The molar mass of water (H2O) is 18. 0 g/mol. A sample of water has a mass of 18. 0 g. How many moles of water are contained in this sample? 1. 00 18. 0 36. 0 324.

Answers

Answer 1

1 mole of water is contained in a sample of water that has a mass of 18.0 g.

HOW TO CALCULATE NUMBER OF MOLES:

The number of moles of a substance can be calculated by dividing the mass of that substance by its molar mass.

no. of moles = mass ÷ molar mass

According to this question, a sample of water has a mass of 18.0g. The number of moles is calculated as follows:

no. of moles of H2O = 18.0g ÷ 18g/mol

no. of moles of H2O = 1mol

Therefore, 1 mole of water is contained in a sample of water that has a mass of 18.0 g.

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Related Questions

An ion is:

Select one:

a.
An atom with an extra neutron.

b.
An atom or molecule with an electrical charge.

c.
The outermost shell of an atom.

Answers

The answer is b) an atom with an extra neutron.


The outermost shell of an atom is known as a valence shell.

An atom with an extra neutron is an isotope.

why do the noble gases have relatively low electron affinities?

Answers

Answer:

Because noble gases have a full octet, their ionization energies are actually quite high. Electron affinity is the amount of energy released when an electron is added to a neutral atom. Because noble gases have stable electron configurations, they have very low electron affinities.

Explanation:

Answer:

Noble gases have a stable outer shell

Explanation:

What is the purpose of an indicator in a titration.

Answers

Answer:

The role of indicator in titration is to detect the endpoint of the titration. When the colour of the solution changes, it indicates that the concentration of the chemical specie has reached a critical range. This change in colour is possible with the help of indicators.

Explanation:

hope it helps

#carry on learning and keep safe

correct me if I'm wrong and if correct brainliest me please

Hence, indicators in a titration are used to identify the equivalence or the end point of a reaction where pH change occurs. Note: Apart from phenolphthalein, methylene orange is also used as an indicator that changes color when pH changes. It has red color in acidic solution, and a yellow color in basic solution.

I hop this helps! :)

Which substances will make a salt when combined?

Vinegar and tea

Soda and wine

Soda and ammonia

Fertilizer and detergent

Answers

Answer:

Soda and wine is the answer to your question.

Explanation:

yo make salt you need a base and an acid. in this case the base is soda and the wine is acid. hope that helps :)

PLEASE HELP

When an electron in a hydrogen atom drops from the fifth energy level to the second energy level 4.58 x 10-19 J of energy is released What is the frequency of the photon that is produced?

Answers

Answer:  

e=hf conversion

hope it helps! stay safe as always!

What is the relationship between layering of fluids and density?

Answers

Density of a liquid determines how it will layer (heaviest to lightest). If the liquid is least dense it will float to the bottom. Layers will remain separated because each liquid is actually floating on top of the more dense liquid beneath it.

what happens to glucose in the body?

Answers

After your body has used all the energy it needs, leftover glucose is stored in the liver and muscles. We can store enough fuel for about a day, if you haven't eaten in a while, your blood glucose level drops. :)

Hope this helps!

what is the formula of trinitrogen tetrabromide

Answers

The formula of trinitrogen tetrabromide is N3Br4

How to determine the molecular formula

Trinitrogen features three molecules of nitrogen, N3

Tetrabromide features four molecules of bromide = Br4

Thus, the formula of trinitrogen tetrabromide is N3Br4

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Which subatomic particles have a positive charge and are located in the nucleus?
a. neutrons
b. atoms
c. electrons
d. protons

Answers

Answer: protons

Explanation:

a) Neutrons are located in the nucleus but have a negative charge.

b) Atoms are not subatomic particles but are rather made of subatomic particles.

c) Electrons are subatomic particles with a negative charge that are located outside of the nucleus.

d) Protons are subatomic particles that are located in the nucleus and have a positive charge.

Part A
What question is being asked through this scientific investigation?
(I didn’t know what subject so sorry, also only answer if u have an answer.)

Answers

pretty sure it’s to see whether carbon dioxide is formed in each bottle so if it does form then the balloon would expand

Answer:

How will the ingredients effect the fermentation of each bottle? What will happen to the bottles and balloons when fermentation occurs?

Explanation:

a. Write thepossible isomers of C4 HgBr4​

Answers

The four isomers of C4​H9​OH are

As refer to IMAGE 01- Butan−1−ol

As refer to IMAGE 02- Butan−2−ol

As refer to IMAGE 03- 2−methylpropan−2−ol

As refer to IMAGE 04- 2−methylpropan−1−ol

solution

https://www.toppr.com/ask/en-gb/question/write-down-all-isomers-of-c4-h9oh/

any process that results in the formation of an ion
The energy required to cause a gaseous atom or ion to release a electron is what?

Answers

Answer:

Ionization is the process by which ions are formed by gain or loss of an electron from an atom or molecule.

Jane made this picture to represent a chemical reaction:

Two circles, one white and the other gray are shown on the left. A small portion of the two circles overlap and the label below the circles is XY. An arrow pointing right is shown on the right of the overlapping circles. There are two circles on the right of the arrow, one white and the other gray, and there is a plus sign between them. The white circle is labeled X and the gray circle is labeled Y.

Which of the following statements best explains the type of chemical reaction represented by Jane's picture? (5 points)

It represents a synthesis reaction because one combined reactant forms multiple products.

It represents a synthesis reaction because the same atoms are present in the reactants and products.

It represents a decomposition reaction because one reactant breaks apart and forms two products.

It represents a decomposition reaction because the total mass of the products is less than the mass of the reactant.

Answers

The reaction represents a decomposition reaction because XY is broken into its constituents.

A decomposition reaction is one in which the reactant is broken up into its constituents. In this case, the reactant is XY. The reactant is shown in the left hand side. The reactant is broken up to yield the products. X and Y.

Since the reactant was broken up into the one white and one gray circles labelled X and Y, then the reaction is a decomposition reaction.

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Answer:

C if your answers are different!

Explanation:

Fill in the blank:
A correctly written hypothesis uses an ____ ______ statement

Answers

Answer:

a theory of a experiment and the experiment acts like a judge determining if the hypothesis is right or wrong from the final test result

Explanation:

How does an introduced species affect an ecosystem? Give 2 examples of positive ways
and 2 examples of negative ways.

Answers

Answer:

1+ it can help create balance among the ecosystem, particularly by controlling invasive species

2+ can help restore native ecosystems on degraded land

1- can become an invasive species

2- can cause an imbalance among native species

Explanation:

the method of mass production that developed during the nineteenth century was a process that

Answers

Answer:

Relied on the use of power driven machinery

Explanation:

Its because the machines would increase the mass productivity of goods

The reactant side of a balanced chemical equation is shown below,
PC15 + 4H20 →
How many hydrogen atoms should there be on the product side in the equation? (5 points)
8
6
4
2

Answers

Answer:

do u still need the answer..

Explanation:

Choose all of the examples that show a chemical change.
A) A woodpecker digs in the bark.
B) A dead tree rots on the ground.
C) A forest fire burns a lot of trees.
D) A farmer is cutting logs with an axe.
E) A tree drops rainwater from its leaves.

Answers

Answer:

B and C

Explanation:

Answer:

B) A dead tree rots on the ground.

C) A forest fire burns a lot of trees.

Explanation:

It cannot return the the state it was in before or have the same composition it had before.

Why do some atoms form chemical bonds while others do not?

Answers

Answer:

Atoms of these elements have full outer electron shells. These atoms are stable and very rarely form bonds with other atoms. If the electronegativity values between two atoms are comparable, they may still form chemical bonds to increase the stability of their valence electron shell

Explanation:

how many grams of baf2 are dissolved in 75.0 ml of a saturated solution of baf2? ksp = 1.00 x 10-6

Answers

Using the solubility product of the saturated solution, the mass of BaF2 dissolved is 0.083 g.

The equation of the reaction is obtained from;

BaF2(s) ⇄ Ba^+(aq) + F^-(aq)

The concentration of the substance can be obtained from the Ksp as follows;

Ksp = [Ba^2+] [2F^-]^2

Ksp = 4x^3

x = ∛Ksp/4

x = ∛ 1.00 x 10-6/4

x = 6.3  x 10^-3 M

Given that;

mass/molar mass = concentration x  volume

molar mass  = 175 g/mol

concentration  = 6.3  x 10^-3 M

volume = 75.0 ml or 0.075 L

Mass = ?

Mass  = concentration x  volume x molar mass

Mass  = 6.3  x 10^-3 M x  0.075 L x   175 g/mol

Mass = 0.083 g

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Question 13 (2 points)

Given the following images, choose the one that most likely represents an M-class star. (2 points)

A

B

с

D

Оа

A

Oь в

Ос

О с с

Od D

Answers

Answer:

b. because its Rigel star

Explanation:

hope itsattachments

What are the most of the elements in the periodic table

Answers

Answer:

Most of the elements in the periodic table are metals.

Hope that helps. x

Answer:

Here is your answer,mate!

Explanation:

Metals are the most of the elements in the periodic table.

(1) What is the history of renewable energy in the United States?

(2)What are the advantages and
disadvantages of renewable energy?

(3)What can you do to help forsee a sustainable energy future
in the United States?

You must address all of these
questions in a minimum 2 paragraphs.

Answers

Answer:

Historically, wood was the main source of U.S. energy until the mid-1800s and was the only commercial-scale renewable source of energy in the United States until the first hydropower plants began producing electricity in the 1880s.

The Advantages of Renewable Energy Resources-A Fuel Supply That Never Runs Out.Zero Carbon Emissions.Cleaner Air and Water.Disadvantages of Renewable Energy-he Electricity Generation Capacity is Still Not Large Enough.Renewable Energy Can be Unreliable.

First, we need to take advantage of the world's abundant natural gas resources and reduce coal consumption;

Second, governments must support development of carbon capture and storage technology to make fossil fuel use cleaner;

Explanation:

Why do trees not yet colonize the island?

Answers

Because we humans keep taking them down

Identify the subatomic particles in strontium-82 and rubidium-82. Then, explain what type of nuclear decay is most likely to convert strontium-82 to rubidium-82.

Answers

We can convert strontium-82 to rubidium-82 by positron emission.

The three main fundamental subatomic particles in an atom are;

ProtonsNeutronsElectrons

In a neutral atom, the number of protons is always equal to the number of electrons.

In strontium-82, there are 44 neutrons, 38 electrons and 38 protons. In rubidium-82, there are 45 neutrons, 37 electrons and 37 protons. We can convert  strontium-82 to rubidium-82 by positron emission.

Learn more about positron emission: https://brainly.com/question/11594309

Which of the following is not a use of radioactive isotopes?
a) Energy generation
b) Carbon dating
c) Chemotherapy
d) Radiotherapy

Answers

Answer:

i belive the answer you are looking for is A.. hope this helps!

Explanation:

im not really 100% certain of this answer due to the fact i am a little rusty.

Its A ‏ Believe me I got it on the test


What is the chemical reaction by which organisms break down food
molecules for energy?


Answers

Answer:

cellular respiration

Explanation:

hope this helps :)

brainliest plzzzzzzz

Which of the following liquids has the highest viscosity
A water
B oil
C milk
D honey

Answers

Answer:

honey has the highest viscosity

According to the given option, honey is the liquid that has the highest viscosity. So, the correct option is D.

What do you mean by Viscosity?

Viscosity may be defined as the effects of a liquid by probity of which an internal resistance comes into play when the liquid is in movement and resists the comparable motion between its distinct layers.

Among all the given options, honey possesses more strong intermolecular attractive forces that result in the high compaction of particles in the honey.

After honey, Oil is more viscous followed by milk, and then water.

Therefore, the correct option for this question is D.

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The barometric pressure in Breckenridge, Colorado (elevation 9600 ft) is 580 mmHg. How many kPa is this?

Answers

Answer:

1 atmospheric pressure = 760.0 mm Hg

Thus 580 mm Hg = (580 mm Hg/(760 mm Hg/atm))

= 0.763 atm

Which atom has the largest atomic radius? *
1.Cl
2.F
3.I

Answers

Answer: 2

Explanation:I think

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