help please!
question 1: The electron configuration of an element is shown below.
1s22s22p63s1
Name the group this element belongs to in the periodic table and explain your answer.
Based on the electron configuration, write one chemical property of this element. (10 points)
Question 2: Define electronegativity.
A neutral atom has high electronegativity. Describe what happens to this atom during ionic bond formation. (10 points)
Answers
The element belongs to group 1A of the periodic table because it has only one electron in its 3s orbital.
Based on the electronic configuration, the element is a reducing agent.
Electronegativity is the ability of an atom of an element to attract electrons to itself.
A neutral atom that has high electronegativity will gain electrons to form an anion during ionic bond formation.
What is electronic configuration of an element?The electronic configuration of an element is the arrangement of the electrons found in the atom of the element in shells or orbitals around the nucleus.
Electronic configuration arranges the electrons in the atom of the element in increasing order of energy level.
Considering the given element with the electronic configuration shown below:
electronic configuration of element = 1s²2s²2p⁶3s¹
The element belongs to group 1A of the periodic table because it has only one electron in its 3s orbital, the valence orbital.
Based on the electronic configuration, the element is a good reducing agent.
Electronegativity is the ability of an atom of an element to attract electrons to itself.
A neutral atom that has high electronegativity will gain electrons to form a negative ion or anion during ionic bond formation.
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Related Questions
Place ~0.8 g Fe(NO3)3·9 H2O into a 10 mL volumetric flask and dissolve to the volumetric line with 0.1 M HNO3(aq). (Make sure you pre-rinse the volumetric flask with the 0.1 M HNO3(aq) solution before making the solution. Also, 9 waters of hydration (·9H2O) are present in this chemical, and must be included in the formula weight calculation.) Record the exact mass of iron nitrate used and show the calculation for the solution concentration in your observations.
Before lab, create a plan for the dilution of the Fe(NO3)3(aq) solution created above with DI water. This plan should be clearly outlined in your ELN. Create enough 0.0020 M Fe(NO3)3
How do I go about solving for the dilution plan?
Answers
Answer:
You can take 1mL of your stock solution in a 100mL volumetric flask and complete to volume.
Explanation:
You need to create a 0.00200M solution of Fe(NO₃)₃. First, you have to obtain the concentration of the first solution you made. That is:
0.8g Fe(NO₃)₃.9H₂O × (1mol / 403.9972g) =
0.0020 moles of Fe(NO₃)₃.9H₂O = Moles of Fe(NO₃)₃
In 10mL = 0.010L:
0.0020 moles of Fe(NO₃)₃ / 0.010L = 0.20M Fe(NO₃)₃
This is the concentration of your stock solution, as you want to obtain a 0.0020M solution, you dilution factor must be:
0.20M / 0.0020M = 100
That means you need to dilute your stock solution 100 times.
You can make this dilution, for example,
taking 1mL of your stock solution in a 100mL volumetric flask completing to volume with the solvent, 0.1M HNO₃(aq). Please help me with this Chemistry problem! I’ve been trying to figure it out for hours and it’s driving me mad. I’ll be very grateful :) I made it worth 100 points!
Answers
Explanation:
Hope this somewhat helped:
a. The equation for the reaction of weak acid, C6H5CO2H, with water is: C6H5CO2H + H2O <=> C6H5CO2^- + H3O^+. We can assume that all the C6H5CO2H has reacted with water to form C6H5CO2^- and H3O^+.
The pH is defined as -log(H30^+ concentration), where H30^+ is the hydronium ion, a measure of the acidic strength of the solution. At the equivalence point, all the C6H5CO2H has reacted with the NaOH to form C6H5CO2^- and Na^+. The stoichiometry of the reaction can be determined by balanced the reaction using the information given.
C6H5CO2H + NaOH <=> C6H5CO2^- + Na^+
This reaction tells us that one mole of C6H5CO2H will react with one mole of NaOH to form one mole of C6H5CO2^- and one mole of Na^+.
Identify each of the following half-reactions as either an oxidation half-reaction or a reduction half-reaction.
H2(g) → 2H+(aq) + 2e- oxidation
Cu2+(aq) → + 2e-Cu(s) reduction
Write a balanced equation for the overall redox reaction. Use smallest possible integer coefficients.
Answers
Answer:
H₂(g) + Cu²⁺(aq) → 2H⁺(aq) + Cu(s)
Explanation:
In a redox reaction, one half-reaction is the oxidation (where the atom loss electrons) whereas the other reaction is the reduction (Where the atom is gaining electrons.
In the reactions:
H₂(g) → 2H⁺(aq) + 2e⁻ oxidation
Here, the reaction is written as the oxidation because the hydrogen H₂ is in oxidation state 0 and H⁺ in +1. That means each atom is loosing one electron.
Cu²⁺(aq) + 2e⁻ → Cu(s) reduction
And here, the Cu²⁺ is in +2 oxidation state and after the reaction is in Cu(s) 0 state. Thus, each atom is gaining 2 electrons.
The sum of both reactions is:
H₂(g) + Cu²⁺(aq) + 2e⁻ → 2H⁺(aq) + 2e⁻ + Cu(s)
Subtracting the electrons in both sides of the reaction:
H₂(g) + Cu²⁺(aq) → 2H⁺(aq) + Cu(s)6.Observe the equation below 2 Fe2O3(s) + CO(g) Fe(s) + CO2(g)
i) Balance the equation
Answers
Answer:
the given equation is
Fe2o3+co-- Fe+co2
Balanced chemical equation is
Fe2o3 + 3co-- 2Fe+3co2
A gas is heated from 246 K to 289 K while its volume is increased from 22.0 L to 30.5 L by moving a large piston within a cylinder. If the original pressure was 0.98 atm, what would be the final pressure?
Answers
To determine the final pressure of the gas, we can use the combined gas law equation:
P1 * V1 / T1 = P2 * V2 / T2
where:
P1 = initial pressure
V1 = initial volume
T1 = initial temperature
P2 = final pressure (what we want to find)
V2 = final volume
T2 = final temperature
Given:
P1 = 0.98 atm
V1 = 22.0 L
T1 = 246 K
V2 = 30.5 L
T2 = 289 K
Plugging in the values into the equation, we have:
0.98 atm * 22.0 L / 246 K = P2 * 30.5 L / 289 K
Now we can solve for P2:
P2 = (0.98 atm * 22.0 L * 289 K) / (246 K * 30.5 L)
P2 = 0.98 * 22.0 * 289 / (246 * 30.5)
P2 ≈ 0.998 atm
Therefore, the final pressure of the gas would be approximately 0.998 atm.
which is an example of a colloid? a mixture that settles out, a mixture that scatters light, a mixture that is separated by filtration, or a salt and water mixture?
Answers
These substances have dispersed particles that are large enough to scatter light, making the beam visible. Therefore, out of the options provided, a mixture that scatters light is an example of a colloid. Option B)
A colloid is a type of mixture in which particles are dispersed throughout a medium, creating a homogeneous appearance. Unlike solutions, where the particles are completely dissolved, and suspensions, where the particles settle out, colloids have particles that are larger than those in solutions but smaller than those in suspensions. One characteristic of colloids is that they can scatter light due to the size of the particles. This scattering of light is known as the Tyndall effect. Examples of colloids include milk, fog, and aerosol sprays. These substances have dispersed particles that are large enough to scatter light, making the beam visible. Therefore, out of the options provided, a mixture that scatters light is an example of a colloid. Therefore option B) is correct
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Note Complete Question
which is an example of a colloid?
a mixture that settles out,
b mixture that scatters light,
c mixture that is separated by filtration,
d salt and water mixture?
Could someone draw me electron dot diagrams? The Hydride Ion, Hydrogen Ion, Aluminum Ion, Nitride Ion, Oxide Ion, and Calcium Ion, and Sodium-Ion dot structures? Thanks!
Answers
Answer:
urorrr
Explanation:
hahhahahahahhaahah oki nam omy mymy mymy
Titration calculation
A student added 25cm3 of 0.150mol/dm3 of sodium hydroxide into a conical flask. They carried out
a titration using an unknown concentration of of citric acid. The results of the titration are shown
below. Calculate the concentration of the citric acid.
C6H807 + 3 NaOH
Volume of
C6H807
added in cm3
-
Titration 1
12.50
C6H507Na3 + 3 H2O
Titration 2
11.10
Titration 3
10.20
Titration 4
10.15
Titration 5
10.15
Answers
The concentration of the citric acid is 0.090 mol/dm3 based on the given titration results.
To calculate the concentration of the citric acid, we need to use the stoichiometry of the balanced chemical equation and the volume of sodium hydroxide used.
The balanced equation for the reaction between citric acid (C6H807) and sodium hydroxide (NaOH) is:
C6H807 + 3NaOH → C6H507Na3 + 3H2O
From the equation, we can see that 1 mole of citric acid reacts with 3 moles of sodium hydroxide.
First, let's calculate the number of moles of sodium hydroxide used in the titration. We know that the volume of the sodium hydroxide solution is 25 cm3 and its concentration is 0.150 mol/dm3.
Moles of NaOH = concentration × volume
= 0.150 mol/dm3 × 0.025 dm3
= 0.00375 mol
Since the stoichiometry of the reaction is 1:3 between citric acid and sodium hydroxide, the number of moles of citric acid is three times the number of moles of sodium hydroxide used in the titration.
Moles of C6H807 = 3 × 0.00375 mol
= 0.01125 mol
Now, we can calculate the concentration of the citric acid.
Concentration of citric acid = moles of C6H807/volume of C6H807
= 0.01125 mol / (12.50 cm3/1000)
= 0.090 mol/dm3
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The qualitative analysis experiment you did is actually an abbreviated version of a much larger analysis scheme in which many different cations are separated and identified. Suppose a mixture contains Ag+, K+, NH4+, Hg22+, Pb2+, Mg2+, Sr2+, Ba2+, Cu2+, Al3+ and Fe3+.
(a) Which of the following ions could you separate, by causing them to precipitate, with the addition of HCl? (Hint: HCl is a source of chloride ions. Select all that apply.)
Ag+ K+ NH4+
Hg22+ Pb2+ Mg2+
Sr2+ Ba2+ Cu2+
Al3+ Fe3+
Answers
By inducing them to precipitate, the following ions could be separated by adding HCl:
Ag+, Hg22+, Pb2+
What is HCl?Hydrochloric acid, sometimes known as HCl, is a potent, extremely acidic mixture of hydrogen chloride (HCl) and water. It is a liquid that is colorless, corrosive, and has a strong odor. It is frequently used in industrial and laboratory settings for tasks like metal cleaning, pickling, and pH control.
Ag+, Hg22+, and Pb2+ ions would precipitate from the mixture with the addition of HCl because they produce insoluble chlorides. Hg22+, Pb2+, and Ag+ all produce a white precipitate of AgCl, a yellow precipitation of Hg2Cl2, and a white precipitate of PbCl2. Due to the fact that they either do not create chlorides or their chlorides are soluble in water, the other ions in the combination would not precipitate with the addition of HCl.
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Hydrogen gas is collected over water at 23°C, 767 torr. At this temperature the vapor pressure of water is 21.0 torr. What is the partial pressure of hydrogen in the collected gas?
Answers
The partial pressure of hydrogen gas in the collected gas is 746 torr.
To determine the partial pressure of hydrogen gas in the collected gas, we need to consider the difference between the total pressure of the collected gas and the vapor pressure of water at the given temperature. The partial pressure of hydrogen gas is the pressure exerted by hydrogen alone.
Given information:
Total pressure of the collected gas (Ptotal) = 767 torr
Vapor pressure of water (Pwater) = 21.0 torr
The partial pressure of hydrogen gas (Phydrogen) can be calculated using Dalton's law of partial pressures, which states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of each individual gas.
Phydrogen = Ptotal - Pwater
Plugging in the given values:
Phydrogen = 767 torr - 21.0 torr
Phydrogen = 746 torr
Therefore, the partial pressure of hydrogen gas in the collected gas is 746 torr.
It's important to note that in this calculation, we assume that the water vapor does not react with or dissolve in the hydrogen gas and that the gases behave ideally. Additionally, it's assumed that the collected gas is dry, meaning all the water vapor has been removed or does not significantly contribute to the total pressure.
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A mixture of glycine, alanine, aspartic acid, glutamic acid, leucine, lysine, histidine, asparagine, and phenylalanine are put into an electrophoresis apparatus, with the buffer pH=6.5. Sort each amino acid according to its charge in the buffer with a pH of 6.5.
a. Glycine
b. Alanine
c. Glutamic acid
d. Alanine aspartic acid
e. Leucine
f. Histidine asparagine
g. Phenylalanine
h. Lysine
Answers
Answer:
Positively charged: Lysine, Histidine
Negatively charged: Asparagine, Phenylalanine, Glutamatic acid, Alanine, Glycine, Leucine, Aspartic acid
Explanation:
The charge of an amino acid in solution is determined by its isoelectric point, pI, which is the characteristic pH in which the net electric charge of the amino acid is zero. In solutions of pH below the isoelectric point, the amino acid has a net positive charge whereas in solutions with pH above isoelectric point, the net charge on the amino acid is negative.
In a buffer solution of pH 6.5, the following charges are present in the amino acids given:
Positively charged: Lysine (pI = 9.74), Histidine (pI = 7.59)
Negatively charged: Asparagine (pI = 5.07), Phenylalanine (pI = 5.48), Glutamatic acid (pI = 3.22), Alanine (pI = 6.01), Glycine (pI = 5.97), Leucine (pI = 5.98), Aspartic acid (pI = 2.77)
5. What type of intermolecular force gives water many of its characteristics?
hydrogen bonding
Oion-dipole forces
O dipole-dipole forces
dispersion forces
Answers
Answer:
Hydrogen bonding
Explanation:
Hydrogen bonding is the strongest intermolecular force in water, giving water many of its characteristics and acting to pull water molecules closer to each other.
I hope this helps!
To test for a ammonia, which of these should be held over the test tube Group of answer choices dry red litmus paper dry blue litmus paper moist red litmus paper moist blue litmus paper
Answers
In order to test for ammonia, a moist red litmus paper should be held over the test tube containing the ammonia. Option 3.
Testing for ammoniaAmmonia is a substance that is alkaline in nature. All alkaline substances are able to turn red litmus paper to blue. This is in opposition to acidic substances that turn blue litmus paper to red.
Thus, the first test that can be used to determine if a substance is ammonia would be to hold a moist red litmus paper over the test tube containing the suspected substance.
Since ammonia is gas at room temperature, the substance suspected to be ammonia will diffuse from the test tube to turn the moist red litmus paper to blue.
Other methods to test for ammonia include passing a test tube containing hydrochloric acid over the test tube containing the substance. A white fume of ammonium chloride will confirm the presence of ammonia.
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What happens when light strikes a solid through which it is unable to pass?
O Light is absorbed as energy into the object.
O Light bounces off the object and is reflected.
O Light is absorbed, then shoots back out from the object.
O Light is magnified and becomes brighter.
Answers
O Light is absorbed as energy into the object.
James Ensor's Christ's Entry into Brussels (1889) was painted as a sarcastic response to
Seurat's "La Grande Jatte"
Rodin's "Burghers of Calais
OGauguin's "Where Do We Come
O Courbet's "Burial of Calais"
Answers
James Ensor's Christ's Entry into Brussels (1889) was painted as a sarcastic response to Rodin's "Burghers of Calais." Therefore, the correct answer is Rodin's "Burghers of Calais."
"Burghers of Calais" is a sculpture by Auguste Rodin that depicts six burghers of Calais, a city in France, who offered their lives to save their fellow citizens during the Hundred Years' War.
The sculpture is a representation of heroism, sacrifice, and patriotism. James Ensor, however, was critical of this type of heroic representation and sought to challenge it through his own art.
In "Christ's Entry into Brussels," Ensor depicts a grotesque and chaotic scene of Christ's triumphant entry into the city. The painting is a satirical commentary on the hypocrisy of organized religion and the political corruption in Brussels at the time. It can be seen as a direct response to the heroism and idealism of Rodin's "Burghers of Calais."
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How many grams of LiNO3 must be added to 25.0 g of water to prepare a 5.00% (m/m) solution of LiNO3?
Answers
Answer:
1.25 g.
Explanation:
5% or 25 g
= 0.05 * 25
= 1.25 g (answer).
Calculate the number of moles in 42.15g of magnesium carbonate.
Answers
Answer:
0.5mol
Explanation:
Please mark as brainliest
What information does the percent composition of an atom in a molecule
give?
A. The relative number of atoms one element contributes to a
molecule
B. The relative amount of mass an atom contributes to a molecule
C. The total mass that element contributes to a molecule
D. The total number of atoms of that element in a molecule
Answers
The information that the percent composition of an atom in a molecule give is the The total mass that element contributes to a molecule. That is option C.
What is percent composition of an atom in a molecule?The percent composition of an atom in a molecule is the total mass/amount of an element present in a molecule/compound to the molecular mass of the compound, multiplied by 100.
The mass of an atom is the amount of matter that is contained in that atom.
When you are calculating the percentage composition of an atom in a molecule this is to find out the mass of the atoms of the element that contributes to the given molecule.
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Which of the following represents a compound made of five molecules co5 c2o5 c50 5co2
Answers
Answer:
The answer is: 5co2
a. Identify the structures shown in the diagram. b. Identify the information that is contained within these structures. c. Describe how the structures from this cell would compare to the structures in the nucleus of another body cell from the same person. d. Explain why the structures are in pairs.
Answers
The answer responses to the structures shown in the diagram are:
A. chromosomes
C. They would be the same.
B. They are in pairs because each one comes from a different parent.
What is the structure about?The chromosomes are in pairs because humans have a diploid number of chromosomes, meaning they have two sets of chromosomes, one inherited from each parent.
The nucleus is important in eukaryotic cells and has many important parts that help the cell work properly. There are some parts inside cells called the nuclear membrane, nucleoplasm, nucleolus, and chromatin. Chromatin is made up of DNA and other proteins.
Every part of a person's body has the same genes, but the way they are organized can be different in different types of cells. The chromosomes in our skin cells might not be the same as the chromosomes in our muscle cells, even if they come from the same person.
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Identify the structures shown.
A. chromosomes
B. mitochondria
C. nuclei
D. vacuoles
C
Describe how the structures from this cell would compare to the structures in the nucleus of another body cell from the same person.
A. There would be longer.
B. They would be shorter.
C. They would be the same.
D. They would be different.
Describe how the structures from this cell would compare to the structures in the nucleus of another body cell from the same person.
A. There would be longer.
B. They would be shorter.
C. They would be the same.
D. They would be different.
Explain why the structures are in pairs.
A. They aren't in pairs.
B. They are in pairs because each one comes from a different parent.
C. This cell is making a copy of itself.
D. The cell always has 2 copies in case 1 is damaged.
Duncan takes a break from studying and goes to the gym to swim laps if swimming burns, 615,000 cal per hour, how many kilojoules does swimming burn in the same amount of time?
Answers
One way to limit deforestation is by
A. Practicing crop rotation
b. Increaseing soil fertilization
C. Increase of wood products
D. Using trees grown on tree farms
Thank you!
Answers
Answer:
the answer should be d I'm pretty sure.
What is the calibration of this graduated cylinder? calibration
A. 5 mL
B. 2 mL
C. 1 mL
D. 10 mL
Answers
The answer is 1ml. The answer is 1ml because of calibration of this graduated cylinder
Answer:
1 mL
Explanation:
According to your definition, it is the difference between marked spaces divided by the # of spaces between marked values.
Difference between 2 marked values: 5 mL
# Of Spaces between marked values: 5
Calibration: 5 mL / 5 mL = 1 mL
Rounding off 0.072251 to four significant figures
Answers
0.072251
Explanation:
The Sig Figs would be 5 (0.072251)
In Decimals 6 (0.072251)
Scientific Notation 7.2251 × 10-2
E-Notation 7.2251e-2
The density of a 0.0122 M KMnO 4 is 1.037 g/mL. Suppose 26.35 g of 0.0122 M KMnO 4 are required to titrate 1.072 g of a household H2O2 solution. Do not include units, just enter numerical values. Calculate moles of MnO4– added to reach the endpoint.
Answers
To reach the endpoint, 0.667 moles of \(MnO4^{-}\) were added.
To calculate the moles of \(MnO4^{-}\) added to reach the endpoint, we need to use the molar mass of KMnO4 and the mass of KMnO4 used in the titration.
First, calculate the molar mass of KMnO4:
Molar mass of KMnO4 = (1 mol K x 39.1 g/mol K) + (1 mol Mn x 54.9 g/mol Mn) + (4 mol O x 16.0 g/mol O) = 158.0 g/mol
Next, calculate the moles of KMnO4 used in the titration:
Moles of KMnO4 = \(\frac{ 26.35 g}{158.0 g/mol} = 0.1669 mol\)
Finally, calculate the moles of MnO4– added to reach the endpoint:
Moles of MnO4– = \(\frac{0.1669 mol * 4 mol MnO4^{-}}{1 mol KMnO4 }\)
\(= 0.667 mol MnO4^{-}\)
Therefore,\(0.667 mol MnO4^{-}\)added to reach the endpoint.
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can someone tell me the answer and how to do the problem?
Answers
Answer:
is tht wht u want
Explanation:
1 grams Sodium is equal to 0.043497607849056 mole.
4. Long answer type questions: a. b. C. d. e. f. g. h. j. i. What are the constituent gases of air? Why is the surrounding air not seen with the eyes? How do you prove that air supports burning? How do you show that air occupies space? How do you prove that air has weight? How is air useful to us? Mention any three points. Write any three properties of air. How can you say that air exerts force? Write any four effects of air pollution. Write any three causes of air pollution and any two control measures of it.
Answers
1. The constituent gases of air are:
Nitrogen Oxygen Argon Carbon Dioxide2. The surrounding air is not seen with the eyes because it is transparent. Air molecules are not visible to the na-ked eye, and they do not scatter or absorb visible light significantly. Therefore, air appears colorless and transparent.
What is air?3. To prove that air supports burning, you can perform an experiment with a burning candle. Place a glass jar or bell jar over a lit candle, ensuring that the jar is airtight. As the candle burns, it consumes oxygen from the air inside the jar. Eventually, the candle flame will go out due to the lack of oxygen, proving that air (specifically oxygen) is necessary for burning.
4. To show that air occupies space, you can perform a simple experiment using a plastic bottle or syringe. Fill the bottle or syringe with water, ensuring there are no air bubbles. Then, cover the opening tightly and try to compress the air inside. You will find that it is not possible to compress the air significantly, indicating that air occupies space.
5. To prove that air has weight, you can use a sensitive balance or scale. Weigh an airtight container or balloon, and then fill it with air. The weight of the container or balloon with the added air will be greater than its initial weight, demonstrating that air has weight.
6. Air is useful to us in various ways. Three points highlighting the importance of air are:
Breathing and RespirationCombustion and Energy ProductionClimate Regulation7. Three properties of air include:
Air is Compressible: Air can be compressed or expanded under different conditions, allowing it to fill various spaces and containers.Air has Mass: Air molecules have mass, which means air itself has weight. It exerts pressure on objects and surfaces.Air Exerts Pressure: Due to the collisions of air molecules with surfaces, air exerts pressure in all directions. This pressure is known as atmospheric pressure.Air exerts force in various ways. For example, air pressure allows objects like airplanes to fly by providing lift. Air resistance or drag opposes the motion of objects moving through the air, creating a force that can affect their speed and trajectory.
8. Four effects of air pollution include:
Respiratory ProblemsEnvironmental Damage:Climate ChangeHuman Health Impacts9. Causes of pollution:
Industrial EmissionsVehicle EmissionsResidential and Agricultural Activities10. Two control measures for air pollution include:
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A solution with a pH of 8 is?
Answers
Answer:base
Explanation:
base
A solution with a pH of 8 is basic in nature.
pH is defined as the negative logarithm of H⁺ ion concentration.
pH is a measure of how acidic or basic a substance is. In our everyday routine, we encounter and drink many liquids with different pH. Water is a neutral substance. Soda and coffee are often acidic.
The pH is an important property, since it affects how substances interact with one another and with our bodies. In our lakes and oceans, pH determines what creatures are able to survive in the water.
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a object in a fluid will sink if the
help plz
Answers
Answer:
D.
Explanation:
Because if an object is more dense than water it will sink.
A piece of copper has a mass of 290 g. How many atoms does the sample contain?
Answers
A piece of copper that has a mass of 290 g has 2.748 *10²⁴ molecules.
What is a mole ?A mole is a unit of measurement which relates the molar mass to the amount of the number of atoms and molecules .
1 mole = 6.022 *10²³ molecules or atoms
Molecular weight of copper = 63.55
290 g of Copper = 290/63.55 = 4.56 moles
1 mole has 6.022 *10²³ molecules or atoms
4.56 mole has 4.56 *6.022*10²³ molecules or atoms
= 2.748 *10²⁴ molecules.
A piece of copper that has a mass of 290 g has 2.748 *10²⁴ molecules.
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