A solution is made by dissolving
4.0 g of potassium chloride in water
a final volume of 78.9 mL solution.
What is the weight/weight % or the
percent by mass of the solute?
Use 1.00 g/mL for the density of the solution.

Answer:

If n = 4, then the possible values of 1 and m depend on the equation or expression being used. Without more information, it is impossible to determine what the possible values of 1 and m might be. Can you please provide more context or information about the problem you are trying to solve?

As per chemical changes, a color change can be seen when a substance change into a new substance.

Chemical changes are defined as changes which occur when a substance combines with another substance to form a complete  new substance.Alternatively, when a substance breaks down or decomposes to give new substance it is also considered to be a chemical change.

There are several characteristics of chemical changes like those of  change in color, change in state , change in odor and even change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

Learn more about chemical changes,here:

https://brainly.com/question/23693316

#SPJ1

Answer:

Pure substance

Explanation:

A material that consists of only one type of element or compound is regarded as a pure substance.

A pure substance has the following properties;

Compounds and elements are pure substances too.

Have a wonderful day :) thanks for the points

Answer:

True

Explanation:

The specific heat capacity of any substance is defined as the amount of heat required to raise the temperature of a body by 1°C.

Hence, if the same magnitude of thermal energy is supplied to two objects of which one has a high specific heat capacity and the other has a low specific heat capacity, the object having a high specific heat capacity will have its temperature raised far more than the object with low specific heat capacity.

Answer:

t? im pretty sure have a good day

Answer:

C₁₅N₃H₅

Explanation:

Let's assume we have 240 g of the dye (1 mol), in that case we'd have:

Now we convert the masses of each element into moles, using their respective molar masses:

Thus the molecular formula is C₁₅N₃H₅.

The percent yield : 79.9%

Percent yield is the comparison of the amount of product obtained from a reaction with the amount you calculated

General formula:

Percent yield = (Actual yield / theoretical yield )x 100%

An actual yield is the amount of product actually produced by the reaction. A theoretical yield is the amount of product that you calculate from the reaction equation according to the product and reactant coefficients

Reaction

Fe(s)+S(s)⇒FeS(s)

The reaction produces 6.29 g of iron(II) sulfide⇒an actual yield

The maximum  amount that can be produced is 7.87 g ⇒ A theoretical yield

\(\tt \%yield=\dfrac{actual}{theoretical}\times 100\%\\\\\%yield=\dfrac{6.29}{7.87}\times 100\5=79.9\%\)

Carbon atoms 1 - 7 are all sp2 hybridized carbon atoms while carbon 8 is sp3 hybridized.

The term hybridization has to do with the mixing of atomic orbitals in order to obtain molecular orbitals that are of appropriate energy and can be able to participate in bonding. The idea of hybridization is rooted in the valence bond theory.

Now we have the compound as has been shown in the image attached to the question, there are carbon atoms that have been numbered from one to eight. We are to identify the hybridization pattern in each atom.

We can see that atoms 1 - 7 are all sp2 hybridized carbon atoms while carbon 8 is sp3 hybridized.

Learn more about hybridization:https://brainly.com/question/14140731

#SPJ1

Answer:

2nd answer is correct. Hope it helped you!

Answer:

yiur mom

Explanation:

d

KH2PO4 is a more suitable choice as a buffer because it has a greater buffering capacity due to the presence of the weak acid and its conjugate base.

KHPo4 is not considered an effective buffer compared to KH2PO4 due to its limited buffering capacity. The effectiveness of a buffer is determined by the concentration and dissociation properties of its conjugate acid-base pair.

KH2PO4 is a salt composed of the weak acid H2PO4- and its conjugate base HPO4^2-. In an aqueous solution, KH2PO4 can dissociate to release H+ ions from the H2PO4- component, which acts as a weak acid, and the HPO4^2- component can accept H+ ions, acting as a weak base. This allows KH2PO4 to effectively resist changes in pH when small amounts of acid or base are added to the solution.

On the other hand, KHPo4 consists of the strong acid H3PO4 and the weak base HPO4^2-. H3PO4 fully dissociates in water, providing a large concentration of H+ ions, making it difficult for the HPO4^2- to effectively act as a base and maintain pH stability.

Therefore, KH2PO4 is a more suitable choice as a buffer because it has a greater buffering capacity due to the presence of the weak acid and its conjugate base.

For more question on conjugate

https://brainly.com/question/14684465

#SPJ8

We are given:

P1 = 1 atm                 P2 = 3 atm

T1 = 300 K               T2 = 600 K

V1 = 6 L                    V2 = v L

Finding the final Volume:

From the ideal gas equation:

PV = nRT

since in the given scenario, the universal gas constant (R) and number of moles(n) are constant

So, for both the cases, the value of n*R will be a constant k

Hence, we can write that:

PV / T = k        [where k is a constant]

Since the constant 'k' is the same for both the cases, we can write that:

P1V1 / T1 = P2V2 / T2

replacing the variables

1 * 6 / 300 = 3 * v / 600

1/50 = v / 200

v = 200/50

v = 4 L

Therefore, the volume of the gas at 600K and 3 atm will have a volume of 4 L

Answer:

a.) (aq)

Explanation:

(aq) means aqueous

so its in a solvent

Answer:

See explanation.

Explanation:

Hello there!

In this case, for this titration problem, we first need to set up the undergoing chemical equation between barium chloride and hydrochloric acid:

\(2HCl+Ba(OH)_2\rightarrow BaCl_2+2H_2O\)

Which occurs in a 2:1 mole ratio of acid to base and thus, we can write the following:

\(2n_{base}=n_{acid}\)

Which can be written in molarities and volumes:

\(2M_{base}V_{base}=M_{acid}V_{acid}\)

And we solve for the molarity of the acid:

\(M_{acid}=\frac{2M_{base}V_{base}}{V_{acid}}\)

Unfortunately, the molarity of the base was not given:

"The molarity of an aqueous solution of hydrochloric acid, , is determined by titration with a M barium hydroxide, , solution. If 31.2 mL of barium hydroxide are required to neutralize 15.4 mL of the acid, what is the molarity of the hydrochloric acid solution?"

Yet we can assume an arbitrary value, say 1.0 M in order to show you the solution so that you can modify it according to your given value:

\(M_{acid}=\frac{2(1.0M)(31.2mL)}{(15.4mL)}=4.05M\)

So you just need to modify the (1.0 M) by the actually given molarity of the acid.

Regards!

Answer:

1 volt

Explanation:

Use Ohm's Law:

V = IR

V = (0.05A)(20 ohms) = 1 volt

An electrical circuit has a resistance of 20 ohms and a current of 0.05A. The voltage is applied in this circuit is 1 volt.

Ohm's Law states that the current in a circuit is equal to the potential difference divided by the resistance of the circuit. It is represented by  V = IR, where V is the voltage difference, I is the current in amperes, and R is the resistance in ohms.

The law can be used to perform calculations such as determining the value of resistors or current in a circuit, or measuring voltage. Furthermore, Ohm's law assists us in describing how current flows through materials such as electrical wires, etc.

By using  Ohm's Law we get,

V = IR

V = (0.05A)(20 ohms)

= 1 volt

Thus, The voltage is applied in this circuit is 1 volt.

To learn more about the Ohm's Law, follow the link;

https://brainly.com/question/1247379

#SPJ6

The right brain part of the brain is affected by a smell, a song, or a photograph.

The right brain is more intuitive and visually oriented. It is occasionally referred to as the analog brain. It thinks less logically and with more creativity. According to out-of-date research by Sperry, the right brain aids in creativity.

Posterior parietal cortex of the parietal lobe of the brain mainly deals with the photographs.

The olfactory bulb, a structure in the front of the brain, processes smells before sending data to other regions of the body's central nervous system.

To know more about smelling part of brain visit

https://brainly.com/question/3655509

#SPJ1

The right brain part of the brain is affected by a smell, a song, or a photograph.

What is Right Brain?

The right brain is more intuitive and visually oriented. It is occasionally referred to as the analog brain. It thinks less logically and with more creativity. According to out-of-date research by Sperry, the right brain aids in creativity.

Which part of brain deals with photograph?

Posterior parietal cortex of the parietal lobe of the brain mainly deals with the photographs.

Which part of brain deals with Smell?

The olfactory bulb, a structure in the front of the brain, processes smells before sending data to other regions of the body's central nervous system.

Answer: 1 mL = 1 cm^3

Explanation:

This is a common conversion, 1 mL equals 1 cm^3. They are the same volume.

The true statements about catalysts are the statement 1,2 and 3.

1. Catalysts increase the rate of reaction: Catalysts facilitate chemical reactions by providing an alternative reaction pathway with lower activation energy. They enhance the rate of the reaction without being consumed in the process.

2. Catalysts behave as reactants in the reaction mixture: Catalysts participate in the reaction by interacting with the reactants. They form temporary bonds with the reactant molecules, leading to the formation of an intermediate complex that ultimately results in the desired products.

3. Catalysts decrease the activation energy of a reaction: Catalysts lower the energy barrier required for a reaction to occur by providing an alternative pathway with a lower activation energy. This enables the reactants to overcome the energy barrier more easily, thus increasing the reaction rate.

4. Catalysts show no physical change at the end of the reaction: Catalysts are not consumed or permanently altered in the reaction. They remain chemically unchanged and are available to participate in subsequent reaction cycles.

The statement "Catalysts are required in large concentrations in a reaction" is false. Catalysts work effectively even in small concentrations, as their role is to facilitate the reaction rather than being directly involved in the stoichiometry of the reaction.

For more questions on catalysts, click on:

https://brainly.com/question/12507566

#SPJ8

The solution has a molarity of 0.0924 M.

The number of moles of solute per litre of solution is known as molarity.. For instance, water is both the solution and the solute when table salt is dissolved in it. Each mole of sodium chloride weighs 58.44 grammes. 58.44 grammes of sodium chloride are dissolved in one litre of water to produce one molar solution, or 1M.

Moles of solute per litre of solution is known as molarity (M).

Given: moles of NH3 = 0.355, volume of solution = 3.84 L

Molarity = 0.355 moles / 3.84 L = 0.0924 M

Therefore, the molarity of the solution is 0.0924 M.

To know more about molarity visit:-

https://brainly.com/question/8732513

#SPJ1

Answer: The burning of fossil fuels releases carbon dioxide, methane and other greenhouse gases into the atmosphere. These gases trap heat in the atmosphere, leading to a gradual increase in global average temperatures, known as global warming. This phenomenon has serious impacts on our environment and ecosystems, including extreme weather events and rising sea levels.

Answer:

762.60 g

Explanation:

In order to convert from moles of a substance into grams, we need to multiply the number of moles by the substance's molar mass:

With the above information in mind, we can use the data given by the problem and calculate how many grams are there in 12 moles of Cu:

Answer:

Removal of metallic substances from the eye by doctors.

Explanation:

Doctors use magnets to remove metallic material inside the patients eyes.

Answer:

Explanation:

it's helpful

The heat absorbed by the ice is given by the formula: heat = mass * specific heat capacity * change in temperature.

The mass of the ice is 165g. The specific heat capacity of water is 4.18 J/g°C. The change in temperature is 37.0°C - 0.0°C = 37.0°C.

The heat absorbed by the ice is: 165g * 4.18 J/g°C * 37.0°C = 29,894.5 J

To convert from J to kcal: 1 kcal = 4184 J. Therefore,

29,894.5 J / 4184 J/kcal = 7.13 kcal

The heat absorbed by the ice is 7.13 kcal

Approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

To determine the number of molecules of HCl required to form 34.52 g of MgCl₂, we need to use the molar mass and stoichiometry of the balanced equation:

Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)

The molar mass of MgCl₂ is 95.21 g/mol.

First, we need to calculate the number of moles of MgCl₂ formed:

Moles of MgCl₂ = mass of MgCl₂ / molar mass of MgCl₂

Moles of MgCl₂ = 34.52 g / 95.21 g/mol

Moles of MgCl₂ = 0.363 mol

According to the balanced equation, the stoichiometric ratio between HCl and MgCl₂ is 2:1. Therefore, the moles of HCl required can be calculated as follows:

Moles of HCl = 2 * Moles of MgCl₂

Moles of HCl = 2 * 0.363 mol

Moles of HCl = 0.726 mol

To calculate the number of molecules, we need to use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of molecules of HCl = Moles of HCl * Avogadro's number

Number of molecules of HCl = 0.726 mol * 6.022 x 10^23 molecules/mol

Number of molecules of HCl = 4.37 x 10^23 molecules

Therefore, approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

For more such questions on molecules

https://brainly.com/question/1351818

#SPJ8

Answer:

✨Gravity✨ hope this helps

Explanation:

Answer:

a) 2 (H+) ions

b) 1 (SO3²-) ions

c) 1.36 × 10^-22 grams.

Explanation:

According to this question, sulfurous acid has a chemical formula; H2SO3. It is made up of hydrogen and sulfite ion. Hydrogen ion (H+) is the cation while sulfite ion (SO32-) is the anion.

Based on the chemical formula, there are 2 moles of hydrogen ions that reacts with 1 mole of sulfite ion as follows:

2H+ + SO3²- → H2SO3

Hence;

- there are 2 hydrogen ions (2H+) present in H2SO3.

- there is 1 sulfite ion (SO3²-) present in H2SO3.

c) The mass of one formula unit of H2SO3 is calculated thus:

= 1.008 (2) + 32.065 + 15.999(3)

= 2.016 + 32.065 + 47.997

= 82.08 a.m.u

Since, 1 gram is = 6.02 x 10^23 a.m.u

82.08 a.m.u = 82.08/6.02 × 10^-23

= 13.6 × 10^-23

= 1.36 × 10^-22 grams.

Answer:

Anaerobic metabolism

Overview. Anaerobic metabolism is the creation of energy through the combustion of carbohydrates in the absence of oxygen. This occurs when your lungs cannot put enough oxygen into the bloodstream to keep up with the demands of your muscles for energy.

Explanation: