(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

Answer 1

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

Learn more about Avogadro's number:

https://brainly.com/question/26141731


Related Questions

How do i solve this?

Draw the product of this reaction. Ignore inorganic byproducts.​

Answers

The compound is formed by addition reaction. The product is showed in the image attached.

Addition reaction

The term addition reaction refers to a type of reaction in which a compound is added across the multiple bond. In this case, the iodine molecule is added to the olefinic bond as shown.

The structure of the product formed has been attached to this answer. The product is formed by addition across the double bond.

Learn more about addition reaction: https://brainly.com/question/1446583

Indicate the electron pair geometry and the molecular geometry for each of the six compounds.
Compound Electron pair geometry Molecular geometry
BeCl
2

linear
linear
SO
3

trigonal planar
trigonal planar
SO
2

trigonal planar
bent
SiCl
4





PF
3





SCl
2

Answers

BeCi

2 is the correct answer

An alternating current can be described as one in which:

A. Electrons flow in both directions in the circuit.
B. Electrons flow in only one direction in the circuit
C. Electrons move only from the negative terminal of the battery.
D. Electrons move only from the positive terminal of the battery.

Answers

A

Explanation:

electrons flow in both directions

Answer: A I know it but I forgot how to explain it.

How many moles of PbCl2 are produced
if 14 moles of AICI3 are consumed?
3Pb(NO3)2 + 2AlCl3
>
3PbCl2 + 2A1(NO3)3

Answers

Answer:21 moles of PbCl2 formed

Suppose that a 10-mL sample of a solution is to be tested for I− ion by addition of 1 drop (0.2 mL) of 0.13 M Pb(NO3)2.
What is the minimum number of grams of I− that must be present in order for PbI2(s) ( Ksp=8.49×10−9 ) to form?

Answers

The minimum number of grams of I that must be present is ; 0.01836 * 10⁻³ mol

Given data :

Volume of solution to be tested for I-ion = 10 mL

Volume of  Pb(NO₃)₂ = 0.2 mL

molarity of Pb(NO₃)₂ = 0.13 M

Determine the number of I that must be present

First step : calculate conc of PB²⁺ ions in the solution

conc of PB²⁺ ions =  ( molarity of Pb(NO₃)₂ * volume of  Pb(NO₃)₂ ) / ( total volume )

                              = ( 0.13 * 0.2 ) / ( 10 + 0.2 )

                              = ( 0.026 ) / ( 10.2 )  = 0.002549 M

Next step : determine the molarity of  I

using the dissociation reaction of PbI₂

PbI₂(s) ---> Pb²⁺ (aq)  + 2I (aq)

also;  Ksp = [ Pb²⁺ ] [ I ]²  ---- ( 1 )

From the question the given value of Ksp = 8.49 * 10⁻⁹

Therefore equation ( 1 ) becomes

8.49 * 10⁻⁹ = ( 0.002549 ) * [ I ]²

[ I ] = √ ( 8.49 * 10⁻⁹ ) / ( 0.002549 )

      = 0.0018 M

Final step : Determine the minimum number of grams of I

moles of I = molarity of I * total volume

                 = 0.0018 M * 10.2 mL

                 = 0.01836 * 10⁻³ mol

Hence we can conclude that The minimum number of grams of I that must be present is ; 0.01836 * 10⁻³ mol

Learn more about Pb(NO₃)₂ : https://brainly.com/question/25071409

Granite is part of the crust layer of the earth.

True
False

Answers

Answer:

That would be True

Explanation:

granite is a part of the crust layer.

I might be wrong but I think it’s true

In the following acid-base reaction,
HPO42- is the
H2PO4- (aq) + NH3(aq) → HPO42- (aq) + NH4+(aq)
А
B
С
acid
conjugate
acid
conjugate
base

Answers

Taking into account the Brønsted-Lowry acid-base theory, HPO₄⁻² is conjugate base of H₂PO₄⁻.

Brønsted-Lowry acid-base theory

The Brønsted-Lowry acid-base theory (or the Brønsted-Lowry theory) identifies acids and bases based on whether the species accepts or donates protons or H⁺.

According to this theory, acids are proton donors while bases are proton acceptors.

So, reactions between acids and bases are H⁺ proton transfer reactions, causing the acid to form its conjugate base and the base to form its conjugated acid by exchanging a proton.

In other words, a conjugate base is an ion or molecule resulting from the acid that loses the proton, while a conjugate acid is an ion or molecule resulting from the base that gains the proton:

acid + base ⇄ conjugate base + conjugate acid

This case

In this case, you know:

H₂PO₄⁻ + NH₃ → HPO₄⁻² + NH₄⁺

H₂PO₄⁻ behaves like acid because donates an H⁺ proton while NH₃ behaves like base because accepts an H⁺ proton from the acid.

So, NH₄⁺ is the conjugate acid of the NH₃ and HPO₄⁻² is conjugate base of H₂PO₄⁻.

In summary, HPO₄⁻² is conjugate base of H₂PO₄⁻.

Learn more about the Brønsted-Lowry acid-base theory:

brainly.com/question/12916250

brainly.com/question/1191429

brainly.com/question/4000152

brainly.com/question/12808135

#SPJ1


If a metal reacts violently with water, in which group is it likely to be found?

Answers

Answer:

Alkali metals (Li, Na, K, Rb, Cs, and Fr)

Explanation:

Answer:

Group 1

Explanation:

Alkali metals such as (Lithium, Sodium, Rubidium, Francium, Cesium, etc.) react violently with waterThey are termed "alkali" due to their nature of forming hydroxides on reacting with water

Which of the following molecules contains a covalent bond?

Answers

Answer:

  m

Explanation:

Answer:

CN is your answer.

Explanation:

Hope this helps!!!

Answer this question lol

Answers

A MARK ME AS BRAINLIEST LS

How many grams of Na2S will be produced if you react 35.0g sodium

Answers

If you don’t mind can u add the picture?? It helps me answer the question better ;)

In cells, __________ are proteins that are needed to lower the amount of energy required to start chemical reactions

Answers

Answer: I think it’s enzymes

Explanation:

Calculate the pOH for a solution with a hydroxide ion, (OH-) of concentration of 6.49 X 10-11 M.

Calculate the pH.



Note: the answers should have three significant figures



The pOH is: Blank 1

The pH is: Blank 2

Answers

Answer:

Calculate the pOH for a solution with a hydroxide ion, (OH-) of concentration of 6.49 X 10-11 M.

Calculate the pH.

Note: the answers should have three significant figures

The pOH is: Blank 1

The pH is: Blank 2

Explanation:

What is the pOH of a
2.6 x 10-6 M H+ solution?

Answers

Explanation:

pOH=-log(2.6×10^(-6)

we get around 5.59

(using log)

PLS HELP FAST!! 50 POINTS AND BRAINLEYIST FOR WHOEVER ANSWERS THIS FASTEST.

In one to two sentences, describe the characteristics of a high-pressure system.

In one to two sentences, explain what biome comprises most of Antarctica and why the continent is described as being part of this biome.

ALSO, IF YOU COPY, PLEASE REWORD SENTENCES.

Answers

A high pressure system has higher pressure at its center than the areas around it

Scientists that work in Antarctica mostly refer to the majority of the continent as being a cold desert

Explanation:

Help please!

__________ is caused by a bacteria that can be transmitted by a flea bite, contact with an infected person, or via airborne droplets. Symptoms are lymph glands that are swollen and painful ("buboes", red spots that turn black)

A ) Tuberculosis
B ) Syphilis
C ) Botulism
D ) Bubonic Plague

Answers

Answer:

Bubonic plague is the correct answer!!!

Explanation:

mark me brainliest

Answer:

The answer is Bubonic Plague

• Calculate the entropy change when 1.00 mol of
water at 0°C freezes to form ice. (AHfus for water
is +6.02 kJmoll)
1

Answers

Answer:

the enthalpy change of this is 5.02mol

Calculate the number of moles in 625mL of a 3.0 M NaOH solution

Answers

mol = M(molar concentration) times V (volume)

0.625 L times 3 mol/L = 1.875 mol

What is The fmu (grams/mole) for disulfur hexachloride *the formula for it is S2Cl6*

Answers

Hexasulfur Dichloride

Name: Hexasulfur Dichloride

Formula: S2Cl6

Molar Mass:276.848

Example Reactions:

• S2Cl6 + 4H2O = 2SO2 + 6HCl + H2

For the reaction shown, find the limiting reactant for each of the initial quantities of reactants 4Cr + 3o2 -> 2Cr2O3 d)14.8 mol Cr; 10.3 mol O2

Answers

Answer: O2

Explanation:

The balanced chemical equation is:

4 Cr + 3 O2 ---> 2 Cr2O3

4 mol of Cr reacts with 3 mol of O2 to form 2 mol of Cr2O3

For 14.8 mol of Cr, 11.1 mol of O2 is required

But we have 10.3 mol of O2

So, O2 is the limiting reagent

As soon as the rope breaks in picture 4, the car continues to roll forward on its own. This motion is BEST explained by which of the following laws? A. AN object in constant motion tends to remain in motion unless acted on by and unbalanced force. B. For every action there is an equal and opposite reaction/ C. An unbalanced force acting on an object will cause the object to accelerate. D. The force of gravity will cause an object to accelerate toward the earth at a constant rate.

Answers

Answer:

what is picture 4 you need to show it

what is safe storage of produced materials​

Answers

Answer:

Stacking bags and bundles.

Explanation:

Interlock them in rows to ensure they're secure.

Answer:

Material Storage Facilities means an uncovered area used on a permanent basis for outside

Explanation:

Material Storage Facilities means an uncovered area where bulk materials (liquid, solid, granular, etc.) are stored in piles, barrels, tanks, bins, crates, or other means.

Additional Benchmarks for Federal, State, or Municipal Facilities with Incidental Solid De-Icing Material Storage Facilities monitoring under the requirements of subparagraph (D)(ii) above shall not be subject to Benchmark requirements for Chloride or Cyanide.

Directors are fully briefed on all business related matters, risk assessment and new initiatives proposed by the Company.

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…………

What is radioactive dating in chemistry?
PLEASE HELP!!!

Answers

Radioactive dating uses the concept of half life to determine the age of something.
The general idea is that elements exist naturally as a combination of isotopes. Some isotopes are stable while others decay radioactively. The half-life of a radioactive isotope is the time required to reduce the initial quantity of the isotope by 50% through the process of radioactive decay.
Carbon 14 dating works this way. A tree growing in the past would have an equilibrium mixture of C-12 and C-14 atoms in proportions consistent with living matter today. We know this value.
When that tree dies, it no longer accumulates new carbon atoms from carbon dioxide in the atmosphere (through photosynthesis). At this point, the proportion of C-14 in the organic matter that was the tree decreases due to the decay of C-14 to an isotope of nitrogen.
When we dig up the remnants of the tree today, we can measure the proportion of C-14 to C-12 and see how much it has been reduced. From this we can calculate backwards using the half life of C-14 (5730 years) to estimate how old the remains of the tree are.

the square below has anarea of 49ft2 what is the perimeter of the square

Answers

Answer:

28ft

Explanation:

if it's a square then each side is equal

the square root of 49 is 7

each side is 7 ft

7 ft times 4 sides is 28ft

the answer is 98 because you do 49ft2 divided by two and then that would be the answer to one side so to find the answer you multiply that by 4

To what temperature must a sample of helium gas be cooled from 139ºC to reduce its volume from 3.1 L to 0.71 L at constant pressure?

Answers

Answer:

To what temperature must a sample of helium gas be cooled from 22.2 degrees C to reduce its volume from 1.00L to 100cm3 ?

Explanation:

Suppose you are provided with a 35.83 g sample of potassium chlorate to perform this experiment. What is the mass of potassium chloride you expect to release upon heating?

Answers

For a 35.83 g sample of potassium chlorate,  the mass of potassium chloride is mathematically given as

M Kcl=21.62g

What is the mass of potassium chloride you expect to release upon heating?

Generally, the equation for the Chemical Reaction  is mathematically given as

2KClO_3----->2KCl+2O_2

Therefore

[tex]Mole of KCl=\frac{35.57}{122.55}[/tex]

Mole of KCl=0.29mol

Mass of Kcl=0.29*74.55

Mass of Kcl=21.62g

In conclusion, Mass of Kcl

M Kcl=21.62g

Read more about Chemical Reaction

https://brainly.com/question/11231920

How many moles of sodium hydrogen carbonate are present in 2.61 grams of this compound?

Answers

Molar mass of NaHCO_3

23+1+12+3(16)36+4884g/mol

Now

[tex]\\ \sf\longrightarrow No\:of\:moles=\dfrac{Given\:mass}{Molar\:mass}[/tex]

[tex]\\ \sf\longrightarrow No\:of\; moles=\dfrac{2.61}{84}[/tex]

[tex]\\ \sf\longrightarrow No\:of\:moles=0.0312mol[/tex]

What is the mass in grams of 5.2 x 1028 atoms of manganese (Mn)?

Answers

The mass, in grams, of 5.2 x 10^28 atoms of manganese would be 0.0006833 grams

Mass calculation

According to Avogadro, 1 mole of any substance contains 6.022 x [tex]10^{23}[/tex] atoms.

Thus, how many moles would be in 5.2 x [tex]10^{28}[/tex]atoms of Mn:

         = 6.022 x [tex]10^{23}[/tex] /1 x 5.2 x [tex]10^{28}[/tex]

                       = 0.00001158 moles

Mass of 0.00001158 moles Mn = 0.00001158 x 54.9

                         = 0.0006833 grams

More on Avogadro's constant can be found here: https://brainly.com/question/21177668

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:

Other Questions
Complete the stories,very easy questions Help please!!! I don't understand Select the best estimate of the product of 91 x 58 = ____ 1. How do you feel about yourself knowing that you can do a lot of things? 2. How are you going to improve yourself more? 3. What are your plans about the things you cannot do? 4. Do you wish to be a better person? Why? The following question has two parts. First, answer part A. Then, answer part B.Part AWhich of the following words has the same root as the word microbe? A. bathrobe B. interminable C. microscope D. millimeterPart BGiven your answer to part A, what can you determine the Greek root in the word microbe means? A. between B. measure C. small D. thousand How many times does 8 go into the 7 1/2 How was this bias likely to influence any article the residents of Brook Farm might have written aboutthe Lowell mills? How did the inca roads help the government consolidate and maintain power?. Telling the stories of groups whose experiences have been purposefully silenced or are otherwise not often told is called _________ can someone explain what to do like im a 5 year old please? (pre algebra) area of the base= 75square inches and heigh = 15 inches Is (1, 13) a solution to this system of equations?y = 8x + 5y = 13Yes or No Suppose that $x,y,z$ are positive integers satisfying $x \le y \le z$, and such that the product of all three numbers is twice their sum. What is the sum of all possible values of $z$ What happened after Roger Williams challenged the rules of the church inPlymouth Colony?A. He was sentenced to death,B. He was sent back to England.C. He was forced out of the colonyD. He was given more authoritySUBMIT Both Transverse and Longitudinal Waves transmit____and not_____ A power, work B work, power C energy, matter D matter, energy just trying some stuff coz i dont use this ttoo much (from Unit 5, Lesson 7) Below is a set of data about temperatures. The range of a set of data is the distance between the lowest and highest value in the set. What is the range of these temperatures? 9C, -3C, 22C, -5C, 11C, 15C Type your answer in the box below. The range of temperatures is . Which courts are tribunals created by congress to handle specialized types of cases? Identify if it is biotic or abiotic. And if it is a biotic identify if they are producers, herbivores, carnivores, omnivores, scavengers or decomposers. 1. Nutrients 2. Air 3. Volcanic eruption 4. Lion 5. Koala 6. Typhoon 7. Fire 8. Rocks 9. Vulture 10. Mushroomplease help me if u can answer this brainliest i will mark brainliest rn