Answers
Zara is examining some animal cells on a slide using a microscope. She is aware that there are animal cells on the slide, but she is unable to see any cells when using the microscope. Give three reasons why Zara might not be able to notice any cells.
Understanding organelles has been greatly aided by microscopes. Most organelles cannot be seen using a light microscope, and those that can (such as the nucleus, mitochondria, and Golgi) cannot be studied in detail because of their size, which is near to the light microscope's resolution limit.
The other cell organelles are too tiny and do not adhere to the dye to be visible under a lab microscope.
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Related Questions
Why do all elements have their own unique color? Please explain.
Answers
All the element have their own unique color because the every element have their own set of energy levels.
According to the bohr model of atoms : electrons exist at certain energy levels. when we give heat to electron , it gets excited and moves from lower energy level to higher energy level. the electron is less stable in higher energy level. when an electron returns from higher energy level to lower energy level it emits some energy in form of radiation. The wavelength of light depends upon energy level . and every elements have their own unique energy levels. The color for different element is different.
Thus, All the element have their own unique color because the every element have their own set of energy levels.
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Stamples of heterogeneous equilibria. FeO(s) + CO(g) = Fe(s) + CO₂(g) II. H₂(g) L₂(g) = 2HI(g) III. CO₂(g) + C(s) = 2CO(g) IV. N₂(g) 3H₂(g) + 2NH3(g) Identify I.
Answers
An example of heterogeneous equilibrium is:
I. FeO(s) + CO(g) ⇌ Fe(s) + CO₂(g)What is heterogeneous equilibrium?Heterogeneous equilibrium refers to an equilibrium state in a chemical reaction where the reactants and products exist in different physical states or phases. It occurs when substances in different phases, such as solids, liquids, and gases, are involved in a chemical reaction.
Considering the given equations:
The equation I: FeO(s) + CO(g) ⇌ Fe(s) + CO₂(g) represents a heterogeneous equilibrium.
This is because the reactants and products involve different phases (solid and gas). FeO is a solid (s), CO is a gas (g), Fe is a solid (s), and CO₂ is a gas (g). The reaction involves the conversion of a solid and a gas to another solid and a gas, and the equilibrium is established between these different phases.
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The equation below shows the products formed when a solution of silver nitrate (AgNO3) reacts with a solution of sodium chloride (NaCl).
Answers
The equation for the reaction between silver nitrate (AgNO3) and sodium chloride (NaCl) is: AgNO3 + NaCl → AgCl + NaNO3.
In this reaction, silver nitrate (AgNO3) reacts with sodium chloride (NaCl) to produce silver chloride (AgCl) and sodium nitrate (NaNO3).
When the two solutions are mixed, the silver ions (Ag+) from silver nitrate combine with chloride ions (Cl-) from sodium chloride to form silver chloride, which is a white, insoluble precipitate. The sodium ions (Na+) from sodium chloride combine with nitrate ions (NO3-) from silver nitrate to form sodium nitrate, which remains in solution.
The reaction is a double displacement reaction, also known as a precipitation reaction, as a solid precipitate (silver chloride) is formed. This reaction occurs due to the exchange of ions between the two reactants.
Silver chloride is sparingly soluble in water and precipitates out of the solution as a solid due to its low solubility. Sodium nitrate, being a soluble ionic compound, remains dissolved in the solution as individual ions.
This reaction is commonly used in the laboratory to test for the presence of chloride ions. The formation of the white precipitate of silver chloride confirms the presence of chloride ions in the solution.
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Which group of elements is considered the most reactive non-metals?
A. Alkalis
B. Alkaline Earth
C. Halogens
D. Noble Gases
Please I need help
Thank you so much if you can help me
Answers
Which group of elements is considered the most reactive non-metals?
Answer:D. Noble Gases
The noble gasses are a special group because of their lack of reactivity, the element fluorine is the most reactive nonmetal. It is not found in nature as a free element.#CARRYONLEARNING #STUDYWELLThe halogens will be considered the most reactive non-metals.
What is halogens?The halogens are just a group of 4 - 6 individual elements in a particular periodic table.
What is non-metals?A nonmetal is just a chemical element which lacks the majority of properties associated, ranging from colorless gases to gleaming, high-melting-temperature of the solids.
Each outer shell includes seven electrons, hence group 7 metals would have to gain 1 extra electron to achieve a full outer shell of electrons. When we proceed up the group, this allows us to draw one electron, making it much more reactive.
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If 23.5 g of ammonia (NH3) is dissolved in 1.0 L of solution, what is the molarity?
Answers
Answer:
1.38 M
Explanation:
Need to use the Molarity equation M=n/L
23.5g/ 17.031g/mol NH3 = 1.38 moles
1.38 moles/ 1.0 L = 1.38 M
URGENT HELP
Which of the following experimental plans will test the effects of pressure on a reaction with gases and what is
the expected result?
A Keep temperature constant and increase the pressure of the reaction; reaction rate will increase.
B Keep pressure constant and increase the temperature of the reaction; reaction rate will decrease.
C Keep temperature constant and decrease the pressure of the reaction; reaction rate will increase.
D Keep pressure constant and decrease the temperature of the reaction; reaction rate will increase.
Answers
Keep temperature constant and increase the pressure of the reaction; reaction rate will increase.
option A.
What is Boyle's law?Boyle's law states that pressure of a given mass of a gas is directly proportional to its volume provided, temperature of the gas is kept constant.
Le Chatelier's Principle states that if a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium shifts to counteract the change to reestablish an equilibrium.
So the experimental plans that will test the effects of pressure on a reaction with gases and its expected result is keep temperature constant and increase the pressure of the reaction; reaction rate will increase.
Thus, option A is the correct answer.
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Reaction of sodium hydroxide with sodium chloride
Answers
There will be "no apparent reaction" when sodium hydroxide and sodium chloride react.
Explain the reaction between sodium hydroxide and sodium chloride?A caustic metallic base is sodium hydroxide (Na OH), sometimes referred to as lye or caustic soda. Caustic soda, an alkali, is commonly employed in a variety of sectors, primarily as a potent chemical base in the production of paper, pulp textile, drinking water, as well as detergents. The most widely used base in chemistry labs is sodium hydroxide, which can be used to test for a variety of cations as soon as to produce alkaline media for several reactions, like the Biuret test.While NaCl is a salt, NaOH is a potent alkali. There is no chemical reaction between these two substances. Nothing. There isn't any response.
Thus, there will be "no apparent reaction" when sodium hydroxide and sodium chloride react.
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The complete question is-
Reaction of sodium hydroxide with sodium chloride will produce ______.
A sample of ammonia, NH3, has a mass of 78.25 g. Calculate the number of ammonia molecules in the sample.
number of molecules:
Answers
There are approximately \(2.76 * 10^{24\) ammonia molecules in the given sample.
To calculate the number of ammonia molecules in the sample, we need to use Avogadro's number and the molar mass of ammonia.
The molar mass of ammonia \((NH_3)\) can be calculated by adding up the atomic masses of nitrogen (N) and hydrogen (H):
Molar mass of \(NH_3\) = (1 x atomic mass of N) + (3 x atomic mass of H)
= (1 x 14.01 g/mol) + (3 x 1.01 g/mol)
= 14.01 g/mol + 3.03 g/mol
= 17.04 g/mol
Now, we can calculate the number of moles of ammonia in the sample using the formula:
Number of moles = Mass of the sample / Molar mass
Number of moles = 78.25 g / 17.04 g/mol
≈ 4.5865 mol (rounded to four decimal places)
Finally, we can use Avogadro's number, which represents the number of particles (atoms, molecules, etc.) in one mole of a substance. Avogadro's number is approximately \(6.022 * 10^{23\) particles/mol.
Number of ammonia molecules = Number of moles x Avogadro's number
Number of ammonia molecules ≈ 4.5865 mol x (\(6.022 * 10^{23\) molecules/mol)
≈ \(2.76 * 10^{24\) molecules (rounded to two significant figures)
Therefore, the provided sample contains roughly \(2.76 * 10^{24\) ammonia molecules.
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The number of ammonia molecules in the sample is approximately 2.764 x \(10^{24}\) molecules.
To calculate the number of ammonia molecules in a given sample, we need to use Avogadro's number and the molar mass of ammonia.
The molar mass of ammonia (NH3) is calculated as follows:
Molar mass of N = 14.01 g/mol
Molar mass of H = 1.01 g/mol
Total molar mass of NH3 = 14.01 g/mol + (3 * 1.01 g/mol) = 17.03 g/mol
Now, we can calculate the number of moles of ammonia in the sample:
Number of moles = Mass of sample / Molar mass of NH3
Number of moles = 78.25 g / 17.03 g/mol = 4.594 moles
Next, we use Avogadro's number, which states that there are 6.022 x \(10^{23}\) molecules in one mole of a substance.
Number of molecules = Number of moles * Avogadro's number
Number of molecules = 4.594 moles * 6.022 x \(10^{23}\) molecules/mol = 2.764 x \(10^{24}\) molecules
Therefore, there are approximately 2.764 x \(10^{24}\) ammonia molecules in the given sample of 78.25 g.
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which 5 systems help u change from a child to a adult
Answers
The five systems that helps us grow from a child to adult are excretory, integumentary, digestive, respiratory and cardiovascular system.
What are body systems?The body systems are the combination two or more systems located in the body that helps in the maintenance of hemostasis of the body.
Examples of body systems include the following:
Excretory system: This is the system that contains organs that helps in the removal of metabolic wastes from the body.The integumentary system: This is the system that protects the delicate internal organs of the body.The digestive system: This is the system that helps in the breaking down of food substances for body use.The respiratory system: This is the system that helps in the oxygenation of blood.The cardiovascular system: This is the system that helps in the pumping of blood throughout the body.Learn more about body systems here:
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An atom has 12 protons, 11 neutrons and 12 electrons. What is the mass member of this atom?
Answers
Answer:
the mass is 24
Explanation:
The atomic number is defined as the totall number of electons in the atom in its non bonded state.
Thus the number of electron is 1w, atomic number is also 12.
Mass number is defined as the number of protons + neutrons in the nucleus of an atom.
In this case you have unlimited iron, but only 6.40 moles of oxygen (O2). How much Fe2O3 can you produce?
Answers
Answer: 682 grams
Explanation:
The balanced chemical reaction is:
\(4Fe+3O_2\rightarrow 2Fe_2O_3\)
\(O_2\) is the limiting reagent as it limits the formation of product and \(Fe\) is the excess reagent.
According to stoichiometry :
3 moles of \(O_2\) produce = 2 moles of \(Fe_2O_3\)
Thus 6.40 moles of \(O_2\) will produce=\(\frac{2}{3}\times 6.40=4.27moles\) of \(Fe_2O_3\)
Mass of \(Fe_2O_3=moles\times {\text {Molar mass}}=4.27moles\times 159.69g/mol=682g\)
Thus 682 g of \(Fe_2O_3\) will be produced from 6.40 moles of oxygen
In pea plants, the gene for the color of the seed has two alleles. In the following Punnett square shown below, the dominant allele (Y) represents yellow and the recessive allele (y) represents green.
Punnett Square showing a grid that is blank with 4 empty boxes, two columns and two rows. The female parent plant across the horizontal side, top, of the grid indicates a yellow phenotype and a genotype of Yy. The male parent plant along the vertical side of the grid indicates a yellow phenotype and a genotype of YY.
Based on the Punnett square, what percentage of offspring would be expected to have yellow seeds?
0%
25%
50%
100%
Nvm dont answer
Answers
Answer:
100%
Explanation:
since both genotypes are dominant, and one of them is YY, all of the offspring will be yellow.
100 Points} Name the following compounds from the structures given (images shown below)
1.
2.
3.
4.
5.
6.
Unfortunately, they're not multiple choice, so I have no possible answers to list, I believe 1. might be "2-methylhexane" but I'm unsure how to write the double bond that's shown in the structure, thanks! :)
Edit; the screenshots posted out of order, my apologies :(
Answers
Answer:
1.) There are 6 carbons in the longest possible parent chain (hex-). Since there is a double bond, this is an alkene. The lowest possible carbon the double bond consists of is the 2nd carbon. There is also a methyl group on the 2nd carbon. All together, this makes the structure: 2-methyl-2-hexene.
2.) There are 9 carbons in the longest possible parent chain (non-). The lowest possible carbons the methyl groups are on are the 3rd and 5th carbons. The lowest possible carbon the ethyl group is located on is the 4th carbon. Remember, branches are listed alphabetically. All together, this makes the structure: 4-ethyl-3,5-dimethylnonane.
3.) There are 7 carbons in the longest possible parent chain (hept-). There is a triple bond, making this an alkyne. The lowest possible carbon the triple bond consists of is the 2nd carbon. The lowest possible carbon the methyl group is on is the 4th carbon. All together, this makes the structure: 4-methyl-2-heptyne.
4.) There are 10 carbons in the longest possible parent chain (dec-). The lowest possible carbon the propyl group is on is the 5th carbon. All together, this structure is: 5-propyldecane.
5.) There are 4 carbons in the longest possible parent chain (but-). The lowest possible carbon the methyl group is on is the 2nd carbon. All together, this makes the structure: 2-methylbutane.
6.) There are 5 carbons in the longest possible parent chain (pent-). There is a double bond, making the molecule an alkene. The lowest possible carbon the double bond consists of is the 2nd carbon. The lowest possible carbon the methyl group is on is the 2nd carbon. All together, this makes the structure: 2-methyl-2-pentene.
Write the Lewis structure for sis2
Answers
Answer:
N2H4 is straightforward with no double or triple bonds. In the N2H4 Lewis structure the two Nitrogen (N) atoms go in the center (Hydrogen always goes on the outside). Hydrogen (H) only needs two valence electrons to have a full outer shell. In the Lewis structure for N2H4 there are a total of 14 valence electrons.
Suppose that a certain fortunate person has a net worth of $77.0 billion ($ 7.70×1010 ). If her stock has a good year and gains $3.20 billion ( 3.20×109 ) in value, what is her new net worth?
Express your answer to three digits.
Answers
The new net worth of the person is equal to 80.2 × 10⁹.
What are significant digits?Significant figures can be used to generate numbers that will be written in the form of digits. We can also evaluate the number of significant digits by counting the numbers from the 1st non-zero digit placed on the left.
In the case of addition or subtraction, the number of significant figures will be the same as the value with the fewest significant digits.
Given, the net worth of the person, A = 77 billion = $ 77 × 10⁹
The person's stock gains in the following year, I = $ 3.20 billion
I = $ 3.20 × 10⁹
The new net worth of the person, A(new) = A + I
A (new) = 77 × 10⁹ + 3.20 × 10⁹
A (new) = $ 80.2 × 10⁹
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Formaldehyde has a wide range of uses, many of them in manufacturing. Its chemical formula is CH₂O. The model below represents formaldehyde.
Based on the model, which statement best describes formaldehyde molecules?
A. Formaldehyde molecules form an extended structure and cannot freely move past each other.
B. Formaldehyde molecules do not form an extended structure and can freely move past each other.
C. Formaldehyde molecules do not form a repeating pattern and cannot freely move past each other.
D. Formaldehyde molecules form a repeating pattern and can freely move past each other.
Answers
Answer: B
Explanation: Formaldehyde molecules do not form an extended structure and can freely move past each other
Organelles carry out specif functions within the cell. True False
Answers
Answer:
true
Explanation:
One method for preparing a nitrile is the dehydration of a primary amide.
a. True
b. False
Answers
1. Write the IUPAC names for the following 1.1 1.2 N 1.3 O NO2 x Y ·0 OH 5
Answers
1. The IUPAC name of N is nitrogen.
2. Nitrogen dioxide
3.The IUPAC name of O is oxygen
4.The IUPAC name of OH is hydroxyl.
The IUPAC name of ·0 is a radical. It is commonly found in organic chemistry and plays an important role in many reactions.
IUPAC names for the given compounds are:1.1. N: Nitrogen
The IUPAC name of N is nitrogen.
It is a non-metal and belongs to group 15 in the periodic table. It has an electronic configuration of 1s2 2s2 2p3.1.2. NO2: Nitrogen dioxide
Explanation: NO2 is a chemical compound that is formed by the combination of nitrogen and oxygen. It is a reddish-brown gas that has a pungent odor.
The IUPAC name of NO2 is nitrogen dioxide.1.3. O: Oxygen
Explanation: The IUPAC name of O is oxygen.
It is a non-metal and belongs to group 16 in the periodic table. It has an electronic configuration of 1s2 2s2 2p4.
X: UnknownExplanation: No IUPAC name can be given to an unknown compound as the structure and composition are not known.
Y: Hydroxyl Explanation: The IUPAC name of OH is hydroxyl.
It is a functional group that is composed of an oxygen atom and a hydrogen atom (-OH). It is commonly found in alcohols and phenols. ·0: RadicalExplanation: A radical is a molecule or an ion that contains an unpaired electron.
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Note: The complete question is given below
Provide the IUPAC names for the following compounds:
\(CH_3CH_2CH(CH_3)CH_2CH_2CH_2CH_3\)
C6H5CH(CH3)2
H2NCH2CH2CH2CH2CH2NH2
CH3CH2CH2CH2CH2OH
CH3CH2CH2CHOHCH3
HELP ASAP
During the electrolysis of an aqueous solution of sodium nitrate, a gas forms at the anode, what gas is it?
A)
Oxygen
B)
Hydrogen
C)
Sodium
D)
Water
Answers
Answer:
Option A) oxygen
Explanation:
Oxygen gas it the electrolysis of an aqueous solution of sodium nitrate which a gas forms at anode it is called the oxygen gas
maybe this answer might help u out
During the electrolysis of an aqueous solution of sodium nitrate, a gas forms at the anode,Oxygen gas is it. Therefore, option A is correct.
What is electrolysis ?Direct electric current is used in the electrolysis process to accelerate chemical reactions that would not naturally occur. As a step in the electrolytic cell-based separation of elements from naturally existing sources like ores, electrolysis is significant from a commercial standpoint.
The decomposition potential is the voltage required for electrolysis to take place. In words, electrolysis would be referred to as "breakdown using electricity" because the word "lysis" implies to separate or break.
It was a method for acquiring pure elements, which helped with the study of chemical reactions. Since it is frequently employed to separate or get pure elements from naturally existing sources like ores, electrolysis is now significant from a business standpoint.
Thus, option A is correct.
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what is the net inoic equation for Mg(NO3)2 + Na2CO3
Answers
INFORMATION:
We have the next reaction:
- Mg(NO3)2 + Na2CO3
And we must find its net ionic equation
STEP BY STEP EXPLANATION:
To find the net ionic equation, we must follow the next steps
1. We must write the balanced equation
\(Mg(NO_3)_2+Na_2CO_3→MgCO_3+2NaNO_3\)2. We must write the states
\(Mg(NO_3)_2\text{ \lparen aq\rparen }+Na_2CO_3\text{ \lparen aq\rparen }→MgCO_3\text{ \lparen s\rparen }+2NaNO_3\text{ \lparen aq\rparen }\)3. We must split strong electrolytes into ions
\(Mg^{2+}+2NO_3^-+2Na^++CO_3^{2-}→MgCO_3+2Na^++2NO_3^-\)4. We must cross out the spectator ions on both sides
5. Finally, we must write the remaining substances
\(Mg^{2+}\text{ \lparen aq\rparen }+CO_3^{2-}\text{ \lparen aq\rparen }→MgCO_3\text{ \lparen s\rparen }\)ANSWER:
The net ionic equation for Mg(NO3)2 + Na2CO3 is:
3. How can millions of
compounds be made from the
atoms of about 100 elements?
Answers
Answer:
The answer is that compounds are formed when elements are joined and held together by strong forces called chemical bonds. ... Covalent bonds share electrons between atoms in order to fill their electron shells. In the compound, molecules are held together by the attraction between the nucleus and the shared electrons.
Millions of compounds can be made from just 100 elements because the atoms of these 100 elements can combine with each other in different ways to produce countless compounds.
A compound is formed when atoms of two or more elements are chemically combined together.
100 elements can combine with each other in many different ways. For instance, carbon combines with almost all the known elements to form unique compounds in each case depending on the arrangement of atoms of elements or type of element in each of the compounds formed.
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At a particular temperature, the solubility of In2(SO4)3 in water is0.0095 M.What is the value of Ksp?
Answers
Answer
Kps= 8.3568 x 10⁻⁹
Procedure
To calculate the Ksp, we will need the equation for the dissolving process so the equilibrium expression can be written. In this case, we have the following.
In₂(SO₄)₃(s) ==> 2 In³⁺(aq) + 3 SO₄²⁻(aq)
Once we have the equation, the Kps will be calculated as
Ksp = [In³⁺]²[SO₄²⁻]³
Where
[In³⁺] = 2 x 0.0095 M = 0.019 M
[SO₄²⁻] = 3 x 0.0095 M = 0.0285 M
Therefore Ksp= (0.019)²(0.0285)³=8.3568 x 10⁻⁹
Protons have _________ charge?
Answers
Answer:
The answer is:
Protons have Positive Charge
Explanation:
How many atoms in .25 of Fe?
Answers
Answer:
1 mol contains 6.02 x 10^23 molecules. So 0.25 mols will contain 0.25 x 6.02 x 10^23 molecules.
Explanation:
i hope this helps!!!
an ionic bond is a force of _____between anions and ______when combined make _____compounds that are electrically_____
Answers
Solid A at 80°C is immersed in liquid B at 60°C. Which statement correctly describes the energy changes between A and B?
Answers
Heat energy will be released by solid A which will then be absorbed by liquid B.
What is heat energy?
These little particles vibrate back and forth or run into each other constantly. All matter contains a type of energy known as heat (or thermal) energy, which is produced by the movement of particles.
Particle energy increases with temperature. It is possible for some of this energy to be transferred to cooler particles. For instance, in the gas state, when a fast-moving particle strikes a slower-moving particle, some of the energy from the collision is transferred to the slower-moving particle, increasing its speed.
A region of high energy will gradually spread throughout the material as a result of billions of moving particles colliding with one another until thermal equilibrium is established.
Therefore, heat energy will be released by solid A which will then be absorbed by liquid B.
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Which of these has the greatest freezing point depression? Which of these has the greatest freezing point depression? Aqueous solution of NaCl (m = 0.01) Aqueous solution of CaCl2 (m = 0.01) Aqueous solution of C12H22O11 (m = 0.01) Pure water
Answers
The substance with the higher freezing point depression is CaCl2.
What is water's freezing point?Water freezes at 0° C in normal conditions but once water is mixed with other substances this temperature can change.
How does the freezing point change?As previously mentioned, the freezing point changes according to the substance water is mixed with, here are the changes for the listed substances:
Water with NaCl: -3.72 °CWater with CaCl2: -5.58 °C Water with C12H22O11 (Sucrose): -0.68 °C Pure water: No changesBased on this, the one that has the greatest freezing point depression is CaCl2.
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A chemist determines by measurements that 0.065 moles of nitrogen gas participate in a chemical reaction. Calculate the mass of nitrogen
gas that participates.
Round your answer to 2 significant digits.
X
5
Answers
The mass of nitrogen gas that participates is 0.00464.
What is mass?
"Mass is the quantity of matter of a physical body." The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
The molar mass of many compounds can be calculated by dividing the mass of the compound by the number of moles of the compound.
The formula to calculate the mass
mass = moles / molar mass
Given, that the moles of nitrogen gas are 0.065 moles
The molar mass of nitrogen is 14
The mass of nitrogen is to be calculated.
Putting the values in the formula
0.065 / 14 = 0.00464
Therefore, the mass of nitrogen gas is 0.00464.
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What is the mass of the silver sphere in kg?