PLS HELP ME I HAVE TILL 12
A student collects oxygen gas by displacing water in a test tube. The gas in the tube has a total pressure of 92.3kPa. If the water has a vapor
pressure of 1.82kPa, what is the pressure of oxygen?
a 90.5kPa
b 94.1kPa
c 168.0kPa
d 50.7kPa
Answers
Answer:
alright bud lets see hmm.... the answer is a. 90.5kpa
Explanation:
92.3 kPa - 1.82 kPa = 90.5 kPa
keep up your hope also corrected me if a am wrong in anyway! :)
Related Questions
Complete and balance the molecular equation, including the phases, for the reaction of aqueous potassium sulfate, k2so4 , and aqueous strontium iodide, sri2.
Answers
The complete and balanced molecular equation is-
K₂SO₄(aq) + SrI₂(aq) → KI(aq)+ SrSO₄(s)
Both sides of the reaction must have an equal amount of atoms in each element to balance the equation.
What is a balanced chemical reaction?A balanced chemical reaction is one in which both the reactant and product sides of the reaction include an equal number of atoms from each of the constituent components. For the chemical equation to adhere to the Law of the conservation of mass, it must be balanced.An equation that has the same number of each type of atom on both sides of the arrow is said to represent a balanced chemical reaction. A chemical reaction is represented symbolically in writing by a chemical equation. The chemical(s) used as the reactant(s) are listed on the left and the chemical(s) used as the product(s) are listed on the right. A chemical reaction requires an equal number of atoms in the reactants and products because, according to the rule of conservation of mass, atoms cannot be generated or destroyed throughout the process.How to balance a molecular chemical equation?First of all, identify the most complicated or complex substances.If possible, start with that material and pick an element or elements that are present in only one reactant and one product. To get the same number of atoms of this element(s) on both sides, adjust the coefficients.If polyatomic ions are present on both sides of the chemical equation, they should be balanced as a whole.The remaining atoms are then balanced, typically ending with the substance that is the least complicated and, if necessary, employing fractional coefficients. In order to get whole numbers for the coefficients if a fractional coefficient was used, multiply both sides of the equation by the denominator.To learn more about Molecular equation click on-
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Balanced molecular equation is :
K₂SO₄(aq) + SrI₂(aq) → KI(aq)+ SrSO₄(s)
What is Balanced equation?
If both the reactants and the products of a chemical reaction have the same number of atoms and total charge, the equation for the reaction is said to be balanced. In other words, the mass and charge balances on both sides of the reaction are equal.The equation must be balanced so that each type of atom appears in equal amounts on both the left and right sides of the arrow. This is accomplished by altering the compounds' coefficients (numbers placed in front of compound formulas).In an imbalanced chemical equation, the reactants and products of a reaction are provided, but the amounts required to satisfy the conservation of mass are not given.Learn more about the balanced equation with the help of the given link:
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Pleaseee help ASAP
will mark brainliest!!! <3
Answers
Answer:
Fluorine belongs to the group 7 A so it must have 7 electrons in the oribits so the answer would be A as u count the electrons in the orbits, There are exactly 7 electron
Explanation:
Qu
What can you determine about the feasibility of a
reaction if the enthalpy is positive and the entropy is
negative?
1
A. The reaction will usually occur because it is unlikely the
entropy will be greater than the enthalpy.
B. The Gibbs energy will always be positive, and the reaction will
never be feasible.
C. The Gibbs energy will always be negative, and the reaction will
always be feasible.
D. The reaction could be feasible above a certain temperature,
Reset Selection
Answers
Answer:
B. The Gibbs energy will always be positive, and the reaction will
never be feasible.
Explanation:
The relationship between gibbs fee energy, G, enthalpy, H and Entropy, S is given as;
ΔG = ΔH - TΔS
If enthalpy is positive and entropy is negative, it means that we are going t always have a positive value for the gibbs free energy.
This means the correct option is option B.
identify the organic precursors that can be used to synthesize 2-pentanol in one step either by hydration, substitution, or reduction by sorting the organic compounds into the correct bin.
Answers
To synthesize 2-pentanol in one step by hydration, substitution, or reduction, we need to identify organic precursors that can undergo these reactions. Let's sort the organic compounds into the appropriate bins based on their potential for these reactions:
Hydration:
Alkenes: Alkenes can undergo hydration reactions to form alcohols. For the synthesis of 2-pentanol, an alkene precursor is needed. One possible alkene precursor is 2-pentene.
Substitution:
Alkyl halides: Alkyl halides can undergo substitution reactions, such as nucleophilic substitution, to introduce new functional groups. However, for the synthesis of 2-pentanol, substitution reactions are not the most suitable method.
Reduction:
Aldehydes: Aldehydes can be reduced to form primary alcohols. To synthesize 2-pentanol through reduction, an aldehyde precursor is required. One possible aldehyde precursor is 2-pentanal.
Ketones: Ketones can also be reduced to form secondary alcohols. However, for the synthesis of 2-pentanol, a ketone precursor is not the most appropriate choice.
Based on these considerations, the organic precursors that can be used to synthesize 2-pentanol in one step are:
2-pentene (as an alkene precursor)
2-pentanal (as an aldehyde precursor)
These precursors can undergo the respective reactions (hydration for 2-pentene or reduction for 2-pentanal) to yield 2-pentanol.
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how do you convert the salts of organic acids back into their original form?
Answers
To convert the salts of organic acids back into their original form you have to alter the pH of solution.
What is pH of solution ?pH is a numerical indicator of how acidic or basic aqueous or other liquid solutions . The phrase, which is frequently used in chemistry, biology, and agronomy, converts the hydrogen ion concentration, which typically ranges between 1 and 1014 gram-equivalents per liter, into numbers between 0 and 14.
pH is an important quantity that reflects the chemical conditions of a solution. The pH can control the availability of nutrients, biological functions, microbial activity, and the behavior of chemicals.
You may do this by including a mineral base, such sodium hydroxide. The proton will be eliminated by the mineral base, leaving the original organic molecule. The organic component has lost its charge and is no longer as soluble in water.
Thus, to convert the salts of organic acids back into their original form you have to alter the pH of solution.
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What types of biochemical reactions are primarily reductive in nature?
Answers
The types of biochemical reactions that are primarily reductive in nature are known as reduction reactions. Reduction reactions involve the gain of electrons or the decrease in oxidation state of a molecule, resulting in a reduction in its overall energy or the transfer of electrons from a donor to an acceptor molecule.
One prominent example of a reductive biochemical reaction is photosynthesis, where plants and some bacteria use sunlight energy to convert carbon dioxide (CO2) into glucose. In this process, carbon dioxide is reduced to glucose by accepting electrons and hydrogen atoms from water molecules. Another example is cellular respiration, specifically the electron transport chain, where electrons derived from the breakdown of glucose and other fuel molecules are transferred through a series of redox reactions, resulting in the reduction of molecular oxygen (O2) to water (H2O) as the final electron acceptor.
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How many grams of AgCl are produced from 10.0 g AgNO3?
Answers
Answer:
Equation of Reaction = AgNO3 (aq) + NaCl (aq) → AgCl (s) + NaNO3 (aq)
Steps:
1. Find the moles of AgNO3 with formula n= Mass/Mr (molecular mass)
so you will get moles= 10.0/ 169.87 = 0.05886854654
2. Using stoichiometry you know the equation has 1 mole so the moles of AgCl are gonna be the same; therefore, you will use again the same formula.
3. moles= mass/molecular mass
0.05886854654 = x/ 143.32
You rearrange the formula to find the mass
so mass = moles x molecular mass
mass = 0.05886854654 x 143.32
mass= 8.44 grams
Explanation:
The temperature of a plasma is often ________ compared to the temperatures of gases, liquids, or solids.
Answers
The temperature of a plasma is often higher compared to the temperatures of gases, liquids, or solids.
Plasma is a state of matter that exists at very high temperatures, typically in the range of thousands to millions of degrees Celsius.
At such high temperatures, the atoms and molecules in the plasma gain enough energy to ionize, meaning they lose or gain electrons, resulting in a mixture of charged particles.
This ionization gives plasma its unique properties and behavior.
Plasma is commonly found in phenomena such as lightning, stars, and certain laboratory conditions. Its high temperature is necessary for sustaining the ionization and allowing the plasma to exhibit characteristics such as electrical conductivity and the ability to generate magnetic fields.
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Lina has worked hard to gather data for her experiments. With her last set of data she received, she is ready to publish her paper in
a peer-reviewed journal. In order to do that, she has to make sure that all of her data has consistent SI units, significant figures and
in scientific notation if necessary. Help Jessica get all of her data in order. How many significant figures are in 43.8lbs?
Answers
43.8 has 3 significant figures and 1 decimal.
What are significant figures?The term significant figures refer to the number of important single digits (0 through 9 inclusive) in the coefficient of an expression in scientific notation.
All zeros that occur between any two non-zero digits are significant. For example, 108.0097 contains seven significant digits. All zeros that are on the right of a decimal point and also to the left of a non-zero digit are never significant. For example, 0.00798 contained three significant digits.
Hence, 43.8 has 3 significant figures and 1 decimal.
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How many years of science are required for high school graduation
Answers
The number of years of science required for high school graduation can vary depending on the educational system and specific graduation requirements of the school or district. In many educational systems, including the United States, three years of science coursework are typically required for high school graduation. These courses often cover subjects such as biology, chemistry, and physics. However, it's essential to check with the specific educational institution or local education authorities to determine the exact science requirements for high school graduation in a particular area.\(\)
Which statement best describes a benefit of conducting a comparative investigation over collecting data from the Internet?
A comparative investigation can be repeated in a short time while collecting the continuous data from the Internet takes longer.
Conducting a comparative investigation is always less expensive than an investigation in which data is obtained from the Internet.
Conducting a comparative investigation is always less time consuming than obtaining data from the Internet.
A comparative investigation can provide a wider range of data than can be obtained from the Internet.
Answers
The correct expression which best reveals the advantage of conducting a comparative investigation over collecting data from the Internet is:
A comparative investigation can provide a wider range of data than can be obtained from the Internet
The correct answer choice is option d.
How a comparative investigation provides numerous information.When making a research or investigation in certain areas such as the ones which involves comparative investigation, one great benefit of it is that it opens our eyes of understanding to get, see and understand information clearly in a function of their differences and similarities.
So therefore, we can now confirm that ease with with the compare the variation and similarities in comparative investigation is one of its advantage over data collection from the website.
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Susan is investigating physical changes. To do this, she places some ice into a large bowl and seals it with a lid. She leaves the bowl on the counter for several hours until all of the ice has melted. Using a balance, Susan determines that the mass of both the water and the ice are equal. Why is the mass of the ice and the water the same? (SC.8.P.9.1)
Answers
Answer:
No mass loss
Explanation:
The mass of ice and the water in the different state are equal because the same of quantity of matter is present in both state of matter of matter.
In essence, the mass of the physical change process is conserved. When mass is conserved, matter is neither created nor destroyed but can be changed from one form to the other. This is in compliance with the law of conservation of matter. So, no mass was lost in the physical change process and the mass will remain the same.The leaf's cuticle
a. stores water.
c. transports water in the leaſ.
b. reduces evaporation.
d. absorbs water for the leaf.
Answers
Which bonds guarantee that the recipients of permits will comply with the ordinances associated with the use of such permits?
Answers
License and permits bond.
License and permits bond guarantee that the recipients of permits will comply with the ordinances associated with the use of such permits.
What is a license and permit bond?By ensuring that firms will abide by laws and other rules upheld by federal, state, and local government authorities, license and permit bonds shield consumers from harm. Each licensing bond is specific to a certain business and guards against potential harm to customers or the state. Governments and consumers are shielded by license bonds from the fraudulent activities of the bonded company. Before being allowed to operate businesses in a variety of industries must acquire a license and a permission surety bond.Give an example of license and permit bond:
Airline Reporting Bond
Bonds issued by airline reporting commissions (ARC) ensure that funds received by travel agencies are forwarded to the correct airline. An ARC bond claim may be made if someone pays a travel agent, but the agent fails to transmit the money to the correct airline. Federal law requires ARC bonds, thus each state must be covered by one.To learn more about license and permits visit:
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regardless of where you live and what tempurature it is outside, you should always start the vehicle and give it a few minutes to warm up
Answers
The statement given is true. No matter where you live or what the outside temperature is, you should always start your vehicle and let it warm up for a few minutes.
Define temperature.An object's thermal energy content is measured by its temperature, while heat is the movement of thermal energy between objects of different temperatures.
The average kinetic energy of all the atoms or molecules that make up matter defines temperature in chemistry. Not all materials have the same kinetic energy. A particle can be described using the kinetic energy distribution of the particle at a point in time.
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The complete question is as follows:
Regardless of where you live and what temperature it is outside, you should always start the vehicle and give it a few minutes to warm up. (True/False)
Ca is an atom. Why?
Help me asap pleased
Answers
Answer:
It has protons, neutrons and electrons
Which of the following statements is true about cells?
A. All cells look the same.
B. All cells perform the same function.
O C. All cells perform specialized functions.
O D. All cells are prokaryotic.
Answers
Answer:
Explanation: i think it is C if i'am wrong i'am sorry
EXTRA POINTS!
Which organism has Ganglia?
A: Sponge
B: fish
C: hydra
D: flatworm
Answers
Answer:
flatworm
Explanation:
Answer:
D.) Flatworm
Explanation:
Took the test :)
why is citric acid added to food?to add colorto add tartnessto add bitternessto add sweetness
Answers
Citric acid is added to food to add tartness and enhance the flavor. The correct option is b.
Citric acid, a natural compound found in citrus fruits, is commonly added to food for its tart flavor and ability to enhance taste. Here's a step-by-step explanation:
1. Tartness: Citric acid is highly acidic and has a sour taste. When added to food, it provides a sharp, tangy flavor that adds tartness. This tartness can help balance the overall taste profile of a dish, especially in sweet or savory recipes.
2. Flavor enhancement: Citric acid acts as a flavor enhancer, intensifying the existing flavors in food. It has the ability to enhance the perception of other taste sensations, such as sweetness and saltiness, making food taste more vibrant and flavorful.
3. Preservation: Citric acid also acts as a natural preservative in some food products. It has antimicrobial properties that inhibit the growth of certain bacteria and fungi, helping to extend the shelf life of foods and prevent spoilage.
4. pH adjustment: Citric acid can be used to adjust the pH level of certain food products. It is commonly used in canning and preserving processes to create an acidic environment that inhibits bacterial growth and helps maintain product quality and safety.
Overall, the addition of citric acid to food primarily serves to enhance flavor, provide tartness, and potentially contribute to preservation. Option b is the correct one.
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Physical properties like hardness, melting point, and boiling point depend on
Answers
Answer:
depend on nature of matter
Answer:
It depends on the temperature and how the molecules react
A buffer solution is prepared that is 0.18 M NH3 and 0.27 M NH4Cl. What is the pH of this buffer? Kb for NH3 is 1.8 x 10-5
A. 4.57
B. 9.26
C. 9.43
D. 4.92
E. 9.08
Answers
Option E is Answer. The pH value of the buffer is 9.08
The pH of a solution: It is a measure of hydrogen ion concentration, which in turn is a measure of its own acidity. Pure water dissociates slightly into equal concentrations of hydrogen and hydroxyl (OH−) ions.
The pH is then calculated using the expression:
pH = - log [OH-].-------------(1)
the pH of acidic buffer =pka+log[ acid/salt]
the pH of basic buffer =pkb+log[ base/salt]
Given that Kb=1.8x10^-5
base=0.27M
salt=0.18M
first, we have to calculate the value of kb,
pkb=−log[1.8×10 ^−5]
pkb=4.74
The pH of buffer=pkb+log[base/salt]-------------(2)
We find out the value of kb and now substitute it in equation(2)
pOH=4.74+log[ 0.27/0.18]
=4.74−0.176=4.92
pH=14−4.92=9.08
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If a nitrogen atom has 7 protons and 7 neutrons, what is its mass?
Answers
so that’s simple
7 + 7=14!
estion 2
Where are the non-metals on the periodic table?
Answers
Answer: nonmetals are located on the upper right
Explanation:
HELP FAST!!!!!!!!!!!!! Acetic acid systematically named ethanoic acid is an acidic, colorless liquid and organic compound with the chemical formula C2H4O2.
After adding 5-8% of acetic acid in water it becomes vinegar and is mostly used as preservatives in pickles.
The adjacent figure shows Lewis structure for acetic acid.
Indicate the number of sigma and pi bonds in the adjacent figure. State the meaning of sigma and pi bonds.
Answers
In acetic acid molecule, there are seven sigma bonds and one pi bond.
What are sigma and pi bonds?We know that the chemical bonds that are found in a substances are responsible for the joining of the atoms of the substance together. This implies that a bond is said to be formed any time that two atoms have been joined together in a molecule.
In this case, we have a molecule of acetic acid. There are several bonds that are formed as the atoms that form the acetic acid are being joined together. These bonds fall into two categories, the sigma bonds and the pi bonds.
The sigma bond are the bonds that are single bonds while the pi bonds are the bonds that are multiple bonds, we can know the sigma and the pi bonds by a close examination of the molecule as shown.
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Which is the best reason for choosing the beaker for heating the solution? the beaker is the only container that can withstand high temperatures. the beaker's wide mouth allows the thermometer to rest against the side. the beaker will not tip over when placed on the hot plate. the beaker is unbreakable.
Answers
The selection of the beaker for heating the solution:
The best reason for choosing the beaker for heating the solution is "The beaker will not tip over when placed on the hot plate".
What is a Beaker?:
A glass container with a flat bottom and a tiny pouring mouth is known as a beaker. It is employed in the chemistry lab to stir, heat, and mix liquids.Beakers can be heated on a hot plate directly. Because of their flat bottoms, these containers will uniformly distribute heat when the mixture is shaken. It is best to heat indirectly any other container without a flat surface.Borosilicate glass, which is frequently used to make glass beakers, has boron trioxide, which gives it the ability to withstand sharp temperature changes. It can endure temperatures of up to 400°C.
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w
In your own words, what does the law of
conservation of energy tell us? Hint: It is
VERY similar to the law of conservation
of matter (we studied that in the first
semester).
Answers
Answer:
The law of conservation of mass States that matter can never be created or destroyed during c
The cultures of prehistoric humans are known mostly through the excavation of stone tools and other relatively imperishable artifacts. The early tool making traditions are often referred to as being paleolithic (literally "Old Stone Age). The Oldowan and Acheulian tool traditions of the first humans were the simplest applied research basic research Scientihe thought O philosophies technologies
Answers
The cultures of prehistoric humans are primarily known through the excavation of stone tools and other durable artifacts, such as the Oldowan and Acheulian tool traditions.
Stone tools and imperishable artifacts serve as key archaeological evidence for understanding prehistoric cultures. Through meticulous excavation and analysis, archaeologists have been able to piece together the lifestyles, technological advancements, and social behaviors of early human societies. The term "paleolithic" refers to the Old Stone Age, a time when humans relied on stone tools as their primary implements.
The Oldowan tool tradition is considered the earliest stone tool industry, dating back around 2.6 million years ago. It is characterized by simple tools, such as choppers and scrapers, which were crafted by flaking off pieces from larger stones. These tools were primarily used for basic activities like butchering and processing animal carcasses.
Later, the Acheulian tool tradition emerged around 1.76 million years ago, representing an advancement in stone tool technology. Acheulian tools, such as handaxes and cleavers, were more refined and standardized, showcasing an increased level of sophistication in tool-making techniques. These tools served a wide range of purposes, including hunting, woodworking, and shaping raw materials.
By studying the Oldowan and Acheulian tool traditions, researchers gain valuable insights into the cognitive abilities, cultural development, and technological progress of early humans. The examination of these artifacts provides evidence of their adaptability, problem-solving skills, and the gradual refinement of their tool-making techniques over time.
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A 5.00 g sample of hydrated sodium tetraborate, Na2B4O7 x nH2O is heated to drive off the water. After heating, 2.64 g of anhydrous Na2B4O7 reasons. What is the value of "n" in the hydrate formula
Answers
The value of ''n" in the hydrate formula is 10
Moles of anhydrous sodium tetraborate:Mass of anhydrous NA2B4O7 = 2.64g
Molar mass of NA2B4O7 = 201.224 g/mol
Number of Moles of anhydrous NA2B4O7 = Mass of NA2B4O7 / Molar mass of NA2B4O7
= 2.64 / 201.224
= 0.0131 mol
Mass of water in 5.00g of NA2B4O7 = 5.00 - 2.64
= 2.36 g
Moles of water = 2.36 / 18.015
= 0.1307 mol
The whole number ratio = moles of water / moles of anhydrous sodium tetra borate
= 0.1307 / 0.0131
The whole number ratio = 10
Hence the value of n in the hydrate formula is 10.
NA2B4O7. 10H2O
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The value of Ka for nitrous acid (HNO2) at 25 ∘C is 4.5×10−4
Part A Write the chemical equation for the equilibrium that corresponds to Ka.
Part B By using the value of Ka, calculate ΔG∘ for the dissociation of nitrous acid in aqueous solution.
Part C What is the value of ΔG at equilibrium?
Part D What is the value of ΔG when [H+] = 5.4×10−2 M , [NO−2] = 6.0×10−4 M , and [HNO2] = 0.21 M ?
Answers
Part A: The chemical equation for the equilibrium that corresponds to Ka is: HNO2(aq) ⇌ H+(aq) + NO2-(aq)
Part B: Using the value of Ka, the ΔG∘ for the dissociation of nitrous acid in aqueous solution can be calculated as follows: ΔG∘ = -RTln(Ka) = -8.314 J/mol-K × 298 K × ln(4.5×10−4) = -126.6 kJ/mol
Part C: The value of ΔG at equilibrium is 0 because the system is at equilibrium.
Part D: At the given concentrations, the value of ΔG is not 0; instead, it is ΔG = -RTln([H+][NO2-] / [HNO2]) = -8.314 J/mol-K × 298 K × ln(5.4×10−2 × 6.0×10−4 / 0.21) = -34.7 kJ/mol.
This value is lower than the ΔG∘ of -126.6 kJ/mol, indicating that the reaction will favor the products (H+ and NO2-) over the reactants (HNO2). This is because the concentrations of the products are greater than their equilibrium concentrations, so the reaction will shift to the right in order to reach equilibrium.
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PLEASE HELP ASAP The molecular weight of oxygen gas (O2) is 32 g/mol. What is the mass of a single oxygen atom? 2.66 x 10-23 g 3.13 x 10-1 g 1.06 x 10-23 g 5.31 x 10-23 g
Answers
Answer:
5.31×10¯²³ g.
Explanation:
Data obtained from the question include:
Molar weight of O2 = 32 g/mol
Mass of 1 oxygen atom =..?
From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ atoms.
This implies that 1 mole of O2 also contains 6.02×10²³ atoms.
1 mole of O2 = 32 g
The mass of 1 atom of O2 can be obtained as follow:
32 g of O2 contains 6.02×10²³ atoms.
Therefore Xg of O2 will contain 1 atom i.e
Xg of O2 = 32/6.02×10²³
Xg of O2 = 5.31×10¯²³ g
Therefore, the mass of a single oxygen atom is 5.31×10¯²³ g.
The mass of a single oxygen atom is 5.31 x 10⁻²³ grams. Therefore, option D is correct.
The molecular weight of oxygen gas is 32 g/mol. To find the mass of a single oxygen atom, divide the molecular weight by Avogadro's number (6.022 x 10²³ atoms/mol).
Avogadro's number (6.022 x 10²³) represents the number of particles (atoms, molecules, or ions) in one mole of a substance.
To find the mass of a single oxygen atom, divide the molecular weight of oxygen gas by Avogadro's number:
Mass of a single oxygen atom = (32 g/mol) / (6.022 x 10²³ atoms/mol)
Simplifying the expression:
Mass of a single oxygen atom = 5.31 x 10⁻²³ g
Therefore, the mass of a single oxygen atom is 5.31 x 10⁻²³ grams.
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