Answer:
0.0456 M
Explanation:
The concentration of glucose can be determined as follows:
Step 1: Concentration of glucose in the original solution = Mass of glucose / Volume of solution = 227.9 g / (500.0 mL x 10^-3 L/mL) = 0.456 M
Step 2: Concentration of glucose in the dilute solution = Mass of glucose / Volume of dilute solution = 0.456 M x (16.8 mL x 10^-3 L/mL) / (250.0 mL x 10^-3 L/mL) = 0.0456 M
So, the concentration of glucose in the dilute solution is 0.0456 M to 4 significant figures.
ALLEN
Which group would most benefit from the claim?
O people who sell coffee with caffeine
• people who sell decaffeinated tea
• diners that serve only drinks without caffeine
O manufacturers of caffeine-free bottled fruit juice
The group that would most benefit from the claim is people who sell coffee with caffeine.
What was the claims assertion?Caffeine increases mental alertness, making it ideal for activities related to the workplace because it makes a person more attentive, aware of their surroundings, and better able to keep up with tasks.
Caffeine enhances motor coordination, which is the capacity to coordinate various body parts to produce complicated movements. Among those who are active, the capacity to enhance motor coordination may increase need for caffeine.
The organizations who would gain most from the claim are the dealers in caffeinated items, including; based on the link of caffeine with benefits that are desired by active people (working people who earn income).
Therefore, option A is correct.
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See question in the picture below , will give brainliest for correct answer
hope it helped .r.a.t.e
What is the mechanism of the Perkin reaction, and what role do the various components of the reaction play in its mechanism?
Answer:
The Perkin reaction is an organic chemical reaction that converts an alpha-naphthol and a sodium salt of an aldehyde into a substituted naphthol. The mechanism of the Perkin reaction is a type of electrophilic aromatic substitution reaction.
In the first step, the sodium salt of the aldehyde reacts with sodium hydroxide to form a sodium alkoxide. The sodium alkoxide then acts as a nucleophile and attacks the naphthol ring, leading to the formation of an intermediate that contains a tetrahedral carbon atom.
In the second step, the intermediate undergoes an elimination reaction to form an aromatic compound with a hydroxyl group in place of the aldehyde. This reaction is facilitated by the presence of an electron-withdrawing group in the para position of the ring, which stabilizes the intermediate and promotes the elimination reaction.
In conclusion, the various components of the Perkin reaction play different roles in its mechanism. The sodium salt of the aldehyde acts as a source of nucleophilic attack, while sodium hydroxide is used to generate the nucleophile. The naphthol ring acts as an electrophilic aromatic system, and the electron-withdrawing group in the para position helps to stabilize the intermediate and promote the elimination reaction.
Explanation:
ALLEN
Answer:
reaction alpha baphtil and sodium salt
Explanation:
At 20°C water has a density of 0.998 g/mL and at 70°C its density is 0.978 g/mL. Based on the definition of density, how can you explain this density difference?
The density is described below, the relationship of density and temperature.
What is density ?
How compact or concentrated anything is is determined by its density. Take two boxes as an illustration, one huge and one little. They both weigh the same, though. This indicates that the small box is more dense than the huge box. Additionally, density conveys how crowded or dense something is.
What is temperature?
In the International System of Units (SI), the kelvin serves as the fundamental measure of temperature. K serves as its symbol. For practical purposes, it is frequently convenient to use the Celsius scale, where 0 °C nearly resembles the freezing point of water and 100 °C signifies the boiling point of water at sea level.
Density = mass / volume
There is no change in mass with temperature.
Volume increases with increases in temperature because kinetic energy of molecules increases with temperature. so the molecules are move away from each other.
So, since density is inversely proportional to volume.
As temperature increases, volume increases thus density increases.
Therefore, The density is described above, the relationship of density and temperature.
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In the wave models, you imagined adding energy into the wave by moving your arm up and down or back and forth. These are called mechanical waves. Explain how you know that energy traveled from you to your friend. In your answer, identify the medium that the energy traveled through.
The energy traveled from you to your friend through the medium of the air. When you moved your arm, the energy created a vibration in the air which then propagated in all directions. As the wave traveled, it passed through the air and eventually reached your friend, carrying energy with it.
What is energy?Energy is the ability to do work or cause change. It is the capacity to cause motion, to create heat, to transform matter, or to generate electricity. It can come from a variety of sources, such as the sun, wind, water, fossil fuels, nuclear energy, and other renewable sources. Energy can also be stored in batteries or fuel cells. It is a fundamental component of the universe and is essential for life. All life forms require energy to survive and grow, and energy is also necessary for the development of technology. Without energy, the world would not function as it does today.
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Part A
Calculate the freezing point of a solution containing 11.1 g FeCl3 in 153 g water.
Part B
Calculate the boiling point of the solution above.
Part C
Calculate the freezing point of a solution containing 6.0% KCL by mass (in water)
Part D
Calculate the boiling point of the solution above.
Part E
Calculate the freezing point of a solution containing 0.155 m MgF2
Part F
Calculate the boiling point of the solution above.
Answer:
no answer
Explanation:
I wish I could help you, but go to your text book for reference
When 50 grams of KCI is dissolved in water at 50 °C, the solution
can be correctly described as:
The solution is supersaturated from the solubility curve shown.
What is the solubility curve?A solubility curve is a graphical representation of the relationship between the solubility of a substance and temperature. It shows how the solubility of a solid solute (e.g., salt, sugar) changes with temperature in a given solvent (e.g., water).
A solubility curve is typically plotted with solubility on the y-axis and temperature on the x-axis. The curve generally slopes upward, meaning that as the temperature increases, the solubility of the solute in the solvent also increases. This is because higher temperatures increase the energy of the solvent and solute particles, making it easier for them to dissolve and form a homogeneous solution.
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Missing parts:
When 50 grams of potassium chloride KCI is dissolved in 100 grams of water at 50 C the solution can correctly be described as
A unsaturated
B saturated
C supersaturated
A reaction vessel is charged with 0.50 atm of A and 0.130 atm of B. Once the reaction reaches equilibrium, what is the equilibrium partial pressure of B? Kp for this reaction is 67.2
A (g) ⇌ 2 B (g)
If a reaction vessel is charged with 0.50 atm of A and 0.130 atm of B. Once the reaction reaches equilibrium, the equilibrium partial pressure of B is: 5.79 atm.
What is the equilibrium partial pressure of B?To calculate the equilibrium partial pressure of B, we need to use the expression for an equilibrium constant (Kp). The equation for Kp for a reaction of the form A (g) ⇌ 2 B (g) is given by:
Kp = (P_B^2) / (P_A)
Where:
P_A and P_B are the equilibrium partial pressures of A and B, respectively.
Given that the initial pressures of A and B are 0.50 atm and 0.130 atm, respectively, and the value of Kp is 67.2, we can use the above equation to calculate the equilibrium partial pressure of B:
Kp = (P_B^2) / (P_A) = 67.2
P_A = 0.50 atm
Therefore,
(P_B^2) / (0.50 atm) = 67.2
P_B^2 = 67.2 * 0.50 atm = 33.6 atm
P_B = √(33.6 atm) = 5.79 atm
So, the equilibrium partial pressure of B is approximately 5.79 atm.
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1. How many atoms of nitrogen are there in 0. 50 mol of (NH4)2CO3?
A. 1
B. 2
C. 3. 01 × 1023
D. 6. 02 × 1023
There are[tex]6.02*10^{23}[/tex] atoms of nitrogen in 0.50 mol of (NH4)2CO3. The correct answer is D. [tex]6.02*10^{23}[/tex]
How to determine the number of atoms present in nitrogen?To determine the number of atoms of nitrogen in 0.50 mol of (NH4)2CO3, we first need to find the total number of moles of nitrogen in the compound.
(NH4)2CO3 contains two nitrogen atoms in each molecule, so the total number of moles of nitrogen is:
2 nitrogen atoms/molecule x 0.50 mol = 1.00 mol of nitrogen
We know that one mole of nitrogen contains Avogadro's number[tex](6.02 * 10^{23})[/tex] atoms of nitrogen. Therefore, 1.00 mol of nitrogen also contains [tex](6.02 * 10^{23})[/tex]atoms of nitrogen.
Therefore, there are [tex](6.02 * 10^{23})[/tex]atoms of nitrogen in 0.50 mol of [tex](NH4)2CO3.[/tex]
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if the researcher wishes to conduct her test at the 0.05 level, what is the critical value of z that she must beat to reject the null hypothesis
If the researcher obtains a z-score that is greater than 1.645, she can reject the null hypothesis at the 0.05 level of significance and conclude that the alternative hypothesis is supported.
To determine the critical value of z for a one-tailed hypothesis test at the 0.05 significance level (or alpha level), we need to use a z-table or statistical software.
For a one-tailed test with a 0.05 significance level, look for the z-score that corresponds to the 95th percentile of the standard normal distribution. Find the z-score that separates the bottom 95% of the distribution from the top 5%.
Using a z-table, find that z-score for 95th percentile is approximately 1.645.
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the town in the video stressed using locally made goods instead of imported goods. how could using locally made goods lover CO2 emissions
The way that using locally made goods can lower CO2 emissions is by reducing the emissions from the transport needed to take foreign made goods to a place.
How do locally made good usage lower CO2 emissions ?The use of locally made goods can lower CO2 emissions by reducing the transportation distance needed to transport goods. When goods are manufactured and consumed locally, they do not need to be transported over long distances, which can greatly reduce the carbon emissions associated with transportation.
Transportation is a significant source of greenhouse gas emissions, particularly emissions from the burning of fossil fuels like gasoline and diesel. By reducing the amount of transportation needed, the use of locally made goods can help to lower the overall carbon footprint of an economy.
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Sophie is pushing her bike up a hill with 10N if she increases her force to 12n
Sophie is pushing her bike up a hill with 10N if she increases her force to 12N, then there will be decrease the bike's mass. Therefore, the correct option is option C.
What is force?A force is indeed an effect in physics that may modify the velocity of an item. A force can cause a mass object to change its velocity (e.g., moving from rest), i.e., to accelerate.
Intuitively, force may be characterized as a push or even a pull. A force is a vector quantity since it has both direction and magnitude. It really is measured in newtons, the SI unit of mass (N). Sophie is pushing her bike up a hill with 10N if she increases her force to 12N, then there will be decrease the bike's mass.
Therefore, the correct option is option C.
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How many milligrams of sodium sulfide are needed to completely react with 4.80 mL of a 0.0900 M aqueous solution of cadmium nitrate, to form a precipitate of CdS(s)
According to molar concentration, 0.055 ×10[tex]^-3[/tex] mg of sodium sulfide are needed to completely react with 4.80 mL of a 0.0900 M aqueous solution of cadmium nitrate, to form a precipitate of CdS.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
mass of sodium sulfide is calculated as, 0.09×236.42×0.0048=0.102 g.Now, according to stoichiometry where 78.04 g Na₂S gives 144.46 g CdS ,for 0.102 g sodium sulfide 78.04×0.102/144.46=0.055 g or 0.055×10[tex]^-3[/tex] mg.
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Answer:
See Below
Explanation:
If my math is correct then this should be balanced
3Fe + 4H2O -> Fe3O4 + 4H2
Answer: 3Fe + 4H2O ---> 1Fe3O4 + 4H2
Fe : 3 : 3
H : 8 : 8
O: 4 : 4
The specific heat of water, 4.180 J·(g·K)−1, is greater than that of many other substances, such as aluminum, copper, and iron, which have specific heats of 0.902 J·(g·K)−1, 0.395 J·(g·K)−1, and 0.449 J·(g·K)−1, respectively. Which of the following statements about water can be attributed to this observation?
substances, such as aluminum, copper is measured in J/mole C rather than J/gC. 18.0 g/mole times 4.18 J/gC results in 75.2 J/moleC.
Is iron's specific heat higher than copper's specific heat?The key is to always keep in mind that the specific heat of copper is lower than that of iron. You need to keep in mind that the heat of metal is higher than the heat capacity of copper. As a result, we can state that Q is identical to Late Mr. Delta T.
Is water's specific heat 4.184?The temperature of the water equals 4.184 J/g-K due to the fact that there will be 4.184 megawatts in a calorie. Another way to define the ease that an item receives or loses heat.
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A team of students develop a model to describe why structural changes to genes affect proteins. The team provides two groups of students with the same materials, but one group must make a bridge while the other group makes a building. Analyze the team's model and explain why it incorrectly models the impact of gene mutations on proteins.
The team provides two groups of students with the same materials, but one group must make a bridge while the other group makes a building. The bridge model is correct.
What is gene ?A gene is the fundamental and structural unit of the hereditary that codes for specific information and proteins required for signaling and cell function.
A mutation or change in the sequence of the region will result in the modification of the proteins coded, resulting in a change in the genotype and phenotype.
If a gene is mutated and the proteins change, the entire sequence and the information for which it codes will change in the building model.
Thus, gene mutation will impact the proteins.
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The viscosity of glycerol is higher than that of water. Which statement best explains this difference in value? A. water has greater dispersion forces, B. THe single O-H bond in water is very polar, but glycerol has three O-H bonds, which form a network of attractive forces. C. glycerol has a higher molecular mass than water, so it has greater dispersion forces. OR D. Glycerol has a higher boiling point than water.
B. The single O-H bond in water is very polar, but glycerol has three O-H bonds, which form a network of attractive forces.
What is glycerol?Glycerol is a colorless, odorless, sweet-tasting, viscous liquid that is widely used in pharmaceutical formulations. It is a sugar alcohol, which is a type of carbohydrate that is not fully metabolized by the body. Glycerol is a by-product of the hydrolysis of fats and oils. It is used in various industries, such as cosmetics, food, medical and pharmaceuticals, and it is also used as an anti-freeze and a solvent. It is used in skin care products and as an emollient, and it helps to retain moisture in the skin.
This network of attractive forces causes the particles to stick together more, making it harder for them to move, and thus increasing the viscosity.
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Belief that the color red is a hopeful color or that it is associated with death are examples of:
Group of answer choices
various saturations.
cultural contexts.
a color model.
various palettes
Belief that the color red is a hopeful color or that it is associated with death are examples of cultural contexts. That is option B.
What is cultural contexts?Cultural contexts can be defined as the belief, ideas and norms that are shared by a group of people which is usually passed from generation to generation.
There are usually four aspects of cultural context are setting, lifestyle, purpose, and falling action.
The belief that colour red is associated with death is related to culture because red is associated with the colour of blood.
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Count the number of atoms in the formula: 2Ca(OH)2
Ca atoms
There are
type your answer...
There are
type your answer...
There are type your answer...
O atoms
Hatoms
The total number of atoms is type your answer...
The total number of atoms in the formula is 2 + 4 + 4 = 10 atoms.
What are atoms?
An atom is the basic unit of matter and the defining structure of elements. The term "atom" comes from the Greek word for indivisible, because it was once thought that atoms were the smallest things in the universe and could not be divided.
Atoms are composed of a nucleus, which contains positively charged protons and uncharged neutrons, surrounded by a cloud of negatively charged electrons. The number of protons in an atom's nucleus determines what element the atom is, as each element has a unique number of protons.
To count the number of atoms in the formula 2Ca(OH)2, we need to determine the number of each type of atom present.
In this formula, there are:
2 calcium atoms (Ca)4 oxygen atoms (O)4 hydrogen atoms (H)So, the total number of atoms in the formula is 2 + 4 + 4 = 10 atoms.
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How many moles of lithium fluoride (LiF) are present in a 39 gram sample?
Answer:
[tex]\huge\boxed{\sf n = 1.5\ mol}[/tex]
Explanation:
Given data:Mass = m = 39 g
Molar mass = M = 7 + 19 = 26 g/mol
Required:No. of moles = n = ?
Formula:[tex]\displaystyle n = \frac{m}{M}[/tex]
Solution:Put the given data in the above formula.
n = 39/26
n = 1.5 mol[tex]\rule[225]{225}{2}[/tex]
Look at the picture below
The relationship between temperature and gas motion is a direct relationship.
Why does temperature and the motion of the gases have a direct relationship?The kinetic energy of gas particles is proportional to the square of their velocity, so as the temperature of a gas increases, the velocity of its particles also increases. This means that the motion of the gases becomes more energetic, causing the particles to collide more frequently and with greater force. These collisions result in an increase in pressure and volume, which are two other characteristics that are related to the temperature and motion of gases.
In summary, the relationship between temperature and the motion of gases can be explained by the kinetic theory of gases, which states that the temperature of a gas is directly proportional to the average kinetic energy of its particles. As the temperature of a gas increases, its particles move faster, resulting in more energetic collisions and changes in pressure and volume.
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If a gas has a volume of 1.1 L when there are 0.05 mol present, what will be the volume if the new volume of the gas if you use 0.600 mol of gas?
________ L
If you use 0.600 mol of gas, the gas will have a new volume of 13.2 L.
What is volume?The amount of space a three-dimensional item takes up is measured by its volume. Usually, it is expressed in terms of liters (L), cubic meters (m3), or cubic feet (ft3).
How do you determine it?The volume of the gas is directly proportional to the amount of gas (measured in moles) present, presuming constant temperature and pressure. Avogadro's Law describes this connection.
This law allows us to establish a proportion:
Amount1 / Volume1 = Volume2 / Amount2
If Volume2 is the new volume we wish to find, Volume1 is the initial volume, Amount1 is the initial amount of gas (in moles), and Volume2 is the new volume (in moles).
By entering the specified values, we obtain:
Volume2 / 0.600 mol = 1.1 L / 0.05 mol
For Volume 2, we solve as follows:
Volume2 = 1.1 liters / 0.05 mol / 0.600 mol = 13.2 liters
Therefore, if you use 0.600 mol of gas, the new volume of the gas will be 13.2 L.
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37. Which of the following is an example of
speed?
a. 100 m/s²
b. 500 m/s
c. 200 m/s West
d. 250 m
Answer:
b. 500 m/s
Explanation:
a. Derive planar density expressions for FCC(100) and (111) in terms of the atomic radius R.b. Compute and compare linear density values for these same two planes for aluminum.Consider the (100) plane inFCC in the figure below.How many atoms are centered on the [100] inFCC?
Derivate planar density expressions for FCC(100) and (111) is 1/4R² and 4R²√3, number of atoms are centered on the [100] in FCC is 4.
Atoms can be arranged either closely or widely together. A periodic three-dimensional pattern of atoms is packed into crystalline solids like metals. Atoms are not subject to periodic packing in non-crystalline materials like silicon oxide. A unit cell is a crystal structure's fundamental building block. The packing density of crystals is measured by planar density.
For (100) plane one atom at each of four cube corners
,each of which is shared with four adjecent unit cells.
Centre atom lies with in the unit cell.
Thus there is the equivalence of 2 atoms associated with this FCC(100) plane.
The plannar section in the above figure is square.
Where
The side lengths are equal to unit cell edge length = 2R√2
Area of the square =( 2R√2 )2
=8R2
a) So plannar density of (100) plane
PD (100)plane =(number of atoms centerd at (100) plane) / (area of plane)
= (2) / 8R2
=1 / 4R2
∴Plannar density of FCC(100) is 1 / 4R2.
b) There are 6 atoms whose centre lie on this plane .
Total equivalence is 2 atoms associated with this FCC(111) plane at centered.
In above diagram
(2R)2 + h2 = 4R2
which leads to h = 2R√3
Thus Area =4(R) (h) /2
=4(R) (2R√3) /2
=4R2√3
PD (111)plane =(number of atoms centerd at (111) plane) / (area of plane)
=(2) / 4R2√3
=1/ (2R2√3)
∴Plannar density of FCC(111) is 1/ (2R2√3).
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Triglycerides are the most common lipid found in food and in the body, they consist of a _____ backbone attached to three FA
Triglycerides, also known as triacylglycerols, are composed of a glycerol backbone attached to three fatty acid chains.
The fatty acids are esterified to the three hydroxyl groups of the glycerol backbone, forming a molecule with three fatty acid chains bound to a glycerol molecule. Triglycerides are the main constituents of natural fats and oils and are the most common form of stored energy in animals.
Triglycerides are the main type of fat (lipid) found in the body and in food. They are composed of three fatty acids attached to a glycerol backbone. Triglycerides are an important source of energy for the body and are stored in adipose tissue (body fat) for later use. They can also be found in the bloodstream, where they can contribute to the formation of plaque in the arteries, increasing the risk of heart disease. Triglycerides are commonly found in foods that are high in fat, such as oils, butter, and meats, as well as in some plant-based foods, such as nuts and seeds.
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Solid iron (III) hydroxide decomposes to produce iron (III) oxide and water vapor. Write a balanced equation. If 0.75 L of water vapor are produced at STP,
Fe(OH)3 --> Fe2O3 + H2O (YOU MUST BALANCE THIS BEFORE STARTING)
a. How many grams of iron (III) hydroxide were used? grams of iron (III) hydroxide (3 sig figs)
b. How many grams of iron (III) oxide were produced? grams of iron (III) oxide (3 sig figs)
The balanced equation for the reaction between iron (III) hydroxide and water vapor to produce iron (III) oxide is Fe(OH)₃ -> Fe₂O₃ + 3H₂O
a. 26.5 grams of Fe(OH)₃ used.
b. 40 grams of Fe2O3 produced
How to calculate grams used and produced?Determine the number of moles of water produced: 0.75 L of water at STP (standard temperature and pressure) is equal to 0.75 moles.
Find the number of moles of Fe(OH)3: The reaction produces 3 moles of water for every 1 mole of Fe(OH)3, so 0.75 moles / 3 = 0.25 moles of Fe(OH)3.
Find the mass of Fe(OH)3: Fe(OH)3 has a molar mass of 106 g/mol, so 0.25 moles * 106 g/mol = 26.5 grams of Fe(OH)3.
So the answer to part a is 26.5 grams of Fe(OH)3 were used.
Determine the number of moles of Fe2O3: 0.25 moles of Fe(OH)3 produced 0.25 moles of Fe2O3.
Find the mass of Fe2O3: Fe2O3 has a molar mass of 160 g/mol, so 0.25 moles * 160 g/mol = 40 grams of Fe2O3.
So the answer to part b is 40 grams of Fe2O3 were produced.
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Zinc metal and aqueous copper (II) chloride react to produce aqueous zinc chloride and
copper metal.
O Combustion
O Synthesis
O Single Replacement
O Decomposition
O Double Replacement
O Acid/Base Neutralization
Answer: Single Replacement
Explanation:
This reaction is single replacement because the Zinc pushes out the Copper from the CuCl2 to form ZnCl. This happens because Zinc is above Copper in the activity series.
S + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2O
In the above equation how many moles of H2SO4 can be made when 54 moles of HNO3 are consumed?
Answer:
27 moles of sulfuric acid are produced.
Explanation:
The equation for the reaction between nitric acid (HNO3) and sulfuric acid (H2SO4) to form nitration sulfate (HNO3) and water (H2O) is:
2 HNO3 + H2SO4 → H2SO4 + 2 H2O
For every 2 moles of nitric acid that react, 1 mole of sulfuric acid is produced. So, when 54 moles of nitric acid are consumed, 54/2 = 27 moles of sulfuric acid are produced.
What are some strategies to improve the powerless language?
Some strategies which are used to improve the powerless language include the reduction of the use of the following below:
hedgesintensifiersformal grammar etc.What is a Powerless language?This is referred to as the type of language which suggests to listeners that you are uncertain, insufficient, and not entirely confident with oneself due ti various reasons.
Examples of the reasons are the use of hedges , intensifiers etc which have negative effects on how the speaker is perceived. It is usually characterized by Hesitation like “Well” or “Um” etc and it should be avoided to improve it thereby making it he correct choice.
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Electric Current: Mastery Test
Select the correct answer.
What is the symbol for voltage?
OA. P
OB. V
OC. T
OD. V
Reset
Next
The derived unit for voltage inside the International System of Units is called volt. V is the symbol for voltage. Therefore, the correct option is option D.
What is voltage?Voltage seems to be the difference throughout electric potential between two locations, often referred to as electrical pressure, electric tension, as well as (electric) potential difference.
It refers to the labor required per unit of charge that move pure test charge between two places inside a static electric field. The derived unit for voltage inside the International System of Units is called volt. V is the symbol for voltage.
Therefore, the correct option is option D.
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