Calculate the molarity of a solution prepared by diluting 7.0 mL of 4.0 M solution to a volume of 30 mL.

Answers

Answer 1

Considering the definition of dilution, the molarity of a solution prepared by diluting 7.0 mL of 4.0 M solution to a volume of 30 mL is 0.93 mL.

What is diluion

First of all, you have to know that when it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.

Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volume

Molarity of the solution in this case

In this case, you know:

Ci= 4 M Vi= 7 mLCf= ?Vf= 30 mL

Replacing in the definition of dilution:

4 M× 7 mL= Cf× 30 mL

Solving:

(4 M× 7 mL)÷ 30 mL= Cf

Cf= 0.93 mL

In summary, the molarity of a solution prepared by diluting 7.0 mL of 4.0 M solution to a volume of 30 mL is 0.93 mL.

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Related Questions

In one to two sentences, describe characteristics of a high-pressure system.
i give brainlist
pls answer in your own words

Answers

Answer:

A high pressure area is an area where the air sinks. As it does, it warms up by the adiabatic effect of a greater pressure and that causes the clouds to evaporate, giving place to a clear sky

Explanation:

A high-stress area, high, or anticyclone, is a location in which the atmospheric stress on the surface of the planet is more than its surrounding environment.

What are the traits of the high-pressure system?

In a high-Pressure system, it has better pressure in its center than in the regions around it. Winds blow away from excessive pressure.

Swirling withinside the contrary route from a low-stress system, the winds of an excessive pressure system rotates clockwise north of the equator and counterclockwise south of the equator.

Hence, these are the characteristics of high-pressure system.

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Can someone help me explain three features that make Lake Baikal one of the most unique lakes in the world.

Answers

Explanation:

1,it's crystal clear water and unique wild life.

2,It is home to many unique species animals and plants.

3, It's sediment have not been scoured by overriding continental ice sheet

Magnesium + ... → Magnesium chloride + ....​

Answers

Mg + HCl → MgCl_2 + H_2

(─.─||)

Answer:

Magnesium + hydrochloric acid → Magnesium chloride + hydrogen gas

Explanation:

acid + reactive metal (magnesium) → salt + hydrogen gas

A sample of no2 occupies 16,500 ml at stp. How many no2 molecules are in the sample?.

Answers

here it is! mL to Liters to moles to molecules

According to Avogadro's law equal volume of all gases at the same temperature and pressure contain equal number of molecules. At STP one mole of any gas behaving ideally occupies a volume of 22.414 L.

What is molar volume?

The volume occupied by one mole of a substance at a given temperature and pressure is defined as the molar volume at that temperature and pressure. The value of molar volume of an ideal gas at STP is important in stoichiometric calculations.

At STP, the number of molecules of a gas is given as:

Number of molecules of a gas (N) = V₀ in L /  22.414 × 6.022 × 10²³

Here  V₀ in L = 16500 = 16.5 L

N =  16.5 / 22.414  × 6.022 × 10²³

N = 4.433 × 10²³

Thus the number of molecules present is 4.432 × 10²³.

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Please help with this answer!

Answers

[tex]\qquad\qquad\huge\underline{{\sf Answer}}♨[/tex]

The Correct choice is : D

if temperature is held constant, then they have same average kinetic Energy because there's no change in energy caused by transfer of heat or something.

According to the forces of attraction, if temperature is constant the particles have the same average kinetic energy.

What are forces of attraction?

Forces of attraction is defined as  a force by  means of which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in  case of gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as  the melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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An atom that has 84 protons and 86 neutrons undergoes a reaction. At the end of the reaction, it has 82 protons and 84 neutrons. What happened to the atom? It accepted radiation in a chemical reaction. It donated neutrons to another atom in a chemical reaction. It emitted an alpha particle in a nuclear reaction. It released a beta particle in a nuclear reaction.

Answers

Answer:

C

Explanation:

It denotes a loss of 2 protons and 2 neutrons for the atom. As a result, the atom released an alpha particle, which is composed of two protons and two neutrons, hence option C is correct.

What is an alpha particle?

The structure of alpha particles, also known as alpha rays or alpha radiation, is similar to that of the helium-4 nucleus and is made up of two protons and two neutrons bonded together.

They often result from the alpha decay process, although they can also result from other processes.

If an atom has 84 protons and 86 neutrons, after the reaction, the atom has 82 protons and 84 neutrons, it suggests that the atom has lost 2 protons and 2 neutrons.

Therefore, the atom emitted an alpha particle in a nuclear reaction, hence option C is correct.

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A chemist dilutes a 1.0 ml sample of 2.0 m kno3 by adding water to it. if the concentration of the solution that is obtained is 0.0080 m, what is its volume? use m subscript i v subscript i equals m subscript f v subscript f.. 125 ml 250 ml 500 ml 2,000 ml

Answers

A chemist dilutes a 1.0 ml sample of 2.0M KNO₃ by adding water to it. If the concentration of the solution that is obtained is 0.0080 m, then its volume is 250mL.

How do we calculate volume?

Volume for the given equation will be calculated by using the below equation as:

M₁V₁ = M₂V₂, where

M₁ = molarity of KNO₃ = 2M

V₁ = volume of KNO₃ = 1mL

M₂ = molarity of final solution = 0.0080M

V₂ = volume of final solution = ?

On putting these values on the above equation, we get

V₂ = (2)(1) / (0.0080) = 250mL

Hence option (2) is correct.

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Answer:

B. 250 mL

Explanation:

Correct on Edge 2022!!!

Good luck everyone, you got this! Have a great day!


Write down the structural formula for the monomer from which
polyvinyl chloride is derived.
(2)
Give the name of the monomer.

Answers

Answer:

Vinyl chloride is an organochloride with the formula H2C=CHCl that is also called vinyl chloride monomer (VCM) or chloroethene. This colorless compound is an important industrial chemical chiefly used to produce the polymer polyvinyl chloride (PVC).

Explanation:

Answer:

CH2=CHCl

Explanation:

. If 3 moles of calcium reacts with 3 moles of oxygen, then a Which substance is the limiting reactant? b How many moles of calcium oxide are formed?​

Answers

Let's see the balanced equation

[tex]\\ \rm\Rrightarrow 2Ca+O_2\longrightarrow 2CaO[/tex]

Hence

As moles are equal given

Ca should be the limiting reagent

2mol Ca produces 2 mol CaO3mol Ca produces 3mol CaO

Which phrase describes a dipole moment? (1 point)
the separation of positive and negative charges

the vibration of a molecule

the imbalance of positive and negative charges

the releasing of energy from a molecule

Which statement best summarizes the presence of greenhouse gases in the atmosphere? (1 point)

The atmosphere is mostly non-greenhouse gases, so the small amount of greenhouse gases have little impact on climate

The atmosphere has recently changed and is mostly greenhouse gases, but they have little impact on climate

The atmosphere is mostly non-greenhouse gases, but the small amount of greenhouse gases have a large impact on climate

The atmosphere has recently changed and is mostly greenhouse gases, which have a large impact on climate

Which observed consequence is due to increased production of greenhouse gases? (1 point)

more glaciers

global cooling

melted ice caps

fewer floods

Are greenhouse gases and the greenhouse effect ever beneficial? Why or why not? (1 point)

No, greenhouse gases are a result of air pollution, which is detrimental to the environment.

Yes, industries need to consume greenhouse gases to help people keep their standard of living

No, too many greenhouse gases cause the planet to retain too much heat.

Yes, the greenhouse effect keeps the planet warm enough to support life.

Which molecule acts as a greenhouse gas? (1 point)

nitric oxide (NO)

oxygen (0₂)

nitrous oxide (N₂O)

nitrogen (N₂)​

Answers

Answer:

1. the imbalance of positive and negative charges.

Explanation

The electric dipole moment is a measure of the separation of positive and negative electrical charges within a system, that is, a measure of the system's overall polarity.

2.The atmosphere has recently changed and is mostly greenhouse gases, which have a large impact on climate

Explanation.

They cause climate change by trapping heat, and they also contribute to respiratory disease from smog and air pollution. Extreme weather, food supply disruptions, and increased wildfires are other effects of climate change caused by greenhouse gases.

3.melted ice caps

explanation

A stronger greenhouse effect will warm the ocean and partially melt glaciers and ice sheets, increasing sea level. Ocean water also will expand if it warms overexcessively.

4.Yes, the greenhouse effect keeps the planet warm enough to support life.

Explanation

The greenhouse effect is a good thing. It warms the planet to its comfortable average of 59 degrees Fahrenheit (15 degrees Celsius) and keeps life on earth, well, livable. Without it the world would be a frozen, uninhabitable place, more like Mars.

5.nitrous oxide.

Explanation

There are several different types of greenhouse gases. The major ones are carbon dioxide, water vapor, methane, and nitrous oxide. These gas molecules all are made of three or more atoms. The atoms are held together loosely enough that they vibrate when they absorb heat.

The phrase which  describes a dipole moment is the separation of positive and negative charges,the  statement best summarizes the presence of greenhouse gases in the atmosphere , the atmosphere is mostly non-greenhouse gases, but the small amount of greenhouse gases in an ecosystem have a large impact on climate.

What is an ecosystem?

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .The more glaciers is the consequence is due to increased production of greenhouse gases.The greenhouse effect keeps the planet warm enough to support life. Nitrous oxide molecule acts as a greenhouse gas.

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How many liter are in 55.5 grams of neon?

Answers

MolesofAr(n)= given mass/ molar mass of neon= 55.5/20.17=2.75moles

Volume of the gas = 2.75moles x 22.4L=61.63L

The answer to the question is-61.63L

How many moles of potassium sulfate would you need to prepare 1200 grams of 5.0% potassium sulfate (m/m) solution? Select one: a. 0.34 mols b. 60 mols c. 3.4 mols d. 174 mols​

Answers

Answer:

The moles of potassium that you would need to prepare 1200 g of 5% potassium sulfate solution is 1.538 moles

Which of the following is not a suggested strategy for treating or preventing a communicable disease?

Get vaccinated to prevent infection from a virus.
Receive a vaccine while you are ill from a virus.
Get tested for a suspected infectious disease.
Use hand sanitizer if soap isn't available.

Answers

The strategy that is not a suggested way of treating or preventing a communicable disease is to receive a vaccine while you are ill from a virus.

Treatment and prevention of communicable disease

A communicable disease is a type of disease that can spread from one person to another in the following ways:

contact with blood and bodily fluids;

breathing in an airborne virus, or

being bitten by an insect.

There are various ways to prevent the spread of communicable diseases which include:

Immunization against infectious diseases,

washing of hands regularly or the use of hand sanitisers if soap is not available.

Get tested for a suspected infectious disease

To receive a vaccine while ill from a virus is not advisable because there may be chances of spreading your illness to health care workers who are administering the vaccine.

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How do I know the numerical subscript of an element? for example CuCl 2

Cu is copper (II), how do we know its roman number is 3

Answers

Answer:

"The Roman numeral denotes the charge and the oxidation state of the transition metal ion. For example, iron can form two common ions, Fe2+ and Fe3+. To distinguish the difference, Fe2+ would be named iron (II) and Fe3+ would be named iron (III)."

Explanation:

In chemistry, Roman numerals are used for a specific group of elements called transition metals. The Roman numerals indicate the charges that these metals carry in a compound.

Which additional product balances the reaction H2SO4 + 2NaOH → Na2SO4 + ________?

2H2O
2OH
H2O2
H3O

Answers

Answer:

2H2O

It's a double displacement reaction

It is H3O for the balance

Which weather condition is NOT associated with warm fronts??

Answers

Answer:

A Winter storm usually does not come with a warm fronthey warm front.

Explanation:

When the front passes over an area it means to change in the weather. Many. Many friends cause weather events such as rain thunderstorms gusty winds tornadoes and hurricanes.

How do you figure out the number of protons in an atom?
How do you figure out the number of protons in an atom?

Answers

Answer:

Atomic number shows u the amount of protons there are in the atom

The protons are equal to the number of electrons

The group number tells  you  the number of electrons on the outer shell

(Sorry if u didn’t want the extra info but really it’s simple like magnesium has 12 so it has 12 protons/ 12 electrons)

Answer:

To calculate the numbers of subatomic particles in an atom, use its atomic  number and mass number:

1. number of protons = atomic number.

2. number of electrons = atomic number.

3.number of neutrons = mass number - atomic number.

What is the pressure in a 8.00 L tank with 50.5 grams of chlorine gas at 365 K?

Answers

The pressure in the 8.00 L tank with 50.5 grams of chlorine gas at 365 K is 2.66 atm.

What is pressure?

Pressure can be defined as the force acting prpendicular per unit surface.

To calculate the pressure of chlorine gas, we use the formula below.

Formula:

PV = nRT.................. Equation 1

Where:

P = PressureV = Volumen = number of moles of chlorine gasR = Molar gas constantT = Temperature

Make P the subject of the equation

P = nRT/V............ Equation 1

From the question,

Given:

T = 365 KR = 0.0821 L.atm.K⁻¹.mol⁻¹V = 8 Ln = 50.5/(35.5×2) = 0.711 moles

Substitute these values into equation 2

P = (0.0821×365×0.711)/8P = 2.66 atm

Hence, The pressure in the 8.00 L tank with 50.5 grams of chlorine gas at 365 K is 2.66 atm.

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what is the result of cell division that includes mitosis?
A. new cells with different chromosomes
B. four cells with new chromosomes
C. two identical new cells
D. one genetically different cell

Answers

Answer:

I think C is the answer

Explanation:

because Mitosis results in two identical daughter cells......

Solid calcium carbonate reacts with hydrochloric acid, forming aqueous calcium chloride, carbon dioxide
gas, liquid water

help balance

Answers

Answer:

When hydrochloric acid comes into contact with calcium carbonate, the following chemical reaction ensues: CaCO3 + 2HCl → CaCl + CO2 + H2O, which provides acid neutralization alongside the formation of byproducts

Answer:

C) liquid

Explanation:

edge 2023

What is the definition of genetic trait

Answers

The genetic constitution of an individual, group, or class.

Explanation:

transmission of mechanisms of inherited characteristics of organisms

Answer:a trait that can be passed down is within your gens Evan if you don’t show the trait you still have the ability to pass it down

Explanation:

What is the boiling point of water at standard atmospheric pressure?

Answers

Answer:

about 100 degrees Celsius

Explanation:

i dont cap

The main purpose of the endocrine system is to produce:
A.
white blood cells.
B.
hemoglobin.
C.
neurons.
D.
hormones.

Answers

Answer:

hormones or D

Explanation:

:-)

Answer:

D. Hormones

Explanation:

Endocrine glands release hormones into the bloodstream. This lets the hormones travel to cells in other parts of the body.

What is another name for a Grasshopper?

Answers

Answer:

The scientific name of the grasshopper is Caelifera.

Explanation:

hope this helps.

Answer:

caelifera

Explanation:

that’s the scientific name >_<

the thermal energy of the higher-temperature object as does the temperature?

Answers

Answer:

Temperature is the average kinetic energy of particles of an object. Warmer objects have faster particles and higher temperatures. If two objects have the same mass, the object with the higher temperature has greater thermal energy. Temperature is measured with a thermometer.

Translate the world equation in skeleton equation and balance them
(I) Hydrogen+chlorine= Hydrochloric acid
(II) potassium+chloride= potassium chloride+oxygen ​

Answers

Answer:

The balanced equation is: H2 (g) +Cl2 (g) →2HCl (g)

Explanation:

Balancing chemical equation refers to balancing the stoichiometric coefficients on the reactants and products side. This must be done as the chemical equation obeys the law of conservation of mass and momentum.

The representation of a chemical reaction in the form of substances is known as a chemical equation. The equation in which the number of atoms of all the molecules is equal on both sides of the equation is known as a balanced chemical equation. The Law of conservation of mass governs the balancing of a chemical equation.

Given chemical equation

The balanced chemical equation for the hydrogen + chlorine -> Hydrogen Chloride.

H2 + Cl2 → 2HCl

The equation is balanced as on the reactants side there are two hydrogens present and the same on the products side. For chlorine as well the same thing goes two chlorine atoms on the reactants side and two on the products side.

" The use of insecticide is not an interest but an obligation". justify the statement​

Answers

Answer:

Insecticides are not good for health. Their use is harmful to other animals, birds and humans. But, without their use, it is not possible to grow the required amount of food. So, "the use of insecticide is not an interest, but an obligation".

In order to make a covalent bond, the orbitals on each atom in the bond must overlap.

Answers

Answer:

true

Explanation:

Covalent bonds are formed through the overlap of half-filled valence orbitals. Because of the overlapping, it is most probable that electrons are located within the region of the bond.

In order to make a covalent bond, the orbitals on each atom in the bond must overlap. Therefore, the given statement is true.

What is covalent bond?

A covalent bond is an electron exchange usually results in the production of electron pairs between atoms. These electron couples are referred to as bonding pairs as well as sharing pairs. Covalent bonding seems to be the permanent equilibrium of atoms' forces of attraction versus attraction when atoms share electrons.

Because to electron sharing, each atom in a number of molecules can achieve the corresponding amount of the valence shell, resulting inside a stable electronic configuration. In organic chemistry, covalent bonds are far more common than ionic ones. In order to make a covalent bond, the orbitals on each atom in the bond must overlap.

Therefore, the given statement is true.

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An impure sample of potassium hydrogen phthalate was titrated to determine the percent composition KHP. What is the percentage of potassium hydrogen phthalate if 2.81 g of the mixture required 35.61 mL of 0.152 mol/L NaOH to reach the end point

Answers

For an impure sample of potassium hydrogen phthalate, the percentage of potassium hydrogen phthalate is

m'=39.3%

What is the percentage of potassium hydrogen phthalate if 2.81 g of the mixture required 35.61 mL of 0.152 mol/L NaOH to reach the end point?

Generally, the equation for the mol base  is mathematically given as

mol base = M*V

mol base = 0.152*35.61

mol base = 5.41272 mmol

In conclusion

mass = mmol/1000*MW

m== 5.41272 /1000*204.22

m= 1.1053 g of KHP

Hence, m'=39.3%

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the number of cobalt atoms in 0.00103 mole of cobalt​

Answers

It’s is 2.75 g of cobalt
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