Answer:
Here are the chemical reactions for the formation of the respective Grignard reagents from the reaction of magnesium with the following organic halides:
Iodomethane:Mg + CH3I → CH3MgI
Bromobenzene:Mg + C6H5Br → C6H5MgBr
Chloropropane:Mg + C3H7Cl → C3H7MgCl
Grignard reagents are formed when magnesium metal is reacted with an alkyl halide. The magnesium metal reacts with the halide to form a magnesium halide salt, and the alkyl group is displaced from the halide to form the Grignard reagent.
The Grignard reagent is a powerful nucleophile and can be used to synthesize a variety of organic compounds.
dry ice is solid carbon dioxide. represent carbon dioxide in the following three ways, symbolic, particulate. and macroscopic
In symbol form, ice is depicted as CO2, in particle form, as molecules of CO2 packed closely together, and in macroscopical form, as a white, crystalline substance that sublimates from a solid to a gas.
How is dry ice defined as solid carbon dioxide?Because the gas when it solidifies resembles ice, ice ice is actually just carbon dioxide that has been solidified. Unlike regular ice, it instantly transforms into CO2 gas instead of melting into a liquid.
Why is dry ice a good illustration of sublimation?Solid carbon dioxide is sometimes referred to as "dry ice." That's because when something warms up and changes state, it doesn't just dissolve into a liquid. Instead, it skips the liquid step and transforms right into a gas.
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The acid should be handled with great care why?
Answer:
Acids are corrosive substances that can be dangerous if not handled properly. They have a pH level of less than 7, and can cause chemical burns, skin and eye irritation, respiratory problems, and other health hazards if they come into contact with human tissue. Here are some reasons why acids should be handled with great care:
Corrosive Properties: Acids have the ability to dissolve or corrode many materials, including metals, plastics, and organic compounds. This means that they can cause damage to equipment, clothing, and skin if not handled with care.
Toxicity: Some acids can be toxic if ingested or inhaled, and can cause severe health problems or even death. For example, hydrochloric acid, which is commonly used in industrial settings, can cause severe burns to the skin and respiratory system.
Reactivity: Acids can react with other chemicals to produce hazardous fumes or explosions. For example, when mixed with bleach, hydrochloric acid can produce chlorine gas, which can be deadly if inhaled.
Environmental Concerns: Acids can also have negative environmental impacts if not disposed of properly. They can contaminate waterways and harm aquatic life, and can contribute to air pollution if released into the atmosphere.
Therefore, it is important to handle acids with great care and to follow proper safety procedures when working with them to avoid any negative health, safety, or environmental consequences.
The scientific notation of 45,000
The relative atomic mass of aluminium is 27 and of oxygen is 16. The aluminium ore shown below contains 5.4kg of aluminium and 4.8kg of oxygen. What is the value of y?
Answer:
To find the value of y, we need to use the concept of molar ratios and the mole concept.
First, we need to calculate the number of moles of aluminum and oxygen in the given sample of ore. We can do this by dividing the mass of each element by its respective atomic mass:
Number of moles of aluminum = 5.4 kg / 27 g/mol = 200 moles
Number of moles of oxygen = 4.8 kg / 16 g/mol = 300 moles
Next, we can determine the ratio of the number of moles of aluminum to oxygen in the sample. This ratio is:
Aluminum : Oxygen = 200 : 300
Simplifying this ratio by dividing both sides by 100, we get:
Aluminum : Oxygen = 2 : 3
According to the chemical formula of aluminum oxide (Al2O3), it contains 2 atoms of aluminum for every 3 atoms of oxygen. Therefore, the sample of ore must contain a whole number of units of this chemical formula. Let the number of units of Al2O3 be y.
Then, we can set up the following equation to solve for y:
2 moles of aluminum * y = 200 moles of aluminum
3 moles of oxygen * y = 300 moles of oxygen
Simplifying each equation, we get:
y = 100
y = 100
Since both equations give the same value for y, we can conclude that the sample of ore contains 100 units of Al2O3. Therefore, the value of y is 100.
Ten years ago, a vacant lot in a subdivision was purchased for $30,500. The owner hired a general contractor to build a home on the lot. The contractor charged $375,000. The homeowner is planning to refinance the mortgage. The bank recently appraised the home at $410,000. What is the value of the property?
The value of the property at the end of the given time period is determined as $410,000.
What is the value of the property?The value of the property is the sum of the purchase price of the lot and the cost of building the home, which is:
$30,500 (purchase price of the lot) + $375,000 (cost of building the home) = $405,500
However, the bank has appraised the home at $410,000, which means that the value of the property has increased by $4,500.
Therefore, the value of the property is:
$405,500 (original value) + $4,500 (increase in value) = $410,000.
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3. Use the exponential notation to express the physical quantities
(a) V = 15.50 mL to L (b) m = 5.00 g to g (c) m=2000 g
Scientific notation is a method of expressing numbers that are too large or too tiny to be represented in decimal form because it would need an extremely long string of digits.
What is exponential notation ?Numbers significantly larger or smaller than these are difficult to read and write because it is simple to count the zeros incorrectly. Using exponential notation is easier. Very large numbers can be expressed as an ordinary (fixed point) number, a letter E, and a whole number. The full number indicates how many places to the right the fixed point number's decimal point must be shifted to acquire the same value as an ordinary number.
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Barium – 122 has a half-life of 2 minutes. Suppose you obtain a sample weighing 20.0 g and it takes 10 minutes to set up an experiment. How many grams of Barium – 122 will remain at the point when you begin the experiment?
Please help almost due?
Answer:
-lithium
-atomic number
-mass number
-protons
Explanation:
If 8.50 g of element A reacts with 5.50 g of element B to form compound AB, what mass of AB is formed, if no A or B is left in excess?
Answer:
massR = massP
massA + massB = massAB
18g + 4g = 22g
Explanation:
The diagram below represents a specimen in the low-power field of view of a compound light microscope. If the slide is not moved, which view best represents the way the specimen will look when the high-power objective lens is switched into place?
Coarse and excellent adjustment The coarse adjustment knob solely be used with the lowest electricity objective lens. Once it is in focus, you will only need to use the best focus. Using the coarse center of attention with greater lenses may result in crashing the lens into the slide.
Why does the specimen have to be founded in the field of view on low strength before going to high power?You must have the object situated before you exchange objectives to increase the magnification, because the subject of view turns into smaller; if the object is off to the side, it might also disappear when you go to higher magnification.
When viewing a specimen on a compound light microscope the photograph is right aspect up but reversed True or false?The optics of a microscope's lenses alternate the orientation of the photo that the consumer sees. A specimen that is right-side up and going through proper on the microscope slide will appear upside-down and going through left when considered through a microscope, and vice versa.
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what happens in a synthesis reaction
A 6.55 g sample of aniline (C6H5NH2, molar mass = 93.13 g/mol) was combusted in a bomb calorimeter. If the temperature rose by 32.9°C, use the information below to determine the heat capacity of the calorimeter. 4 C6H5NH2(l) + 35 O2(g) → 24 CO2(g) + 14 H2O(g) + 4 NO2(g)
We must first determine how much heat is produced by the combustion of aniline. According to the chemical equation, 4 moles of aniline react with 35 moles of oxygen to create 4 moles of nitrogen dioxide, 24 moles of carbon dioxide, and 14 moles of water. The mole ratio of aniline to heat emitted is as a result.
How much energy is emitted when one mol is created?When one mole of water is created from hydrogen and oxygen in the opposite reaction (equation d), it exhales 285.8 kJ of energy.
How much heat energy is released when 1.8 g of glucose is burned?
C₆H₁₂O₆(s)+6O₂(g)→6CO₂(g)+6H₂O(l); ΔH = −2900kJ
One mole (about 180g) of glucose burned during combustion, releasing 2900kJ (29001801.8=29kJ) in heat.
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If 4.00 g of the unknown compound contained 0.133 mol of C and 0.267 mol of H. how many moles of oxygen, O
were in the sample?
Express your answer to three significant figures and include the
Answer:
Explanation:
convert to grams
0.133 mol C x 12 = 1.596
0.267 mol H x 1 = 0.267
Now subtract those numbers from the 4.00
4.00-1.596 -0.267 = 2.137 g O
Now convert grams O to moles
2.137 x (1mole O/16 g O) =0.1335625 moles O
3 sig figs = 0.134 moles O
Wind Energy (10 points)
22. Where does wind energy come from? What is a good definition of wind energy?
23. How does wind energy get turned into electrical energy?
24. Name and explain 3 advantages/disadvantages of getting electricity from wind energy compared to using fossil fuels or other alternative energies (specifically include environmental issues that can happen.
25. Find an example in the U.S. that uses wind energy to create electricity?
22. Wind energy comes from the movement of air caused by the uneven heating of the Earth's surface by the sun. As the sun heats up different parts of the Earth's surface, the air above them heats up and rises, creating a low-pressure area
23. Wind energy is converted into electrical energy using wind turbines.
Advantages of wind energy:Wind energy is renewable and does not produce greenhouse gas emissions or air pollutants, making it a clean source of energy.
Wind energy can be produced locally, reducing dependence on foreign oil and creating jobs in the local economy.
Wind turbines have a relatively small land footprint compared to other power sources.
Disadvantages of wind energy:Wind energy can be intermittent and variable, as wind speeds can vary depending on location and time of day.
Wind turbines can have negative impacts on wildlife, particularly birds and bats, and their habitats.
Wind turbines can have visual and noise impacts on nearby communities.
25. One example of wind energy being used to create electricity in the U.S. is the Alta Wind Energy Center in California.
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How many molecules of HCI are in 4.91 L of HCI acid at 25°C if the density equals 1.096 g/ml
To determine the number of HCl molecules in 4.91 L of HCl acid at 25°C, we can use the following steps:
Calculate the mass of the HCl acid in 4.91 L using its density.Convert the mass of HCl acid to the number of moles using its molar mass.Use Avogadro's number to convert the number of moles of HCl to the number of HCl molecules.Calculate the mass of the HCl acid in 4.91 L using its density:[tex]\qquad\sf {Density = \dfrac{mass}{volume}}[/tex]
[tex]\qquad\sf{mass = density \times volume}[/tex]
[tex]\qquad\sf{mass = 1.096 \: g/mL \times 4.91\: L = 5.38\: kg}[/tex]
Convert the mass of HCl acid to the number of moles using its molar mass. The molar mass of HCl is 36.46 g/mol.
[tex]\sf{moles = \dfrac{mass}{ molar\: mass} = \dfrac{5.38\: kg}{36.46\: g/mol} = 147.6\: mol}[/tex]
Use Avogadro's number to convert the number of moles of HCl to the number of HCl molecules. Avogadro's number is [tex]6.02 \times 10^23[/tex] molecules/mol.
[tex]\sf number\: of\: HCl\: molecules = moles \times Avogadro's\: number[/tex]
[tex]\begin{aligned}\sf number\: of\: HCl\: molecules& =\sf 147.6 \: mol \times 6.02 \times 10^23\: molecules/mol \\& =\sf 8.88 \times 10^25\: molecules\end{aligned}[/tex]
Therefore, there are [tex]8.88 \times 10^25[/tex] HCl molecules in 4.91 L of HCl acid at 25°C, assuming the density of the acid is 1.096 g/mL.
[tex]\rule{200pt}{5pt}[/tex]
Hydrogen (10 points)
14. What does using hydrogen as a fuel source mean? How is it combined to create an energy source?
15. Explain where hydrogen is found. What are sources of hydrogen found on Earth?
16. Name and explain 3 advantages/disadvantages of using hydrogen as a fuel source and how it compares to using fossil fuels and other alternative energies (specifically include environmental issues that can happen.
17. What is a fuel cell? How does it work? (include diagram)
Solar Power (10 points)
18. What is a good definition of solar energy?
19. How does a solar cell make electricity? What is it made of?
20. Name and explain 3 advantages/disadvantages about solar energy to heat or produce electricity compared to using fossil fuels or other alternatives (specifically include environmental issues that can happen.
21. Find an example of solar energy being used in the U.S.?
An example of solar energy being used in the U.S is in the heating of swimming pools, and powering of cabins in off grid regions.
Hydrogen and Solar Energy14. Using hydrogen as a fuel source involves using it as a primary energy carrier to power vehicles or generate electricity. It can be combined with oxygen to create water, producing energy in the process. The process of using hydrogen as a fuel source is known as hydrogen fuel cell technology, which involves the conversion of chemical energy into electrical energy.
15. Hydrogen is the most abundant element in the universe but is rarely found in its pure form on Earth. It is usually found in combination with other elements such as oxygen in water, carbon in hydrocarbons, and nitrogen in ammonia. Hydrogen can be extracted from water, natural gas, coal, and biomass through various methods such as steam-methane reforming, electrolysis, and biomass gasification.
16. Advantages of using hydrogen as a fuel source include:
It is a clean energy source that produces no greenhouse gases or air pollutants when burned, emitting only water vapor and heat.It is highly efficient, with a higher energy density than fossil fuels, making it a potent source of energy for transportation and electricity generation.It can be produced from a wide variety of domestic and renewable sources, reducing reliance on imported oil and promoting energy independence.Disadvantages of using hydrogen as a fuel source include:
It is expensive to produce, store, and transport, making it less cost-effective than fossil fuels and other alternative energies.It requires a lot of energy to produce, mainly from fossil fuels, which defeats the purpose of using it as a clean energy source.The infrastructure for hydrogen fuel cell technology is not yet well established, limiting its widespread adoption and use.17. A fuel cell is an electrochemical device that converts chemical energy into electrical energy through a chemical reaction between hydrogen and oxygen. It consists of an anode, a cathode, and an electrolyte, with the hydrogen fuel entering the anode and the oxygen entering the cathode. The hydrogen molecules are split into protons and electrons, with the protons passing through the electrolyte and the electrons flowing through an external circuit, generating electricity. The oxygen combines with the protons and electrons at the cathode, producing water as the only byproduct.
18. Solar energy is a form of renewable energy that is derived from the sun's radiation. It is harnessed through various technologies such as photovoltaics, solar thermal systems, and concentrated solar power to generate electricity, heat water, and power homes and businesses.
19. A solar cell is a semiconductor device that converts sunlight directly into electricity through the photovoltaic effect. It is made of a thin layer of a semiconductor material such as silicon that is treated with impurities to create a p-n junction. When sunlight strikes the cell, it creates an electric field that separates the positively charged holes and negatively charged electrons, generating an electric current.
20. Advantages of using solar energy include:
It is a clean and renewable energy source that produces no greenhouse gases or air pollutants when used.It is becoming more cost-effective, with the cost of solar panels decreasing over time and becoming more efficient.It can be installed on rooftops or in remote areas, reducing the need for extensive power lines and infrastructure.Disadvantages of using solar energy include:
It is dependent on sunlight and may not be available at all times, requiring energy storage or backup systems.It requires large surface areas to generate significant amounts of electricity, making it unsuitable for densely populated urban areas.The production of solar panels requires toxic chemicals and materials that can harm the environment if not disposed of properly.21. An example of solar energy being used in the U.S is in the heating of swimming pools, and powering of cabins in off grid regions.
What is the total number of moles of reactants and products in the
chemical reaction listed below:
2 H₂S +30₂2 H₂O + 2 SO₂
The total number of moles of reactants and products in the chemical reaction given is 9 moles
How do i determine the total number of moles?The total number of mole of reactants and products in the chemical reaction can be obtained as follow:
2H₂S + 3O₂ -> 2H₂O + 2SO₂
The following were obtained from the above equation:
Mole of H₂S = 2 molesMole of O₂ = 3 molesMole of H₂O = 2 molesMole of SO₂ = 2 molesMole of reactants = Mole of (H₂S + O₂) = 2 + 3 = 5 molesMole of products = Mole of (H₂O + SO₂) = 2 + 2 = 4 molesTotal number of moles =?Total number of mole = Mole of reactants + mole of products
Total number of mole = 5 mole + 4 moles
Total number of mole = 9 moles
Thus, we can say that the total number of mole is 9 moles
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Suppose 0.850 L of 0.400 M H₂SO, is mixed with 0.800 L of 0.250 M KOH. What concentration of sulfuric acid remains
after neutralization?
_______ M H₂SO4
Explanation:
The balanced chemical equation for the reaction between sulfuric acid and potassium hydroxide is:
H₂SO4(aq) + 2KOH(aq) → K₂SO4(aq) + 2H₂O(l)
From the equation, we can see that 1 mole of H₂SO4 reacts with 2 moles of KOH. We can use this information to determine the number of moles of H₂SO4 and KOH present in the mixture before neutralization:
moles of H₂SO4 = 0.850 L x 0.400 mol/L = 0.34 mol
moles of KOH = 0.800 L x 0.250 mol/L = 0.20 mol
Since KOH is the limiting reagent, it will be completely consumed in the reaction. The number of moles of H₂SO4 that reacts with the KOH is given by:
moles of H₂SO4 reacted = 2 x moles of KOH = 0.40 mol
The remaining moles of H₂SO4 after neutralization is:
moles of H₂SO4 remaining = moles of H₂SO4 - moles of H₂SO4 reacted
moles of H₂SO4 remaining = 0.34 mol - 0.40 mol
moles of H₂SO4 remaining = -0.06 mol
Since the moles of H₂SO4 remaining is negative, it means that all of the H₂SO4 has reacted with the KOH and there is an excess of KOH. Therefore, the concentration of sulfuric acid remaining after neutralization is 0 M.
What is the ratio of ammonia if the chemical formula is
NH3
Explanation:
The chemical formula NH3 represents ammonia, a colorless gas that is widely used in various industrial and household applications. The formula indicates that one molecule of ammonia contains one nitrogen atom and three hydrogen atoms. Therefore, the ratio of nitrogen to hydrogen in ammonia is 1:3.
This means that for every one nitrogen atom in an ammonia molecule, there are three hydrogen atoms. Alternatively, we can say that the ratio of nitrogen atoms to hydrogen atoms in ammonia is 1:3.
On a distance time graph of an objects motion distance is usually what
4 Read the sentence from the introduction [paragraph 1].
Matter is capable of undergoing changes, which are classified as either physical or chemical.
Which phrase could BEST replace "is capable of undergoing" in the sentence above?
(A) has the knowledge to perform
(B) has the ability to experience
(C) has the experience to recognize
(D) has the opportunity to facilitate
Answer: A
Explanation:
You thought i was feeling you that n was a munch
Moles of water that were produced from the com combustion
The chemical of hydrogen has 0.0426 moles per y.
What is a combustion reaction equation example?A compound combines with an oxidising element, such as oxygen, in a complete combustion reaction, and the products are compounds of each element in the fuel and the oxidising element. This reaction is exothermic. For instance, Carbon dioxide(g) + 2water(g) + heat + light = Methane(g) + 2Oxygen(g).
Molar mass of water (Water) = 2(1.008 g/mol) + 1(15.999 g/mol) = 18.015 g/mol
moles of water = mass of water collected / molar mass of water
moles of water = 0.384 g / 18.015 g/mol
moles of water = 0.0213 mol
Therefore, 0.0213 mol of water were produced from the combustion of the compound.
To determine the moles of hydrogen in the compound, we need to use the balanced chemical equation for the combustion of hydrocarbons:
(x + y/4 - z/2)Oxygen → xCarbon dioxide + y/2water
From the equation, we can see that each mole of water produced in the combustion reaction corresponds to y/2 moles of hydrogen in the original compound.
Since we now know that 0.0213 mol of water were produced, we can calculate the moles of hydrogen in the compound:
moles of hydrogen = (2 mol of water / y mol of hydrogen) x 0.0213 mol of water
moles of hydrogen = 0.0426 mol / y
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Esters, amines, and amides have many uses in medicine. Investigate one of the following drugs further: aspirin, Benadryl, or Tylenol and give its scientific name. What kind of functional groups does it contain?
Esters, amines, and amides have many uses in medicine, and so do carboxylic acids, such as aspirin. Aspirin is the drug that will be investigated further. Its scientific name is acetylsalicylic acid.
What kind of functional groups does Aspirin contain?Acetylsalicylic acid contains two functional groups: a carboxylic acid group (-COOH) and an ester group (-COO-CH₃). The carboxylic acid group is responsible for the acidic properties of aspirin and allows it to form salts with bases. The ester group is formed from the reaction between the carboxylic acid group of salicylic acid and acetic anhydride. This esterification reaction makes aspirin more soluble in organic solvents and less irritating to the stomach than salicylic acid.
Aspirin is a widely used medication that has anti-inflammatory, analgesic, and antipyretic properties. It works by inhibiting the production of prostaglandins, which are responsible for pain, inflammation, and fever. Aspirin is commonly used to treat headaches, fever, arthritis, and other inflammatory conditions. It is also used as a blood thinner to prevent heart attacks and strokes.
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Write a balanced chemical equation for the reaction between aqueous hydrogen ion, H+, and aqueous hydroxide ion, OH+
H+ (aq) + OH- (aq) → H2O (l)
Erik wants to test clay,slit,and sandy soils for how well they hold water. explain how Erik should complete his investigation.
Erik should mix equal amounts of each soil type with an equal amount of water in separate jars and let them sit undisturbed for several hours to compare the amount of water absorbed by each soil.
How to Investigate the Water Holding Capacity of Soils?To test clay, silt, and sandy soils for how well they hold water, Erik should conduct a simple investigation using the same amount of each soil type and equal amounts of water.
He can begin by taking three different jars and filling each one with the same amount of soil from each type. Then, he should add an equal amount of water to each jar and mix the contents thoroughly.
After mixing, he should allow the jars to sit undisturbed for several hours to allow the water to be absorbed by the soil. He can then measure the amount of water left in each jar and compare the results. This will help Erik determine which soil type holds water better than the others.
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How many moles of MgS are in 100.g MgS?
Answer:
Explanation:
100/56 = 1.79 moles MgS
56 came from the periodic table for Mg and S
If only 1600 grams of CO2 are produced, what is the percent error of this reaction?
Answer:
Explanation:
MTBE (C5H12O)
How old is H2O or water?
4.5 billion years old
hope this helps
Answer:
Earth's water is 4.5 billion years old.
Explanation:
Water is a transparent, odorless, tasteless liquid, a compound of hydrogen and oxygen, H2O, freezing at 32°F or 0°C and boiling at 212°F or 100°C, that in a more or less impure constitutes rain, oceans, lakes, rivers, etc.: it contains 11.188 percent hydrogen and 88.812 percent oxygen, by weight.
Which of the following is a constant?
A. wavelength (λ)
B. Planck (h)
C. energy (E)
D. frequency (f)
B) Planck's constant (h)
Problem 1. What masses of 15% and 20% solutions are needed to prepare 200 g of 17% solution?
Problem 2. What masses of 18% and 5% solutions are needed to prepare 300 g of 7% solution?
Problem 3. 200 g of 15% and 350 g of 20% solutions were mixed. Calculate mass percentage of final solution.
Problem 4. 300 g of 15% solution and 35 g of solute were mixed. Calculate mass percentage of final solution.
Problem 5. 400 g of 25% solution and 150 g of water were mixed. Calculate mass percentage of final solution.
For each problem:
Masses of solution needed are 80 g and 120 g respectively.Masses of solution needed are 120 g and 180 g respectively.Mass percentage of final solution is 22.7%.Mass percentage of final solution is 23.9%Mass percentage of final solution is 18.2%.How to calculate mass and mass percentage?Problem 1:
Let x be the mass of the 15% solution needed and y be the mass of the 20% solution needed.
We have two equations:
x + y = 200 (total mass of the solution)
0.15x + 0.20y = 0.17(200) (total amount of solute in the solution)
Solving these equations:
x = 80 g (mass of 15% solution needed)
y = 120 g (mass of 20% solution needed)
Therefore, 80 g of 15% solution and 120 g of 20% solution need to be mixed to prepare 200 g of 17% solution.
Problem 2:
Let x be the mass of the 18% solution needed and y be the mass of the 5% solution needed.
We have two equations:
x + y = 300 (total mass of the solution)
0.18x + 0.05y = 0.07(300) (total amount of solute in the solution)
Solving these equations:
x = 120 g (mass of 18% solution needed)
y = 180 g (mass of 5% solution needed)
Therefore, 120 g of 18% solution and 180 g of 5% solution need to be mixed to prepare 300 g of 7% solution.
Problem 3:
Let x be the mass of the final solution.
The total amount of solute in the final solution is:
0.15(200 g) + 0.20(350 g) = 55 g + 70 g = 125 g
The total mass of the final solution is:
200 g + 350 g = 550 g
Therefore, the mass percentage of the final solution is:
(125 g / 550 g) x 100% = 22.7%
Problem 4:
Let x be the mass of the final solution.
The total amount of solute in the final solution is:
0.15(300 g) + 35 g = 80 g
The total mass of the final solution is:
300 g + 35 g = 335 g
Therefore, the mass percentage of the final solution is:
(80 g / 335 g) x 100% = 23.9%
Problem 5:
Let x be the mass of the final solution.
The total amount of solute in the final solution is:
0.25(400 g) = 100 g
The total mass of the final solution is:
400 g + 150 g = 550 g
Therefore, the mass percentage of the final solution is:
(100 g / 550 g) x 100% = 18.2%
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