A chemistry assignment has a student conduct a single replacement reaction by adding 7.5g of sodium metal to 20.0g of aluminum chloride. How much aluminum in moles would precipitate out as a result of the reaction

Answers

Answer 1

Answer: 0.109 mol

Explanation:

Balanced chemical equation:

3 Na(s) + AlCl3(aq) --> 3 NaCl(aq) + Al(s)

3 moles of sodium metal react with 1 mole of aluminum chloride to produce 3 moles of aluminum chloride and 1 mole of solid aluminum

Molar mass of Na = 22.99 g/mol

Mass(Na) = 7.5 g

Find number of moles of Na:

n = mass of Na/molar mass of Na

=(7.5 g)/(22.99 g/mol)

= 0.3262 mol

Molar mass of AlCl3,

MM = 1*MM(Al) + 3*MM(Cl)

= 1*26.98 + 3*35.45

= 133.33 g/mol

Mass(AlCl3) = 20.0 g

Find number of moles of AlCl3,

n = mass of AlCl3/molar mass of AlCl3

=(20 g)/(1.333*10^2 g/mol)

= 0.15 mol

Balanced chemical equation is:

3 Na + AlCl3 ---> Al + 3 NaCl

3 mol of Na reacts with 1 mol of AlCl3

for 0.3262 mol of Na, 0.1087 mol of AlCl3 is required

But we have 0.15 mol of AlCl3

So, Na is the limiting reagent and we will use it in our further calculations.

According to balanced equation:

mol of Al formed = (1/3) * moles of Na

= (1/3)*0.3262

= 0.1087 mol

Answer: 0.109 mol of aluminum will precipitate out as a result of the reaction


Related Questions

Calculate the (H3O+) for a solution whose pH is 6.79



Note: blank 1 should have three significant figures



The answer is: Blank 1 X 10^Blank 2

Answers

Answer:

Explanation:

alculate the (H3O+) for a solution whose pH is 6.79

Note: blank 1 should have three significant figures

The answer is: Blank 1 X 10^Blank 2

The pH of a solution is the negative logarithm of H₃O⁺ ion concentration.The concentration of H₃O⁺ ions in a solution with a pH of 6.79 is 1.6 × 10⁻⁷M.

What is pH ?

pH of a solution is the measure of its acidity or basicity. Mathematically it is the negative logarithm of its  H₃O⁺ ion concentration. A solution with a pH of 7 is neutral.

The solution with a pH below 7 is acidic and above 7 is basic. Thus, the higher H+ ion concentration, then the pH will be lower and more acidic the solution.

It is given that the pH of the solution is 6.79. The concentration of  H₃O⁺ ions in the solution is calculated is calculated as follows:

pH   = -log ( H₃O⁺)

6.79 = -log( H₃O⁺

[ H₃O⁺] = antilog (-6.79)

             =  1.6 × 10⁻⁷M

Hence, the  hydronium ion H₃O⁺ ion concentration of the solution of pH 6.79 is  1.6 × 10⁻⁷M.

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Find the empirical formula of a compound that contains 34.97 g of Fe and 15.03 g of O.​

Answers

A sample of the black mineral hematite (Figure 2), an oxide of iron found in many iron ores, contains 34.97 g of iron and 15.03 g of oxygen. What is the empirical formula of hematite? The empirical formula is Fe2O3.

220 mL of oxygen gas was collected over water. The total pressure of oxygen plus water vapor was 745.8 mmHg at 25.0°C. What is the pressure, in mmHg, exerted by only the oxygen gas?

Answers

Since 220 mL of oxygen gas was collected over water, the pressure exerted by only the oxygen gas is 720.8 mmHg

Pressure of gas collected over water

The total pressure of a gas collected over water is given by P = P' + p where

P = pressure of oxygen gas and p = vapour pressure of water at 25 °C = 25 mmHg

Making P' subject of the formula, we have

P' = P - p

Since the total pressure of oxygen plus water vapor is P = 745.8 mmHg, substituting the values of the variables into the equation, we have

P' = P - p

P' = 745.8 mmHg - 25 mmHg

P' = 720.8 mmHg

So, Since 220 mL of oxygen gas was collected over water, the pressure exerted by only the oxygen gas is 720.8 mmHg

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Which of the following is a nonmetal?
A.
potassium (K)
B.
aluminum (Al)
C.
calcium (Ca)
D.
chlorine (Cl)

Answers

D. chlorine (Cl)

Chlorine is a nonmetal. Chlorine is a halogen in family VIIA, which is on the right side of the metalloids on the periodic table.

how many grams of lead II chloride are produced from the reaction of 15.3 g of NaCl and 60.8 gr of Pb(NO3)2?

Answers

The mass, in grams, of lead that will be produced from the illustrated reaction would be 71.47 grams

Stoichiometric reactions

From the balanced equation of the reaction:

Pb(NO3)2 + 2NaCl ---> PbCl2 + 2NaNo3

Mole ratio of Pb(NO3)2 and NaCl = 1:2

Mole of 15.3 g NaCl = 15.3/58.4

 = 0.257 moles

Mole of 60.8 g PbCl(NO3)2 = 60.8/331.2

  = 0.184 moles

Thus, NaCl is limiting.

Mole ratio of NaCl to PbCl2 = 1:1

Mas of 0.257 moles PbCl2 = 0.257 x 278.1

 = 71.47 grams

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Metals can be distinguished by dissolving them in fuel and them burning that fuel. For example, calcium will turn orange and copper will turn green. Is this because of blackbody radiation or atomic transitions that you see in line spectra?

Answers

This is because, of the black body raiditon that’s you see in the line spectra

Copper will turn green and calcium will turn orange.  this is as a result of the atomic transitions visible in line spectra

What components make up transitions?

Transition elements are substances with partially filled d orbitals, sometimes referred to as transition metals. According to IUPAC, a transition element is an element with a partially filled d subshell or one with the capacity to create stable cations that has an unfilled d orbital.

Why are transitional elements called that?

As a result of their transitional behavior between s-block or p-block elements, the d-block elements are referred to as transition elements. Their characteristics are intermediate between those of the covalently-bonded, highly reactive s-block metallic elements and those of the p-block elements.

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Why do we have to decide what to do in a day?

Answers

Answer:

otherwise you will be bord and have nothing to do

Explanation:

Because people like to keep busy/have things to do.

Otherwise, we would just be blobs and do nothing.

Am nevoie rapid de aceste exercitii

Answers

Answer:

I will find the answer for you

Explanation:

Just a minute

If 3.500 moles of water react completely according to the following equation, how much heat must be absorbed in kilojoules? 6CO2+6H2O→C6H12O6+6O2ΔH=2,803 kJ

Answers

The amount of heat absorbed in kilojoules when 3.5 moles of water react is 1635.08 KJ

Balanced equation

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂  ΔH = 2803 KJ

From the balanced equation for above,

6 moles of water reacted to absorb 2803 KJ of heat

How to determine the heat absorbed

From the balanced equation for above,

6 moles of water reacted to absorb 2803 KJ of heat

Therefore,

3.5 moles of water will react to absorb = (3.5 × 2803) / 6 = 1635.08 KJ of heat

Thus, 1635.08 KJ of heat were absorbed by the reaction.

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Describe how distillation process makes water soft​

Answers

Answer:

Distillation can be used to separate and collect a liquid from a solution. Distillation can also be used to soften water as the water evaporates as it is heated and the ions are left behind. Hard water can be softened by adding sodium carbonate (washing soda) or by passing the water through an ion-exchange column.

Explanation:

what type of matter is gold, an element used in making jewlery?

Answers

Answer:

Pure gold belongs to ELEMENT because it purely consists of one single element, which is Aurum (Au.)

Explanation:

When pure gold is mixed with other elements to make jewelry, it becomes a mixture.

The volume of a gas is 3.0 L, the pressure is 1.0 atm, and the temperature is 300 K. A chemist changes one factor while keeping another constant so that the new volume is 2.0 L. Which of the following could be the new conditions?

Group of answer choices

The final pressure is 0.5 atm, while temperature is kept constant.

The final temperature is 200 K, while pressure remains constant.

The final pressure is 0.2 atm, while temperature is kept constant.

The final temperature is 350 K, while pressure remains constant.

Answers

Given the data from the question, the final temperature is 200 K, while pressure remains constant.

Basic concepts

To obtain the correct answer to the question, we shall consider two conditions:

Case 1 (temperature is constant) Case 2 (pressure is constant)

Case 1 (Temperature is constant)

We shall determine the new pressure by using the combined gas equation (P₁V₁ / T₁ = P₂V₂ / T₂) as illustrated below:

Initial volume (V₁) = 3 LInitial pressure (P₁) = 1 atmTemperature = constant New Volume (V₂) = 2 L New pressure (P₂) =?

P₁V₁ / T₁ = P₂V₂ / T₂

Since temperature is constant, we have:

P₁V₁ = P₂V₂

3 × 1 = P₂ × 2

3 = P₂ × 2

Divide both side by 2

P₂ = 3 / 2

P₂ = 1.5 atm

Case 2 ( pressure is constant)

We shall determine the new temperature by using the combined gas equation (P₁V₁ / T₁ = P₂V₂ / T₂) as illustrated below:

Initial volume (V₁) = 3 LInitial pressure (T₁) = 300 KPressure = constant New Volume (V₂) = 2 L New pressure (T₂) =?

P₁V₁ / T₁ = P₂V₂ / T₂

Since pressure is constant, we have:

V₁ / T₁ = V₂ / T₂

3 / 300 = 2 / T₂

1 / 100 = 2 / T₂

Cross multiply

T₂ = 100 × 2

T₂ = 200 K

SUMMARY

when the temperature is constant, the new pressure is 1.5 atmWhen the pressure is constant, the new temperature is 200 K

From the calculations made above, we can conclude that the correct answer is:

The final temperature is 200 K, while pressure remains constant.

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Answer:

b

Explanation:

how would changing the proportions in an alloy change its properties

Answers

Answer:

An alloy is a mixture of two or more metals which is produced with a specific proportion between metals. So, if the proportion is changed the physical characteristic would be changed as well. For example, brass musical instruments are made of brass which is a mixture (an alloy) of zinc and copper in a specific proportion. If you change a proportion, you will change the physical characteristic of brass musical instruments, and a sound they produce will be different.

Explanation:

Which elements most easily give up electrons?
A.Oxygen, hydrogen, lithium
B.Copper, gold, silver
C.Copper, oxygen, silver
D.Silver, iodine, helium

Answers

I think it’s a) because they have an extra electron in comparison to other elements and can easily give up their electrons.

determine the degree of ionization at pH 2.0​

Answers

Answer:

answer in the picture above

Kevin and Lisa get into a deep discussion. Kevin believes adding HOT WATER to a test tube that has baking soda will cause the substances to react faster. Lisa, thinks he is wrong and believes that the HOT WATER may cause the substances to not react normally. Based on what you learned from the QUIZZIZZ ACTIVITY, whose side would you take in this argument????

Answers

I agree with idea of Kevin because bakong soda dissociates faster in hot water than cold water.

How baking soda reactivity increase in hot water?

Baking soda is a chemical that can undergo a decomposition reaction when heated. At 80 degrees Celsius, sodium bicarbonate starts to break down into sodium carbonate (Na2CO3), water (H2O) and carbon dioxide (CO2) which is ready for reaction with other chemical.

So we can conclude that Kevin idea is correct because bakong soda dissociates faster in hot water than cold water.

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buffer is prepared by adding 275 mL of .676M of HCl to 500 mL of .525M sodium acetate. What is the pH?

Answers

The pH of the buffer prepared by adding 275 mL of .676M of HCl to 500 mL of .525M sodium acetate is 6.45.

How to calculate pH?

The pH of a buffer solution can be calculated by initially calculating the millimoles of both the conjugate base and acid.

Millimoles of hydrochloric acid = 275mL × 0.676M = 185.9millimolesMillimoles of sodium acetate = 500mL × 0.525M = 262.5millimoles

From, Henderson Hasselbalch equation,

pH = pKa + log conjugate base/acid

pka of HCl = -6.3

-6.3 + log 262.5/185.9

6.3 + 0.15

pH = 6.45

Therefore, the pH of the buffer prepared by adding 275 mL of .676M of HCl to 500 mL of .525M sodium acetate is 6.45.

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A 20 g gold coin is heated from 10°C to 50°C ( CAu is 0.13 J/g−°C ). What is the △H ? (Hint: Remember ΔH=q, so if you solve for q, you might have your answer!)

Answers

Mass=m=20g∆T=50-10=40°CSpecific heat=c=0.13J/g°C

Now

[tex]\\ \rm\rightarrowtail Q=mc\delta T[/tex]

[tex]\\ \rm\rightarrowtail Q=20(40)(0.13)[/tex]

[tex]\\ \rm\rightarrowtail Q=800(0.13)[/tex]

[tex]\\ \rm\rightarrowtail Q=104J[/tex]

If the pH is 6.1,what is the concentration of H^+?

Answers

Hi!

[tex]\\ \sf\rightarrow pH=-log[H^+][/tex]

[tex]\\ \sf\rightarrow -log[H^+]=6.1[/tex]

[tex]\\ \sf\rightarrow log[H^+]=-6.1[/tex]

[tex]\\ \sf\rightarrow [H^+]=10^{-6.1}[/tex]

[tex]\\ \sf\rightarrow [H^+]=7.94M[/tex]

two or more substances combine to form a single new substance

Answers

Answer:

Combination reactions

Explanation:

Hope this helps:)

How many people were considered undernourished in Latin America and the Caribbean in 2018?

Question 4 options:

513.9 million


2.6 million


821.6 million


42.5 million

Answers

D . 42.5 million…………

When two or more magnetic fields overlap, the result is always a _____.

A combined magnetic field
B force of repulsion
C change in the location of the poles
D force of attraction

Answers

Answer:

A. Combined magnetic field

Answer:

A.combined magnetic field

Explanation:

CARRY ON LEARNING#

Select the correct answer.
Iron oxide reacts with aluminum to give aluminum oxide and iron. What kind of chemical reaction is this?

Answers

Answer:

Single-replacement reaction

Explanation:

Single-replacement reactions, aka. single-displacement reactions, involve one element/ion in a compound being replaced by another element/ion. In this case, aluminum is replacing the iron in the compound.

If you need help visualizing, the equation looks like this:

FeO + Al³⁺ --> AlO + Fe³⁺

An atom with more electrons than protons has an overall positive charge and is called a
positive ion

Answers

That is correct! It is a positive ion!

how many grams of Na2co3 will be produced from the thermal decomposition of 250.0 g of nahco3?. 157.7 g​

Answers

The answer is 247.66

Go why?yes but why but no sense so help but yes by hypothesis

Answers

Answer:

follow hypothesis bud

Explanation:

yep

What does the sum of oxidation numbers need to equal for a charged compound?

Answers

Answer:

The charge on the compound

Explanation:

The charge on the compound signifies that the compound is not in its neutral state.

Therefore, the oxidation state would be equal to the charge on the compound.

Answer:

The charge on the compound

Explanation:

The charge on the compound signifies that the compound is not in its neutral state.

Therefore, the oxidation state would be equal to the charge on the compound.

Which type of resources cannot be replenished by natural processes in a reasonably short period of time?

A: nuclear waste
B: natural resources
C: nonrenewable resources
D: renewable resources

Answers

C: Nonrewable resources
I believe that the answer is C.

(a)Determine the number of KNO3 molecules in 0.750 mol KNO3.
(b) What is the mass (in milligrams) of 2.39 x 1020 molecules of Ag2SO4.
(c) Estimate the number of NaHCO2 molecules in 3.429 g of NaHCO2.

Answers

A. The number of molecules in 0.750 mole of KNO₃ is 4.515×10²³ molecules

B. The mass (in milligrams) of 2.39×10²⁰ molecules of Ag₂SO₄ is 124 mg

C. The number of molecules in 3.429 g of NaHCO₂ is 3.04×10²² molecules

Avogadro's hypothesis

1 mole of substance = 6.02×10²³ molecules

A. How to determine the number of molecules

1 mole of KNO₃ = 6.02×10²³ molecules

Therefore,

0.750 mole of KNO₃ = 0.75 × 6.02×10²³

0.750 mole of KNO₃ = 4.515×10²³ molecules

B. How to determine the mass of Ag₂SO₄

6.02×10²³ molecules = 312 g of Ag₂SO₄

Therefore,

2.39×10²⁰ molecules = (2.39×10²⁰ × 312) / 6.02×10²³

2.39×10²⁰ molecules = 0.124 g

Multiply by 1000 to express in mg

2.39×10²⁰ molecules = 0.124 g × 1000

2.39×10²⁰ molecules = 124 mg of Ag₂SO₄

C. How to determine the number of molecules

68 g of NaHCO₂ = 6.02×10²³ molecules

Therefore,

3.429 g of NaHCO₂ = (3.429 × 6.02×10²³) / 68

3.429 g of NaHCO₂ = 3.04×10²² molecules

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Name the Covalent compound NH3O2​

Answers

The name of the covalent compound NH3 O2 is dihydroxylamine.

Naming compounds

According to the task content;

It follows that the given covalent compound whose name is to be written is; NH3O2.

On this note, the compound possesses 2 oxygen atoms, 3 Hydrogen atoms and 1 Nitrogen atom. Hence, the name of the covalent compound is Dihydroxylamine.

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