a solution is prepared by dissolving 0.69 mol of mgcl2 in 0.40 kg of water. how many moles of ions are present in solution?
Answers
When 0.69 mol of MgCl2 is dissolved in 0.40 kg of water, the resulting solution contains 1 mol of Mg2+ ions and 1.38 mol of Cl- ions.
The given problem involves a solution prepared by dissolving 0.69 mol of MgCl2 in 0.40 kg of water.
To determine the number of moles of ions present in the solution, we need to consider the dissociation of MgCl2.
MgCl2 dissociates into Mg2+ and 2Cl- ions in water. Since there is one Mg2+ ion and two Cl- ions per formula unit of MgCl2, the total number of moles of ions can be calculated as follows:
1 mol of MgCl2 produces 1 mol of Mg2+ ions and 2 mol of Cl- ions. Therefore, the total number of moles of ions in the solution is:
1 mol of Mg2+ + 2 mol of Cl- = 1 mol of Mg2+ + 2 x (0.69 mol) of Cl- = 1 mol of Mg2+ + 1.38 mol of Cl-
Hence, there are 1 mol of Mg2+ ions and 1.38 mol of Cl- ions present in the solution.
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Related Questions
what is the molarity of kmno4 in a solution of 0.0897 g of kmno4 in 0.450 l of solution?
Answers
The molarity of KMnO4 in the given solution is approximately 0.00126 M. Molarity is a measure of the concentration of a solute in a solution. It represents the number of moles of the solute present per liter of the solution.
To determine the molarity of KMnO4 in the given solution, we need to first calculate the number of moles of KMnO4 using its mass and molar mass, and then divide it by the volume of the solution.
The molar mass of KMnO4 can be calculated as follows:
(1 × atomic mass of potassium) + (1 × atomic mass of manganese) + (4 × atomic mass of oxygen)
= (1 × 39.10 g/mol) + (1 × 54.94 g/mol) + (4 × 16.00 g/mol)
= 39.10 g/mol + 54.94 g/mol + 64.00 g/mol
= 158.04 g/mol
Now, let's calculate the number of moles of KMnO4:
Number of moles = Mass / Molar mass
Number of moles = 0.0897 g / 158.04 g/mol
Number of moles ≈ 0.000567 mol
Next, we need to calculate the molarity using the number of moles and the volume of the solution:
Molarity (M) = Number of moles / Volume (in liters)
Molarity = 0.000567 mol / 0.450 L
Molarity ≈ 0.00126 M
In this case, the molarity tells us the concentration of KMnO4 in moles per liter.
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Write four significance of
Scientific procedure
Answers
Answer: A question is asked and/or. A problem is identified and/or. ...
An inference is based on these observations and a. Hypothesis is made.
An experiment is designed and conducted. Results are collected and recorded.
The results are examined and. Discussed and finally. ...
SOMETIMES. Further questions are asked,
Explanation:
calcium hydroxide has a relatively large ksp value. in what ph range is ca(oh)2 more soluble than 1.0 m?
Answers
Calcium hydroxide (Ca(OH)2) is more soluble than 1.0 M in a pH range above 12.43.
To determine the pH range where Ca(OH)2 is more soluble than 1.0 M, we can use the solubility product constant (Ksp). The Ksp of Ca(OH)2 is 5.02 x 10^-6. Using the equation Ksp = [Ca^2+][OH^-]^2, we can calculate the concentrations of calcium and hydroxide ions.
Assuming a 1:2 ratio, the concentration of [OH^-] will be twice that of [Ca^2+]. The concentration of [OH^-] can be calculated as the square root of (Ksp/2) = 5 x 10^-4 M. To convert this to pH, we use the equation pOH = -log[OH^-], giving a pOH of 3.3. The pH range where Ca(OH)2 is more soluble than 1.0 M can then be calculated as 14 - 3.3 = 10.7, which is approximately 12.43.
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how does pentene become pentane?
How does propene become propane?
Answers
The process of changing position is
Answers
Motion is the act of shifting one's position.
By motion, what do you mean?The physics term for a body's position or orientation changing over time. Translation is the movement along a straight or curved path.. Rotation is a motion that modifies a body's orientation.
According to the information provided,
a body is said to be in motion if its position varies over time. Speed, velocity, distance traveled, displacement, acceleration, and time may all be quantitatively described.
Physics' discipline of kinematics discusses a body's motion without mentioning its cause, while dynamics examines forces as well as how they affect motion.
When it is discovered that an object is not altering its location with respect to a certain frame of reference, it is said to be at rest. Another word for the condition of rest is stationary.
Thus, we could draw the conclusion that motion is the process by which an object's location changes over time.
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Which of the following statements is/are CORRECT? 1. For a chemical system, if the reaction quotient (Q) is greater than K, reactant must be converted to products to reach equilibrium. 2. For a chemical system at equilibrium, the forward and reverse rates of reaction are equal. 3. For a chemical system at equilibrium, the concentrations of reactants divided by the concentrations of products equals one.
Answers
The correct statement(s) out of the given three statements is/are: Statement 2 is CORRECT, For a chemical system at equilibrium, the forward and reverse rates of reaction are equal.
Chemical Equilibrium is a state when the forward and reverse reactions occur at an equal rate, and the concentration of the reactants and products no longer change with time. At this stage, there is a stable balance between forward and backward reactions where the reaction rate in both directions becomes equal. The following are the meanings of the given statements: Statement 1: This statement is incorrect because if Q is greater than K, the system is not at equilibrium, so there will be a net reaction that will occur in the reverse direction, so the reactant will be converted into products, and eventually, it will reach equilibrium when Q = K.Statement 2: This statement is correct because the forward and reverse rates of the reaction become equal when the system is at equilibrium, and no further change occurs in the concentration of reactants and products. Statement 3: This statement is incorrect because the concentrations of reactants divided by the concentrations of products are only equal at the start of the reaction when the products are absent, and the reaction has not proceeded yet.
So, the correct statement(s) out of the given three statements is/are: Statement 2 is CORRECT.
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Statement 2 is CORRECT: For a chemical system at equilibrium, the forward and reverse rates of reaction are equal.
What happens to the forward and reverse rates of reaction at equilibrium?At equilibrium, the rates of the forward and reverse reactions are equal, meaning that the rate at which the reactants are converted into products is the same as the rate at which the products are converted back into reactants.
This dynamic balance between the forward and reverse reactions leads to a constant concentration of reactants and products resulting in a stable state known as equilibrium. It is important to note that while the rates of the forward and reverse reactions are equal, the concentrations of reactants and products may not necessarily be equal.
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What is the chemical reaction of aluminum and ferric oxide to produce iron and aluminum oxide?
Answers
Answer:
Ferric oxide reacts with aluminium to produce aluminium oxide and iron. The balanced chemical equation for the given reaction is : Fe2O3 + 2Al → Al2O3 + 2Fe.
(ii) In this experiment the student uses 1.70 g of the anhydrous copper(II) sulfate.
Calculate the molar enthalpy change (delta H) in kJ/mol.
Include a sign in your answer.
[Mr, of CuSO4 = 159.5]
Answers
(ii) In this experiment the student uses 1.70 g of the anhydrous copper(II) sulfate.
Calculate the molar enthalpy change (delta H) in kJ/mol.
Include a sign in your answer.
[Mr, of CuSO4 =
is sodium oxide an acidic oxide or a basic oxide
Answers
Answer:It a Basic oxide
Plz trust Me
Explanation:
Answer:
Sodium oxide is a simple strongly basic oxide. It is basic because it contains the oxide ion, O2-, which is a very strong base with a high tendency to combine with hydrogen ions. Reaction with water: Sodium oxide reacts exothermically with cold water to produce sodium hydroxide solution.
Explanation:
Jose adds five grams of a chemical to one liter of liquid and observes a reaction. If the reaction is endothermic, what will happen?
A
The liquid's mass increases; therefore, the volume of the liquid will increase
B
The liquids' mass decreases; therefore, the volume of the liquid will decrease.
С
Energy is released during the reaction; therefore, the temperature of the liquid will increase.
Energy is absorbed during the reaction; therefore, the temperature of the liquid will decrease.
D
Answers
Answer:
D. Energy is absorbed during the reaction; therefore, the temperature of the liquid will decrease
Explanation:
In a chemical reaction, the reaction is said to be ENDOTHERMIC if the reaction utilizes or uses energy instead of given it off. In this reaction, Jose adds five grams of a chemical to one liter of liquid and observes the reaction.
According to this question, the reaction is ENDOTHERMIC. This means that energy is absorbed or used up during the reaction; therefore, the temperature of the liquid will decrease i.e. the liquid used in the reaction will become COLDER.
Which of the following are characteristics of a temperate broadleaf forest? (Select all that apply.)
They contain mainly coniferous trees.
They experience all four seasons.
They can be found along the Atlantic coast of the United States.
They are very dry and receive little to no rainfall.
Answers
Answer:
They can be found along the Atlantic coast of the United States.
They experience all four seasons.
Explanation:
The characteristic of temperate broadleaf forests are they can be found along the Atlantic coast of the United States and experience all four seasons.
What is temperate broadleaf forest?As the name suggested that temperate broadleaf forests are those forests in which temperature througout the year is moderate and leaf of the tress are broad in shape.
As in that forest temperature is mild but that forest will experience all four seasons.Quality of soil of this forest is rich in minerals.Tress which are mostly present in this forests are oak, maple, beech, hickory, etc which are having broad leaves.They are generally found in central China and eastern North America, means along the Atlantic coast of the United States.Hence they can be found along the Atlantic coast of the United States and experience all four seasons are the characteristics of this forest.
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The most abundant component of the atmospheres of Uranus and Neptune is:
A: Hydrogen.
B: Helium.
C: Methane.
D: Ammonia.
E: Nitrogen.
Answers
The most abundant component of the atmospheres of Uranus and Neptune is methane, which is represented by the chemical formula CH4.
Uranus and Neptune are known as ice giants and their atmospheres are primarily composed of hydrogen and helium. However, methane is the most abundant component after hydrogen and helium. Methane makes up about 2.3% of Uranus' atmosphere and about 1.5% of Neptune's atmosphere. The presence of methane gives these planets their characteristic blue color as it absorbs red light and reflects blue light. The remaining components of the atmospheres of Uranus and Neptune are made up of trace amounts of ammonia, water vapor, and other gases.
In conclusion, the most abundant component of the atmospheres of Uranus and Neptune is methane, which is responsible for their distinctive blue color. While hydrogen and helium are the primary components of their atmospheres, methane makes up a significant percentage and is essential in understanding the composition and characteristics of these ice giants.
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what is the distance from earth to Neptune in standard notation and scientific notation.
Answers
Answer:
Scientific Notation: 4.45963 x 109 km (29.811 A.U.) Scientific Notation: 4.53687 x 109 km (30.327 A.U.) By Comparison: If you weigh 100 pounds on Earth, you would weigh 110 pounds on Neptune.
What MASS of NaCl are required to make 2.69L of a 0.14M solution?Use the correct abbreviation for the UNITS
Answers
To solve this problem, let's use the definition for molarity:
Replacing the values of the problem:
Now, to find the mass, we multiply by the molecular weight of NaCl. (Which is about 58.44g/mol)
The answer is approximately 22.2g of NaCl
elect the correct answer.
Which atom or ion is the largest?
A.
K
B.
K+
C.
Ca
D.
Ca2+
E.
Li
Answers
Answer:
Ca2+ I'm not sure hahahahhahah
Answer:
Ca
hope it is helpful..
PLEASE HELP!!!! ANSWER 2 QUESTIONS FOR 50 POINTS AND BRAINLIEST!
Answers
2)the amount of water in each cup caused the food coloring to spread either faster or slower
The concentration of PBDEs in herring gull eggs from the Great Lakes was about 1100 ppb in 1990, and about 7000 ppm in 2000. What is the doubling time for PBDEs in this source? If past trends continue, what will be the concentration in 2010
Answers
For a concentration of PBDEs in herring gull eggs, doubling time for PBDEs in this source is 0.778 yrs. The concentration in 2010 is equals to 44.16 ppm.
We have a concentration of PBDEs in herring gull eggs from the Great Lakes was about 1100 ppb in 1990.
Concentration in 2000 = 7000 ppm
= 7000 × 10³ ppb
We have to doubling time for PBDEs in this source and concentration in 2010.
Time = 10 yr
The rate constant is \(k = \frac{ 2.303 }{t} \frac{ log[a]}{log[a - x]}\),
Plugging the values, \(k = \frac{ 2.303 }{10} log( \frac{ 7000× 10³ }{1100})\)
= 0.875/yr
Doubling time = 0.69/k
= 0.778 yrs.
Now, the we determine the concentration in 2010. Let the concentration be equal x.
\(0.778 = \frac{ 2.303 }{10} log(\frac{ x}{7000 })\)
=> \(\frac{ x}{7000 \: ppm} = 10^{3.8}\)
=> x = 44.16
Hence, required value is 44.16 ppm.
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A river with 25ppm phosphate and an upstream flow of 40 m ^3/s receives an agricultural discharge of 2.5 m^ 3 /s carrying 1000ppm phosphate. The chemical in the agricultural stream mix instantaneously with the main river flow. The phosphate has a first-order decay rate of 0.15/ day and the river has a cross sectional area of 20 m ^2
perpendicular to the direction of flow. A municipality located 90 km downstream of the agricultural stream discharge point withdraws water for municipal water supply purpose. a. Draw a schematic diagram of the control volume. b. Find the steady-state phosphate concentration in the water withdrawn 90 km downstream? c. Find the treatment requirement (\% removal) in the agricultural waste discharge to achieve 50mg/L concentration in the withdrawal location 80 km downstream? (Hint: Find the concentration of the waste-stream that will produce 50mg/L downstream concentration. Find \% removal from the difference of the influent wastewater concentration with respect to the initial waste-stream concentration, i.e., 1000mg/L )
Answers
The treatment requirement (% removal) in the agricultural waste discharge to achieve 50mg/L concentration in the withdrawal location 80 km downstream is 99.57%
a. Control Volume
The schematic diagram of the control volume is given below.
b. Steady-state Phosphate concentration in water withdrawn 90 km downstream
The steady-state phosphate concentration in the water withdrawn 90 km downstream is given by:
C2 = (Q1C1 + Q2C2)/(Q1 + Q2)
Where,
C2 = Concentration of phosphate in the water withdrawn 90 km downstream
C1 = Concentration of phosphate in the upstream water (25 ppm)Q1 = Upstream flow (40 m 3/s)Q2 = Agricultural discharge (2.5 m^3/s)C2 = ((40 x 25) + (2.5 x 1000)) / (40 + 2.5)C2 = 59.3 ppm
Therefore, the steady-state phosphate concentration in the water withdrawn 90 km downstream is 59.3 ppm.c. Treatment requirement (% removal) in the agricultural waste discharge to achieve 50mg/L concentration in the withdrawal location 80 km downstream
The concentration of the waste-stream that will produce 50mg/L downstream concentration is given by:
50 = (Q1C1 + Q2C2)/(Q1 + Q2)C2 = ((40 x 25) + (2.5 x C2))/(40 + 2.5)50 = (1000 x 2.5) / (40 + 2.5) + (40 x 25) / (40 + 2.5)C2 = 4.3 ppm
The % removal from the difference of the influent wastewater concentration with respect to the initial waste-stream concentration is given by:
% removal = (C in - C out) / C in x 100Where,Cin = Influent wastewater concentration (1000 ppm)
C out = Concentration of waste-stream required to produce 50 ppm downstream concentration (4.3 ppm)\% removal = (1000 - 4.3) / 1000 x 100\% removal = 99.57%
Therefore, the treatment requirement ( % removal) in the agricultural waste discharge to achieve 50mg/L concentration in the withdrawal location 80 km downstream is 99.57%.
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hydrogen sulfide reacts with oxygen () to produce sulfur dioxide () and water. how many grams of will be produced if 100 g of react with 100 g of ?
Answers
The 187.9 grams of sulfur dioxide will be produced when 100 grams of hydrogen sulfide react with 100 grams of oxygen.
To solve this problem, we need to balance the chemical equation first:
H2S + O2 -> SO2 + H2O
The balanced equation shows that one mole of hydrogen sulfide reacts with one mole of oxygen to produce one mole of sulfur dioxide and one mole of water.
To determine how many grams of sulfur dioxide will be produced, we need to find out which reactant is limiting and which is in excess.
First, we need to calculate the number of moles of each reactant, using their molar masses:
Molar mass of H2S = 34.08 g/mol
Number of moles of H2S = 100 g / 34.08 g/mol = 2.936 mol
Molar mass of O2 = 32.00 g/mol
Number of moles of O2 = 100 g / 32.00 g/mol = 3.125 mol
According to the balanced equation, the reaction requires one mole of O2 for every one mole of H2S. Since we have more moles of O2 than H2S, oxygen is in excess and hydrogen sulfide is limiting.
Therefore, the amount of sulfur dioxide produced will depend on the amount of hydrogen sulfide present. From the balanced equation, we know that 1 mole of H2S produces 1 mole of SO2. So, the number of moles of SO2 produced will be equal to the number of moles of H2S.
Number of moles of SO2 produced = 2.936 mol
Finally, we can calculate the mass of sulfur dioxide produced using its molar mass:
Molar mass of SO2 = 64.06 g/mol
Mass of SO2 produced = 2.936 mol x 64.06 g/mol = 187.9 g
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what are the 3 subatomic particles of the atom? What are their corresponding charges and locations within the atom?
Answers
Answer:
Protons, neutrons, and electrons are the three main subatomic particles found in an atom.
Explanation:
the negatively charged electrons can be found around the nucleus in an electron cloud.
Use the particle theory to describe each of the three states of matter.
(MIDDLE SCHOOL) not highschool lol
Answers
3. Write chemical formula for the following
(a) nitrogen
(b) aluminium
Answers
Answer:
a.N
b.Al
Explanation:
nitogen is N in upper case and aluminium is Al.always the second letter is lower case
permalloy steel is an alloy that is 21.2e by mass. how many grams of fe are present in 1.000 kg of steel?
Answers
In one kilogram of steel, there are 212 grams of iron.
A metal alloy with an extremely high magnetic permeability is called permalloy steel. Because of this, the alloy can be used in a variety of situations where high magnetic permeability is necessary. Permalloy is a material that is easily magnetized and demagnetized and is used in places like recording studios and electricity generating plants. Companies that specialize in creating this metal alloy provide a variety of permalloy mixes, including bespoke alloys that can be created upon request for certain tasks.
Given that 21.2/100 g Fe is present in 1 gram, 1000 kg steel will contain (21.2/100)*1000 kg, or 212 grams.
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How many moles are in 25.5g of helium?
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how many grams of h2so4 must be dissolved in 1.08 l of solution to generate a solution with a concentration of 2.69 m
Answers
The mass of H₂SO₄ that must dissolved in 1.08 liters of solution to make 2.69M solution is 271.52 grams.
The molarity of the substance is defined as the number of moles of solute per unit volume of solution in liters.
In this case,
The volume of the solution is 1.08 L.
The required molarity of the substance is 2.69M.
So,
we can write,
Molarity = Moles/Volume
Moles = Molariyt x volume
Moles =2.69 x 1.03
Moles = 2.77
Moles = Mass required/molar mass.
Molar mass of H₂SO₄ is 98 g/mol.
Putting values,
2.77=Mass required/98
Mass required = 271.52 grams.
So, 271.52 grams of H₂SO₄ is required to make 2.69M solution.
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4NaCl + 2SO2 + _____H2O + _____O2 → _____Na2SO4 + 4HCl
Which numbers balance this equation?
- 1,2,4
- 1,2,2
- 2,1,2
- 2,1,4
Answers
The numbers that balance the following equation: 4NaCl + 2SO2 + H2O + O2 → Na2SO4 + 4HCl is 2, 1, 2.
BALANCING EQUATION:
Balancing a chemical equation means to make sure that the number of atoms of each element on both sides of the equation are equal. According to this question, the following chemical reaction are given: 4NaCl + 2SO2 + H2O + O2 → Na2SO4 + 4HCl Some of the coefficients (numbers) have been placed there while some are missing. The equation that includes the missing coefficients (numbers) to balance the equation is:4NaCl + 2SO2 + 2H2O + O2 → 2Na2SO4 + 4HCl
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Answer:212
Explanation:yeah
n each of the following pairs of compounds, circle the one which liberates most heat upon hydrogenation? why?
Answers
The compound that liberates the most heat upon hydrogenation is the one with the most negative enthalpy of hydrogenation.
The enthalpy of hydrogenation is the heat released when one mole of an unsaturated compound reacts with hydrogen to form a saturated compound. It is a measure of the stability of the unsaturated compound, with more stable compounds releasing less heat upon hydrogenation.
Hydrogenation is the process of adding hydrogen atoms to a molecule, usually involving the reduction of unsaturated bonds (double or triple bonds) to single bonds. The compound that releases the most heat during hydrogenation is the one with the least stable initial structure, as it will undergo a more significant change in energy when hydrogen is added.
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if the mass ratio of k to f in a compound is 2.06, how many grams of f are needed to react with 2.30 of k?
Answers
To determine the number of grams of element "f" needed to react with 2.30 grams of element "k", you can use the mass ratio provided in the problem. First, let's call the mass of "f" that is needed x. The mass ratio tells us that the mass of "f" is 2.06 times the mass of "k", so we can set up the following equation:
2.06 * x = 2.30
To solve for x, we can divide both sides of the equation by 2.06:
x = 2.30 / 2.06
This simplifies to:
x = 1.12 grams
Therefore, 1.12 grams of element "f" are needed to react with 2.30 grams of element "k".
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Is "Honey with water" a homogeneous or heterogeneous mixture? explain why?
Answers
Answer: Homogenous mixture
Mixing honey with water will give you a homogenous mixture. It is uniform and even, as the honey particles are distributed equally throughout the water.
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Biodiversity can be altered by __________.
Select one:
All of these
a fire in the ecosystem
unexpected changes in the climate of an ecosystem
a flood in the ecosystem