How to calculate the number of molecules in 18g of H2O

Answers

Answer 1

We, know molecular mass of water is, M = 16 g/mol .

Given mass of water, m = 18 g.

We know, number of moles is given by :

[tex]n = \dfrac{18\ g}{16 \ g/mol}\\\\n = 1.125\ moles[/tex]

Now, 1 mole of any compound contains 6.022 × 10²³ molecules.

So, number of moles in 1.125 moles of water is 1.125 × 6.022 × 10²³ =

6.77 × 10²³ molecules.

Hence, this is the required solution.


Related Questions

5.4 g of Aluminium reacts with 300 mL of 0.2 mol/L hydrochloric acid solution. a. Write equation for the reaction taking place. b. Specify which reactant is limiting and which reactant is excess. c. Find volume of the gas collected at S.T.P d. How many grams of salt are produced at the end of the reaction? e. How many grams of the excess reactant are left ate the end of the reaction? Given: Al=27 , H=1 , Cl=35.5

Answers

HCl as a limiting reactant

volume of the gas(H₂)= 0.672 L

mass of salt : =2.67 g

mass of excess left :  4.86 g

Further explanation

Given

5.4 g Al

300 mL of 0.2 mol/L HCl

Required

limitng reactants

volume of the gas(H₂)

mass of salt

mass of excess left

Solution

Limiting reacttant

Reaction

2Al + 6HCl → 2AlCl₃ + 3H₂

mol Al = 5.4 g : 27 g/mol = 0.2

mol HCl = 0.3 L x 0.2 mol/L = 0.06

mol : coefficient of reactants :

Al = 0.2 : 2 = 0.1

HCl = 0.06 : 6 = 0.01

HCl as a limiting reactant(smaller ratio)

Al as an excess reactant

volume of H₂

mol H₂ = 3/6 x mol HCl = 3/6 x 0.06 = 0.03

volume (STP : 1 mol=22.4 L) :

= 0.03 x 22.4 L

= 0.672 L

mass of salt(AlCl₃)

mol AlCl₃ = 2/6 x mol HCl = 2/6 x 0.06 = 0.02

mass AlCl₃ :

= mol x MW

= 0.02 x 133.5

=2.67 g

mass of excess(Al) left

mol (reacted) : 2/6 x mol HCl = 2/6 x 0.06 = 0.02

mol (unreacted) : 0.2 - 0.02 = 0.18

mass = 0.18 x 27 g/mol = 4.86 g

describe how oxides of nitrogen are produced when petrol is burned in car engines !!HELP!!

Answers

Answer:

Answer is on the pic

Explanation:

I hope it's helpful!

Which equation is derived from the combined gas law?


StartFraction V subscript 1 over T subscript 1 EndFraction equals StartFraction V subscript 2 over T subscript 2 EndFraction.


StartFraction V subscript 1 over T subscript 2 EndFraction equals StartFraction V subscript 2 over T subscript 1 EndFraction.


V subscript 1 T subscript 1 equals P subscript 2 T subscript 2.


P subscript 1 V subscript 1 T subscript 1 equals P subscript 2 V subscript 2 T subscript 2.


I put "A" as my answer and got it correct....so V1/T1 = V2/T2 is your answer :)

Answers

Answer:

if you are correct then my dude... you are correct

Correct = A)

Explanation:

                          ~Notify me if you have questions~

                      no reason in saying "hope this helps" lol

                         -Note I can be vented to if needed-

                                       Have a nice day!~

                                                  ^ω^

-- XxFTSxX

Answer:

The answer is A

Explanation:

I got 100% on the Quiz on Edge 2021

i need help i hate multi selects. 100 points please let me know

Answers

Answer:

d would be both liquids and gasses

Explanation:

Answer:

A. Gases

B. Solids

C. Gases

D. liquids and solids

So basically all ur answers are right except D

Explanation:

Brainlist?

When animals breathe, which of Earth's sphere's are interacting?

Answers

Answer: Atmosphere

Hope this helps! ^^

0.65743 In scientific notation

Answers

202827.0000 is the answer I think idrk

HELP !!!


1. How do substances like CO2 and water move in and out of the cell? Explain.

Answers

Answer:

The substances like CO2 and water move in and out of a cell by diffusion from the region of high concentration to low concentration. ... When the concentration outside the cell becomes low and it is high inside the cell, they moves out.

Answer:

CO2 moves by diffusion and H2O move by osmosis through cell membrane .

Iron sulfide is a compound. It is made by heating a mixture of iron and sulfur.
Describe and explain the differences between iron sulfide and a mixture of iron and sulfur.

Answers

Answer:

Here are some of the differences between a mixture of iron and sulfur, and iron sulfide: the mixture can contain more or less iron, but iron sulfide always contains equal amounts of iron and sulfur. the iron and sulfur atoms are not joined together in the mixture, but they are joined together in iron sulfide.

Explanation:

A boat covers 2,000 meters in 30 minutes. How fast are they traveling

Answers

1+1 is 2 hope this helps

HELP HELP IM FAILING PLZ HELP ME

What is the formula mass of calcium nitrate tetrahydrate (Ca (NO3)2 · 4H0]?
Be sure to add the water of hydration, which is the 4H2O part (water surrounding the calcium
nitrate).


102 g/mol
164 g/mol
174 9/mol
236 g/mol

Answers

Answer:

236 g/mol

Explanation:

This question is asking to calculate the molar mass/formula mass of calcium nitrate tetrahydrate with the chemical formula: Ca(NO3)2 · 4H20. This is done as follows:

Atomic mass of the constituent elements are as follows:

Ca = 40

N = 14

O = 16

H = 1

Hence, in Ca(NO3)2 · 4H20.

= 40 + {14 + 16(3)}2 + 4 {1(2) + 16}

= 40 + {14 + 48}2 + 4{2 + 16}

= 40 + {62}2 + 4{18}

= 40 + 124 + 72

= 236

Hence, the molar mass of Ca(NO3)2 · 4H20 is 236g/mol.

Answer:

236 g/mol

Explanation:

show how to work out...Calculate the mass in grams of 3.50 x 1025 atoms of lithium. Answer: 404g Li​

Answers

Take your number of atoms and divide by Avrogadros number, then multiply by molar mass of lithium to get your final answer

The diagram shows heat energy being transferred as hot water rises to the top of the pot and cool water sinks to the bottom.
water cools
cool
water
sinks
cool
water
hot
sinks
water
rises
What process is shown in the diagram?
A conduction
B. convection
O c Insulation
O D. radiation

Answers

I think it would be insulation

What is the answer for this?

Answers

Particle E is an atom because on the periodic table the number of protons is the same exact number of electrons and the number of neutrons cannot exceed one because protons and neutrons add up to give electrons

Please help with this

Answers

1. Double-Replacement reactions

2. Decomposition  

3. Combustion

4. Syntesis

5. Single replacement

Further explanation

Given

Chemical equations

Required

Type of reaction

Solution

1. 2AgNO₃ + MgCl₂ ⇒ 2AgCl + Mg(NO₃)₂

Double-Replacement reactions. Happens if there is an ion exchange between two ion compounds in the reactant

2. 2KBr⇒2K +Br₂

Decomposition  

Single compound breaks down in to 2 or more products

3. C₃H₈ + 5O₂ ⇒ 4H₂O + 3CO₂

Combustion

Hydrocarbon and Oxygen reaction and form water and carbon dioxide

4. NaO + H₂O ⇒ NaOH

Syntesis

2 or more reactants combine to form a single product

5. Zn + CuCl₂ ⇒ZnCl₂ + Cu

Single replacement

One element replaces another element from a compound

Explain how natural resources are identified and why natural recourses are in evenly distributed.

Answers

Answer:

Natural resources are not evenly distributed all over the world. Some places are more endowed that others — for instance, some regions have lots of water (and access to ocean and seas). Others have lots of minerals and forestlands. Others have metallic rocks, wildlife, fossil fuels and so on.

Explanation:

Guys pleasee helpp 20 points

Answers

Answer is B I’m certain

Plant cells use photosynthesis to make food. ​Plant cells also use cellular respiration to get energy from the food they make. ​How is cellular respiration different from photosynthesis?
A Photosynthesis produces ATP, and cellular respiration produces sugars.
B Photosynthesis requires oxygen, and cellular respiration requires carbon dioxide
C Photosynthesis produces oxygen, and cellular respiration produces carbon dioxide.
D Photosynthesis requires energy from food, and cellular respiration requires energy from the sun.

Answers

Answer:

Photosynthesis converts carbon dioxide and water into oxygen and glucose. Glucose is used as food by the plant and oxygen is a by-product. Cellular respiration converts oxygen and glucose into water and carbon dioxide. Water and carbon dioxide are by- products and ATP is energy that is transformed from the process. So, the answer is A.

Explanation:

I hope this helps. :D

Cellular respiration is different from photosynthesis as photosynthesis produces ATP, and cellular respiration produces sugars. Hence, option A is correct.

What is photosynthesis?

Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.

Photosynthesis converts carbon dioxide and water into oxygen and glucose.

Glucose is used as food by the plant and oxygen is a by-product.

Cellular respiration converts oxygen and glucose into water and carbon dioxide.

Water and carbon dioxide are by-products and ATP is energy that is transformed from the process.

Hence, option A is correct.

Learn more about photosynthesis here:

https://brainly.com/question/1388366

#SPJ2

How many molecules are in 2.91 X 1022 atoms of He​

Answers

Answer:

Explanation:

1 mole of oranges contains 6.02 x1023 oranges. 1 mole of helium gas contains 6.02 x1023 helium atoms. 1 mole of water contains 6.02 x1023 water molecules.

...

Answer:

25194.56

Explanation:

You'll  need a scientifuc calculator

2.91*10^22*1 = 2.91E22

2.91E22-/6.02*10^23=25194.56

6.02*10^22 Is the Mole number

Hydrazine, N2H4, and hydrogen, H2O2, have been used as rocket propellants. They react according to the equation:

H2O2 + N2H4 → N2 + H2O

a. How many moles of N2 are formed from 0.0250 moles of N2H4? (0.0250)

b. How many moles of H2O2 are required if 1.35 moles of H2O is to be produced? (0.675)

c. How many moles of H2O are formed if 1.87 moles of N2 is produced? (7.48)

Answers

Explanation:

The equation of the reaction is;

H2O2 + N2H4 → N2 + H2O

Upon balancing the reaction, we have;

N2H4 + 2H2O2 → N2 + 4H2O  

a. How many moles of N2 are formed from 0.0250 moles of N2H4?

From the equation of the reaction;

1 mol of N2H4 produces 1 mol of N2

0.0250 mol of N2H4 would produce x mol of N2

1 = 1

0.0250 = x

x = 0.0250 * 1 / 1 = 0.0250 mol

b. How many moles of H2O2 are required if 1.35 moles of H2O is to be produced?

From the equation of the reaction;

2 mol of H2O2 produces 4 mol of H2O

x mol of H2O2 produces 1.35 mol of H2O

2 = 4

x = 1.35

x = 1.35 * 2 / 4 = 0.675 mol

c. How many moles of H2O are formed if 1.87 moles of N2 is produced?

The relationship between H2O produced and N2 is;

For every 1 mol of N2 produced, 4 mol of H2O is produced

1.87 mol of N2 produced, how many moles of H2O is produced?

1 = 4

1.87 = x

x = 1.87 * 4 / 1 = 7.48 mol

what is the mass of 2.40 moles of h3po4?

Answers

Answer:

i think am right  Molar mass of H3PO4 is 97.9952 g/mol Copy to clipboard. Compound name is phosphoric acid. Convert between H3PO4 weight and moles ...

Explanation:

Explanation:

Molar mass of H3PO4 = 97.99g/mol

Mass of 2.40 moles of H3PO4

= 2.40mol * (97.99g/mol) = 235.2g.

Is the method for converting molecules to moles the same as that for atoms?

Answers

Answer:

One mole is the Avogadro's number of particles (atoms, molecules, ions or electrons) in a substance. Converting to moles is fairly easy because the conversion is always the same.

The smallest fundamental of an element is called an atom while two or more atoms join together to produce a molecule. Molecules are the fundamental of any given compound or a substance.

Yes, the method of converting molecules and atoms to moles are similar.

The method of conversion can be explained as:

The moles are defined by the presence of Avogadro's number that gives the number of particles present in a substance.

The method of converting molecules into moles requires the division of the molecules by [tex]6.02 \times 10^{23}[/tex]. This number which is used in dividing is called  Avogadro's number.

For converting atoms into moles the number of atoms is divided with the Avogadro's number [tex]6.02 \times 10^{23}[/tex].

Therefore, the conversion to moles is easy and the same.

Learn more about moles and Avogadro's number here:

https://brainly.com/question/16398159

How is the chemical bonding within a crystal of gold (Au) different from the
chemical bonding within a crystal of table salt (NaCl)?

Answers

Answer:

In the gold crystal, the atoms are bonded by freely moving electrons. In the salt crystal, the atoms are bonded by the attraction of opposite electrical charges.

Explanation:

A.pex

A crystal of Gold (Au) has metallic bonding whereas a crystal of NaCl has ionic bonding.

What is Chemical Bonding?

Chemical bonding refers to the formation of a chemical bond between two or more atoms, molecules or ions to give rise to a chemical compound.

Ionic bonding occurs by transfer of electrons from one atom to another and is usually between a metal and a non metal atom. This type of bond is classically described as occurring when atoms interact with one another to either lose or gain electrons.

Metallic bonds are the chemical bonds that hold atoms together in metals.

Therefore, A crystal of Gold (Au) has metallic bonding whereas a crystal of NaCl has ionic bonding.

Learn more about Chemical Bonding, here:

https://brainly.com/question/15444131

#SPJ5

What ideas do you have about how two places
could have the same amount of sunlight but
different skin cancer rates?

Answers

Answer:

it could depend on the environment of the area, how the sun rays are parting through particles in the air, or it jus might be the amount of heat radiation is coming down cause it could be a chilly sunny day or a hot sunny day

The ability to pound metal into a flat sheet without breaking it is:

A. Luster
B. Malleability
C. Ductile

Answers

Answer: B

Explanation: Cuz .

Answer: The answer to your question is A

Explanation: Hey I miss you

Which three elements have the most similar chemical properties?
1.
Ar, Kr, Br
2
K, Rb, Cs
3.
B, C, N.
4.
O, N, Si

Answers

Answer:

2.

Explanation:

Beacuse they are all group 1 metals. All have the same boiling, melting point and reactivity due to one electron in its outer shell.

Potassium(k), rubidium(Rb), and cesium(Cs) are the three elements from the given list that have the most similar chemical properties.

Therefore the correct answer is option 2.

What is the atomic number?

The total number of protons present in an atom is known as the atomic number of that atom. The atomic number has no correlation either with the number of neutrons or the number of electrons present inside an atom.

While the atomic mass of an atom is the sum of the total number of protons and the number of neutrons present inside of any atom.

From the list of elements, potassium (k), rubidium (Rb), and cesium (Cs) are the three that share the most chemical similarities.

Thus, option 2 is the right response.

To learn more about the atomic number from here, refer to the link;

brainly.com/question/14190064

#SPJ6

How many grams of Fe are needed to create 32.5mol Fe3O4?

Answers

Answer:

5444.89 grams of Fe

Explanation:

1) We need the chemical equation for Fe3O4 to find the mole ratio for Fe to Fe3O4. Chemical equation:

3Fe+4H2O → Fe3O4+4H2

The mole ratio of Fe to Fe3O4 is 3:1

2) Now, we find how many grams of Fe are needed to produce 32.5 moles of Fe3O4.

[tex]32.5 moles Fe3O4[/tex][tex]x \frac{4 mole O}{1 mole Fe3O4}[/tex] = 97.5 moles Fe needed to produce 32.5 moles of Fe3O4

3) Convert 97.5 moles of Fe into grams. The molar mass of Fe is 55.845g.

[tex]97.5 mole Fe[/tex][tex]x\frac{55.845g Fe}{1 mole Fe}[/tex] = 5444.8875g or 5444.89g.

The amount of force on an area is know as volume, acceleration, pressure, or momentum

Answers

Answer:

Pressure

Explanation:

How many milliliters of an aqueous solution of 0.222 M manganese(II) iodide is needed to obtain 9.57 grams of the salt?​

Answers

Answer:

139 mL

Explanation:

Given data:

Volume of solution required = ?

Molarity of solution = 0.222 M

Mass of salt = 9.57 g

Solution:

Number of moles of manganese iodide:

Number of moles = mass/molar mass

Number of moles = 9.57 g/ 308.75 g/mol

Number of moles = 0.031 mol

Volume required:

Molarity = number of moles of solute / volume in L

0.222 M = 0.031 mol / V

V = 0.031 mol / 0.222 mol/L

V = 0.139 L

Volume in mL:

0.139 L ×1000 mL / 1 L

139 mL

Calculate the volume, at STP, of a 0.950 g sample of Carbon Monoxide gas, CO.

Answers

Answer:

0.76L is the pressure of CO at STP

Explanation:

To solve this question we must use combined gas law:

PV = nRT

Where P is the pressure of the gas (1atm at STP)

V is volume (Our incognite)

n are moles of the gas (0.950g * (1mol/28g) = 0.034 moles

R is gas constant (0.082atmL/molK)

T is absolute temperature (273.15K at STP)

V = nRT/P

V = 0.034mol*0.082atmL/molK*273.15K / 1atm

V = 0.76L is the pressure of CO at STP

Which of the following is TRUE about an astronaut traveling from planet to planet?
The weight changes, but his or her mass does not.
The weight and mass both stay the same.
The weight and mass both change.
The mass changes, but his or her weight does not. PLEASE ANSWER QUICKLY

Answers

Answer:

The weight changes, but his or her mass does not.

Explanation:

The true statement from the given choices about an astronaut traveling from planet to planet is that the weight changes but his or her mass does not.

This is due to the difference in acceleration due gravity from one planet to the other.

Mass is the amount of matter present within a substance. Weight is the vertical force on a body due to its mass and acceleration due gravity

Gravity from one planet to the other differs significant and so is the weight.

Other Questions
[tex]\sqrt[47][134}[/tex] 6.00 g of a certain Compound X, known to be made of carbon, hydrogen and perhaps oxygen, and to have a molecular molar mass of 26. g/mol, is burned completely in excess oxygen, and the mass of the products carefully measured: product mass carbon dioxide 20.31gwater 4.16 g Use this information to find the molecular formula of X Solving one step equations X-7 = 21 What is the reason you go to bed at this tmes Expand and simplify (x + 5)(x + 4) ???????????????????????????????????? Which point is NOT correctly placed on this number line?also if u can pls explain it to if not its ok The average diameter of red blood cell is 0.000007m. Write this measurement in scientific notation. That presidents are often the most well-known politicians outside of their home countries is a reflection of their role as ______. symbolic head of state policy and agenda-setter commander-in-chief comforter-in-chief Factor quadratic equation 6x.squared +41x + 63 = 0 The pH of a sample of blood is 7.4, while gastric juice is pH 1.4. The blood sample has: Group of answer choices 0.189 times the [H ] as the gastric juice. 6 times lower [H ] than the gastric juice. one million times lower [H ] than the gastric juice 5.29 times lower [H ] than the gastric juice. 6000 times lower [H ] than the gastric juice. Add parentheses to make this equation true 7 + 8 - 2 x 3 = 25 3. *2 pointsJessica bought seven boxes. A week laterhalf of all her boxes were lost during amove. There are now only 13 boxes left.With how many did she start? The MN blood group in humans is determined by two alleles of a single gene. In a population containing 90 individuals with genotype MM and blood group M, 80 individuals with genotype MN and blood group MN, and 30 individuals with genotype NN and blood group N, what is the frequency of the genotype MN What is the side length of a square with the area of 20cm2 explain one thing our parents would say our generation doesn't understand about them The inductee said, "It my membership is my greatest honor!" What is the smallest representative particle of an element? The graph below represents how much money Marcia charges for babysitting a certain number of hours.Explain the meaning of the point (1,15) and why the point (0,0) appears on the graph. THIS IS MEH>>>>>>PLS R ATE