produce.

The balanced chemical equation for the combustion of ethene (C2H4) with oxygen (O2) is:

C2H4 + 3O2 → 2CO2 + 2H2O

From the equation, we can see that 1 mole of ethene reacts with 3 moles of oxygen to produce 2 moles of carbon dioxide and 2 moles of water.

Let's first calculate the number of moles of each reactant:

Number of moles of C2H4 = 34.1 g / (28.05 g/mol) = 1.215 moles

Number of moles of O2 = 28.8 g / (32 g/mol) = 0.9 moles

Next, we need to determine which reactant is limiting. To do this, we compare the moles of each reactant to the stoichiometric ratio in the balanced chemical equation.

For ethene:

1.215 moles C2H4 x (3 moles O2 / 1 mole C2H4) = 3.645 moles O2 required

For oxygen:

0.9 moles O2 x (1 mole C2H4 / 3 moles O2) = 0.3 moles C2H4 required

We can see that the amount of oxygen available (0.9 moles) is less than the amount required (3.645 moles) according to the stoichiometric ratio. Therefore, oxygen is the limiting reactant.

In conclusion, the limiting reactant is oxygen.

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The gas thermal energy changed by the value of plus 60 joules at constant 400 kpa pressure a gas is compressed from 600 cm3 to 200 cm3.

Calculate the work done as follows: W =-PAV

=-(400×10³ Pa)(200×10m³ - 600×10m³)

= +160 J

Here, positive sign indicates work is done on the gas.

Calculate the thermal energy as follows:

AU=Q+W

=-100+160 J

= +60 J

Here, the sign of Q is negative because heat is removed from the gas.

The system and environment can exchange energy with each other. One of the ways to exchange energy is doing work that can be understood in mechanical terms.

According to the Newton’s third law, the work done on the system by the environment and the work done by the system on the environment differ by the sign. In the general formulation of thermodynamics, we consider the former.

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The mechanism of glyceraldehyde 3-phosphate dehydrogenase in glycolysis  does not include phosphorylation of the substrate using ATP. Hence, option a is false.

Glyceraldehyde 3-phosphate dehydrogenase, or GAPDH, is an enzyme with a molecular mass of approximately  37 kDa that catalyzes glycolysis' sixth stage, converting glucose into energy and carbon molecules.

Initially, the carbonyl group of GAP is attacked by a cysteine residue in the active site of GAPDH, resulting in the formation of a hemithioacetal intermediate (covalent intermediate).

At the active site of the enzyme, a histidine residue deprotonates the hemithioacetal . In the ensuing thioester intermediate, deprotonation promotes the reformation of the carbonyl group and the ejection of a hydride ion. Not any step include the use of ATP. Thus, option a is false.

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Your question is incomplete. But, your complete question probably was:

The mechanism of glyceraldehyde-3-phosphate dehydrogenase does NOT involve. true or false?

A phosphorylation of the substrate using ATP.

B oxidation and phosphorylation of the substrate.

C a covalent intermediate.

D an active site histidine to serve as a proton acceptor.

Answer:

The answer is Gain 6 electrons.

Explanation: The reason for this is that for electrons to be stable, you need a valence shell of 8 electrons. Since it is arranged 2, 8, 2 , the outer shell is 6 less than 8 meaning it needs to gain 6 electrons.

Answer:

Ca  loose 2e

Al loose 3e

S gain 2e

P gain 3e

Na lose 1e

Cl lose 1e

Explanation:

Answer:

Below:

Explanation:

The electrons of the atoms of an element are located in specific energy levels, and only certain energy changes are possible when the electrons move back to the ground state from higher energy levels.

Hope it helps..

It's Ms-Muska

Answer:

I just love the killua pfp

I think b

Answer:

c

Explanation:

because it forces and help it

According to percent solution, the concentration expressed in volume/volume % of the solute is 286 ml.

Percent solution is defined as a convenient way to record concentration of solution.It is a expression which relates solute to solvent as,mass of solute/mass of solution ×100.There are two types of percentage solutions percent weight by volume and percent volume by volume .Advantages of using percent solutions is that molecular weight of compound is not required.

Substitution of values in formula gives,42.9/215×100=286 ml.

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Answer: 19.9%

Explanation:

To calculate the cell potential for the given reaction at 25°C with [CO2] = 0.24 and [Al3+] = 0.92, we need more information about the specific redox reaction taking place, including the half-reactions and their standard electrode potentials (E°). we need to use the Nernst equation, which relates the cell potential to the concentrations of the reactants and products in the electrochemical cell. The Nernst equation is given by:

Ecell = E°cell - (RT/nF) * ln(Q)

where Ecell is the cell potential, E°cell is the standard cell potential, R is the gas constant (8.314 J/K*mol), T is the temperature in Kelvin (298 K for 25 degrees Celsius), n is the number of electrons transferred in the reaction (in this case, n=3 because 3 electrons are transferred from Al to CO2), F is Faraday's constant (96,485 C/mol), and Q is the reaction quotient, which is the ratio of the product concentrations to the reactant concentrations raised to their stoichiometric coefficients.

The balanced chemical equation for the reaction is:

3CO2 + 4Al + 12H2O -> 4Al(OH)3 + 3H2CO3

The standard cell potential for this reaction can be found using a table of standard reduction potentials, which gives the reduction potentials for half-reactions at standard conditions (1 M concentration, 1 atm pressure, and 25 degrees Celsius). The standard cell potential is the difference between the reduction potentials of the two half-reactions, multiplied by their stoichiometric coefficients. The half-reactions for this reaction are:

Al3+ + 3e- -> Al(s)      E°red = -1.662 V
CO2 + H2O + 2e- -> H2CO3 + OH-    E°red = 0.198 V

The standard cell potential is therefore:

E°cell = (4*-1.662 V) - (3*0.198 V) = -7.146 V

Now we can use the Nernst equation to calculate the cell potential at non-standard conditions. The reaction quotient Q can be calculated using the concentrations of the reactants and products at the given conditions:

Q = ([Al3+] / 1)^4 * ([H2CO3] / [CO2]^3 * [OH-]^2)^3

Since the reaction involves water, we can assume that the OH- concentration is equal to the H+ concentration, which can be found from the dissociation constant for carbonic acid:

K1 = [H+][HCO3-] / [H2CO3] = 4.5 x 10^-7 at 25 degrees Celsius

[H+] = K1 * [H2CO3] / [HCO3-] = 2.4 x 10^-4 M

[HCO3-] = [CO2] / 0.92 = 0.261 M

[H2CO3] = [CO2] - [HCO3-] = 0.24 - 0.261 = -0.021 M (this value is negative because the amount of H2CO3 formed is less than the amount of CO2 consumed)

Substituting these values into Q, we get:

Q = (0.92 / 1)^4 * (-0.021 / 0.24^3 * 2.4 x 10^-4)^3 = 3.39 x 10^-31

Finally, we can substitute all the values into the Nernst equation and solve for Ecell:

Ecell = -7.146 V - (8.314 J/K*mol / 3*96,485 C/mol) * ln(3.39 x 10^-31) = -7.146 V

Therefore, the cell potential for the given reaction at 25 degrees Celsius is -7.146 V. This is a very large negative value, indicating that the reaction is highly unfavorable and will not occur under these conditions. Note that the concentrations given in the question are not realistic for this reaction, as the CO2 concentration is much higher than what is typically found in aqueous solutions, and the Al3+ concentration is much lower than what is needed to form Al(OH)3 precipitate.

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Answer:

It is a single replacement (SR) reaction also known as displacement reaction

Explanation:

Here, we want to write the equation of reaction for the single replacement of magnesium and cadmium (II) nitrate

Magnesium ion is higher up than cadmium (ii) ion in the electrochemical series. What this means is that it can displace it from its salt

We have the equation of reaction in words as:

Using their symbols, we have the equation above as:

High-quality scientific research is characterized by several key criteria. Three examples of such criteria include: rigorous experimental design and methodology, reliable data analysis and interpretation, and clear and transparent reporting of results.

These criteria ensure that research is conducted in a systematic and reliable manner, leading to trustworthy and valid findings.

Rigorous Experimental Design and Methodology: High-quality scientific research requires a well-designed experimental approach. This involves careful planning, proper control groups, randomization, and replication. A rigorous methodology ensures that experiments are conducted under controlled conditions, minimizing bias and confounding variables, and allowing for accurate and reliable data collection.

Reliable Data Analysis and Interpretation: After data collection, high-quality research involves thorough and appropriate analysis of the data. This includes using appropriate statistical methods to evaluate the significance of the results and drawing valid conclusions. Proper data analysis helps researchers identify patterns, trends, and relationships, supporting or refuting their hypotheses in an objective and reliable manner.

Clear and Transparent Reporting of Results: High-quality research demands transparent reporting of the methods, procedures, and findings. This includes providing detailed descriptions of the experimental setup, data collection processes, and statistical analyses used. Clear reporting allows other researchers to replicate the study and verify its results. Additionally, complete reporting ensures that readers can understand the research methodology and draw their own conclusions based on the evidence presented.

By adhering to these criteria, high-quality scientific research maintains integrity, credibility, and reproducibility. It fosters trust among the scientific community and facilitates the advancement of knowledge by building upon reliable foundations.

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The correct answer is [b] calcium is the metal that is produced by electrolysis of its molten chloride salt.

Metals are the opaque, lustrous elements that are good conductors of heat and electricity. Most metals are malleable and ductile and are, in general, denser than other elemental substances

Any of various opaque, fusible, ductile, and typically lustrous substances that are the good conductors of electricity and heat, form cations by loss of electrons, and yield basic oxides and hydroxides especially :the one that is a chemical element as distinguished from an alloy.

A metal may be a chemical element such as iron; an alloy such as stainless steel; or molecular compound such as polymeric sulfur nitride.

In physics, a metal is generally regarded as any substance capable of conducting the electricity at a temperature of absolute zero. Many elements and compounds that are not normally classified as metals become metallic under the high pressures.

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The amount of excess acetic anhydride is:Amount of excess acetic anhydride = initial amount - amount used = 0.0196 mol - 0.0145 mol = 0.0051 molTherefore, 0.0051 mol of acetic anhydride is used in the reaction.

The balanced chemical equation for the reaction of salicylic acid with acetic anhydride is given as follows: 2C7H6O3 + C4H6O3 ⟶ 2C9H8O4 + H2OIn this equation, salicylic acid (C7H6O3) is the limiting reagent and acetic anhydride (C4H6O3) is the excess reagent. The stoichiometric ratio between salicylic acid and acetic anhydride is 2:1. This means that for every two moles of salicylic acid, one mole of acetic anhydride is required. To find out how much of the excess reactant is used when the reaction is complete, we need to determine the limiting reagent and the excess reagent. We can do this by calculating the amount of product that each reactant can produce and comparing the values.Let's first calculate the number of moles of each reactant:No. of moles of salicylic acid = mass/molar mass = 2/138 = 0.0145 molNo. of moles of acetic anhydride = mass/molar mass = 2/102 = 0.0196 molTo determine the limiting reagent, we need to calculate the amount of product that each reactant can produce.

According to the balanced equation, 2 moles of salicylic acid produces 2 moles of aspirin, while 1 mole of acetic anhydride produces 2 moles of aspirin. Therefore, the amount of aspirin that can be produced from each reactant is as follows : Amount of aspirin produced from salicylic acid = 2 x 0.0145 mol = 0.0290 molAmount of aspirin produced from acetic anhydride = 2 x 0.0196 mol = 0.0392 molSince salicylic acid can produce only 0.0290 mol of aspirin, it is the limiting reagent. This means that acetic anhydride is in excess. To determine how much of the excess reactant is used, we need to subtract the amount of acetic anhydride used from the amount that was initially present. The amount of acetic anhydride used is equal to the amount of salicylic acid used, which is 0.0145 mol.

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Answer:

16.6 g of Al are produced in the reaction of 82.4 g of AlCl₃

Explanation:

Let's see the decomposition reaction:

2AlCl₃ →  2Al  + 3Cl₂

2 moles of aluminum chloride decompose to 2 moles of solid Al and 3 moles of chlorine gas.

We determine the moles of salt:

82.4 g . 1mol/ 133.34g = 0.618 moles

Ratio is 2:2. 2 moles of salt, can produce 2 moles of Al

Then, 0.618 moles of salt must produce 0.618 moles of Al.

Let's convert the moles to mass → 0.618 mol . 26.98g /mol = 16.6 g

Answer: E= 4.085 x 10^-19 J ; Wavelength= 4.862 x 10^-7 m

Explanation:

Sorry for the messy work, but I hope this helps.

Remember:

Plancks constant (h)=  6.626x10^-34 Js

Speed of light (c) = 2.998 x 10^8 ms^-1

What I did:

I found the energy first with the given frequency. Don't forget to convert your units to s^-1! They are actually the same, you dont need to do math for that conversion, just a simple Hz to s^-1.

For the wavelength, I multiplied plancks constant (h) and speed of light (c) together. With that number I divided by the energy found which 4.085 x 10^-19J. Also, be sure to cross off the units because it can get very confusing.  

The energy of the photon is 4.08 x 10⁻¹⁹ J

The wavelength of the photon is 2.58 x 10⁻⁶ m

The given parameters;

frequency of the photon, f = 6.165 x 10¹⁴ Hz

The energy of the photon is calculated as;

E = hf

where;

h is Planck's constant = 6.626 x 10⁻³⁴ Js

E = (6.626 x 10⁻³⁴)( 6.165 x 10¹⁴)

E = 4.08 x 10⁻¹⁹ J

The wavelength of the photon is calculated as;

v = fλ

where;

v is the speed of light = 3 x 10⁸ m/s

\(\lambda = \frac{v}{f} \\\\\lambda = \frac{3\times 10^8}{1.165\times 10^{14}} \\\\\lambda = 2.58 \times 10^{-6} \ m\)

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Answer:

sorry i apologize that for my ability it's difficult to provide a diagram but your diagram will expressed as follow. also in summary it represented through notation. below

For the given reaction:

2Ag⁺(aq) + Pb(s) → Pb²⁺(aq) + 2Ag(s)

The voltaic cell consists of the following components:

Anode: The electrode where oxidation occurs. In this case, the anode is the solid lead (Pb) electrode.

Cathode: The electrode where reduction occurs. In this case, the cathode is the solid silver (Ag) electrode.

Anode electrolyte: The electrolyte solution surrounding the anode. It contains silver ions (Ag⁺(aq)).

Cathode electrolyte: The electrolyte solution surrounding the cathode. It contains lead ions (Pb²⁺(aq)).

Salt bridge: A tube or pathway containing an electrolyte solution that connects the two electrolyte solutions, allowing ion flow and maintaining electrical neutrality.

Now, let's write the cell notation for the given reaction:

Anode: Pb(s) | Pb²⁺(aq)

Cathode: 2Ag⁺(aq) | Ag(s)

The cell notation represents the two half-cells separated by a vertical line. The anode is written on the left, and the cathode is written on the right. The single vertical line represents the phase boundary between the electrode and the electrolyte solution. The double line represents the salt bridge.

Therefore, the cell notation for the given reaction is:

Pb(s) | Pb²⁺(aq) || 2Ag⁺(aq) | Ag(s)

Answer: C) 112g of Fe contains the largest number of atoms.

Explanation: When you convert the grams of the elements in the question to the number of particles in 1 mole from there you would be able to determine which choice actually contains more number of atoms than the rest.

You first divide the grams given to you by the atomic mass and then multiply that number by Avogadro's number which is 6.022 x 10^23. As shown in the image.

Answer:

dissolve

Explanation:

When it dissolves , no chemicals are formed and it is considered as a physical property.

Answer:

what is it ???? I need help to

the concentration of Nacl is 14.

The fact that 1% m/v solutions are measured in grams per milliliter (g/mL) rather than grams per hundred milliliters (g/100 mL) obscures the fact that 1 g of water has an estimated volume of 1 mL (at standard pressure and temperature) and that the mass concentration is 100%.

0.01%, 0.05%, 0.10%, 0.20%, 0.30%, 0.50%, 0.80%, 1.00%, 1.50%, 2.00%, 2.50%, and 3.00% are the ratios of NaCl and Aquades, respectively. It indicates that the range of NaCl solution solutions is from 1.7 to 514 mM.

Divide the solute's weight in grams by the total weight of the solution, and then multiply the result by 100 to get the mass/mass percentage (1400/10000*100 =14).

Molarity, molality, mass percentage, parts per thousand, parts per million, and parts per billion are examples of quantitative units of concentration.

The ratio of the solute to solution amounts is known as concentration. The number of moles of a solute per liter of solution is explicitly measured by the unit of concentration known as molarity.

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299.6 lbs concentration of nacl in 1,400 gallons. Sodium chloride, or salt, is an ionic compound with the chemical formula NaCl that represents a 1:1 ratio of sodium and chloride ions.

100 g of NaCl contains 39.34 g Na and 60.66 g Cl, with molar masses of 22.99 and 35.45 g/mol, respectively.

Sodium chloride, or salt, is an ionic compound with the chemical formula NaCl that represents a 1:1 ratio of sodium and chloride ions. 100 g of NaCl contains 39.34 g Na and 60.66 g Cl, with molar masses of 22.99 and 35.45 g/mol, respectively. The salt most responsible for the salinity of seawater and the extracellular fluid of many multicellular organisms is sodium chloride. Table salt, in its edible form, is commonly used as a condiment and food preservative.

Many industrial processes use large amounts of sodium chloride, and it is a major source of sodium and chlorine compounds used as feedstocks for subsequent chemical synthesis.

Salt water weighs 64 lbs/ft3

Fresh water weighs 62.4 lbs/ft3

There are 7.481 gallons in one cubic foot.

There are 64 - 62.4 = 1.6 lbs of salt in 1 ft3 of salt water

which means there are 1.6/7.481 = .214 lbs of salt in one gallon.

So for 1,400 gallons = 1400 * 0.214 = 299.6 lbs

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Answer:

127,236 kj of heat

Explanation:

This is the final answer

Answer:

0.002

Explanation:

The significant figures of a number are digits that are meaningful in trying to resolve a given value. These are actually digits that carry meaning in a given number.

Let s look at  0.002, the zero before the decimal  point carries no real meaning in the number. However, the zeros that precede 2 are all meaningful because the occupy the tenth and hundreth place values.

Hence, there are three significant figure in  0.002.

Answer:

Explanation:

Boi

Gasoline blending in petroleum refineries involves analyzing the properties of different components and determining the optimal mixing ratios to produce gasoline that meets specific octane rating and quality requirements.

Gasoline blending is a critical process in petroleum refineries where different components are combined to produce the desired gasoline product. In this example, the challenge is to blend gasoline from three different components.

To solve the gasoline blending problem, various factors need to be considered such as the desired octane rating, volatility, and environmental regulations. The first step is to determine the optimal proportion of each component based on their individual characteristics. This involves analyzing the properties of each component, such as its research octane number (RON), motor octane number (MON), and vapor pressure.

The second step is to develop a blending strategy that achieves the desired gasoline specifications. This involves determining the appropriate mixing ratios of the three components to meet the target octane rating and other quality requirements. The blending process requires precise calculations and adjustments to ensure the final gasoline product meets the desired specifications.

Additionally, economic considerations play a role in gasoline blending. The cost of each component and the market demand for specific gasoline grades can influence the blending decisions. Refineries aim to optimize the blend to minimize costs while meeting quality standards.

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Answer:

Due to the difference in the relative atomic masses and therefore, the molecular masses of Zn and Pb, one mole of Zn is about 3.2 times lighter than one mole of Pb

Explanation:

From the periodic table, we have;

The atomic number of zinc, Zn = 30

The atomic mass of zinc, Zn = 65.38 amu

The molar mass of zinc, Zn = 65.38 g/mol

The atomic number of lead, Pb = 82

The atomic mass of lead, Pb = 207.2 amu

The molar mass of lead, Pb = 207.2 g/mol

Therefore, whereby equal number of moles of Zn is lost and Pb is gained, we have;

Mass of 1 mole of Zn = 65.38 grams

Therefore, 1 gram of Zn = 1/65.38 moles = 0.0153 moles

0.12 grams of Zn = 0.12×0.0153 = 0.00184 moles of Zn

Given that equal number of moles of Zn and Pb are involved in the reaction, the number of moles of Pb gained = 0.00184 moles

The mass of Pb gained = Number of moles of Pb gained × Molar mass of Pb

The mass of Pb gained = 0.00184 × 207.2 = 0.38 g ≈ 0.4 g.

Amount of Pb gained = 0.43 g ≈ 0.4 g