The pure gas has a pressure of 0.573 atm.
How does pressure work?Pressure is the amount of force applied perpendicularly to an object's surface divided by the surface area across which it is applied. In comparison to the surrounding pressure, gauge pressure is the pressure. Pressure is expressed using a variety of units.
What in chemistry is ATM?The definition of the standard atmosphere, or atm, as a unit of pressure is 101325 Pa. It is occasionally used as a standard pressure or a reference pressure. It roughly corresponds to the average atmospheric pressure at sea level on Earth.
based on the specified value;
we know that,
P(t)=P(water)+P(pure gas)
where,
P(t)=TOTAL PRESSURE OF THE GAS
P(water)= Vapour pressure of water
P(pure gas)=Pressure of pure gas
GIVEN;
P(pure gas)=P(t)-P(water)
=(453.0-17.5)
=435.5 torr
or P(pure gas)=435.5/760
=0.573
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The emission spectrum of cesium contains two lines whose frequencies are (a)
3.45 xx 10¹4 Hz and (b) 6.53 xx 10¹4 Hz. What are the wavelengths and energies per
photon of the two lines? What color are the lines?
The lines are violet and blue respectively.
What is the energy?We know that the energy of the photon could be obtained by the use of the equation;
E = hf
E = energy
h = Plank's constant
f = frequency
For the first line;
E = 6.6 * 10^-34 Js * 3.45 x 10^14 Hz = 2.3 * 10^-19 J
Given that;
E = hc/λ
λ = hc/E
λ = 6.6 * 10^-34 * 3 * 10^8/2.3 * 10^-19
λ = 8.61 * 10^-7 m or 861 nm
The color is violet
For the second line;
E = 6.6 * 10^-34 Js * 6.53 xx 10^14 Hz
E = 4.3 * 10^-19 J
E = hc/λ
λ = hc/E
λ = 6.6 * 10^-34 * 3 * 10^8/4.3 * 10^-19
λ = 4.60 * 10^- 7 m or 460 nm
The color is blue
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How many moles (of molecules or formula units) are in each sample?
Express your answer in moles to three significant figures.
1) 18.0 g NO2
2) 1.35 kg CO2
3) 46.1 g KNO3
4) 191.8 kg Na2SO4
The number of moles in each sample will be 0.391 moles, 30.7 moles, 0.456 moles, and 1350 moles
What is the number of moles?The number of moles of a substance is the ratio of the mass of the substance to the molar mass.
In other words; mole = mass/molar mass.
Thus:
moles of 18.0 g [tex]NO_2[/tex] = 18.0/46= 0.391 moles
moles of 1.35 kg [tex]CO_2[/tex] = 1350/44= 30.7 moles
moles of 46.1 g [tex]KNO_3[/tex] = 46.1/101.1= 0.456 moles
moles of 191.8 kg [tex]Na_2SO_4[/tex] = 191800/142= 1350 moles
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which statement concerning the oxygen level in the lake can be inferred from the graphs. 1) the increase of the sewage waste from 1950 to 1970 was due to decreasing human population. 2) the decreasing and sewage Way shows the environmental problems associated with the lamb population have been solved. 3) sewage waste is a good source of nutrients for most of fish.4) increases in sewage ways were responsible for decreasing oxygen levels in the lake
Increases in sewage waste were responsible for decreasing oxygen levels in the lake
Humans does have the impact on the environment in several ways. Common effects includes lowered water quality, elevated pollution and greenhouse gas emissions, depletion of natural resources and contribution to global climate change.
As global temperatures increasing , weather patterns on earth will dangererously change. While some areas will have longer growing seasons, others will become drought wastelands as water will decrease in vast areas, turning once floral regions into deserts. The elevation will impact weather patterns, provoking more intense hurricanes in both size and frequency, as well as intensifying and prolonging droughts and heat waves. But air pollution not only just effect the environment . The evidence is increasing that poor air quality and rising temperatures are ruining delicate ecosystems, even led to increased asthma and cancer rates in humans.
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A "fuzzy cloud" around the nucleus of an atom where an electron is likely to
be found is called
a) an orbital b) valence shell c) ground state
d) none of these
A "fuzzy cloud" around the nucleus of an atom where an electron is likely to be found will be called an orbital. Option A.
What are orbitals?Orbitals are regions within the atom where electrons can be found.
A typical electron contains electrons that are negatively charged, protons that are positively charged, and neutrons that have no charges.
The positively charged protons and neutral neutrons form the core or the nucleus of the atom. The electrons, on the other hand, are located outside the nucleus.
The regions where electrons of atoms are located are collectively called orbitals.
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Can somebody help me if you know what this is
10
Determine the formal charges on all atoms in the molecules.
a. :N=N=N:
b. : CEO:
C.
:0:
O.N.O
Formal charge = number of valence electron - 1/2 bonded electron - lone pair electron
a. N3 = number of valence electron - 1/2 bonded electron - lone pair e-
= 5 - 2/4 - 4
= -1
b. CO = number of valence electron - 1/2 bonded electron - lone pair e-
Charge on carbon
= 4 - 2 - 6/2
= -1
charge on oxygen
number of valence electron - 1/2 bonded electron - lone pair e-
= 6 - 2 - 6/2
= +1
c. NO3
by making structure we found that each oxygen has different charge in this compound.
O = -1, -1 , 0
N = 0
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what is the volume in milliliter of 7.44 g of acetone
The volume in milliliter of 7.44 g of acetone 9.4897 mL
It is necessary to understand a substance's mass, volume, and density in order to answer this question. By dividing a material's mass by volume, the density of the substance may be calculated. The equation for density may now be written in mathematical form using the expression for density, and the equation for mass can be produced by rearrangement using the equation for density as a starting point.
Mass of acetone = 7.44 g (given)
Volume of acetone (v) = mass of acetone ÷ density of acetone
V = 7.44 g ÷ 0.784 g/mL
V = 9.4897 mL
Hence volume of acetone = 9.4897 mL
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Write a balanced redox reaction between acidified potassium permanganate and iron two chloride and predict if the reaction is spontaneous Emno.4/Mn^2+=1.74v fe^2+|fe^3+=0.75
The balanced redox reaction between acidified potassium and iron two chloride is given as ,
5[tex]Fe^{+2}[/tex] + 1 [tex]MnO_{4} ^{- }[/tex] + 8 [tex]H^{+}[/tex]→ 5[tex]Fe^{+3}[/tex] ++ 1 [tex]Mn^{+2 }[/tex] + 4[tex]H_{2} O[/tex]
The reaction is spontaneous
Place these numbers as coefficients in front of the formulas containing those atoms.
[tex]Fe^{+2}[/tex] + [tex]MnO_{4} ^{- }[/tex] → [tex]Fe^{+3}[/tex] + [tex]Mn^{+2 }[/tex]
Balance all remaining atoms other than H and O
[tex]Fe^{+2}[/tex] + [tex]MnO_{4} ^{- }[/tex] → [tex]Fe^{+3}[/tex] + [tex]Mn^{+2 }[/tex]
Balance O.
Add enough H2O molecules to the deficient side to balance O.
We have 4O atoms on the left, so we need 4H2O
on the right.
5[tex]Fe^{+2}[/tex] + 1 [tex]MnO_{4} ^{- }[/tex] + 8 [tex]H^{+}[/tex]→ 5[tex]Fe^{+3}[/tex] + 1 [tex]Mn^{+2 }[/tex] + 4[tex]H_{2} O[/tex]
The reaction is spontaneous when the value of E ° for the reaction is positive .
E ° for [tex]MnO_{4} ^{- }[/tex]/ [tex]Mn^{+2 }[/tex] = 1.74 V
E ° = [tex]Fe^{+3}[/tex]/ [tex]Fe^{+2}[/tex] = 0.75 V
E ° for reaction = 1.74 V - 0.75 V = 0.99 V
Hence , E ° for reaction is positive .
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Question 2 of 10
Which chemical equation is balanced?
A. CO₂ + H₂O → H₂CO₂
B. K+ H₂O → K₂O + H₂
C. CaO2 + HCl → CaCl₂ + H₂O
OD. MgO + 2HCl → MgCl₂ + H₂O
The equation MgO + 2HCl → MgCl₂ + H₂O is a balanced equation.
A balanced chemical equation contains equal number of atoms on both sides of the equation.The equation is MgO + 2HCl → MgCl₂ + H₂O which contains 1 atom of Mg, 2 atoms of chlorine, 2 atoms of chlorine, 1 atom of oxygen on both reactants and products sides.So the equation is balanced.An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same number of atoms and total charge for each component of the reaction. In other words, both sides of the reaction have equal amounts of mass and charge.It follows law of conservation of mass.Mass is neither created nor destroyed rather it can be transferred from one form to another.Learn more about balanced equation at:
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The accepted value for the density of iron is 7.9 g/mL. Four student groups examine the density of iron in the lab. Which of the following experimental results are most precise?
For 5.43 g/mL and 5.44 g/mL = 0.01 the least diff and most precise.
First of all, precision is determined by the difference in the two obtained values. If the difference between the two values obtained is less, then precision is more. If the difference between the two values obtained is more, then precision is less.
For 5.43 g/mL and 5.44 g/mL , we can see that the difference between these two data is 0.01
For 7.98 g/mL and 7.91 g/mL , we can see that the difference between these two data is 0.07
For 7.65 g/mL and 7.64 g/mL , we can see that the difference between these two data is 0.01
For 7.06 g/mL and 7.03 g/mL , we can see that the difference between these two data is 0.03
As we can see that, the most difference between the data is 0.07 between 7.65 g/mL and 7.64 g/mL and thus, they are least precise.
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Choose one of the following articles to read. Then you will summarize the article in 3-5 sentences and give a 2-3 sentence reflection on your personal thoughts on the article. Your answer must be in complete sentences and use proper sentence structure. Your answers must contain the listed terms and use them in the correct context. CAPITALIZZE the listed term within your answer. Label your answer the with question # you choose.
Do Astronauts need sunscreen in space?
Be sure to use the following terms in your summary: ultraviolet radiation, electromagnetic waves, wavelength
Why is the color blue so rare in nature?
Be sure to use the following terms in your summary: waves, visible light, wavelengths
Explain the difference between radiation and radioactivity
Be sure to use the following terms in your summary: electron, wave, electromagnetic radiation
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ASAP HELP
When one molecule of sucrose is burned with oxygen to make carbon dioxide and water, how
many carbon dioxides are made? Hint, carbon dioxide is CO2.
6 12 1 24
One molecule of sucrose is burned with oxygen to make carbon dioxide and water.
Disaccharide sugar sucrose is composed of glucose and fructose. It is produced naturally by plants and is the main component of white sugar. C₁₂H₂₂O₁₁ is the chemical formula for it.
Extraction and refining sucrose for human use can be done from either sugarcane or sugar beet. Raw sugar is created from crushing the cane, which is consistently delivered to other sectors to be refined into pure sucrose. Sugar mills generally are located in the tropical regions near the sugarcane plantations.
C₁₂H₂₂O₁₁ + 12O₂ → 12CO₂ + 11H₂O
When one molecule of sucrose is burnt, we get 12 carbon dioxide molecules.
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How many moles of calcium do you have if you measure out 19.13 g of calcium?
Answer:
0.4773 moles Ca
Explanation:
To find the amount of moles, you need to multiply the mass (g) by the atomic mass of calcium. The atomic mass compares the mass of calcium per every one mole. It is important to arrange the ratio in a way that allows for the cancellation of units (grams should be in the denominator). The final answer should have 4 sig figs to match the given value.
Atomic Mass (Ca): 40.078 g/mol
19.13 g Ca 1 mole
------------------- x ------------------- = 0.4773 moles Ca
40.078 g
The nucleus of an atom contains which subatomic partcles?
Answer:
The nucleus contains two types of subatomic particles, protons and neutrons. The protons have a positive electrical charge and the neutrons have no electrical charge. A third type of subatomic particle, electrons, move around the nucleus. The electrons have a negative electrical charge.
HELP PLEASE!!! HELP!!! manuel tested the effects of temperature on solubility of sugar in water. he measured the maximum amount of sucrose (in grans) he could dissolve in 100 g of water. manuel repeated the test at five different temperatures. the graph of his results are below
based on his observations which of the following is a general hypothesis manuel might form?
a) the solubility of a solid increases as the temperature increases
b the solubility of a solid decreases as temperature increases
c) the decreasing solubility of solid raises the temperature of water
Answer:
A
Explanation:
A rise in temperature means that there is more thermal energy which will be used in the reaction by the sugar/sucrose, that is why solubility increases with temperature increase
Answer: The solubility of a solid increases as the temperature increases.
Explanation: THE ANSWER!! okay everbody
What is the meaning of electronegativity
Answer:
Electronegativity is the ability of an atom to attract the shared pair of electrons towards itself *in a molecule*
In ironmaking, iron metal can be separated from iron ore (Fe2O3) by heating the ore in a blast furnace in the presence of coke, which is a form of carbon: 2 Fe2O3(s) + 3 C(s) → 4 Fe(s) + 3 CO2(g) If 1000 kg of iron ore and 120 kg of coke are heated in a blast furnace, determine the limiting reactant, the theoretical yield of iron metal, and the theoretical yield of carbon dioxide.
The limiting reactant is iron ore, the theoretical yield of iron metal is 701.344 kg, and the theoretical yield of carbon dioxide is 413.292 kg.
Stoichiometric problemFrom the equation of the reaction:
[tex]2 Fe_2O_3(s) + 3 C(s) --- > 4 Fe(s) + 3 CO_2(g)[/tex]
The mole ratio of iron ore to carbon is 2:3.
Mole of 1000 kg of iron ore = 1000000/159.69
= 6,262 moles
Mole of 120 kg carbon = 120000/12
= 10,000 moles
Thus, it appears that the carbon is in excess while the iron ore is limited in availability.
The mole ratio of the iron ore and the iron produced is 1:2. Thus, the equivalent number of moles of iron produced will be:
6,262 x 2 = 12,524 moles
Mass of 12,524 moles of iron = 12,524 x 56
= 701,344 g or 701.344 kg
Thus, the theoretical yield of iron is 701.344 kg.
The mole ratio of the iron ore and the carbon dioxide produced is 2:3. The equivalent mole of carbon dioxide produced will be:
6,262 x 3/2 = 9,393 moles
Mass of 9,393 moles carbon dioxide = 9,393 x 44
= 413,292 or 413.292 kg
The theoretical yield of carbon dioxide is, therefore, 413.292 kg.
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Madison lives near the ocean. She’s formed a hypothesis that increased concentrations of salt in the air speeds the corrosion of certain metals. If Madison plans to test this hypothesis, she will have to deal with the following variables in her experiment
In her experiment, she will have to deal with the following elements Amount of metal corrosion⇒ Airborne Salt Concentration⇒ Air Temperature.
What are the different types of corrosion?Uniform corrosion, pitting, crevice corrosion, filiform corrosion, galvanic corrosion, environmental cracking, and fretting corrosion are just a few of the various types of corrosion that may be seen with the unaided eye. Let's examine how these types of corrosion develop and how carbon steel can be harmed by them.
What causes corrosion?When a metal reacts with something else, such oxygen, hydrogen, an electrical current, or even dirt and germs, it corrodes. When metals like steel are subjected to excessive strain, which causes the substance to split, corrosion can also occur.
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The complete question is -
Select the correct answer from each drop-down menu.
Madison lives near the ocean. She's formed a hypothesis that increased concentrations of salt in the air speeds the corrosion of certain metals. If Madison plans to test this hypothesis, she will have to deal with the following variables in her experiment:
Dependent variable: [AIR HUMIDITY/AIR TEMPERATURE/AMOUNT OF METAL CORROSION]
Independent variable: [AIRBORNE SALT CONCENTRATIONS/VOLUME OF OCEAN WATER/OCEAN WATER TEMPERATURE]
One possible confounding variable: [AIR TEMPERATURE/AIRBORNE SALT CONCENTRATIONS/COLOR OR NEARBY OCEAN WATERS]
Ibuprofen can be found in 800 mg doses in over-the-counter analgesics, such as Advil and Motrin. How many grams of iburofen
does such a tablet contain?
800 mg =
g
The grams of iburofen does such a tablet contain 800 mg = 0.8g Ibuprofen
1 g = 10^-3g = .001g
Ibuprofen has 800 mg doses in over-the-counter analgesic
800g = 800 × .001
= 0.8g
Ibuprofen is Nondteriodal Anti-inflammatory Drug (NSAID)Ibuprofen's Mechanism of Action is Decreases inflammation, pain, and fever through inhibition of cyclooxygenase activity and prostaglandin synthesisnonsteroidal anti-inflammatory medication (NSAID) used for pain relief and to reduce fever by stops inflammation and by blocking formation of cyclo-oxygenase (COX-2) a chemical mediator of inflammatory chemicals. i.e prostaglandinsIt comes under the Class analgesic (reduce pain) and antipyretic (FIRE - reduce fever)e side effects of ibuprofen NSAID are peripheral edema, fluid retention with edema, tinnitus, purpura, petechiae, anorexia, diarrhea, rash, nausea, vomiting, fatigue, dizziness, lightheadedness, anxiety, confusionTo know more about analgesic visit :
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An infant acetaminophen suspension contains 80.0mg/0.80 mL suspension. The recommended dose is 15 mg/kg body weight. (1.000 lb. is equivalent to 453.59 g; this is a measured equality.)
How many mL of this suspension should be given to an infant weighing 17 lb ? (Assume two significant figures.)
Express your answer using two significant figures.
The amount, in mL, of the suspension that should be given to an infant weighing 17 lb will be 1.16 mL
Dimensional analysis0.8 mL of the liquid contains 80.0 mg of the drug.
The recommended dose is 15 mg per kg of body weight
The infant to be given the drug weighs 17 lb.
First, let's convert the weight of the infant to kg.
1 lb = 453.59 g
17 lb = 453.59 x 17/1
= 7711.03 g
1000 g = 1 kg
7711.03 g = 7711.03 x 1/1000
= 7.711 kg
So, the baby's weight is 7.711 kg.
The drug dose for the baby can thus be calculated as:
15 mg x 7.711 = 115.67 mg
But 0.8 mL of the drug contains only 80.0 mg. How many mL will contain 115.67 mg?
0.8 x 115.67/ 80.0 = 1.16 mL
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the kind of light coming from a substance
3. Give two reasons why there are different values for the weighted average atomic mass of Candium
in the class.
The majority of elements are found in mixtures of two or more isotopes in nature. Every element's isotope has a set mass and a natural percent abundance. These isotopes' masses in their respective abundances must be reflected in the element's mass.
Every isotope contributes to the average atomic mass of an element, which is displayed in the element's box on most periodic tables (at least, the isotopes that exist naturally). However, the average is a weighted average.A weighted average mass is an average that considers the frequency of each mass in the sample.Atoms with the same atomic number that have varied masses because of differing neutron counts are known as isotopes. The weighted average of an element's isotopes' masses determines its atomic mass. Each isotope's mass and relative abundance as they exist in nature are considered in the weighted average.These are the reasons for different values of weighted average atomic mass.
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How does she/Judy Hopps discover Nick Wolf’s true intentions/con in the movie Zootopia?
Answer:
I think it was when she caught him talking to his "child"
How many GRAMS of aluminum sulfate can be made from 1.18 grams of aluminum
Answer:
Do a quick conversion: 1 moles Aluminium Sulfate = 342.150876 gram using the molecular weight calculator and the molar mass of Al2(SO4)3.
Explanation:
When methane is burned with oxygen the products are carbon dioxide and water. If you produce
14 grams of water and 16 grams of carbon dioxide from 8 grams of methane, how many grams of
oxygen were needed for the reaction?
How many miles can you drive, if your car gets 20.30 miles per gallon
and you have 12.00 gallons of gas?
Answer:
243.60 miles
Explanation:
Multiply miles per gallon times number of gallons. Both starting numbers are given to two decimal places so our answer is as well.
if the statue has a volume of 4.9m^3 and the density of marble is 2.76g/cm^3 what is the mass of the statue
If the statue has a volume of 4.9m^3 and the density of marble is 2.76g/cm^3 then, the mass of the statue is 0.563 kg.
Equation :ρ = m / V
where,
ρ = density
m = mass
V = volume
As given in the equation,
ρ is 2.76g / cm³
V is 4.9m³
So by using the formula,
ρ = m / V
we have,
2.76g / cm³ = m / 4.9m³
m = 2.76 / 4.9
m = 0.563 kg
Volume :Volume is a measurement of the amount of three-dimensional space that is occupied. It is frequently numerical quantified using SI-derived units or various imperial units. The definition of length is linked to the definition of volume. In contrast, the mass and density formula is rho = m / V.
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What are FIVE investigation techniques Judy Hopps and Nick Wilde use to crack the case in the movie Zootopia?
Answer:
1 - Crime Scene Analysis
2 - Conducting Interviews
3 - Surveillance
4 - Interrogation
5 - Developing Other Sources of Information
Explanation:
1 - Judy and Nick investigate the limousine where the attack occurred, discovering polar bear fur.
2 - Judy and Nick interview the elephant Yoga Instructor (really the Yak) at the Mystic Spring Oasis.
3 - Judy and Nick watch Zootopia Traffic Network surveillance in the Assistant Mayor's Office to discover where the "Night Howlers" were going.
4 - Judy interrogates the weasel who stole the onions earlier in the movie with the help of Mr. Big threatening to ice him.
5 - Judy uses leverage to force Nick Wilde to help in the investigation. Nick provides another source of information with his connection to his friend Flash at the Department of Mammal Vehicles who runs their plate number.
*These Investigation Techniques are defined in the study "CRIMINAL INVESTIGATION TECHNIQUES" listed on the U.S. Department of Justice Office of Justice Programs website*
a 24.37mol of gas occupied 5.32ml vessel. what mole of the gas should be removed to get a volume of 2.56ml?
Mole of the gas should be removed to get a volume of 2.56ml is 10.26 mol.
Equation :Given data,
Volume₁ = 5.32ml
number of moles at 5.32ml n₁ = 24.37mol
Molarity = ?
Volume₂ = 2.56ml
number of moles = ?
First to find molarity of gas using formula,
M = nV
where,
M is molarity
n is numbers of mole
V is volume
So, putting the values of volume₁,
M = 24.37mol x 5.32ml
M = 129.65 mol/ml
So again to get moles of second volume in same formula we have,
M = nV
So,
n = M / V
n₂ = 129.65 / 2.56ml
n = 50.64mol
So,
n₂ - n₁ = 50.64mol - 24.37mol
n = 26.27
So,
mole of the gas removed = 26.27 / 2.56
mole of the gas removed = 10.26mol
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Which of the following statements is a hypothesis?
A Why do I see more rats at a smoker's house than
a non-smoker's house
B I think that cigarette smoke increases the
appetite of rats
C
I will place three rats in three separate cages and
expose them to varying amounts of cigarette smoke
D The rat which exposed to the most smoke, ate a
larger amount of cheese compared to the other rats
Correct hypothesis is 'i will place three rats in three separate cages and
expose them to varying amounts of cigarette smoke'
Here given statement C is correct in hypothesis because when we place three rats in three separate cages and expose them to varying amounts of cigarette smoke then 50% rat are kill because nicotine concentration in the mainstream smoke particulate matter of reference cigarettes are 70%-8% and it take 20 min to kill the rats
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