Elements do emit photons on those colors when electrons decay to a ground level orbit then the each element will produce its own set of color
Photon is the tiny particle of electromagnetic radiation
Light travels as discrete packets of light called photons and each photon will be carrying a certain amount of energy then the energy carried within a photon determines then what color it is with blue photons having about twice the energy as red photon and the fact are given below
Atom has the limited set of orbital path that electron are willing to travelEach elements has its own set of orbit When electron move between orbit then they release photonMotion between a certain set of orbits results in photons with a corresponding set of energiesPhoton at different energy appear at different colorEach energy will produce its own unique set of colorKnow more about color of element
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Metalloids cannot conduct an electric current
True or false
Answer: False
Explanation:
In the laboratory, a student is directed to prepare a 0.359 M solution of red #40 dye in a 250.0mL volumetric flask. The molecular mass of red #40 is 496.42 g/mol. How many grams of solid dye should the student weigh out to prepare the solution?
ANSWER
The mass of solid dye the student will use to prepare the solution is 178.15 grams
STEP-BY-STEP EXPLANATION:
What to find? The grams of the solid dye
Giving parameters
The mole of red #40 dye = 0.359 M
The molecular mass of red#40 = 496.42g/mol
The grams of the red#40 dye can be calculated by using the below formula
[tex]\begin{gathered} \text{Mole = }\frac{\text{ reacting mass}}{\text{molar mass}} \\ \text{Introducing cross multiply} \\ \text{ reacting mass = mole x molar mass} \\ \text{ Reacting mass = 0.359 x 496.24} \\ \text{ reacting mass = 178.15 grams} \\ \end{gathered}[/tex]Hence, the mass of solid dye the student will use to prepare the solution is 178.15 grams
A sample of argon gas has a volume of 735 mL at a pressure of 1.20 atm and a temperature of 112 ∘C. What is the final volume of the gas, in milliliters, when the pressure and temperature of the gas sample are changed to the following, if the amount of gas does not change?660 mmHg and 274 K.65 atm and 77 ∘C
For this question we will make use of the Combined Gas Law:
[tex]\begin{gathered} \frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2} \\ P_1:initial\text{ }pressure\text{ }(atm) \\ V_1:initial\text{ }volume\text{ }(mL) \\ T_1:initial\text{ }temperature\text{ }(K) \\ P_2:final\text{ }temperature\text{ }(atm) \\ V_2:final\text{ }volume\text{ }(mL) \\ T_2:final\text{ }temperature\text{ }(K) \end{gathered}[/tex]Answer to part A)
Given:
P2:660 mmHg
T2:
Whats A layer in a body of water in which water temperature drops with increased depth faster than it dose in other layer
The layer whose temperature drops with the depth is called Thermocline
What is thermocline?
A thermocline is a thin, distinct layer in a large body of fluid (such as water, such as in an ocean or lake; or air, such as an atmosphere), where temperature changes more dramatically with depth than it does in the layers above or below.
A thermocline layer is also called a thermal layer and there are lots of factors responsible for its temperature changes like
• seasonal weather variations,
• latitude
• local environmental conditions, like tides and currents.
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A sample of gas occupies 2.71 mL at STP.If you wanted to know the moles of the sample, you would use the __________ Gas LawGroup of answer choicesIdeal Gas LawCombined Gas LAwDalton's Law of partial pressure
Explanation:
We have a 2.71 mL at STP and we want to find the number of moles. So we know that:
V = 2.71 mL n = ? R = 0.082 atm*L/(mol*K) T = 273.15 K P = 1 atm
To find the number of moles we can use the ideal gas law and solve it for n:
P * V = n * R * T
Answer: Ideal Gas Law
If blood has a density of 1.05 g/mL, how many liters of blood are donated if 500 g of blood are given?
Answer:
0.476 L
Explanation:
To find the volume of the blood, you need to multiply the given mass (grams) by the density of blood. It is important to arrange the ratio in a way that allows for the cancellation of units (since you are going from grams to mL, grams must be in the denominator).
Density = 1.05 g/mL
500 grams 1 mL
-------------------- x --------------------- = 476 mL
1.05 grams
Finally, you need to convert mL to L. The final answer should have 3 sig figs like the given mass.
1,000 mL = 1 L
476 mL 1 L
----------------- x -------------------- = 0.476 L
1,000 mL
Given the following unbalanced equation: Na2O+H2O -> NaOHhow many moles of NaOH are produced from 1.20 moles of Na2O?
The first step we have to follow is to balance the given equation, making the number of atoms of each element equal in both sides of the equation.
[tex]Na_2O+H_2O\to2NaOH[/tex]Now, that the equation is balanced, we can use the stoichiometric ratio of Na2O to NaOH to find the number of moles of NaOH produced from 1.20moles of Na2O:
[tex]1.20molNa_2O\cdot\frac{2molNaOH}{1molNa_2O}=2.40molNaOH[/tex]2.40 moles of NaOH are produced.
According to VSEPR if there are 3 electron domains around the central atom and no lone pairs on it the molecular shape will be
A.
Triangular
B.
Tetrahedral
C.
Trigonal pyramidal
D.
Trigonal planar
Answer:
B!! I know this is right because I took this test.
c. Match each property of solids with its definition. (2 points)
A. Brittleness
B. Ductility
C. Conductivity
D. Malleability
Ability to be bent or flattened
Ability to move heat or charge
Tendency to break rather than bend
Ability to be stretched without breaking
Answer:
a: Tendency to break rather than bend
b: Ability to be stretched without breaking
c: Ability to move heat or charge
d: Ability to be bent or flattened
Which statement about air is true?
Responses
Air is made of tiny particles that move separately from one another.
Air is a form of energy, similar to light or sound.
Although air has mass and takes up space, it lacks all other properties of matter.
Air is made of particles of photons, which also form light.
The true statement about Air is that :
Air is made of tiny particles that move separately from one another.
Gas particles move quickly in all directions and regularly collide with one another and the container's side. The particles gather kinetic energy and accelerate as the temperature rises.
Any physical phenomenon where a quantity is continuously undergoing minor, random fluctuations is referred to as Brownian motion. Robert Brown, a Scottish botanist, who was the first to observe this fluctuation, was honored with its name.
Thus, the tiny particles in the air continues to move.
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Question 8Which of the following is an INCORRECT statement?-A redox reaction involves the transfer of electrons between atoms.-A single reactant is the identifying characteristic of a decomposition reaction.-Two ionic reactants is the identifying characteristic of a single replacement reaction.-The combustion of CH4 will produce CO2 as one of the products.
A single replacement reaction, is a type of reaction in which we have the following set up:
A + BC -> AC + B
As we can see, an element will react and switch places in a molecule, forming a new molecule and a lone element as products, and according to this set up, we don't have two ionic reactants as characteristic for a single replacement reaction, therefore letter C is the incorrect option.
how many formula units are in 62.2 g of aluminum sulfide
2.49 * 10^23 formula units make up a sample of aluminum sulfide that weighs 62.2 g.
Describe a mole.
A mole is 6.022 * 10^23 atoms, molecules, ions, or other particles.
The number of formula units in the 62.2 g sample of aluminum sulfide is specified in the question.
Calculating the number of moles is necessary to get the number of formula units.
Aluminum Sulfide has a molecular weight of 150.158 gm.
1 mole is made up of 150.158 g of aluminum sulfide.
62.2 g will yield 0.414 moles when multiplied by 1 / 150.158.
Formula units: 6.022 * 10^23 equals one mole.
0.414 moles = 6.022 * 10²³ *0.414
= 2.49 x 10^23 mathematical units.
A 62.2 g sample of aluminum sulfide therefore has 2.49 * 10^23 formula units.
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I need help with this question
The balanced equation is:
Cu + 2AgNO₃ -> 2Ag + Cu(NO₃)₂
The coefficients are: 1, 2, 2, 1
How to balanced equationThe balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
The equation given from the question can be balanced as follow:
Cu + AgNO₃ -> Ag + Cu(NO₃)₂
There are 2 atoms of N on the right side and 1 atom on the left. It can be balanced by writing 2 before AgNO₃ as s shown below:
Cu + 2AgNO₃ -> Ag + Cu(NO₃)₂
There are 2atoms of Ag on the left side and 1 on the right. It can be balanced by writing 2 before Ag as show below:
Cu + 2AgNO₃ -> 2Ag + Cu(NO₃)₂
Thus, the equation is balanced.
The coeficients are: 1, 2, 2, 1
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how many moles are in 1.8 x 1023 molecules
The number of moles in 1.8 x 10^23 molecules is 0.299 moles.
What is mole and how the moles are calculated out of molecules?Mole is a quantity representing the amount of substance present per litre of the solution.See we must have studied how to convert moles to molecules , and it is by multiplying the number of moles by 6.02 x 10^23.6.02 x 10^23 is the avagudro number which is universal in nature and is used in countless physical chemistry numericals.Like wise if we have to get the number of moles and the number of molecules are given then we will divide the number by avagudro number.So 1.8 x 10^23/ 6.02x10^23 = 0.299 moles are present in 1.8 x 10^23 molecules .To know more about moles visit:
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Calculate the pH of each of the following aqueous solutions. (Enter your answers to two decimal places.)
The pH of each of the following aqueous solutions is:
(a) pH = 1.00
(b) pH = 1.51
(c) pH = 7.0
(d) pH = 12.28
What is pH of a solution or medium?The pH of a medium is the negative logarithm to base 10 of the hydrogen ion concentration of the medium.
pH = - log [H⁺]
The pH of each of the following aqueous solutions is given below:
(a) 10.0 mL of 0.10 M HCI
[H⁺] = 0.1 M
pH = - log 0.1
pH = 1.00
(b) 10.0 mL of 0.10 M HCI plus 5.0 mL of 0.10 M NaOH
0.5 mmoles of H⁺ will react with 0.5 mmoles of OH⁻
moles of H⁺ remaining = 0.5 mmoles
volume of solution = 15 mL
[H⁺] = 0.5/15 = 0.033 M
pH = - log 0.033
pH = 1.51
(c) 10.0 mL of 0.10 M HCI plus 10.0 mL of 0.10 M NaOH
1.0 mmoles of H⁺ will react with 1.0 mmoles of OH⁻
moles of H⁺ remaining = 0.0 mmoles
hence the solution is neutral
pH = 7.0
(d) 10.0 mL of 0.10 M HCI plus 15.0 mL of 0.10 M NaOH
1.0 mmoles of H⁺ will react with 1.0 mmoles of OH⁻
moles of OH⁻ remaining = 0.5 mmoles
volume of solution = 25 mL
[OH⁻] = 0.5/25 = 0.02 M
pOH = - log 0.02
pOH = 1.72
pH = 14 - pOH
pH = 14 - 1.72
pH = 12.28
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Perform the following operationand express the answer inscientific notation.4.3x10² - 7.0×10² = [?]×10
Explanation:
We have to perform the following substraction:
4.3 x 10² - 7.0 × 10² = ?
Since both numbers have the same order of magnitude we can directly substract them.
4.3 - 7.0 = -2.7
So the answer to our operation is:
4.3 x 10² - 7.0 × 10² = -2.7 × 10²
Answer: -2.7 × 10²
how can I differentiate a ketone from aldehyde yet they are both carbonyls class
Answer:
- A carbonyl group has a carbonyl carbon with only O atom while A haldehyd group has acarbonyl carbon with only OH atom.
[tex].[/tex]
Answer:
- A ketone is not oxidised but aldehyde csn be so
LT.2C - COMPOUNDS - QUESTION 1Which of the following Lewis structures is invalid (because it breaksthe octet rule, or because it uses too many/too few electrons)?HHP-HI-U::IF-F:HHHa.a.b..C.d..
There are eight bonding electrons and one non-bonding pair of electrons across the Se atom. The Lewis structure is, for this reason, a legitimate Lewis structure of SeF4 S e F four can't be drawn without violating the octet policies.
Lewis structures, additionally called Lewis dot formulas, Lewis dot systems, electron dot structures, or Lewis electron dot systems, are diagrams that show the bonding among atoms of a molecule, in addition to the lone pairs of electrons that can exist within the molecule.
The Lewis structures became named after Gilbert N. Lewis, who added it in his 1916 article The Atom and the Molecule. Lewis structures extend the idea of the electron dot diagram by way of including lines between atoms to represent shared pairs in a chemical bond.
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Name AND calculate the molar mass of the following compounds:
AI(CN)3
The name of the given compound is aluminum cyanide . and the molecular mass of the compound Al(CN)3 is 104.98g .
What is aluminum cyanide ?A metallic cyanide is aluminum cyanide. Al(CN)3 is the chemical formula. By reacting aluminum metal and mercuric cyanide in liquid ammonia, aluminum cyanide was created as an ammoniate. Water breaks down aluminum cyanide to produce aluminum hydroxide.
What is molecular mass ?The mass of a given molecule is its molecular mass (m), which is expressed in daltons (Da or u). Because they contain various isotopes of an element, multiple molecules of the same substance can have distinct molecular weights. According to IUPAC, the related quantity relative molecular mass is a unitless comparison between the mass of a molecule and the unified atomic mass unit (also called the dalton). The molar mass is unrelated to, but distinct from, the molecular mass and relative molecular mass. The molar mass, which is stated in g/mol, is defined as the mass of a specific material divided by the amount of a substance. As a result, the molar mass represents the average of several molecules or particles.
Molecular mass of Al(CN)3 = 26.98 + 3×12 + 3×14 = 104.98g
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The atoms of different elements have what?
A town is questioning whether to close down a factory that may be polluting its river. Which of the following statements best describes how science can help the town
make a decision?
A Science will obtain non-bias evidence.
B Science will gather opinions from all sides.
C Science only considers favorable evidence.
D Science can make a judgment.
A town is questioning whether to close down a factory that may be polluting its river. the following statements best describes how science can help the town is Science will obtain non- bias evidence.
A science investigation is free from bias. To conduct the proper investigation we should make sure it will be free from bias. science verify with more data sources and multiple sampling check. Review findings.
Thus, A town is questioning whether to close down a factory that may be polluting its river. the following statements best describes how science can help the town is Science will obtain non- bias evidence.
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Answer: A. Science will obtain non-bias evidence
Explanation:
In the equation:N2 + 3H2 → 2NH3How many Liters of nitrogen are needed to produce 1 L of Ammonia?
answer and e explanation
0.5L of nitrogen are needed
because the mol ratio between nitrogen and ammonia is 1:2
How many water molecules are contained in a 0.50L bottle of water? Assume water has a density of 1.00 g/mL.
18.4 × 10^(24) water molecules are contained in a 0.50L bottle of water.
Given,
Density of water = 1.00 g/mL
Volume of water = 0.50L = 500 ml
We can calculate the mass of water.
As we know that,
Density = mass/ volume
By substituting the values, we get
1 = Mass / 500
Mass = 500 g.
Now, we know
Molar mass of water = 18 g
Mass of water = 500g
We will calculate the moles of water
Mole = given mass / molar mass
= 500/18 = 27.7 moles
As we know that,
1 mole = 6.673 × 10^(23) molecules
So, 27.7 moles contain = 6.673 × 27.7 × 10^(23)
= 18.4 × 10^(24) molecules
Thus, we concluded that 18.4 × 10^(24) water molecules are contained in a 0.50L bottle of water.
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Please help with all 6 questions, will give brainliest!!
Answer:
1)
Required moles = Given mass / Molar mass
Required moles = 482.3/97.9
Required moles = 4.92 moles
2)
Required mass = Moles x Molar mass
Required mass = 0.739 x 120.743
Required mass = 89.229g
3)
Required atoms = Moles x Avogadro's number
Required atoms = 1.85 x 6.02x10²³
Required atoms = 1.114x10²⁴ atoms
4)
Required moles = Molecules / Avogadro's number
Required moles = 3.9x10¹⁸ / 6.02x10²³
Required moles = 6.478x10¯⁶ moles
5)
Required molecules = Moles x Avogadro's number
Required molecules = (Given mass / Molar mass) x Avogadro's number
Required molecules = (85.46 / 23.95) x 6.02x10²³
Required molecules = 3.56 x 6.02x10²³
Required molecules = 21.4x10²³ molecules
6)
Required mass = Given molecules x Molar mass / Avogadro's number
Required mass = 4.63x10²⁴ x 80 / 6.02x10²³
Required mass = 370.4x10²⁴ / 6.02x10²³
Required mass = 615.28g
The precise mass of 85X is 84.912 amu, and 72.17% of all atoms have that mass. The precise mass of 87X is 86.909 amu, and 27.83% of all atoms have that mass. Show the calculation to determine the average atomic mass for element X. Include a label on your answer.
The average atomic mass of element X, given the data is 85.469 amu
How to determine the avaerage atomic mass
Let 85X be isotope ALet 87X be isotope BFrom the question above, the following data were obtained:
Mass of isotope A (85X) = 84.912 amuAbundance of A (A%) = 72.17%Mass of isotope B (87X) = 86.909 amuAbundance of B (B%) = 27.83%Average atomic mass =?The average atomic mass of X can be obtained as illustrated below:
Average atomic mass = [(Mass of A × A%) / 100] + [(Mass of B × B%) / 100]
Average atomic mass = [(84.912 × 72.17) / 100] + [(86.909 × 27.83) / 100]
Average atomic mass = 61.282 + 24.187
Average atomic mass = 85.469 amu
Thus, the average atomic mass is 85.469 amu
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How many moles of aluminum are needed to react completely with 2 moles FeO?
Al(s)+3FeO(s)—>3Fe(s)+Al2O3(s)
0.66 moles of aluminum are needed to react completely with 2 moles of FeO.
Given,
the chemical equation is,
Al(s)+3FeO(s)—>3Fe(s)+Al2O3(s)
1 mole of aluminum is needed to react completely with 3 moles of FeO.
then,
no of moles of aluminum are needed to react completely with 2 moles of FeO = 2/3 = 0.66 moles
Hence, 0.66 moles of aluminum are needed to react completely with 2 moles of FeO.
What is aluminum?A chemical element with the symbol Al and atomic number 13 is known as aluminium (or aluminium in American and Canadian English). Aluminum has a density that is around one third that of steel, which is lower than that of most common metals. It has a strong affinity for oxygen, and when exposed to air, creates a protective oxide coating on the surface. Aluminum visually resembles silver due to similarities in colour and light-reflecting properties. It is ductile, soft, and non-magnetic. Aluminum is the twelfth most prevalent element in the universe based on the frequency of its one stable isotope, 27Al, which is also the only stable isotope. Radiodating makes use of 26Al's radioactivity. A chemical element with the symbol Al and atomic number 18 is called aluminium (aluminium in American and Canadian English).
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I need help with my homework I need help with number 2
Here we have to multiply two values of length, so the result will be a value of surface, that means that the result will have the same unit and squared:
[tex]19.3cm\cdot21.0cm\text{ = 405.3 }cm^2[/tex]So, the correct answer is 405.3 cm^2.
2. A plane travels 65 m/s for 300 km to its destination. How long did the plane travel to reach its destination? Give your answer in minutes.
heeelp
A plane travels 65 m/s for 300 km to its destination and will take 76.923 min to reach the destination.
Given data:
Speed = 65m/s
Distance = 300 km = 300000 m
Time= ?
Speed can be calculated by using the formula:
Speed = Distance/ Time
65 = 300000/ time
Time= 300000/65
= 4615.38 s
Time taken to reach the destination = 76.923 min
Therefore, the plane will take time travel to reach the destination 76.923 min.
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Hello I need help on the question 5 for chemistry. Also- this is a worksheet for practice! Thank you!
Answer: 1.61g of H2O would be necessary to produce 1 L of O2 at STP
Explanation:
The question requires us to calculate the mass of water (H2O) that must be decomposed in order to produce 1 liter of oxygen gas (O2) at STP, considering the following chemical reaction:
[tex]H_2O_{(l)}\rightarrow H_{2(g)}+O_{2(g)}[/tex]To solve this problem, we'll need to:
1) balance the chemical equation;
2) calculate the molar mass of H2O;
3) calculate the number of moles of O2 that correspond to 1 L of this gas at STP;
4) using the balanced chemical equation, calculate the amount of moles of H2O that would be necessary to produce the required amount of O2;
5) using the molar mass of H2O, determine the mass of H2O necessary to produce 1 L of O2.
1) Balancing the chemical equation
In the given chemical equation, we can see that there are 2 O atoms on the products' side, but only 1 O atom on the reactants side. We can adjust the coefficient of H2O from 1 to 2 in order to have the same amount of O on both sides:
[tex]2H_2O_{(l)}\operatorname{\rightarrow}H_{2(g)}+O_{2(g)}[/tex]Next, we need to adjust the amount of H atoms: there are 4 H atoms on the reactants side, and only 2 H atoms on the products side, thus we can adjust the coefficient of H2 from 1 to 2. The balanced chemical equation for the decomposition of H2O to H2 and O2 can be written as:
[tex]2H_2O_{(l)}\operatorname{\rightarrow}2H_{2(g)}+O_{2(g)}[/tex]2) Calculating the molar mass of H2O
We'll need the molar mass of H2O to determine its required mass, and we can determine the molar mass from the atomic masses of H and O:
O = 15.99 amu
H = 1.008 amu
We can calculate the molar mass of H2O as:
[tex]molar\text{ mass \lparen H}_2O)=2\times1.008+1\times15.99=18.01g/mol[/tex]Therefore, the molar mass of H2O is 18.01 g/mol.
3) Calculating the number of moles of O2
Under standard temperature and pressure conditions (STP), 1 mol of any gas corresponds to 22.4 L of this gas. Knowing that 1 L of O2 must be produced, we can calculate the number of moles of O2 as:
22.4 L O2 ----------------------------- 1 mol O2
1 L O2 ----------------------------------- x
Solving for x, we'll have:
[tex]x=1L\text{ O}_2\times\frac{1mol\text{ O}_2}{22.4L\text{ O}_2}=0.0446mol=4.46\times10^{-2}mol\text{ O}_2[/tex]Therefore, 1 L of O2 corresponds to 0.00446 moles of this gas at STP.
4) Calculating the number of moles of H2O necessary
From the balanced chemical equation, we can see the 2 moles of H2O are necessary to produce 1 mol of O2, thus we can write:
1 mol O2 ------------------------ 2 mol H2O
0.0446 mol O2 --------------- y
Solving for y, we'll have:
[tex]y=0.0446mol\text{ O}_2\times\frac{2mol\text{ H}_2O}{1mol\text{ O}_2}=0.0892mol\text{ H}_2O[/tex]Therefore, 0.0892 moles of H2O would be necessary to produce 1 L of O2 at STP.
5) Calculating the mass of H2O
Now that we know the required amount of H2O, in moles, and the molar mass of H2O, we can determine the mass required of H2O using the following equation:
[tex]n=\frac{m}{MM}\rightarrow m=n\times MM[/tex]where n is the number of moles, m is the mass of the sample and MM is the molar mass of the compound.
Applying the calculated values of n and M, we'll have:
[tex]m_{H_2O}=0.0892mol\times18.01g/mol=1.61g[/tex]Therefore, 1.61g of H2O would be necessary to produce 1 L of O2 at STP.
calculate the percentage of CO2 in a mixture with the following composition: 2% SiO2, 20.94% MgCO3 and 77.06% CaCO4
The percentage of CO₂ in the given mixture is 44.87%.
What is the percentage of CO₂ in the given mixture?A mixture is a substance that is composed of two or more substances physically combined together.
The percentage of CO₂ in the given mixture is calculated as follows:
In the mixture, CO₂ is produced from the decomposition of MgCO₃ and CaCO₃ only.
Decomposition of MgCO₃ and CaCO₃ is shown below:
MgCO₃ ---> MgO + CO₂
CaCO₃ ----> CaO + CO₂
Molar mass of MgCO₃ and CaCO₃ is 84 g/mol and 100 g/mol respectively.
Molar mass of CO₂ is 44.0 g/mol
Percentage of CO₂ in MgCO₃ and CaCO₃ is 52.38% and 44.0% respectively.
Percentage of CO₂ in 20.94% MgCO₃ = 52.38 * 20.94% = 10.97%
Percentage of CO₂ in 77.06% CaCO₃ = 44.0% * 77.06% = 33.90 %
Total percentage of CO₂ = 44.87%
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