how can i find the sum of 18236.34+3244213-7654=

This problem has two parts; the first one asking for the concentration of NaBr given both its mass and volume and the second one asking for its volume given both mass and concentration. The answers turn out to be 0.158 M and 211 mL.

In chemistry, the use of units of concentration depends on both the substances to analyze and their amounts. In such a way, for molarity, one needs the following relationship between the moles of solute and volume of solution:

\(M=\frac{n}{V}\)

Thus, for the first part of the problem we first calculate the moles in 2.60 g of NaBr via its molar mass:

\(2.60g*\frac{1mol}{102.89g} =0.0253mol\)

Next, we convert the 160. mL to L by dividing by 1000 in order to obtain 0.160 L to subsequently calculate the molarity:

\(M=\frac{0.0253mol}{0.160L}=0.158M\)

Next, since the moles remain the same and for the second part we are asked for the volume given the concentration, one can solve for the volume so as to obtain:

\(V=\frac{n}{M} =\frac{0.158M}{0.120mol/L}\\ \\V=0.211L\)

That in milliliters turns out to be:

\(V=0.211L*\frac{1000mL}{1L}=211mL\)

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A substance that changes in a chemical reaction and is represented by the reaction arrow on the left side of a chemical equation.

A substance formed in a chemical equation. and written on the right side of the reaction arrow in a chemical equation is referred to as a product. According to the law of conservation of matter, matter cannot be created or destroyed. The number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products in chemical equations. The atoms and molecules that interact in a chemical reaction are referred to as reactants. The atoms and molecules produced by a chemical reaction are referred to as products.

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Answer: fluted filter paper has more surface area suitable for collecting solid

Explanation:

Answer:

false

Explanation:

salt water cannot be classified as a substance because it's composition can vary

If a titration net volume should be 20. 00 ml and a student accidentally goes one drop past the endpoint (~0. 05 ml),then the percent error is 0.25%.

Percent error is defined as the difference of experimental value and theoretical value and measures the accuracy of the result found. The greater the error, lesser is the accuracy and vice versa.

Vd = 1mL/20 drops

where,

Vd is volume of one drop

Vd = 0.05mL

Error is defined as the ratio of change in volume divided by real volume.

e(%) = {(Vr-Vt) /Vt}×100

where,

Vr = real volume

Vd = theoretical volume

e(%) = {((20+0.05) -20) /20} × 100

e(%) = 0.25%

Thus, we find that the percent error on adding one drop is 0.25%.

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The weight of magnesium chloride required to prepare the 200 ml solution that is 5.0 M is approximately 48 grams.

To calculate the weight of magnesium chloride (\(MgCl_{2}\)) required to prepare a 200 ml solution that is 5.0 M, we need to use the formula: Weight (in grams) = Volume (in liters) × Concentration (in moles/liter) × Molecular Weight (in grams/mole)

First, we convert the volume from milliliters to liters by dividing it by 1000: Volume = 200 ml ÷ 1000 = 0.2 L. Next, we multiply the volume, concentration, and molecular weight: Weight = 0.2 L × 5.0 mol/L × 95.3 g/mol = 47.65 grams

Rounding to the nearest whole number, the weight of magnesium chloride required to prepare the 200 ml solution that is 5.0 M is approximately 48 grams.

This calculation ensures that the desired concentration is achieved by accurately measuring the appropriate amount of magnesium chloride, taking into account its molecular weight and the desired volume of the solution.

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The electron could be excited to a higher energy level and then returned to ground state as shown in the image attached.

According to the Bohr model of the atom, electrons are arranged in energy levels. The electrons that are in the lower energy levels then to absorb energy and move up to the excited states which are higher energy levels which is the crux of the model here.

Subsequently, the electron that was excited would drop down to the ground state and then loose the energy that was absorbed during excitation in the form of a visible light.

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Anser d last awnser

Explanation:

Nitrogens are ranked in decreasing order of basicity as follows: nitrogen 19 > nitrogen 13 > nitrogen 7.

To rank the nitrogens in order of basicity, we need to consider their electronic environment and ability to accept protons (H+).

The basicity of nitrogen increases with the availability of lone pair electrons. In this case, nitrogen 19 is most basic because it is attached to an electron-withdrawing group (a carbonyl group) that reduces the electron density on the nitrogen atom, making it more willing to accept a proton.

Nitrogen 13 is next in line because it has two alkyl groups attached, which provides some electron density and increases its basicity. Finally, nitrogen 7 is the least basic because it is part of an aromatic ring, which delocalizes the electrons and makes it less available to accept protons.

Therefore, the ranking of nitrogens in order of basicity is:
Nitrogen 19 > Nitrogen 13 > Nitrogen 7

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The ranking of the nitrogens in order of basicity would be: Nitrogen 7 < Nitrogen 13 < Nitrogen 19.

To rank the nitrogens in order of basicity, we need to determine which nitrogen atom is most likely to donate its lone pair of electrons to accept a proton. This is generally determined by the electron density surrounding the nitrogen atom, with more electron-dense nitrogen atoms being more basic.

In this case, without knowing the specific compound, it's difficult to make a definitive determination. However, we can make some general assumptions based on the position of the nitrogen atoms within the molecule.
Nitrogen 7 is likely the least basic of the three, as it is closer to the center of the molecule and may have less electron density surrounding it.

Nitrogen 19, on the other hand, is likely the most basic, as it is located on the edge of the molecule and may have more electron density surrounding it.
Nitrogen 13 falls somewhere in between, as it is not as central as nitrogen 7 but not as peripheral as nitrogen 19.

Therefore, the ranking of the nitrogens in order of basicity would be: Nitrogen 7 < Nitrogen 13 < Nitrogen 19.

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The solubility of calcite decreases with increasing water temperature, this can help in washing clothes as the calcite will get deposited at the bottom because of its less solubility and clothes can be washed easily.

Calcite also known as calcium carbonate is nearly insoluble in water because of the strong electrostatic force of attraction that exists in the calcium carbonate molecules. Thus, when a system's water temperature rises, less carbon dioxide (CO₂) dissolves in the water, which leads to calcite precipitating. The degree of solubility of calcium carbonate falls as the water temperature rises.

Hence, when the temperature rises the calcite precipitates and thus gets deposits at the bottom, and hence for hard water circumstances, which have an acidic environment, calcium carbonate soaps are excellent. To eliminate undesirable, intractable stains, calcium carbonate generates an alkaline medium that is perfect for detergents. Thus clothes are washed easily.

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The ion responsible for the solution being basic or acidic in NaC2H3O2 is the Acetate ion.

The Acetate ion, CH3COO- is responsible for the solution being acidic or basic in NaC2H3O2.

NaC2H3O2 is also known as Sodium Acetate. It is a common compound in the laboratory that is colorless, deliquescent, and odorless. It dissolves easily in water, and its pH varies depending on the solution's acetate and acetic acid concentration.

Because acetate ion is a weak base, its solution has a higher pH than a solution containing just the acid. The buffer capacity of a solution of the salt NaC2H3O2 (Acetate ion) is dependent on the concentration of the salt and the pH of the solution. A solution with a pH of 7.0 and a 0.1 M NaC2H3O2 concentration would have a buffer capacity of 1.4. A solution with a pH of 5.0 and the same salt concentration would have a buffer capacity of 13.0.The equation for the dissociation of sodium acetate is given below:

NaC2H3O2 ⇌ Na+ + C2H3O2-

We can say that the solution is basic if the pH is greater than 7, acidic if the pH is less than 7, and neutral if the pH is equal to 7.

Hence, the Acetate ion is responsible for the solution being basic or acidic in NaC2H3O2.

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The final concentration of sucrose is 0.044 M.

To find the final concentration, we will apply the concept of molarity

Initial volume(v1)= 75.00 ml= 75x10⁻³

Final volume ( v2)= 350.00 ml= 350x10⁻³

Initial concentration= 0.250 M

Molarity= moles/volume

0.25= moles/ v1

0.25= moles/ 75x10⁻³

moles= 0.01875

The moles will remain the same after dilution

final concentration= 0.01875/ 425x10⁻³

=0.044 M

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The molarity of the solution is 3.11 M, which means that there are 3.11 moles of KCI present in one liter of the solution.

The molarity of a solution is defined as the number of moles of solute present in one liter of the solution. To calculate the molarity of the given solution, we need to first determine the number of moles of KCI present in the solution. We can use the formula:
Number of moles of solute = Mass of solute / Molar mass of solute
The molar mass of KCI is 74.55 g/mol (39.10 g/mol for potassium and 35.45 g/mol for chloride). Therefore, the number of moles of KCI present in the solution is:
Number of moles of KCI = 128 g / 74.55 g/mol = 1.717 moles
Now we can use the formula for molarity:
Molarity = Number of moles of solute / Volume of solution in liters
We need to convert the volume of solution from milliliters to liters by dividing by 1000:
Volume of solution = 552 mL / 1000 mL/L = 0.552 L
Therefore, the molarity of the solution prepared using 128 grams of KCI with a volume of 552 mL is:
Molarity = 1.717 moles / 0.552 L = 3.11 M

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Answer:

it would increase to twice what it was

Answer:

what is the question

Explanation:

Answer:

Um what do u want us to check?

Explanation:

A given substance that has a melting point of -7C and a boiling point of 59C exists as a liquid at room temperature conditions.

The states of matter refer to the separation of the molecules of a given material in certain temperature conditions.

The states of the matter are three and include the gaseous state, liquid state and solid-state.

In conclusion, a given substance that has a melting point of -7C and a boiling point of 59C exists as a liquid at room temperature conditions.

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To calculate the mol fraction of benzene in the vapor, we first need to calculate the total moles of the mixture. Since 2 moles of benzene are mixed with 3 moles of toluene, the total moles of the mixture will be 2 + 3 = 5 moles.

Next, we need to calculate the moles of benzene in the vapor. This can be done using Raoult's Law, which states that the partial pressure of a component in a mixture is equal to its mole fraction times its vapor pressure at that temperature.
Assuming that the vapor pressure of benzene and toluene are known at the given temperature, we can use Raoult's Law to calculate the partial pressure of benzene in the vapor.
Once we have the partial pressure of benzene, we can use Dalton's Law of Partial Pressures to calculate the total pressure of the vapor.
Finally, we can calculate the mol fraction of benzene in the vapor by dividing the partial pressure of benzene by the total pressure of the vapor.
Since the question does not provide information about the temperature or vapor pressure of the components, it is not possible to provide a numerical answer. However, the above steps can be followed to calculate the mol fraction of benzene in the vapor under given conditions.
We need to use Raoult's Law and Dalton's Law of Partial Pressures to calculate the mol fraction of benzene in the vapor. However, the specific numerical answer will depend on the temperature and vapor pressure of the components.

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Answer:

Explanation:

Because of the decrease in the oxidation state.

Answer:

The molar mass of sodium is 22.990 g/mol.

The molar mass of chlorine is 35.45 g/mol.

To calculate the molar mass of NaCl, we need to multiply the subscript of each element times its molar mass, then add them together. In this case since there is no subscript, it is understood to be

( 1 × 22.990 g/mol ) + ( 1×35.45 g/mol ) = ?

22.990 g/mol + 35.45 g/mol = ?

58.44 g/mol = ?

Hope this helped!

Have a supercalifragilisticexpialidocious day!

Answer: the way root cells reproduce to increase root length

Explanation:

Rudolf Ludwig Carl Virchowas known as the founder of social medicine and also the father of modern pathology.

Virchow posited that all cells are gotten from already existing cells and he used this in his work towards cellular pathology, as it was made clear that diseases takes place at the cellular level. He posited that the cells that are malfunctioning cause diseases.

Based on the above analysis, the image that Tumu would most likely use in his assignment to feature Rudolf Virchow is the way root cells reproduce to increase root length.

Answer:

the way root cells reproduce to increase root length

Explanation:

Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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The missing variable of (⁻¹) is bromine.

Let the missing variable be X.

No. of electrons in the monoatomic anion (X⁻¹ )= 36

No. of electrons in the monoatomic atom (X) = 35

Atomic No. = No. of protons = No. of electrons in neutral atom = 35

Mass No. = No. of protons + No. of neutrons

               = 35 + 45 = 80

Hence, the element must be Br as its mass no is 80 and atomic no is 35.

And the ion is bromide ion or Br⁻¹ ion. It is an anion which gains an electron to achieve octet.

X → Br and X⁻¹ → Br⁻¹

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Answer:

I got you..you need help but with which question?

Explanation:

Have a great day!

Answer:

Nucleic acid

Explanation:

Because nucleic acid is the molecule that carries genetic information because it helps to develop or functioning an organism

Answer: Different ways of distributing energy have different short-term and long-term environmental consequences.

Explanation:

Due to the big issue of some energy sources being non-renewable and some being renewable, lawmakers have a lot on their plate. Non-renewable sources of energy are harmful to the environment, but they work the best. Renewable sources of energy cost a lot and work, but they require a lot of effort.

Dimensional analysis is a mathematical technique that involves analyzing the dimensions of physical quantities in order to determine the relationship between them.

It involves looking at the units of measurement for each quantity and using them to establish the relationship between them. This is an important technique in many fields of science, including physics, chemistry, and engineering. To perform dimensional analysis, you must first identify the physical quantities involved in the problem. Then, you must determine the units of measurement for each quantity. Once you have done this, you can use the principles of dimensional analysis to establish the relationship between the quantities. For example, let's say you are trying to find the relationship between the velocity of an object and its acceleration. You would first identify the physical quantities involved - velocity and acceleration. You would then determine the units of measurement for each quantity - velocity is typically measured in meters per second (m/s), while acceleration is typically measured in meters per second squared (m/s²).

Using the principles of dimensional analysis, you could then establish the relationship between velocity and acceleration by dividing the units of measurement for velocity by the units of measurement for acceleration. This would give you the dimensions of the relationship between the two quantities - in this case, meters per second divided by meters per second squared, or simply 1/second. In summary, dimensional analysis is a useful technique for analyzing the relationship between physical quantities. By understanding the dimensions of each quantity, you can establish relationships and solve problems more effectively.

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Answer:

B

Explanation:

Condensation happens when there is a drop in temperature. As the heat decreases, the speed that molecules move also decreases. Furthermore, as a gas turns into a liquid, the molecules become more packed together, making the volume decrease, and the shape to become more defined.

Explanation

NH4Cl(s) = NH4+(aq) + Cl-(aq) AH = +3.5 kcal/mole

We have some changes that shift the equilibrium to the right, according to Le Châtelier's principle.

I will write some of them:

By Adding amount of NH4Cl or by increasing the temperature because according to the heat of the reaction this is an endothermic reaction.

Answer: Increasing the temperature of the system.

Explanation:

Causes of climate change are:

1.)Smoke from Vehicles and industrial activities

2.) Burning of polythenes.

3.) Because of green house effect

Effects are:

1.) Extinction of birds,plants and animals

2.) Melting of glaciers

3.) Rise in global temperature

Answer:

B.) No, because the coefficients could be reduced to 2,1, and 3.

Explanation:

The equation is not in its lowest molar ratio form. In this case, all of the coefficients can be divided by 2 and still result in whole numbers.

As such, the correct balanced equation is:

2 NH₃ ----> N₂ + 3 H₂