Based on the atomic structure of the given elements, the atoms in each pair having the larger atomic radii are as follows:
CsKLiPbWhat is the atomic radius of an atom?The atomic radius of an atom is the radius of the atom of an element.
It is measured as half the distance between the nucleus of two covalently bonded atoms of the element.
The atomic radius of an atom increases with an increase in electron shells or orbital but decreases with an increase in atomic number in atoms with the same number of electron shells.
Comparing the atomic radii of the given elements:
1. Li or Cs - Cs has the larger atomic radii because of greater atomic orbitals
2. K or Br - K has a greater atomic radius because it has a smaller atomic number with the same number of orbitals as Br.
3. Li or Fluorine - Li has a greater atomic radius because it has a smaller atomic number with the same number of orbitals as Fluorine.
4. C or Pb - Pb has the larger atomic radii because of greater atomic orbitals
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H. Determine which of the following electron configurations are not valid: State which
rule has been violated.
16)
17)
1s 2s 2p 3s 3p 4s²4d0 4p³
1s 2s 2p 3s³3d³
18) [Ra] 7s²5f
19) [Kr] 5s 4d05p³
20) (Xe
19) [Kr] 5s 4d05p³ is the electron configuration that is not valid and in which the configuration rule has been violated amongst all the options
What is Electronic Configuration?In both the cases of atomic physics and quantum chemistry, this term electron configuration talks about the distribution of electrons of an atom or molecule in any atomic or molecular orbitals.
What is the formula for electron configuration?The formula for it is [tex]2n^2[/tex], where n is the shell number. The tables below list the shells, n values, and the total number of electrons that can fit.
What is the electron rule of 2 8 8?More than eight electrons can fit into the shell one inside the outermost shell in transition metals. Consider argon (Ar).
Its 18 electrons are arranged in a 2-8-8 pattern. Scandium (Sc) contains 21 electrons and is only 3 places away, however its configuration is 2-8-9-2.
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Based on what you know about matter, select the statement
which is true.
A. All matter has mass, but does not
always take up space.
B. Everything around us is made up of
atoms.
C. Only solid matter takes up space.
Atoms are too small to have mass.
B
Matter is anything that can be touched physically. Everything in the universe (except energy) is made of matter, and, so, everything in the universe is made of atoms. An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons, and electrons.
Sally is swimming 6 meters every 2 seconds. this increase in speed took 10 seconds. what is the acceleration during this second part of the race?
The acceleration for the second part of the race is 0.3m/s².
How to calculate acceleration?Acceleration is the amount by which a speed or velocity increases. The acceleration can be calculated by dividing the speed of the object by the time taken as follows:
Acceleration = speed/time
According to this question, Sally is swimming 6 meters every 2 seconds, however, this increase in speed took 10 seconds.
The speed Sally is swimming is 3m/s i.e. 6/2. Hence, the acceleration can be calculated as follows:
Acceleration = 3m/s ÷ 10s
Acceleration = 0.3m/s²
Therefore, 0.3m/s² is the acceleration for the second part of the race.
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In a ______ reaction, an atom replaces or switches with another atom or part of a compound
but mainly the Moon because the Moon is..
1. closer
2. larger
3. denser
two high tides and two low tides make...time period
1. 12-hour
2. 16-hour
3. 24-hour
Moon creates...on two opposite sides
1. tidal bulges
2. moon phases
3. orbits
Moon and sun are oriented...which gravitationally pulls water
1. in a straight line
2. at a right angle measuring 90 degrees
3. at an acute angle measuring 23 angles
1. closer
2. 24-hour
3. tidal bulges
4. at a right angle
Explanation:
Not sure bout the last one but hope it helps
It is 21,000 kilometers around the earth and the earth rotates in 24 hrs. How fast is it rotating
It is 21,000 kilometers around the earth and the earth rotates in 24 hr then 875 km/hrs fast is it rotating
Earth spins on its axis and earth takes one day one rotation on its axis
It is 21,000 kilometers around the earth rotates in 24 hrs and we have to find how many km/hr earth rotating = ?
So, distance = 21,000km
Time = 24 hrs
Speed = 21,000km/24 hrs
= 875 km/hrs
875 km/hrs fast is it rotating
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What types of atoms and bonds are in the molecule shown below?
H₁
H
H
C=C
C-H
\H
Н
H
OA. Carbon, hydrogen, oxygen, and only single bonds
OB. Carbon, hydrogen, and only double bonds
C. Carbon, and only single bonds
OD. Carbon, hydrogen, single bonds, and double bonds
functional group: an atom, or group of atoms (with specific connectivity), exhibiting ... contain only carbon-carbon and carbon-hydrogen single bonds.
What do you call a molecule with only H and C atoms?Organic Molecules: The study of the characteristics of carbon-based compounds is known as organic chemistry. Except for a few inorganic carbon molecules, all carbon compounds are organic. The carbon oxides, metal ion bicarbonates and carbonates, metal cyanides, and a few more substances are examples of inorganic carbon compounds.
Hydrocarbons:Only carbon and hydrogen atoms make up the simplest organic molecules. Hydrocarbons are pure carbon and hydrogen compounds.
Alkanes: Methane, or CH4, is the most basic hydrocarbon. This is the most basic hydrocarbon in a group. The carbon atom count in each subsequent member of the series is one more than in the one before it. Alkanes are this group of chemicals (CnH2n+2). The less dense ones are utilised as fuels and are gases. the centre ones
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Which type of reaction is Mg + 2NaF --> MgF2 + 2Na?
Combination
Single Replacement
Double Replacement
Decomposition
Combustion
The reaction Mg + 2 NaF --> MgF₂ + 2Na is a single replacement reaction; option B.
What is a chemical reaction?A chemial reaction is a srecation in which atoms of elements under chemical changes to form new products.
The various types of chemical reactions include:
CombinationSingle ReplacementDouble ReplacementDecompositionCombustionA single replacement reaction is a reaction in which a single atom or a radical replaces another atom or radical in a compouds.
For example, the reaction given below is a single replacement reaction:
Mg + 2 NaF --> MgF₂ + 2NaMg replaces N ain the compound NaF.
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suppose a hydrogen atom in the ground state absorbs a 10.7 nm photon. how much kinetic energy will the emitted electron have when it is far away from the nucleus?
Answer: cheting is not alllowed is this homework or not
Explanation:
Where are chromatids found in a cell?
Answer:
During metaphase, the cell's chromosomes align themselves in the middle of the cell through a type of cellular "tug of war." The chromosomes, which have been replicated and remain joined at a central point called the centromere, are called sister chromatids.
Add to brainliest please!
Can someone do questions, 1, 2 and 3 if possible please?
Mass of magnesium ribbon is 0.21 g.
Mass of oxygen gas reacts with magnesium is 0.11 g
Number of moles of magnesium is 0.00875
Number of moles of oxygen is 0.0068.
Ratio of moles of magnesium and oxygen = 1.2 : 1
The number of moles of a substance equals the ratio of its given mass in a chemical reaction to the mass of one mole of that substance. One mole of any substance equals Avogadro's number, that is, 6.023 × 10²³.
we know that mass of crucible and lid = 35.56 g
mass of crucible and lid and magnesium = 35.77 g
Thus mass of magnesium = 35.77 - 35.56 = 0.21 g
mass of crucible and lid and magnesium oxide = 35.88 g
thus, mass of oxygen = 35.88 - 35.77 = 0.11 g
Now, Number of moles of magnesium = 0.21/24 = 0.00875
Number of moles of Oxygen = 0.11/16 = 0.0068
Ratio of Number of moles of magnesium to Number of moles of Oxygen = 0.00875/0.0068 = 1.2 : 1.
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4(NO3)2
please explain, will give brainliest!!
_____________________________________________________________________________________________________________________
1. 86 g h2 is allowed to react with 9. 70 g n2, producing 1. 24 g nh3. Part a what is the theoretical yield in grams for this reaction under the given conditions?.
1.86 g H₂ is allowed to react with 9.70 g N₂ producing 1.24 g NH₃. the theoretical yield in grams for this reaction under given conditions is 10.54 g.
The balanced chemical equation is given by :
N₂ + 3H₂ ------> 2NH₃
it is clear from the reaction that :
1 mole of N₂ react with 3 moles of H₂ to produced 2 mole of NH₃.
the molar mass of compounds are :
H₂ = 2 g/mol
N₂ = 28 g/mol
NH₃ = 17 g/mol
3moles of H₂ × 1 g/mol= 6 g
1 mole of N₂ × 28 g/mol= 28 g
2 moles of 2NH₃ × 17 g/mol = 34 g
now we have to find out the limiting reagent :
28 g of N₂ react with 6 g of H₂ , 9.70 N₂ will react with how much mass of H₂
mass of H₂ = (9.70 g of N₂ × 6 g of H₂) / 28 g of N₂
= 2.07 g
but 2.07 g H₂ is not available , only 1.86 g are available .so, H₂ is a limiting reagent.
The theoretical yield in the given case:
mass of NH₃ = (1.86 g of H₂ × 34 g of NH₃ ) / 6 g of H₂
= 10.54 g
Thus, 1.86 g H₂ is allowed to react with 9.70 g N₂ producing 1.24 g NH₃. the theoretical yield in grams for this reaction under given conditions is 10.54 g.
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Forsythia is __________, which is a type of a plant that loses its leaves each year.
A)
a savanna tree
B)
a winter tree
C)
a tropical tree
D)
perenial
E)
deciduous
Answer: The answer would be deciduous (answer E)
Explanation: A deciduous is a term which means “ Tending to fall off” or “falling off at maturity” in reference to trees and shrubs that seasonally shed leaves, usually in autumn (fall); to the shedding of petals, after flowering; and to the shedding of ripe fruit!
Answer:
Deciduous
Explanation:
The word deciduous has answer in itselfIt refers to a plant reaching its maturity of growth then tends to fall down Forsythia is such type of plant that follows deciduous manner and loses its leaves every year ,the leaves regain toouse le châtelier's principle to predict how the equilibrium for the weak base methylamine responds to the indicated changes. ch3nh2(aq) h2o(l)↽−−⇀ch3nh 3(aq) oh−(aq) δH∘rxn
In the given reaction chemical equilibrium;
adding KOH will equilibrium to the leftIncreasing the temperature will shift the equilibrium to the rightWhat is the statement of Le Chatelier's principle?Le Chatelier's principle states that for a chemical system in equilibrium if an external constraint is applied o the system, the equilibrium position will shift so as to annul the effect of the constraint applied to the system.
In practical terms, this principle implies that if the forward reaction of a system in equilibrium is endothermic and the backward reaction is exothermic, adding more heat to the system will shift the equilibrium position of the reaction to favor the forward reaction.
Considering the given chemical equilibrium, the forward reaction is endothermic and results in the formation of OH⁻ ions.
Therefore, the addition of more OH⁻ will shift the equilibrium to the left whereas, the addition of heat will shift the equilibrium to the right.
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Complete question:
Use Le Châtelier's principle to predict how the equilibrium for the weak base methylamine responds to the indicated changes.
CH₃NH₂ (aq) H₂O (l) ⇄ CH₃NH₃⁺ (aq) + OH⁻ (aq) ΔH°rxn = 103 kJ/mol
1) adding KOH
2) Increasing the temperature
List 6 characteristics that separate compounds from mixtures:
Answer:
Listed below
Explanation:
COMPOUND
1. It is a pure substance.
2. It can not be separated by a physical method.
3. Element loses their properties in a compound.
4. Its composition is fixed throughout its mass.
5. It has a fixed melting point.
6.In nature they are homogeneous.
MIXTURE
1. It is an impure substance.
2. It can be separated by a physical method.
3. Substances forming mixture retain their properties.
4. It has no fixed composition.
5. It has no sharp melting point.
6. They can be homogeneous as well as heterogeneous in nature.
Find the concentration of sulfuric acid in mol/dm3 and g/dm3 given
that 25.0 cm3 of this solution reacts with 26.5 cm3 0.100 mol/dm3
sodium hydroxide solution in a titration
H2SO4 + 2NaOH → Na2SO4 + 2H2O
The concentration of sulfuric acid in mol/dm3 and g/dm3 would be 5.194 and 0.053 respectively.
Stoichiometric problemFrom the equation of the reaction, the mole ratio of the concentrated sulfuric acid and sodium hydroxide solution is 1:2.
Recall that: mole = molarity x volume
For 26.5 cm3 0.100 mol/dm3 sodium hydroxide solution, the number of moles of the solute in the solution can be calculated as:
26.5/1000 x 0.100 = 0.00265 moles
The equivalent number of moles of the concentrated sulfuric acid will be:
0.00265/2 = 0.001325 moles
Also, recall that:
Concentration in g/dm3 = mass/volume
concentration in mol/dm3 = mole/volume
For 0.001325, 25.0 cm3 sulfuric acid:
mass = 0.001325 x 98 = 0.12985 g
Concentration in g/dm3 = 0.012985/0.025
= 5.194 g/dm3
Concentration in mole/dm3 = 0.001325/0.025
= 0.053 mol/dm3
Hence, the concentration of the sulfuric acid in mol/dm3 and g/dm3 would be 5.194 and 0.053 respectively.
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What can engineers do to lower impact forces?
O Increase the collision duration
O Decrease the velocity of an object
O Decrease the mass of an object
O All of the Above
Engineers do to lower impact forces by increasing the collision duration.
What is meant by collision?Any time two objects collide, a collision occurs. Conservation of momentum and conservation of energy are typically used to resolve collision-related problems.
Collisions can occur in two ways:
Momentum is conserved during inelastic collisions, while momentum and kinetic energy are both preserved during elastic collisions.Completely inelastic collisions, in which the impacted objects stick together, are the simplest to analyze. The conservation of momentum allows us to determine that the two objects have the same final velocity.In elastic collisions, no energy is wasted to other forms and is entirely retained as kinetic energy. It follows that momentum and kinetic energy are both preserved.
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Mass and weight
Answer only!
Weight Doesn't change with location. (will NOT change if you take an object to Mars).
weight DOES change with location. (will change if you take an object to the Moon.
Mass Is a measure of amount of Matter in an object. Is a measure of the pull of Gravity on an object.
Weight Is measured with a scale,
Mass Is measured with a triple beam balance.
Mass Is used to calculate Density.
What is triple beam balance?The triple beam balance is an instrument used to measure mass very precisely. Such devices typically have a reading error of ±0.05 grams. Its name refers to its three beams, where the middle beam is the largest, the far beam of medium size, and the front beam the smallest.
The triple beam balance is a typical instrument used to measure the mass of various objects. It consists of three beams, each of which is provided with a single sliding weight that has a size corresponding to the gradations of the notched scale on each beam..
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Which chemical leads to a pleasurable sensation when released in the brain, such as in response to nicotine?.
One of these neurotransmitters, dopamine, is released in the reward area of the brain and results in pleasurable feelings and an uplifted mood. More nicotine is required to feel good the more you smoke.
What is Nicotine ?The nightshade plant family naturally produces nicotine, an alkaloid that is widely used recreationally as a stimulant and anxiolytic. It is a medication meant to decrease withdrawal symptoms in smokers who desire to quit.
Nicotine is a highly addictive and dangerous drug. It might cause a rise in blood pressure, an increase in heart rate, and arterial constriction (vessels that carry blood). The hardening of artery walls, which may lead to a heart attack, is another potential effect of nicotine.Learn more about Nicotine here:
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The half-life of radium-226 is 1600 years. What fraction remains after 3200 years?
The leftover sample will be cut in half again.
4000 atoms⋅1/2=2000 atoms
after 3200 years
As a result, your initial sample of radium-226 will be reduced to 2000 atoms.
What is radium-226's half-life in years?Radium is created by the radioactive decay of uranium. Radiation intensity from radioactive materials reduces with time. The half-life is the time necessary for the intensity to diminish by one-half. Radium has a half-life of around 1,600 years.
Gamma radiation has the most energy of any kind of radioactive decay. Gamma radiation contains the greatest energy waves in the electromagnetic spectrum.
Radium is presently utilised to make radon, a radioactive gas that is used to cure some forms of cancer.
The historically significant transition of radium 226 into radon 222 by alpha particle emission is an example of alpha decay.
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if you gently shake a separatory funnel containing a carboxylic acid with ethyl acetate and aq nahco3, the organic acid will be found where? (multiple answers possible)
The organic compound, carboxylic acid will be found in ethyl acetate.
What are organic compounds?Organic compounds are those compounds that are obtained naturally from living matter.
Organic compounds are mostly composed of carbon, hydrogen, and oxygen.
Organic compounds are generally covalent compounds. Hence, they are usually non-polar compounds.
Based on the principle of like dissolves like, organic compounds are usually soluble in non-polar organic solvents and insoluble in polar inorganic solvents like water.
Carboxylic acid is an organic compound.
Ethyl acetate is an organic compound.
Aqueous NaHCO₃ is an inorganic compound.
Hence, carboxylic acid will dissolve in Ethyl acetate.
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If a wave has a frequency of 4.89 x 10^12 Hz, what is the wavelength?
Answer:
4,890,000,000,000
Explanation:
To convert out of scientific notation, you would take the beginning number and move the decimal to the right 12 spaces.
(keep in mind that if the twelve was negative you would move to the left 12 spaces)
Match the parts of the following chemical equation to the correct description.
CL2(g)+ALCl3(aq)-->__I2(aq)+___AlCl3(aq)
Column A. Column b
1.Cl2 + AlI3. a. Products
2.I2 + AlCl3. b. Shows which way the reaction progresses
3.(g) or (aq). c. Reactants
4.-->. d. State of Matter
PLEASE ANSWER QUICK
The parts of the chemical equation to the correct description are done below.
Column A Column B
1. Cl₂ + Ail₃ ----------- c. Reactants
2. I2 + AlCl3. ---------- a. Products
3. 3.(g) or (aq) --------- d. State of Matter
4. 4.--> -------------------- b. Shows which way the reaction progresses.
Chemical equations tell us the factors and/or compounds that can be reacting and the product(s) of the response. The coefficients on the materials in the response tell us the mole ratio or molecular ratio of the elements/compounds inside the reaction. A chemical equation is the symbolic representation of a chemical response in the form of symbols and chemical formulation.
Chemical equations are an efficient way to explain chemical reactions. This module explains the shorthand notation used to express how atoms are rearranged to make new compounds at some stage in a chemical reaction. It indicates how balanced chemical equations convey the proportions of each reactant and product concerned.
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Bobby is at a family reunion and
would like to know what the median
age is, of everyone present. Here
are the ages of everyone at his
reunion:
35, 2, 7, 33, 25, 70, 75, 40, 42, 12,
15, 7, 44, 20, 25, 3, 65, 62
What is the median?
Answer:
Median is 29.
Explanation:
add all them up and divide them
in a 1.0 l container at high temperature, 0.20 mol n2 and 0.15 mol o2 are allowed to react. set up the expression for qc. each reaction participant must be represented by one title. do not combine like terms
The concentration of NO is obtained as 3.5 * 10^-3 M.
What is the value of NO?We can see from the question that the equation of the reaction has been give. We need to recall that the equilibrium constant shows us the extent to which the reactants have been converted into products.
The more the conversion of the reactants to products, the larger the magnitude of the equilibrium constant. We can now use the values as we have them to find [NO]
If Kc = 4.10 * 10^-4
4.10 * 10^-4 = [NO]^2/[[tex]N_{2}[/tex]] [[tex]O_{2}[/tex]]
[NO] = √4.10 * 10^-4 * 0.2 * 0.15
[NO] = 3.5 * 10^-3 M
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1. 547 grams of hydrated mgso4 is heated in a crucible. After heating, 0. 7554 grams of anhydrous mgso4 remains in the crucible. How many waters of hydration were attached to the mgso4?.
7 waters of hydration were attached to the MgSO4.
1. 547 grams of hydrated mgso4 is heated in a crucible.
molecular weight of mgso4= 120 g/mol
let, x number of water molecule present in this hydrated mgso4
then, molecular weight = 18x +120.
MgSO4.X(H2O)-------> MgSO4 +X( H2O)
IF , n mole of hydrated mgso4 taken in the reactant side then , n mole of
anhydrous MgSO4 produce according to reaction.
n= 1. 547 /18x +120;
which is equal to mole of anhydrous MgSO4 that is
n= 0. 7554 /120;
by equating both equations
we get ,
0. 7554 /120 = 1. 547 /18x +120;
x= 7 (nearly.)
hence, 7 waters of hydration were attached to the MgSO4.
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A student is 159cm tall and weighs45.8kg what is the height in inches and weight in pounds ?
Height in inches is 62.6 inches and weight in pounds are 101 pounds
Height is a way to measure someone or something from base to top or head to toe
Here given data is student height = 159cm tall and weight is = 45.8kg
So we have to convert
Height in cm = height in inches
Weight in kg = weight in pounds
So, 1 inches = 2.45cm
Height = 159cm×1 inches/ 2.45cm
Height = 62.6inches
Now, 1kg = 2.2045 pounds
Weight = 45.8kg×2.2045 pounds/1kg
Weight = 101 pounds or lbs
Height = 62.6inches and weight = 101 pounds or lbs
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0.46 g of a metal produced 0.77 g of metal oxide. a. b. 0.805 g of the same metal displaced 760 cc of H₂ gas at NTP from HCI. c. 1.26 g of water was formed by the union of 1.12 g of oxygen with hydrogen. Show that these data illustrate the law of reciprocal proportions.
The given examples depict law of reciprocal proportions.
Jeremias Ritcher put forward the law of reciprocal proportions in 1792. The ratio of the masses in which they do so is either the same or a simple multiple of the mass ratio in which they combine, according to the statement, "If two different elements combine independently with the same weight of a third element."
a. Metal oxide contains
M = 0.46 g.
O = 0.77−0.46 = 0.31 g
Therefore, weight of oxygen that combines with 1g of
Metal = 0.31/0.46 = 0.674 g
b. 0.82g of Metal liberates H₂ = 0.00009 × 760 = 0.068g
Thus, the weight of H₂ that will be liberated by 1g of
Metal = 0.068/0.82 = 0.083 g
According to (a) and (b) the ratio of the weight of O:H that combine with or is displaced by the same weight of metal is 0.674:0.083 or 8:1.
Again according (c ), 1.25g of water contains
O= 1.12g and
H 1.25 − 1.11 = 0.14g
Therefore, The ratio of O:H::1.11:0.14 or 8:1
Hence, that ratio being the same, the law of reciprocal proportions is illustrated.
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A volume of 293 mL of oxygen gas was collected at a temperature of 10°C and a pressure of 102 kPa. What
volume of oxygen would be collected at STP?
Volume of oxygen would be collected at STP is 293.3 ml
V1 = 293 mL
V2 = ?
P1 = 102 kPa
P2 = 100 kPa
T1 = 10°C = ( 273 + 10 ) = 283 k
T2 = 273 k
The Combined Gas Law combines Charles Law, Boyle s Law and Gay Lussac s Law. The Combined Gas Law states that a gas pressure x volume x temperature = constant
The combined gas law is an amalgamation of the three previously known laws which are- Boyle's law PV = K, Charles law V/T = K, and Gay-Lussac's law P/T = K. Therefore, the formula of combined gas law is PV/T = K, Where P = pressure, T = temperature, V = volume, K is constant.
P1V1/T2 = P2V2/T2
102 x 293 / 283 = 100 x V2 / 273
105.6 = 0.36 x V2
105.6/0.36 = 293.3
V2 = 293.3 ml
Hence, volume of oxygen would be collected at STP is 293.3 ml
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