KCl = Potassium chloride
NaCl = Sodium chloride
FeCl2 = Iron (II) chloride or ferrous chloride
MgO = Magnesium oxide
CuO = Copper (II) oxide or cupric oxide
LiCl = Lithium chloride
PbO = Lead (II) oxide or plumbous oxide
CuI = Copper (I) iodide or cuprous iodide
NaOCl = Sodium hypochlorite
SF4 = Sulfur tetrafluoride
Hope this helped !
What is the mass of 0.25 moles of calcium sulfate
[CaSO4]?
Answer:
The mass of 0.25 moles of calcium sulfate is 34.035 grams
Explanation:
mass=number of moles × molar mass
= 0.25 × 134.14 g/ml
= 34.035g
Explain the process of electroplating a metal spoon with zinc, state the anode cathode and electrolytes to be used. Balance the anodic and cathodic equations at the end of the electroplating.
The metal would be the cathode and Zinc would be the anode. There must be an anode and a cathode in an electrochemical cell.
How do you electroplate a metal with zinc?Steps to electroplate a metal with zinc:
Prepare the electrolyte solution: Dissolve zinc sulfate in water to make a solution. This will serve as the electrolyte solution.
Prepare the metal to be plated (cathode): Clean the metal to be plated thoroughly to remove any dirt, grease, or other contaminants. This is important to ensure good adhesion of the zinc plating.
Prepare the zinc anode: Clean the zinc anode thoroughly and suspend it in the electrolyte solution.
Set up the electroplating apparatus: Connect the positive terminal of the power supply to the zinc anode and the negative terminal to the metal to be plated (cathode). Place the metal to be plated (cathode) in the electrolyte solution.
Start the electroplating process: Apply a direct current (DC) voltage to the electrodes. This will cause the zinc ions in the electrolyte solution to be attracted to the metal to be plated (cathode) and deposit on its surface.
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Sodium hydroxide, NaOH, is a strong base that is used in industrial synthesis and processes such as making paper.
What is the mass of 2.20 x 1022 formula units of NaOH (Molar mass = 40.0 g/mol)?
Express the mass in grams to three significant figures.
To calculate the mass of 2.20 x 10^22 formula units of NaOH, we first need to find the number of moles of NaOH using Avogadro's number (6.02 x 10^23):
Number of moles of NaOH = (2.20 x 10^22 formula units) / (6.02 x 10^23 formula units/mol)
Number of moles of NaOH = 0.0365 mol
Next, we can use the molar mass of NaOH (40.0 g/mol) to convert the number of moles to mass:
Mass of NaOH = (0.0365 mol) x (40.0 g/mol)
Mass of NaOH = 1.46 g
Therefore, the mass of 2.20 x 10^22 formula units of NaOH is 1.46 grams (rounded to three significant figures).
What is the atomic mass of an oxygen isotope that has 8 protons and 10 neutrons in its nucleus?
Responses
8 amu
10 amu
18 amu
not enough information to calculate
Answer:
C. 18 amu
Explanation:
The atomic mass can be defined as the mass of neutrons and protons in the atom.
Atomic mass of oxygen = 10 + 8 = 18 amu
how many liters of oxygen gas at STP are required to react with 7.98 liters of hydrogen gas at STP in the synthesis of water?
(b) calculate the mass of water produced
Answer: Your welcome!
Explanation:
(a) The amount of oxygen gas required to react with 7.98 liters of hydrogen gas at STP in the synthesis of water is 7.98 liters. This is because the balanced chemical equation for the synthesis of water is 2H2 + O2 → 2H2O. Since the moles of hydrogen gas are equal to the moles of oxygen gas, the volume of oxygen gas required would be equal to the volume of hydrogen gas.
(b) The mass of water produced by the reaction is equal to the mass of hydrogen gas (2 x 1.00794 g/mol) plus the mass of oxygen gas (16.00 g/mol) multiplied by the molar ratio of hydrogen gas to oxygen gas (2:1). This gives us a total mass of 18.01588 g.
(b) If a water sample considered to be hard water contains 64 mg of CaCO3 per 300 ml of water. Calculate the hardness in terms of MgSO4 equivalent in mg/litre of MgS 04-
Answer:
Moderately hard water – 61 to 120 mg/L (PPM) or 3.56 to 7 GPG. Hard water – 121 to 180 mg/L (PPM) or 7.06
Explanation:
CAN SOMEONE HELP WITH THESE QUESTIONS BASED ON THE TYPES OF CHEMICAL REACTIONS EXPERIMENT?✨
1- What type of chemical reaction takes place when magnesium metal is added to a solution of iron(ll) sulfate?
2- Which of the compounds or ions used in this lab is toxic?
3- What is a catalyst?
4- Why is universal indicator in this lab?
The type of chemical reaction takes place when magnesium metal is added to a solution of iron(ll) sulfate is displacement reaction.
Magnesium sulfate in large doses may be toxic.
A catalyst is a substance that speeds up a chemical reaction, or lowers the temperature or pressure needed to start one, without itself being consumed during the reaction.
A universal indicator is a pH indicator made of a solution of several compounds that exhibits several smooth colour changes over a wide range pH values
What is Displacement reaction?A displacement reaction is a type of reaction in which part of one reactant is replaced by another reactant. A displacement reaction is also known as a replacement reaction or a metathesis reaction.
Single displacement reactions are reactions where one reactant replaces part of the other:
AB + C → AC + B
An example is the reaction between iron and magnesium sulfate to produce iron sulfate and copper:
Fe + MgSO₄ → FeSO₄ + Mg
Therefore,
The type of chemical reaction takes place when magnesium metal is added to a solution of iron(ll) sulfate is displacement reaction.
Magnesium sulfate in large doses may be toxic.
A catalyst is a substance that speeds up a chemical reaction, or lowers the temperature or pressure needed to start one, without itself being consumed during the reaction.
A universal indicator is a pH indicator made of a solution of several compounds that exhibits several smooth colour changes over a wide range pH values
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10-14 what are the answers Show your work for all of these questions for brainliest and 100 points I need HELP ASAP PLS ITS HW
Answer and solve the following:
IV. Acetylene is a hydrocarbon molecule composed of two carbon atoms and two hydrogen atoms. It is a flammable gas, and when ignited with a spark, it produces an extremely hot flame.
What is molecule ?Molecule is a unit of matter composed of two or more atoms bonded together. Atoms are the basic building blocks of all matter, and molecules are collections of atoms. Molecules can range in size from diatomic molecules composed of two atoms, to large macromolecules made up of hundreds of atoms. Molecules can vary in shape and complexity, and can consist of a variety of different elements. Molecules can be found in all physical states, including solids, liquids, and gases.
Ethylene is a hydrocarbon molecule composed of two carbon atoms and four hydrogen atoms. It is a gas with a sweet odor and is found naturally in plants, fruits, and vegetables.
I.
a. Cr2O3 (Chromium (III) oxide);
b. NH4H2PO4 (Ammonium dihydrogen phosphate);
c. CaSO4 (Calcium sulfate).
II.
a. Iron(II) Chloride
b. Barium Hydroxide
c. Lithium Cyanide
d. Lead(II) Chloride
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How many grams of MgO will be form when 84 grams of MgCO3 decompose?
When 84 grams of MgCO3 decompose, 40.166 grams of MgO will be formed.
What is Decomposition Reaction?
A chemical process known as a decomposition reaction occurs when a single component splits into two or more simpler compounds. It is the opposite of a synthesis reaction, to put it another way.Decomposition reactions occur when a compound is exposed to energy in the form of heat, light, or electricity, or when it reacts with another substance.
The balanced chemical equation for the decomposition of magnesium carbonate (MgCO3) is:
MgCO3 → MgO + CO2
From the equation, we can see that 1 mole of MgCO3 produces 1 mole of MgO. We need to find the number of moles of MgCO3 in 84 grams of the compound:
n(MgCO3) = m/M = 84 g / 84.3139 g/mol = 0.996 mol
Therefore, we can expect 0.996 moles of MgO to form as well. To find the mass of MgO, we can use its molar mass:
m(MgO) = n(MgO) * M(MgO) = 0.996 mol * 40.3044 g/mol = 40.166 g
So, when 84 grams of MgCO3 decompose, 40.166 grams of MgO will be formed.
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at the same temperature and pressure, 2 moles of oxygen gas will occupy twice the volume of 2 moles of hydrogen gas, is this true or false?
It is true that two moles of oxygen will take up twice as much space as two moles of hydrogen at same temperature and pressure.
In chemistry, what does a temperature mean?The mean kinetic energy of every one of the atoms and molecules in a substance is what chemists refer to as the substance's temperature. Different parts of a material have different amounts of kinetic energy. The kinetic energy of the particles at any instant can be represented as a distribution.
What does temperature look like in chemistry?The normal kinetic energy of the water molecules in the hotter water vessel is greater than those in the cooler glass, for example, if two glasses of water are measured to have different temperatures.
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Write an experiment to show that copper does not react with dilute HCl.
As no visible reaction occurs, then the experiment shows that copper does not react with dilute HCl, confirming that copper is not reactive with HCl under normal conditions.
How to demonstrate that copper does not react dilute HCL?To demonstrate that copper does not react with dilute hydrochloric acid (HCl), you can carry out the following experiment:
Materials:
Copper wire or a copper sheetDilute hydrochloric acid (HCl)Test tubeDropperSafety gogglesGlovesWaterProcedure:
Wear gloves and safety goggles before starting the experiment.Cut a small piece of copper wire or a copper sheet and clean it thoroughly with water.Place the copper piece in a test tube.Using a dropper, add a few drops of dilute HCl to the test tube containing the copper piece.Observe the reaction between copper and HCl. If copper does not react with HCl, there will be no visible changes in the test tube, and no gas will be produced.If copper reacts with HCl, bubbles of hydrogen gas will be produced, and the solution will turn greenish due to the formation of copper chloride.Wait for a few minutes to ensure that no reaction takes place.Discard the contents of the test tube in a designated waste container.Conclusion:
If no visible reaction occurs, then the experiment shows that copper does not react with dilute HCl, confirming that copper is not reactive with HCl under normal conditions.
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Which has a greater ionization level Li or Li2+
Compared to Li, Li2+ has a higher ionization level.
Has Li's ionization energy increased?A smaller atom than Na is Li. As a result, Li has a stronger nucleus attraction for valence electrons than Na. Hence, Li's first ionisation energy is higher than that of a nucleus. Due to the size of the lithium ion, more solvent molecules can easily surround the cationic sphere.
Which Li n o ionization energy is the highest?Going from left to right increases the ionisation energy. Ne therefore has the highest ionisation energy of all the elements. Lithium has a higher second ionization energy than beryllium because its valence electrons do not have enough electrons to protect its outer electrons.
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HAVE to turn in tomorrow HELP
What volume of a 0.88 M solution can be made using 130g of FeCl2
the answer is
volume = 1.16L
Please help thank you
To draw the skeletal structure from a Lewis structure, you need to identify the central atom and its bonded atoms.
How do you draw the skeletal structure from the Lewis structure?To draw the skeletal structure from a Lewis structure, you need to identify the central atom and its bonded atoms. The central atom is usually the least electronegative atom in the molecule, and it is surrounded by the other atoms that are bonded to it.
Here are the steps to draw the skeletal structure from a Lewis structure:
Identify the central atom: In the Lewis structure, the central atom is usually the atom that has the most connections to other atoms.
Count the total number of atoms: Count the total number of atoms in the molecule or ion.
Replace the bonding electrons with dashes: Replace the bonding pairs of electrons between the atoms with dashes (-).
Arrange the atoms: Arrange the atoms in a way that makes sense based on their connectivity in the Lewis structure. The atoms should be positioned in a way that minimizes the number of intersections between the dashes.
Add lone pairs: If there are any lone pairs of electrons on the central atom, add them to the skeletal structure as dots.
Check for consistency: Make sure the skeletal structure you have drawn is consistent with the Lewis structure in terms of the number of electrons, the types of atoms, and the bonding pattern.
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What is the spring constant if 125J of energy is stored when a spring is compressed 0.300m?
2780N/m
833N/m
417N/m
1390N/m
The spring constant if 125J of energy is stored when a spring is compressed 0.300m is option A which is 2780N/m
Spring constant calculation.The potential energy stored in a spring is given by the formula:
PE = (1/2) k x^2
where PE is the potential energy, k is the spring constant, and x is the displacement of the spring from its equilibrium position.
We can use this formula to find the spring constant if we know the potential energy stored and the displacement of the spring:
PE = (1/2) k x^2
Rearranging the formula gives:
k = 2PE / x^2
Substituting the given values into the formula gives:
k = 2(125 J) / (0.300 m)^2
k = 2780 N/m
Therefore, the spring constant is 2780 N/m.
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A piece of metal with a mass of 14.9 g is heated from 72.35°C. When the metal is placed in 75.0 g of water at 20.0°C, the temperature of the water rises by 2.85°C. What is the specific heat capacity of the metal? Assume all heat released by metal is absorbed by the water.
A piece of metal with a mass of 14.9 g is heated from 72.35°C. When the metal is placed in 75.0 g of water at 20.0°C, the temperature of the water rises by 2.85°C. 66.35 joule/Kg °C is the specific heat capacity of the metal.
What is specific heat capacity?In thermodynamics, the specific heat capacity (symbol c) of a substance is the heat capacity of a sample of the substance divided by the mass of the sample, also sometimes referred to as massic heat capacity.
Informally, it is the amount of heat that must be added to one unit of mass of the substance in order to cause an increase of one unit in temperature.
Cp of metal× Mass of metal*(initial temperature-final temperature)=Cp of water× Mass of water×(final temperature - initial temperature)
Cp of metal×14.9×(98–28.5)=Cp of water×75×(28.5–20)
Cp of metal×14.9×(98–28.5)=Cp of water×75×(28.5–20)
Cp of metal =66.35 joule/Kg °C.
Therefore, 66.35 joule/Kg °C is the specific heat capacity of the metal.
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A solution is formed by mixing 400. mL of 1.0 M NH3 and 100. mL of 0.75 M AgNO3. The reaction
Ag+ + 2NH3 Ag(NH3)2+, Kf = 1.6 x 107, goes essentially to completion.
(a) What are the final concentrations of the principal species?
the major species ultimate concentrations of AgCl+2NH 3[Ag(NH 3) 2] + +Cl − K=K 1 K two =1.7×10 7 ×1.85×10 −10 =0.31×10 −2.
AgCl is water soluble, right?Na+, Ag+, Cl-, & NO3- are present in the solution as a result, however AgCl is not water soluble. Cl- and Ag+ are currently dissolved together, and as a result, AgCl will precipitate out of solution after the two have combined to create AgCl.
Why would someone use silver chloride?In order to help with mercury elimination, silver chloride has indeed been employed as an antidote to mercury poisoning. a component of several personal deodorant products that acts as an antibacterial agent. to keep drinking water in tanks clean and safe for a long time.
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if __ layers are not __, they must have been __ somewhow.
Two layers must have been separated in some way if they are not attached.
How many secret layers are there in total?The two networks are single layer perceptron networks, in other words. A line is produced by each perceptron. We may infer from the fact that only two lines are needed to represent the decision border that there will be two hidden neurons in the first hidden layer. We have one hidden layer and two hidden neurons up until this moment.
How are layers concealed?These are "hidden" since the training dataset's nodes' actual values aren't known. Indeed, all we know is the input and output. There is at least one hidden layer in every neural network. It is not a neural network if it is not.
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Which of the following is NOT an accurate way to measure wavelength?
A. crest to trough
B. trough to trough
C. half crest to half crest
D. crest to crest
Answer:
B. trough to trough is NOT an accurate way to measure wavelength.
Explanation:
The correct way to measure wavelength is from crest to crest or from trough to trough, as these are the points of maximum displacement in the wave. Alternatively, one could measure from a point halfway between two crests (or two troughs) to another point halfway between the next two crests (or troughs), which is known as half crest to half crest measurement.
The accurate ways to measure the wavelength of a wave are between two crests (crest to crest), two troughs (trough to trough), or half crest to another half crest. Measuring from a crest to a trough gives half the wavelength. Therefore, option A (crest to trough) is not an accurate way to measure wavelength.
Explanation:In the context of wave physics, the accurate ways to measure the wavelength of a wave are between two successive crests (crest to crest), or two troughs (trough to trough). The measurement from a half crest to another half crest is also valid, as it essentially represents the same distance as from crest to crest or trough to trough. However, measuring from a crest to a trough does NOT give you the wavelength, but instead it gives you half the wavelength because a complete wave cycle is from crest to crest or trough to trough. Therefore, option A (crest to trough) is NOT an accurate way to measure wavelength.
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Create a visual guide explaining fireworks and their colors. Explain energy levels in atoms and how it relates to colors.
The rate constant for a certain chemical reaction is 0.00250 L mol1 s1 at 25.0 °C and 0.0125 L mol1 s1 at 50.0 °C. What is the activation energy for the reaction, expressed in kJ?
In terms of the quantity of a reactant that is reduced or the amount of such a product that is increased per unit time, the reaction's activation energy is 89.2 kJ/mol.
By reaction, what do you mean?resistance in opposition to a power, influence, or movement is a reaction, a reactionary act, or an instance of a reactionary act. Particularly: a propensity for an old, typically antiquated political or social structure or policy; a reaction to a given treatment, circumstance, or stimulus. She received the news in shock.
What is an illustration of a reaction?Changes in color, temperature, gas generation, or precipitant formation are common during chemical reactions. Examples of commonplace processes include digestion, combustion, or cooking.
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A sample of CO2 has a volume of 2.7 L at 239 kPa. What would the new pressure be if the volume was increases to 4.5 L?
143.4kPa would be the new pressure be if the volume was increases to 4.5 L
What is an ideal gas ?
An ideal gas is a hypothetical gas that perfectly complies with the gas laws due to its small size and lack of interactions. A gas that obeys all gas laws at all pressures and temperatures is said to be perfect gas.
When the pressure is expressed in kPa, the ideal gas constant is determined to be 8.314J/Kmol. The pressure, volume, temperature, and number of moles of an ideal gas are all related by a singular equation known as the ideal gas law. The combined gas law connects a gas's volume, pressure, and temperature.
Considering constant n, R and T
P1V1 ⇒ P2V2
239*2.7 ⇒ P2 *4.5
P2 ⇒ 143.4kPa
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how many moles of OH are in 1.20 moles of Mg(OH)2
In one mole of Mg(OH)2, there are 2 moles of OH. Therefore, in 1.20 moles of Mg(OH)2, there are: 2 moles of OH/mol of Mg(OH)2 x 1.20 mol of Mg(OH)2 = 2.4 moles of OH.
What distinguishes a mole from a molarity?Mole measures the quantity of chemicals, whereas molarity measures the concentration of those substances. The amount of chemicals in a combination can be estimated by looking at its molarity. One volume of a solvent is equal to the number of moles of a material. Molarity is not a unit, although a mole is.
Are moles and molarity the same?Molarity (M) is calculated by dividing the volume of the solution (V) in litres by the number of moles of solute (n). Not moles of solute per litre of solvent, but rather moles of solute per litre of solution, is a crucial distinction to make when defining molarity.
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During the decomposition of KClO3, 2.94 grams of oxygen gas are created. How many moles of KClO3 reacted? Report your answer with 3 significant figures.
The balanced chemical equation for KClO3 decomposition is: 2KClO3(s) → 2KCl(s) + 3O2(g). 0.061 moles of KClO3 reacted. Rounded to 3 significant figures, the answer is 0.0610 moles of KClO3.
How many moles of KClO3 reacted?
The balanced chemical equation for KClO3 decomposition is:
2KClO3(s) → 2KCl(s) + 3O2(g)
According to the equation, for every 3 moles of O2 produced, 2 moles of KClO3 react. Therefore, the number of moles of KClO3 can be calculated as:
moles of KClO3 = (2/3) × moles of O2
To find the moles of O2 produced, we need to use the molar mass of O2, which is 32 g/mol. As a result, the number of moles of O2 is:
moles of O2 = mass of(O2) / molar mass(O2)
moles of O2 = 2.94 g / 32 g/mol
moles of O2 = 0.092 mol
Now we can calculate the moles of KClO3:
moles of KClO3 = (2/3) × moles of O2
moles of KClO3 = (2/3) × 0.092 mol
moles of KClO3 = 0.061 mol
Therefore, 0.061 moles of KClO3 reacted. Rounded to 3 significant figures, the answer is 0.0610 moles of KClO3.
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If we Use 50.0 g of the reactant O2 how many grams of KClO3 would be formed
If the reaction continues to completion and all of the O2 is burned, we can get 127.32 g of KClO3 from 50.0 g of O2.
Calculation-The balanced chemical equation for the reaction is:
2 KClO3(s) → 2 KCl(s) + 3 O2(g)
50.0 g O2 × (1 mol O2 / 32.00 g O2) = 1.5625 mol O2
1.5625 mol O2 × (2 mol KClO3 / 3 mol O2) = 1.0417 mol KClO3
1.0417 mol KClO3 × (122.55 g KClO3 / 1 mol KClO3) = 127.32 g KClO3
Five kilos of KClO3 will produce how many molecules of O2?The mass has two significant figures in the question, thus the amount of O2 released would be 4.0 g. (two significant figures). 3*32 g of O2 result from 122.55 g of KClO3. 0.783353733 g of O2 would be produced from 1 g of KClO3. Thus, 5 g of KClO3 would produce 4.0 g of O2 or 5*0.783353733 g of O2.
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Fill in the missing parts of the two tables (Structural Formula Lines)
In a structural formula all types of bonds can be represented. A single bond is indicated by a dash, double dash for double bonds and triple dash for triple bonds.
What is a structural formula?A structural formula consists of symbols for the atoms which are connected by the short lines called chemical bonds. It represents how the atoms are arranged in a molecular formula of the chemical compound.
The structural formula of the compounds are:
1. HCl - H - Cl
2. SeI₂ - I - Se - I
3. CO₂ - O = C = O
The structural formula of NH₃ and CCl₄ is given below.
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Molecules are larger compounds consisting of repeating elemental or molecular units
all covalently bonded together, such as a diamond.
A. True
B. False
HELP ILL MARK YOU AS BRAINLIST.!
Calculate the number of moles of magnesium, chlorine, and oxygen atoms in 4.20 molesmoles of magnesium perchlorate, Mg(CIO4)2Mg. Express the number of moles of MgMg, CICI, and OO atoms numerically, separated by commas.
The chemical formula for magnesium perchlorate is Mg(ClO4)2, which contains 1 magnesium atom (Mg), 2 chlorine atoms (Cl), and 8 oxygen atoms (O).
To calculate the number of moles of each element in 4.20 moles of Mg(ClO4)2, we need to use the mole ratios from the chemical formula.
Moles of Mg:
In one mole of Mg(ClO4)2, there is one mole of Mg atoms. Therefore, in 4.20 moles of Mg(ClO4)2, there are 4.20 moles of Mg atoms.
Moles of Cl:
In one mole of Mg(ClO4)2, there are 2 moles of Cl atoms. Therefore, in 4.20 moles of Mg(ClO4)2, there are 2 x 4.20 = 8.40 moles of Cl atoms.
Moles of O:
In one mole of Mg(ClO4)2, there are 8 moles of O atoms. Therefore, in 4.20 moles of Mg(ClO4)2, there are 8 x 4.20 = 33.6 moles of O atoms.
So the number of moles of Mg, Cl, and O atoms in 4.20 moles of Mg(ClO4)2 are: 4.20, 8.40, and 33.6, respectively.
Answer:
Explanation:
7.50 mol Mg
(ClO4)2
contains:
7.50 mol Mg atoms
15.0 mol Cl atoms
60.0 mol O atoms
1 mol Mg(ClO4)2
contains
1 mol Mg atoms, 2 mol Cl atoms, and 8 mol O atoms.