Answer:
Thomson used creativity to interpret the results of the cathode ray tube experiment. Explain how the atomic theory was modified from Dalton's theory to Rutherford's.
A chemist adds a chemical to pure water and there is a 100-fold increase in the concentration of hydrogen ions. What is the best approximation of the new ph value?.
A chemist adds a chemical to pure water and there is a 100-fold increase in the concentration of hydrogen ions. the new ph value is 5.
What factors influence a solution's pH?The pH of a solution is determined by the concentration of hydrogen ions in that solution. The pH value is the logarithmic value of the inverse of hydrogen ion activity. Because the concentration of hydrogen ions is frequently very low, ion activity is considered to be equal to the concentration of hydrogen ions.
What's the connection between ion activity and pH?The logarithmic value of the inverse of hydrogen ion activity is the pH value. Because the concentration of hydrogen ions is frequently very low, ion activity is assumed to be equal to the concentration of hydrogen ions. The pH is then the logarithm of the inverse of the concentration of hydrogen ions.
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What is the relationship between events and patterns?
O A. Patterns cause events to occur.
B. Events that happen over and over form a pattern.
C. Events explain how patterns work.
D. Patterns explain what causes events to happen.
The correct answer is Events that happen over and over form a pattern.
An Event is a collection of an experiment's results. Say, for instance, that you throw a coin as part of an experiment. This experiment's result is whether the coin lands "heads" or "tails." These can be regarded as the events related to the experiment. Data repetitions in predictable ways are referred to as patternsPattern helps to understand the trend of occuring event. The general format that an event follows is called the pattern. Pattern cannot exist without a number of events. Events, however, sometimes happen randomly.Pattern doesn't explain the cause of the event.Therefore the correct answer is B. Events that happen over and over form a pattern.
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How does the arrangement of atoms or molecules in a gas differ from the arrangements in liquids and solids?
Answer: Gas has loosely packed atoms, liquids have mediumly packed atoms, and solids have tightly packed atoms.
Explanation: Solids have tightly packed atoms which is what keeps them in their defined shape. They have a defined volume and a defined shape.
Liquids have mediumly packed atoms because liquids don't have a definite shape and take the shape of the container they are placed in. It has a definite volume, but an indefinite shape.
Gases have loosely packed atoms because gases can float around anywhere. They don't have a definite volume, and they don't have a definite shape.
how do metals and nonmetals react with acid
Answer:
Metals react with acids to form hydrogen gas with a pop sound and non metals do not react with acids. This is because a substance undergoing react with acids, donates electrons to the H+ ions produced by the acids. But non metals acceptor of electrons and hence they do not donate to the hydrogen ion of the acid. As a result they don't react with dilute acid but there are some exceptions.
A chemical reaction in which bonds are created is usually associated with ________.
A reaction in which bonds are created is usually associated with the Release of energy.
What are the various types of bonds?
There are three sorts of bonds:
1. Electrovalent or electrovalent bond
2. chemical bond
3. dative bond
Electrovalent or electrovalent bond are formed when one or more electrons are transferred from one atom to another.
Covalent bonds are formed when the atoms during a molecule share an equal number of electrons.
A dative bond is one in which both electrons in a shared pair come from the same atom.
Now, atoms tend to stabilize once they form chemical bonds, releasing energy within the process. Energy is released because there's a higher level of stability associated with a low energy level.
Hence, a reaction in which bonds are created is usually associated with the release of energy.
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What volume would a 200 g sample of gold have, if its density is known to be 19.3 g/cm³?
Answer:
The volume that a 200 g gold sample would have is 10.36 mL.
Step-by-step explanation:
In this case it is known that the density of gold is 19.3 g / mL. This indicates that in 1 mL there are 19.3 g. Then the following rule of three can be applied: if 19.3 g is contained in 1 mL, how much volume is 200 g of gold?
volume= 10.36 mL
A 0.372-g sample of naoh(s) is added enough water to make 250.0 ml of solution. the ph of this solution is:______
A 0.372-g sample of sodium hydroxide(s) is added enough water to make 250.0 ml of solution. the ph of this solution is 12.571
gram of sodium hydroxide X 1 mol of NaoH in volume/total vol of NaoH= 0.093ml/250ml=0.372= 12.571
Other names for sodium hydroxide include lye, soda, and caustic soda. Sodium hydroxide is a white, crystalline, odorless solid at room temperature that draws moisture from the atmosphere. It is a product of synthetic manufacturing. It produces significant amounts of heat when dissolved in water or neutralized with acid, which could be enough to ignite combustible objects. It is very corrosive to use sodium hydroxide. In most cases, sodium hydroxide is utilized as a solid or diluted to a 50% solution. The production of soaps, rayon, paper, explosives, dyestuffs, and petroleum products all employ this chemical.
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Round each measurement to three significant figures. Write your answers in scientific notation.
a. 8758.073 meters
b. 435,200,000
c. 0.001552 meter
d. 0.009009 meters
e. 177,888 meters
f. 629.55 meters
Answer: a. 8.76*10^3 meters
b. 4.35*10^8 meters
c. 1.55*10^(-3) meters
d. 9.01*10^(-3) meters
e. 1.78*10^5 meters
f. 6.30*10^2 meters
Explanation:
a. 8758.073 meters=
8000+758.073=
8*1000+758.073/1000 *1000=
8*10^3+0.758073*10^3=
(8+0.758073)*10^3=
8.758073*10^3=
8.758073*10^3=8.76*10^3 meters
b. 435,200,000=
400,000,000+35,200,000=
4*100,000,000+35,200,000/100,000,000 *100,000,000=
4*10^8+0.352*10^8=
4.352*10^8=
4.352*10^8=4.35*10^8 meters
c. 0.001552 meter=
1.552/1000 =
1.552 * 1/1000=1.55*10^(-3) meters
d. 0.009009 meters=
9.009/1000=
9.009*10^(-3)=9.01*10^(-3) meters
e. 177,888 meters=
100,000+77,888=
1*100,000+77,888/100,000 *100,000=
1*10^5+0.77888*10^5=
1.77888*10^5=1.78*10^5 meters
f. 629.55 meters=
6000+29.55=
6*100+29.55/100 *100=
6*10^2+0.2955*10^2=
6.2955*10^2=6.30*10^2 meters
Acteria and archaea fix nitrogen (n2) by reducing it to ammonia (nh3), the form of nitrogen assimilated by plants. the main reservoir of nitrogen is:______
Bacteria and archaea fix nitrogen (n2) by reducing it to ammonia (nh3), the form of nitrogen assimilated by plants. the main reservoir of nitrogen is is the atmosphere.
The transformation of atmospheric Nitrogen N[tex]_{2}[/tex] into ammonia NH[tex]_{3}[/tex] which is a form that plants may use, is known as biological nitrogen fixation. However, eukaryotes do not engage in the process; it is exclusive to bacteria and archaea.
It has long been recognized that some archaea can contribute to the nitrogen cycling processes (albeit some of these organisms were not initially recognized as archaea). These included both assimilatory and dissimilatory activities, such as the fixing of atmospheric nitrogen. However, rather than large terrestrial or aquatic environments, these reactions were linked to extremophilic archaea that are generally found in 'exotic' habitats like hot springs or salt-saturated lakes.
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During the synthesis of which type of molecule is a carboxyl group lost from a fatty acid, and water produced as an end product?
During the synthesis of lipids, a carboxyl group is lost from a fatty acid, and water is produced as an end product. The correct option is A.
What are lipids?Lipids are fatty acids that have two types of ends, a hydrophilic end, and a hydrophobic end. Lipids format the cell membrane structure and functions. They are greasy substances.
When there is a synthesis of lipids, water is produced as the end product and the carboxyl group will lose to form a molecule of fatty acid.
Thus, the correct option is A) lipids, regarding the molecule in which water is lost.
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The question is incomplete. Your most probably complete question is given below:
A) lipids
B) proteins
C) nucleic acids
D) carbohydrates
Hydrophilic molecules that are to be released by cells are stored in membrane-bound structures called:_____
Hydrophilic molecules that are to be released by cells are stored in membrane-bound structures called Secretory vesicles.
The secretory vesicle is a vesicle that mediates the vesicular delivery of cargo - e.g. hormones or neurotransmitters - from an organelle to particular web websites on the molecular membrane, in which it docks and fuses to launch its content.
Secretory vesicles shape from the trans-Golgi network, and they launch their contents to the molecular outside with the aid of using exocytosis in reaction to extracellular signals. The secreted product may be both a small molecule (together with histamine) or a protein (together with a hormone or digestive enzyme).
Vesicles are small systems inside a molecule, together with fluid enclosed with the aid of using a lipid bilayer worried in delivery, buoyancy control, and enzyme storage.
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Convert the following to scientific notation.
1, 0,005 =
2. 5,050,=
3. 0,0008 =
4. 1,000 =
5. 1,000,000, =
6. 0.25 =
7. 0.025 =
8. 0.0025 =
9. 500 =
10. 5,000 =
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A 54-year-old client has a cholesterol level of 240 mg/dl (6.2064 mmol/l). what serum concentration of cholesterol would this client have?
A 54-year-old client has a cholesterol level of 240 mg/dl (6.2064 mmol/l). this client would have a high serum concentration of cholesterol.
Individuals or groups seeking professional advice or services, such as lawyers, accountants, advertising agencies, and architects. Those who receive benefits or services from social welfare corporations, government agencies, etc. Someone who is under the patronage of someone other than the customer.
An example client is a student teaching at a university writing center. A terminal or computer is connected to the server. A person receiving help or advice from a professional (lawyer, accountant, social worker, psychiatrist, etc.). A client, used in home and business networks, is any computer hardware or software device that requests access to services provided by a server. A client is usually considered a requesting program or user in a client/server architecture.
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True or false? the iron recommendation for girls exceeds that of boys during adolescence.
It is true that the iron recommendation for girls exceeds that of boys during adolescence.
During an adolescence, girls and boys require iron for a large growth spurt and the gain of adult phenotypes and biologic rhythms.
In this period of the life, iron recommendation increase in both girls and boys, because of the increase in lean body mass, the expansion of the total blood volume, the increase and start of menstruation at girls.
Iron is essential for oxygen transport, red blood cell creation, cognitive performance and immunological function.
The overall iron requirements for girls are up to twice as boys.
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Which receptors and effectors are involved in the refldex action of:{a} blinking of eyes in light spark {b} withdrawal of hand on touching hot object
The receptor in blinking is receptors present in eyes and the effectors are the muscles in the eyes that cause the eye to contract and thereby encourages blinking of eye.
Receptors are the organs responsible for receiving external stimuli and transmitting them to the Central Nervous System. Effectors are the organs that carry out the central nervous system's instructions in response to external stimuli.
All receptors are essentially supplied by sensory nerves that can carry the stimulus to the CNS. Effectors are primarily supplied by motor nerves, which are capable of carrying instructions from the CNS.
Skin, eye, ear, nose, and tongue are all examples of receptors. Effectors are either muscles or glands.
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The molecular formula for glucose is c6h12o6. What would be the molecular formula for a molecule made by linking three glucose molecules together by dehydration reactions?.
C₁₈H₃₂O₁₆ is the molecular formula called a-maltotriose for a molecule made by linking three glucose molecules together by dehydration reactions.
It is a dehydration reaction, it means that when two molecules are linked together, there will be one molecule of water H₂O removed
A-maltotriose molecule is a trisaccharide molecules which means linkage of three glucose molecules linked with 1,4 glycosidic bond this is called as a-maltotriose which is formed in the reaction as product
The reaction will be:
C₆H₁₁O₅-OH+H-C₆H₁₀O₅-OH+H-C₆H₁₁O₆→C₁₈H₃₂O₁₆+2H₂O
Here one molecule of water H₂O removed.
Therefore molecular formula of the molecule formed will be C₁₈H₃₂O₁₆.
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Which is true about UVA and UVB rays?
A. Both rays can be blocked 100% by sunscreen
B. UVA protects the surface, UVB protects beneath the surface
C UVB rays cause burning, UVA rays cause premature aging
D. UVA rays cause burning, UVB rays cause premature aging
Answer: C. UVA rays cause premature aging and UVB rays cause burning
Explanation: Ultraviolet radiation causes DNA changes in the skin, leading to premature aging and skin cancer. There are three kinds of UV light: UVA light. This form of solar radiation damages skin at all levels—from the surface layer (epidermis) down deep into the dermis.
The organic compounds that are divided into two types, simple and complex, are called _____.
The organic compounds that are divided into two types, simple and complex, are called carbohydrates.
Carbohydrates are diveded into twy types: simple and complex (starches, fiber, glycogen).
Simple carbohydrates are made of one (monosaccaharides) or two sugar units.
Complex carbohydrates are made up of many sugar units.
For example, glucose (C₆H₁₂O₆) is a simple carbohydrate.
Glucose is chemical compound composed of six carbon atoms, twelve hydrogen atoms and six oxygen atoms.
Starch is a polymeric carbohydrate consisting of a large number of glucose units bonded by glycosidic bond. Starch is a white, tasteless and odorless powder that is insoluble in cold water or alcohol.
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Match the definitions with the provided vocabulary words:
The term measurement has to do with the process of obtaining the value of a quantity. There are several units that could be used in measurement but the SI unit is the internationally accepted unit of measurement.
Let us now match the words and the vocabulary;
The quantity includes a decimal determined y the device or instrument - UncertaintyInternational units that are globally accepted - SI unitObservations that are subjective and not numerical - Qualitative dataThe beginning of a word that tells you the multiplier needed - metric prefixHow close your measurement is to your other measurements - precisionThe quantity is a whole number that can be counted - exact numberObservations that are objective and numerical - quantitative dataHow close your measurement is to the true value - AccuracyThe ratio of the absolute error to the accepted true value - percent errorA range of values that includes the true value and is affected by the measuring device - uncertaintyLearn more about error:https://brainly.com/question/19575648
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A 20.00 g mixture of magnesium and zinc metal reacting with excess hydrochloric acid produced 1.152 g of hydrogen gas. what is the percent zinc in the original mixture?
percentage of zinc= 5.985/20 X 100= 29.5%
let x represents zinc and y be magnesium so
Zinc(s) + 2HCl(aq) -----> ZnCl2(aq) + H2(g)
Mg(s) + 2HCl(aq) -----> MgCl2(aq) + H2(g)
1.152 g of hydrogen gas=( x/65.3 + y/24.305) 20
= 3.08 x10^-2 + 0.8295-8.30
=x=5.985
y= 4.015
percentage of zinc= 5.985/20 X 100= 29.5%
The hydrogen gas escapes, so the two products of Zinc Chloride and Magnesium Chloride will then react with Silver Nitrate. Again, I combine both of the reactions
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B. how much of a 5.0 m naoh solution do you need to add to raise the ph to 6.09?
There are 0.037 NaOH will be needed to raise the pH 6.09.
Henderson equation, convey the pH of a buffer solution as a purpose of the concentration of the weak acid or base and the salt constituents of the buffer.
Formula of Henderson equation
pH = pKa + log10 ([A] / [HA])
Basic buffer has a basic pH and is get ready by blend a weak base and its salt with powerful acid.
According to Henderson equation pH of basic buffer is:
pH + pNaOH = 5.0
6.09 + pNaOH = 5.0
pNaOH = 5.0 - 6.09
pNaOH = log(1.09)
pNaOH = 0.037
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Which reactant will be the best reactant for a nucleophilic aromatic substitution?
The reactant that will be the best reactant for a nucleophilic aromatic substitution is NO₂- NO₂. The correct option is b.
What is nucleophilic aromatic substitution?Nucleophilic aromatic substitution is a substitution process of nucleophile substance is substituted by halides in an aromatic ring. Aromatic compounds contain this type of substitution.
In option b, the compound is the one nitroxide group substituted by halogen, that is fluorine. The fluorine group is substituted in these given aromatic compounds.
Thus, the correct option is b, NO₂- NO₂.
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The question is incomplete. Your most probably complete question is given below:
NO₂F
NO₂- NO₂-F
CH₃-O
CH₃-O-F
A prescription calls for the administration of 100 g of mannitol as solution. calculate how many milliosmole of mannitol (molecular weight = 182, nonelectrolytes) is in the dosage
The 100g solution of mannitol has 549.45 millimoles.
Mannitol (C₆H₈(OH)₆) is used in pharmaceutical goods as a sweetener, tablet and capsule diluent, excipient for chewable tablets, tonicity agent, and vehicle (bulking agent) for lyophilized preparations. It is used as a drug to lower elevated intracranial pressure and lower ocular pressure, as in glaucoma.
The molecular weight of mannitol = 182g.
Mass of mannitol given = 100g.
∴ Moles per liter of mannitol = [tex]\frac{Mass of mannitol}{Molecular weight of mannitol}[/tex]
[tex]=\frac{100}{182}[/tex]
= 0.54945 moles
Now,
1 mole = 1000 millimoles
∴ 0.54945 moles of mannitol = [tex]\frac{0.54945 }{1000}[/tex]
= 549.45 millimoles
Hence, the 100g solution of mannitol has 549.45 millimoles.
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3. A screwdriver has the density of 6.8 grams per cubic centimeter (g/cm³). It also has the mass of 5.3
grams (g). What is the screwdrivers volume?
Density is defined as mass of the given matter divided by its volume
it's SI unit is kg/m³
given, density = 6.8 grams per cubic centimeter (g/cm³)
mass = 5.3 grams (g).
D = M ÷ V
V = M ÷ D
V = 5.3 ÷ 6.8
V = 0.77941 g/cm³
density is a physical property.helium is less dense than air while carbon dioxide is more dense than airWhen we heat up an object normally we observe that , they increase in volume, and their density decreases.Temperature greatly affects volume. As temperature increases, the volume of most solids and gases increases which directly impacts densityTo know more about density visit :
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Crack is made by taking powdered cocaine hydrochloride and adding sodium bicarbonate and water. True or false
points
Sodium and chlorine react together to form sodium chloride. Identify the reactant(s) and product(s?
Sodium and chlorine are the two reactants and sodium chloride is the product.
A very reactive metal called sodium interacts with chlorine gas to form sodium chloride, an inert salt. Chlorine gas is reduced to chloride anions whereas sodium is oxidized to sodium cation (Na+) (Cl-).One mole of sodium and two moles of chlorine gas combine to form two moles of sodium chloride.We are aware that chlorine is a very reactive non-metal and that sodium is a very active metal. Typically, non-metals like halogens tend to receive electrons while metals prefer to expel electrons.Chlorine accepts the electron to create the anion Cl-, and sodium rapidly loses its final shell electron to produce the cation Na+.Sodium, a solid reactant, interacts with greenish-yellow gaseous chlorine to form white crystalline sodium chloride.
Therefore, sodium and chlorine are reactants whereas sodium chloride is the product.
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Which statement about Niels Bohr's atomic model is true?
Correct answer is Each orbit has a specific energy level.
According to Bohr's atomic model There is a certain energy for each orbit, with the inner orbit having the lowest energy. As you move farther from the nucleus, the energy of the orbits increases. We can say that the energy of the electrons are quantized if we state that they can only have certain energies.The ground state, also known as the lowest orbit, is where the electron typically resides.A lower energy level to a higher energy level is reached by an atom's electrons by gaining the necessary energy, and a higher energy level to a lower energy level by losing energy.Inner energy levels have low energy and outer or higher energy levels have high energy.Therefore, Correct statement is Each orbit has a specific energy level.
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The complete question is mentioned below:
Which statement about Niels Bohr’s atomic model is true?
a) Higher orbits have lower energies.
b) Each orbit has a specific energy level. c) Electrons can exist in any energy level. d) Orbits close to the nucleus have no energy.
3. Which of the following statements about matter is FALSE?
O Matter can be classified as an element and a mixture.
O Matter is anything that occupies and has mass.
O Matter exhibits two types of change: physical and chemical.
O Mafter refers to everything that makes up the entire universe.
Matter can be classified as element and mixture is a false statement.
Physical and chemical qualities are present in all matter. Physical qualities, such as mass, color, and volume, are characteristics that may be measured by scientists without modifying the makeup of the sample being studied (the amount of space occupied by a sample). Chemical characteristics, such as flammability and susceptibility to corrosion, define a substance's distinctive capacity to reacted to generate new substances. A pure substance's chemical and physical properties are the same in all samples. For instance, pure copper always forms a solid that is reddish-brown in color and dissolves in diluted nitric acid to form a blue solution and a brown vapor (a chemical property).
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In a construction site, a crane lifts 1000kg of concrete mix to the roof top at a height of 20 metres in 50 seconds. find the power of elevator.
On a construction site, a crane lifts 1000kg of concrete mix to the rooftop at a height of 20 meters in 50 seconds, then the power of the elevator would be 3.924 kilowatts.
What is work done?The total amount of energy transferred when a force is applied to move an object through some distance.
The work done is the multiplication of applied force with displacement.
The work done by the elevator = mgh
=1000*9.81*20
=196200 Joules
The power used by the elevator = work done / time
=196200 /50
=3924 watts
Thus, the power used by the elevator would be 3.924 kilowatts.
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The power of elevator is 4,000 w
What is power?
The time rate of doing work or delivering energy, expressible as the amount of work done W, or energy transferred, divided by the time interval t—or W/t is called power.
Given:
Here, the mass of a concrete lift that can carry by a crane to rooftop =1000 kg,
height =20 m,
time taken by crane to lift concrete mix =50 s
assume, acceleration due to gravity i.e. g =10 m/s²
The formula of power is given by:
power = [tex]\frac{mass*acceleration due to gravity*height}{time taken}[/tex]
power of elevator =[tex]\frac{mgh}{t}[/tex]
= [tex]\frac{1000*20*10}{50}[/tex] = 4000 w
Thus, the power of elevator is 4000 w
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If the initial concentration of so2cl2so2cl2 is 0.150 mm , what is the concentration of so2cl2so2cl2 after 190 ss ? [so2cl2]t[so2cl2]t = 1.13 mm submitprevious answersrequest answer
Use integrated first order rate law, which give you the concentration of reactant sulfuryl chloride as function of time t:
ln[SO₂Cl₂] = ln[SO₂Cl₂]₀ - k∙t
([SO₂Cl₂]₀ i the initial concentration and k is the rate constant)
=> [SO₂Cl₂] = e^(ln[SO₂Cl₂]₀ - k∙t) = e^(ln[SO₂Cl₂]₀) ∙ e^( - k∙t)
= [SO₂Cl₂]₀ ∙e^( - k∙t)
The decomposition of SO₂Cl₂ follows the reaction equation
SO₂Cl₂ → SO₂ + Cl₂
So per mole of sulfuryl chloride disappeared one mole of sulfur dioxide is formed. Hence the changes in concentrations of these compounds are related as:
-∆[SO₂Cl₂] = ∆{SO₂] <=> [SO₂Cl₂]₀ - [SO₂Cl₂] = [SO₂] - [SO₂]₀
Assuming there was initially no sulfur dioxide you get for its concentration:
[SO₂] = [SO₂Cl₂]₀ - [SO₂Cl₂]
= [SO₂Cl₂]₀ - [SO₂Cl₂]₀ ∙e^( - k∙t)
= [SO₂Cl₂]₀ ∙(1 - e^( - k∙t))
after 210s starting with 0.150M of [SO₂Cl₂]
[SO₂]= 0.150M ∙(1 - e^( - 1.48×10⁻⁴s⁻¹k ∙ 240s) =
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