Answer:
The can at 30 degrees had more energy.
Explanation:
Since Heat is a type of energy, and the first can (30C) is hotter than the second can (20C) you can see that it has more energy. Energy is related directly to heat.
The aluminum can at 30 degrees had more energy.
What is energy?Energy is defined as using physical or chemical resources to generate power, particularly to provide heat and light or operate machinery. People have figured out how to transform energy from one form to another and then use it to accomplish tasks, making modern civilization possible. Although energy can take on several forms, it cannot be created or destroyed.
Given that heat is a sort of energy and that the first can is hotter (30C) than the second can (20C), you can infer that the first can has more energy. You need to apply 0.90 J of heat in order to raise the temperature of 1 g of aluminum by 1 C. Under the same circumstances, the temperature of the aluminum varied less than that of the copper.
Thus, the aluminum can at 30 degrees had more energy.
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Antibiotics are powerful medicines for treating some infections, but they have limitations. while antibiotics are very effective in the treatment of bacterial infections, they do not work against viral infections. what differences between bacteria and viruses account for this?
Differences between bacteria and viruses is that viruses do not have cell wall.
Only bacterial infections can be treated with antibiotics, viruses do not respond to antibiotics.
Antibiotics attack the cell wall or coating surrounding bacteria. There are two types of cell wall: Gram-positive and Gram-negative.
For example antibiotic penicillin:
After it was discovered, penicillin was very effective in destroying the bacterium Staphylococcus aureus. Today, because of natural selection in Staphylococcus aureus populations, they are resistant to antibiotics based on penicillin (Staphylococcus aureus bacterium is resistant to methicillin, β-lactam antibiotic of the penicillin class).
Staphylococcus aureus is a Gram-positive, round-shaped bacterium which causes a skin infections.
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technique that separates mixture by solubility
The technique that is used to separate chemical mixtures by solubility is evaporation.
What is solubility?Solubility is defined as the process by which a substance called solute is able to dissolve in a solvent to form a solution.
Evaporation is an example of separation technique that helps in the separation of two substances based on their solubility.
Other examples of separation technique include the following:
Filtration,Distillation, andChromatography.When two substances form a solution, both can be separated into its different constituents through heating the solution in the process of evaporation.
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Write the henderson-hasselbalch equation for a propanoic acid solution (ch3ch2co2h, pka=4.874).
Henderson's Hasselbalch equation for the propanoic acid
[tex]solution \: is \: pH=4.874 + log \frac{[A ^{ - } ] }{HA}[/tex]
This is called known as the Henderson- Hasselbalch equation which relates the pH of an acid aqueous solution with the acid dissociation constant.
[tex]pH=pK _{a } + log \frac{Conjugate \: base}{acid}[/tex]
The Henderson-Hasselbalch equation is derived from the definition of the acid dissociation constant as follows.
Consider the hypothetical compound HA in water.
[tex]HA +H _{2}O→ H _{3} O ^{ + } + A^{ - } [/tex]
The acid dissociation constant of HA,
[tex] [H _3O ^{ + }] = K _a \times \frac{HA}{[A ^{ - } ] }[/tex]
[tex]log [H _3O ^{ + }] = logK_a+log\frac{HA}{[A ^{ - } ] }[/tex]
Multiply both sides of the equation by -1.
[tex]-log[H_3O ^{ + }]=-logK_a-log\frac{HA}{[A ^{-} ] }[/tex]
[tex]pH=pK _{a }+log \frac{[A ^{ - } ] }{HA}[/tex]
[tex][HA] = [A-][/tex]
[tex]pH =pKa +log1[/tex]
[tex]pH = pKa + 0[/tex]
pH=pKa
pKa value of compounds can be determined experimentally using its relation with pH.
According to the Henderson-Hasselbalch equation, when the concentrations of the acid and the conjugate base are the same, i.e when the acid is 50% dissociated, the pH of the solution is equal to the pKa of the acid.
[tex]pK _{a } \: value \: for \: propanoic \:acid \: = 4.874[/tex]
[tex]Let \: propanoic \: acid \: be \: HA.[/tex]
[tex]Let \: propionate \: be \:A ^{ - } .[/tex]
So Henderson-hasselbalch equation for the propanoic acid solution is,
[tex]pH=pK _{a } + log \frac{[A ^{ - } ] }{HA}[/tex]
[tex]pH=4.874 + log \frac{[A ^{ - } ] }{HA}[/tex]
Therefore, Henderson's Hasselbalch equation for the propanoic acid solution is
[tex]pH=4.874 + log \frac{[A ^{ - } ] }{HA}.[/tex]
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When we halve the quantities of reactants and products in a reaction, what happens to the value of the equilibrium constant?.
When we half the quantities of reactants and products in a reaction, the value of the equilibrium constant remains the same.
Formula:
The ratio between the quotient of product concentration to reactant concentration is given below.K = [P]/[R]
Here, [P] is the concentration of the product.
[R] is the concentration of reactant.
If we double the quantities of reactants and products in the final concentration it'll become[R]2= 1/2×[R]1 and [P]2 = 1/2×[P]1
Now at the initial stageK1 = [P1] / [R1]
In the final stage after making the quantities halfK2 = [P2] / [R2]
Putting the given values in the formulaK2/K1 = [P2] / [R2] ÷ [P1] / [R1]
K2/K1 = [P2] / [R2] x [R1] / [P1]
K2/K1= 1/2×[P]1 ÷ 1/2 [R1] x [R1] / [P1]
K2=K1 = 1/2 ÷ 1/2
K2/K1 = 1/2 x 2/1
K2 / K1 = 1
K2 = K1
Thus, the value of the equilibrium constant remains the same.
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Calculate the number of grams of sulfuric acid present in the mixture after the reaction is complete.
3.45g sulfuric acid will be present in the mixture after the reaction is complete.
H₂SO₄ (aq) + Pb(CH₃COO)₂ (aq) ⇌ PbSO₄ (s) + 2 CH₃COOH (aq)
1 mole of sulphuric acid reacts with 1-mole lead(II) acetate to give 1-mole lead(II) sulfate and 2-mole acetic acid.
Mass of lead acetate reacting = 5.00g
Mass of sulphuric acid reacting = 5.00 g
Now, calculating the no. of moles of each reactant involved:
No. of moles = [tex]\frac{Given mass of substance}{Molar mass of substance}[/tex]
Moles of sulphuric acid = [tex]\frac{5.00g}{98.08g}[/tex]
= 0.510 mol
Moles of lead acetate = [tex]\frac{5.00g}{325.29g}[/tex]
= 0.0158 mol
Thus, 0.0158 moles of lead acetate will react with 0.0510 moles of sulphuric acid to give 0.0158 moles of lead sulfate and 0.0158 × 2 = 0.0316 moles of acetic acid.
Therefore, only 0.0158 moles of sulphuric acid will react.
So, the remaining moles = 0.510 - 0.0158
= 0.0352 mol
Remaining mass of sulphuric acid = 0.0352 × 98.08
= 3.45g
Hence, 3.45g sulfuric acid will be present in the mixture after the reaction is complete.
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Solutions of sulfuric acid and lead (II) acetate react to form solid lead (II) sulfate and a solution of acetic acid, 5.00 g of sulfuric acid, and 5.00 g of lead(II) acetate are mixed. Calculate the number of grams of sulfuric acid present in the mixture after the reaction is complete.
One serving of peanuts has about 166.000 calories. Convert this to Joules.
[answer: 695,000 J]
please show me the work! thank youu!
One serving of peanuts has about 166.000 calorie then in joules are 695,000 Joule means 694.544 Joule and 'joule is the amount of energy exerted when a force of one newton is applied over a displacement of one meter'
A calorie is a unit of energy in nutrition, calories refer to the energy people get from the food and drink they consume, and the energy they use in physical activity and calories are listed in the nutritional information on all food packaging many weight loss programs center around reducing the intake of calories.
Here given data is peanuts = 166.000 calories given in the calories then we have to find in joules = ?
In the thermochemical calories to joule we have one given value i.e
1cal th = 4.184 J means here 1 cal = 4.184 J
So, we have to calculate 166.000 calories
Then, 4.184×166.000
= 694.544 J
Which is approximately 695,000 J
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If you have purchased used machinery and it does not come with maintenance instructions, you should __________.
If you have purchased used machinery and it does not come with maintenance instructions, you should contact the manufacturer or check their website.
New machinery always come with maintenance instructions.
With an used machinery that is not always a case.
Machinery manufacturer is the best place to get help for some issues.
The manufacturer can provide necessary informations about maintenance instructions and other important informations about their products.
Another place to find necessary informations is website of the manufacturer of the used machinery. Website usually have many others usefull informations about the product. Many manufacturer optimize their information pages.
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1.1.F - Lesson Review: What is Science Knowledge?
help xnx
The measurement 0.035550 g rounded off to two significant figures would
be
Answer:
0.036g
Explanation:
I've learned about sig figs
Sodium bicarbonate or beta-alanine used to improve anaerobic performances exert their effect by?
Sodium bicarbonate or beta-alanine used to improve anaerobic performances exert their effect on the slow rate of decrease of creatine phosphate.
Anaerobic means "with the air" and refers to the body's use of oxygen to produce energy. This typically includes exercises that last longer than 2 minutes. Continuous "steady state" exercise is done with aerobic exercise. Anaerobic means "without air" and refers to the body's ability to produce energy without using oxygen.
Examples of aerobic exercise include swimming laps, running, or cycling. Anaerobic exercise involves a rapid burst of energy and is performed with maximum effort in a short period of time. Examples include jumping, sprinting, and lifting heavy objects. "Walking is a great aerobic exercise. It's thought to be weight-bearing and good for bone strength and health," he says. Oftentimes, people feel unwell and want to lose weight and get fit, but think they need a gym membership to exercise.
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Set the temperature of the green box to 300k. click on start. after 10 seconds remove the wall. what is the convincing evidence that entropy increased when the wall was removed?
Convincing evidence that entropy increased when the wall was removed, when the distribution of ball speeds evened out, and there was no longer a significant difference in distributions between the two boxes.
Entropy is just a measure of disorder and affects all aspects of our daily lives. If you add more energy by heating the gas, the amount of various possibilities for arranging the energy over the molecules increases.
For example, when a hot object is placed up-to-date with a chilly object, heat flows from the warmer one to the Entropy, never spontaneously from colder to hotter. If heat were to go away from the colder object and pass to the warmer one, energy could still be conserved.
The Second Law indicates that thermodynamic processes, i.e., processes that involve the transfer or conversion of warmth energy, are irreversible because all of them lead to a rise in entropy. Entropy measures what quantity thermal energy or heat per temperature.
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Rutherford proposed the __________. nuclear theory the law of conservation of mass theory of evolution hydrogen bomb power plant
Rutherford proposed the atomic model nuclear theory the law of conservation of mass theory of evolution hydrogen bomb power plant.
The atomic nucleus is the tiny center of an atom that contains practically all its mass. Ernest Rutherford put forward the nuclear structure of the atom, discovered alpha and beta rays, and also projected the laws of radioactive decay. Complete step by step answer we must know that the nuclear theory of the atom was put forward by Rutherford. the law of conservation of mass states that in a chemical reaction mass is neither created nor destroyed.
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How many significant figures are in each measurement?
a.
b. 143 kg
c. 8.75 x 10 -2 g
d. 0.074 m
e. 1.072 cm
f. 0.05730 m
g. 8765 L
h. 11 soccer players
i. 40.007 m
Answer:
Explanation:
b. 3 sig figs
c. 3 sig figs
d. 2 sig fig
e. 4 sig fig
f. 4 sig fig
g. 4 sig fig
h. 2 sig fig
i. 5sig fig
The atomic number of oxygen is 8. What is the mass number of a oxygen atom with 7 neutrons?.
The atomic number of oxygen is 8. The mass number of an oxygen atom with 7 neutrons is 15.
What is atomic mass?Atomic mass is the average mass of the atom. It is measured in atomic mass units, that is Dalton. The mass number is calculated by the number of neutrons and atomic number.
The atomic number is the number of protons present in the atoms. The atomic number of oxygen is 8
The mass number can be calculated by adding those units
atomic number + number of neutrons
Mass number = 8 + 7 = 15
Thus, the mass number of an oxygen atom with 7 neutrons is 15.
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which of the following correctly describes an Arrhenius acid?
Answer:
D.
Explanation:
An Arrhenius acid is a compound that increases the H+ ion concentration in a water solution.
Scientists conducting research found a new type of plastic. They are doing experiments to learn about its properties. Why would the scientists want to repeat their experiments?
Group of answer choices
C. to test different plastics
D. to try to color the plastic different colors
B. to make sure the data they collect are accurate
A. to check that this plastic is the same as another plastic
To make sure the data they collect are accurate
scientific method is a method of procedure that has characterized natural science since the 17th century, consisting in systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypothesesaction research are studies carried out in the course of an activity or occupation, typically in the field of education, to improve the methods and approach of those involvedresearch problem are the tatement about an area of concern, a condition to be improved upon, a difficulty to be eliminated, or a troubling question that exists in scholarly literature, in theory, or in practice that points to the needed for comprehensive understanding and deliberate investigationTo know more about scientific method visit :
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3. Which of the following is determined by a change in velocity divided by time?
a. Speed
b. Acceleration
c. Velocity
Solid calcium carbide, cac2, reacts with water to form an aqueous solution of calcium hydroxide and acetylene gas, c2h2
Solid calcium carbide, cac2, reacts with water to form an aqueous solution of calcium hydroxide and acetylene gas, c2h2
CaC2(s)+2H2O(l)→Ca(OH)2(aq)+C2H2(g)
A solution is a homogeneous mixture of two or more components with particle sizes less than 1 nm. Common examples of solutions are the sugar in water and salt in water, soda water, etc. All components appear as one phase in the solution.
Examples of solutions include salt water, rubbing alcohol, and sugar dissolved in water. If you mix salt and water and look closely, you will not see any salt particles and you will have a homogeneous mixture.
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A 0.372-g sample of naoh(s) is added enough water to make 250.0 ml of solution. the ph of this solution is:______
A 0.372-g sample of sodium hydroxide(s) is added enough water to make 250.0 ml of solution. the ph of this solution is 12.571
gram of sodium hydroxide X 1 mol of NaoH in volume/total vol of NaoH= 0.093ml/250ml=0.372= 12.571
Other names for sodium hydroxide include lye, soda, and caustic soda. Sodium hydroxide is a white, crystalline, odorless solid at room temperature that draws moisture from the atmosphere. It is a product of synthetic manufacturing. It produces significant amounts of heat when dissolved in water or neutralized with acid, which could be enough to ignite combustible objects. It is very corrosive to use sodium hydroxide. In most cases, sodium hydroxide is utilized as a solid or diluted to a 50% solution. The production of soaps, rayon, paper, explosives, dyestuffs, and petroleum products all employ this chemical.
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Convert 3.6 g/cm³ to lb/in³.
Answer:
0.130058
Explanation:
divide the mass / volume by 27.68
how are the earthquakes distributed on the map
The earthquakes distributed on the map on the fault lines at edge of tectonic plates.
Tectonic plate boundaries, or along fault lines, are where earthquakes are most likely to occur. On a map showing tectonic plates, earthquakes will be distributed along the lines on the map. The earthquake epicenter locations shown on the map are not dispersed around the earth's surface at random. The majority of earthquake epicenters are confined to a small area. Most earthquake epicenters, including those in the western parts of North and South America, are found at the edges of certain continents. The Pacific Plate is likewise surrounded by earthquakes. Along the Himalayan mountain range, which is over India, there are also frequent earthquakes. Additionally, all regions with active volcanoes have an earthquake epicenter, but not all regions with earthquake epicenters have active volcanoes, if you try to compare the locations of earthquake epicenters and active volcanoes.To learn more about earthquakes visit:
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1 proton 0 neutrons and is a neutron
Answer: Nuclear fusion
Explanation:
I think
Solve the simultaneous equation
-4x+3y=1
6x-y=2
Answer:
x = 1/2 y = 1
Step-by-step explanation:
Now form equation for y,
→ 6x - y = 2
→ y = 6x - 2
Then the value of x will be,
→ -4x + 3y = 1
→ -4x + 3(6x - 2) = 1
→ -4x + 18x - 6 = 1
→ 14x = 1 + 6
→ x = 7/14
→ [ x = 1/2 ]
Hence, the value of x is 1/2 (or) 0.5.
Now the value of y will be,
→ y = 6x - 2
→ y = 6(1/2) - 2
→ y = 3 - 2
→ [ y = 1 ]
Hence, the value of y is 1.
To make a water-insoluble substance water-soluble, a chemist could add groups with bonds between.
To make a water insoluble substance water soluble, a chemist can add groups with bonds between atoms with different attraction for electrons.
A water soluble drug or substance is easier to be taken up in your digestive system.
Positive and negative are attracted which makes a cohesive structure. When polar compounds or ions gets added to the water, these compounds breaks down or degrades into smaller components. They also might dissolve to become the part of the solution.
The partial charges of water attracts the various parts of a compound. When attraction occurs, it gets more soluble in the water.
Thus, by adding groups with bonds between atoms with different attraction for electrons, substance can become water soluble.
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Which planet will have a diameter
that is approximately ten times
larger than Mercury on a scale
model?
O Mars
O Neptune
O Jupiter
O Venus
The planet that will have a diameter that is approximately ten times larger than Mercury on a scale model is Neptune (option B).
What is a scale model?A scale model is a three-dimensional copy or representation of something in which all parts have dimensions in the same proportion to that of the original.
In the solar system, there are nine planets. These nine planets in a decreasing order of their size (diameter) are as follows:
Jupiter - 142,800 KmSaturn - 120,660 KmUranus - 51,118 KmNeptune - 49,528 KmEarth - 12,756 KmVenus - 12,104 KmMars - 6,779 KmMercury - 4,849 KmBased on the original diameters of the planets, it can be said that the planet that will have a diameter that is approximately ten times larger than Mercury on a scale model is Neptune.
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Answer:
neptune
Explanation:
What is thermodynamics?
a. the study of electric fields
b. the study of organic matter
c. the study of the nucleus
d. the study of heat flow
answer:
d. the study of heat flow.
explanation:
thermodynamics is the study of the relations between heat, work, temperature, and energy.
It is economical to use scrap iron to get copper.
Give one reason why.
Answer:
Yes is my final answer
Explanation:
1. Scrap iron is used to displace copper because it is a more reactive, cheaper metal, making it a cost-effective way to produce copper. Scrap or old iron is also easier to obtain, as it is one of the world’s most recycled scrap metals. During a displacement reaction, iron reacts with a copper sulphate solution. This causes the iron ion to displace the copper to form iron sulphate, with solid copper being produced as a result.
A jet airplane reaches 746. Km/h on a certain flight. What distance does it cover in 10.0 minutes? Set the math up. But don’t do any of it. Just leave your answer as a math expression. Also, be sure your answer includes all the correct unit symbols.
The distance covered by the jet airplane in 10 minutes is 124.582 Km
What is speed?Speed is the distance travelled per unit. Mathematically, it can be expressed as:
Speed = distance / time
With the above formula, we can obtain the distance. Details below
How to determine the distanceThe following data were obtained from the question:
Speed = 746 Km/hTime = 10 minutes = 10 / 60 = 0.167 hourDistance =?Speed = distance / time
Cross multiply
Distance = speed × time
Distance = 746 × 0.167
Distance = 124.582 Km
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Emeralds are composed of 4 different elements in a fixed proportion. they are composed of 5.030% beryllium, 10.040% aluminum, 31.351% silicon and 53.579% oxygen. the empirical and molecular formula are the same
The empirical formula of emerald is Be3Al2Si6O18.
The empirical formula of a compound tells us about the simplest ratio between the atoms present in the compound.
We are given that emerald consists of 5.030% beryllium, 10.040% aluminum, 31.351% silicon and 53.579% oxygen.
So, we need to first convert the percentages into number of moles of the elements.
Let us assume that there is 100 grams of emerald.
Hence, the mass of each element in it is 5.030 grams beryllium, 10.040 grams aluminum, 31.351 grams silicon and 53.579 grams oxygen.
To calculate the moles, we need to divide their given mass by their molar mass
Moles of beryllium(Be) = 5.030/9 = 0.55
Moles of aluminium(Al) = 10.040/27 = 0.37
Moles of silicon(Si) = 31.351/28 = 1.107
Moles of oxygen(O) = 53.579/16 = 3.34
Now, we need to divide the moles by the lowest common number among them i.e, 0.37.
So, 0.55/0.37 = 1.5
0.37/0.37 = 1
1.107/0.37 = 3
3.34/0.37 = 9
So, the ratio of Be:Al:Si:O comes out to be 1.5:1:3:9.
As the ratio contains 1.5, so we need to multiply it by 2 to get a whole number.
So, (1.5:1:3:9) x 2 = 3:2:6:18
Thus, the empirical formula of emerald is Be3Al2Si6O18.
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The empirical formula of emerald is [tex]Be_{3}Al_{2}Si_{6}O_{18}[/tex].
The empirical formula of a compound tells us about the simplest ratio between the atoms present in the compound.
We are given that emerald consists of 5.030% beryllium, 10.040% aluminum, 31.351% silicon and 53.579% oxygen.
So, we need to first convert the percentages into number of moles of the elements.
Let us assume that there is 100 grams of emerald.
Hence, the mass of each element in it is 5.030 grams beryllium, 10.040 grams aluminum, 31.351 grams silicon and 53.579 grams oxygen.
To calculate the moles, we need to divide their given mass by their molar mass
Moles of beryllium(Be) = [tex]\frac{5.030}{9} = 0.55[/tex]
Moles of aluminium(Al) = [tex]\frac{10.040}{27} = 0.37[/tex]
Moles of silicon(Si) = [tex]\frac{31.351}{28} = 1.107[/tex]
Moles of oxygen(O) = [tex]\frac{53,579}{16} = 3.34[/tex]
Now, we need to divide the moles by the lowest common number among them i.e., 0.37.
So, [tex]\frac{0.55}{0.37} = 1.5[/tex]
[tex]\frac{0.37}{0.37} = 1[/tex]
[tex]\frac{1.107}{0.37} = 3[/tex]
[tex]\frac{3.34}{0.37} = 9[/tex]
So, the ratio of Be:Al:Si:O comes out to be 1.5:1:3:9.
As the ratio contains 1.5, so we need to multiply it by 2 to get a whole number.
So, (1.5:1:3:9) x 2 = 3:2:6:18
Thus, the empirical formula of emerald is [tex]Be_{3}Al_{2}Si_{6}O_{18}[/tex]..
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How many moles of naoh are present in 25.0 ml of a 0.1000 m naoh solution?
a. 100 mol
b. 2.50 x 10-3 mol
c. 0.100 mol
d. 2.50 mol
e. 25.0 mol
2.50 x 10⁻³ mol naoh are present in 25.0 ml of a 0.1000 m naoh solution
Here Molarity formula is used to find moles in solution
Molarity = no of moles of solute/volume of solution
M= molarity, V = volume , n= no of moles
M=0.1000m , V=25.0ml , n=?
M=n/v(ml)×1000
n=MV/10³ = 0.1000×25.0/10³ = 2.50 x 10⁻³ mol
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