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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If a container has 3 moles of a compound in 6 liters of solution, what is the concentration?2.000 M0.500 M1.000 M1.500 M
Molarity or molar concentration is a measure of the concentration of a chemical species, of a solute in a solution, using as units, number of moles, and volume in liters. The formula for Molarity is:
M = n/V
Where:
n = number of moles, 3 moles
V = volume in Liters, 6 Liters
Now adding these values into the formula:
M = 3/6
M = 0.500 M is the molarity or molar concentration, 2nd option
What are possible indicators that a chemical reaction has occurred?
Someone help me 1-10 correct answer only I give Brainly
The following substances are classified as
1. Chicken Noodle Soup is heterogeneous mixture. 2. Salt (NaCl) is Pure Substance. 3. Concrete is a heterogeneous mixture. 4. Vegetable Oil is homogeneous mixture. 5. Air is Homogeneous mixture. 6. Paint is Heterogeneous mixture. 7. Sea water is Homogeneous mixture. 8. Alcohol is Pure Substance. 9. Steel is Homogeneous mixture. 10. Sugar is Homogeneous mixture.
What is Pure Substance ?Pure substance are defined as the substance which has a constant or fixed chemical composition throughout.
What is Homogeneous mixture?Homogeneous mixture is defined as the mixture in which the components are mixed up with the same appearance and uniformly throughout the mixture.
What is Heterogeneous mixture?Heterogeneous mixture is defined as the mixture in which the composition is not uniform throughout the mixture.
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Which statement defines dynamic equilibrium? A state of balance in which the rates of the forward and reverse reactions are equal. A state of balance in which the forward reaction stops but reverse reaction continues. A state of balance in which the forward reaction continues but reverse reaction stops. A state of balance in which the forward and reverse reactions stop.
Answer:
A state of balance in which the rates of the forward and reverse reactions are equal.
Explanation:
The dynamic equilibrium is a state of balance in which the rates of the forward and reverse reactions are equal, like we can see in the following drawing:
And the concentration of the reactants and products become stable in time.
Answer: A state of balance in which the rates of the forward and reverse reactions are equal.
Explanation:
chemical equilibrium is the state in which both the reactants and products are present in concentrations which have no further tendency to change with time.
What nucleus emits an alpha particle and forms Th-234?
Uranium-238
Explanations:The process by which an atomic nucleus looses energy by radiation is known as radioactivity.
An alpha particle, have an atomic number of 2 and a mass number of 4 as shown;
[tex]_2^4He[/tex]When this is combined with Th-234, it forms Uranium-238. This shows that the uranium nucleus emits alpha particle to form Th-234 according to the chemical equation below;
[tex]_{92}^{238}U\rightarrow_2^4He+_{90}^{234}Th[/tex]How many liters of solution would need to be used to make a 1.5 M solution of HCI if we had 45g of HCI?
Explanation:
We have to find the volume of a 1.5 M solution of HCl that we can make with 45 g of HCl.
The molarity of a solution is defined like this:
Molarity = moles of solute/(volume of solution in L)
We already know the molar concentration and the volume is our unknown.
volume = ?
molarity = 1.5 M
The solute of our solution is going to be HCl and we can convert the grams of it into moles using its molar mass.
molar mass of H = 1.01 g/mol
molar mass of Cl = 35.45 g/mol
molar mass of HCl = 1 * 1.01 g/mol + 1 * 35.45 g/mol
molar mass of HCl = 36.46 g/mol
moles of HCl = 45 g * 1 mol/(36.46 g)
moles of HCl = 1.23 mol
Finally we can replace these values in the molarity formula and solve it for the volume to get the answer to our problem.
Molarity = moles of HCl/(volume of solution)
volume of solution = moles of HCl/(molarity)
volume of solution = 1.23 moles/(1.5 M)
volume of solution = 0.82 L
Answer: We will need to use 0.82 L.
Multiple choice
_______ is mechanical breakdown of food while _________breakdown occurs in the intestines.
A:chewing and chemical
B:chemical and mechanical
C:mouth and gut
Answer: A: Chewing and chemical
Explanation:
Chewing is mechanical being that chemicals are not breaking down anything your teeth are.
If a new McDonalds opens up in town, then the supply curve for cheeseburgers will shift to
to the left
to the right
upward
downward
Fill in the table to show your work." Write the entire given: you do not need to include the substance/formula. Round all numbers to thehundredths.Use the following units: "mol", "molecules", "atoms" and "g" for grams and "L" for liters.If you need to write an exponent use the "*" (ex: 6.02 x 10^23).What is the mass of 6.30 moles of Ca(OH)2?
The question requires us to calculate the mass of 6.30 moles of Ca(OH)2.
To calculate the mass of the given number of moles of Ca(OH)2, first we need to calculate the molar mass of this compound and then multiply it by the number of moles given.
- Calculating the molar mass:
We calculate the molar mass from the atomic mass of the elements Ca, O and H (the elements present in the molecule) and considering the number of atoms of this elements.
The atomic masses are:
atomic mass (Ca) = 40.08 u
atomic mass (O) = 15.99 u
atomic mass (H) = 1.01 u
There is 1 atom of Ca, 2 atoms of O and 2 atoms of H in the molecule. Thus, we calculate the molar mass of Ca(OH)2 as:
molar mass Ca(OH)2 = (1 * 40.08) + (2 *15.99) + (2 * 1.01) = 74.08 g/mol
- Calculating the mass of 6.30 moles of Ca(OH)2:
Now that we have the molar mass of Ca(OH)2, we can use it to calculate the mass of the given number of moles of this compound. To do that, we'll use the following equation:
[tex]n=\frac{m}{M}\to m=n\times M[/tex]where n is the number of moles, m is the mass and M is the molar mass.
The calculation we need to do, with units, is as it follows:
[tex]6.30\text{ mol}\times\frac{74.08g}{1\text{mol}}=466.7\text{ g}[/tex]Therefore, the mass of 6.30 moles of Ca(OH)2 is 466.7 g.
CO is a colorless, tasteless gas and a by product of incomplete combustion. Calculate the pressure in atm, occupied by this gas, at 42.5L, 65 degrees Celsius, 1.52 moles. Please include equation used, variable you solved for and answer with the correct units
Answer:
[tex]P\text{ = 0.992 atm}[/tex]Explanation:
Here, we want to get the pressure occupied by the gas under the given conditions
We can use the ideal gas equation here
Mathematically, we have this as:
[tex]PV\text{ = nRT}[/tex]P is the pressure which we want to calculate
V is the volume occupied by the gas given as 42.5 L
n is the number of moles, given as 1.52 moles
R is the molar gas constant which is :
[tex]R\text{ = }0.082057LatmK^{-1}mol^{-1}[/tex]T is the temperature which we have to convert to absolute temperature scale (Kelvin) by adding 273.15 K to the Celsius temperature
[tex]273.15\text{ + 65 = 338.15 K}[/tex]Let us rewrite the equation in terms of the Pressure, which we want to calculate
We have this as:
[tex]P\text{ = }\frac{nRT}{V}[/tex]Finally, we proceed to substitute the values given above:
[tex]\begin{gathered} P\text{ = }\frac{1.52\text{ }\times0.082057\times338.15}{42.5} \\ \\ P\text{ = 0.992 atm} \end{gathered}[/tex]Question 18 of 25Which are the correct descriptions of the phase changes?Check all that apply.O A. Vaporization is a change from gas to liquid.B. Sublimation is a change from solid to gas.C. Boiling is a change from liquid to gas.aD. Condensation is a change from liquid to gas.
Answer
Explanation
A is wrong because vaporization, conversion of a substance from the liquid to gas, not the other way round.
B is correct because sublimation is the transition from the solid phase to the gas phase without passing through an intermediate liquid phase.
C is correct because boiling is the process by which a liquid turns into a vapor/gas when it is heated to its boiling point.
D is correct because condensation is the change from a vapor to a condensed state
A mixture of He, N2, and Ar has a pressure of 21.0 atm at 28.0 °C. If the partial pressure of He is 2427 torr and that of Ar is 1787 mm Hg, what is the partial pressure of N2?
N2=
The partial pressure of N₂ in the mixture containing He, Ar with a total pressure of 21 atm is 11,746 torr.
It is given that the mixture contains He with a partial pressure of 2427 torrs, Ar with 1787torres (1mmHg = 1 torr) and the total partial pressure is given by 21 atm (1atm = 760torr) which is 15960 torr.
To find the partial pressure of N₂, by using Dalton's atomic theory,
P total = Partial pressure of Ar + Partial pressure of He + Partial pressure of N₂
15960 = 1787 + 2427 + Partial pressure of N₂
Partial pressure of N₂ = 15960 - 4214
Partial pressure of N₂ = 11,746 torr
Therefore, the partial pressure of N₂ is 11,746 torr.
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Phenyl magnesium bromide is used as a Grignard in organic synthesis. determine it’s empirical formula and molecular formula of this compound ? the molar mass of the compound is 181.33g/mol and it contains 39.7458%g/mol C, 2.77956% H, 13.4050% Mg and 44.0697% Br
For this question we will find the empirical formula and the molecular formula for a compound made of 39.7458% of C, 2.77956% of H, 13.4050% of Mg, and 44.0697% of Br. The mass we are calculating will be 181.33g/mol. The first thing we need to do is to find out how many grams of each element we actually have:
181.33g/mol = 100%
x grams = 39.7458%
x = 72.07 grams of C
181.33 = 100%
x grams = 2.77956%
x = 5.04 grams of H
181.33 = 100%
x grams = 13.4050%
x = 24.307 grams of Mg
181.33 = 100%
x grams = 44.0697%
x = 79.91 grams of Br
Now we have the mass for each element, we need to find the number of moles that each element has based on their masses and the molar mass of each one:
Carbon = 12g/mol
H = 1g/mol
Mg = 24.305g/mol
Br = 79.9g/mol
For Carbon:
12g = 1 mol
72.07g = x moles
x = 6 moles of C
For Hydrogen:
1g = 1 mol
5.04g = x moles
x = 5 moles of H
For Magnesium:
24.305g = 1 mol
24.307g = x moles
x = 1 mol of Mg
For Bromide:
79.90g = 1 mol
79.91g = x moles
x = 1 mol of Br
The molecular formula for this compound will be C6H5MgBr, this is Phenylmagnesium bromide, this will also be its empirical formula, since there is no way we can divide the numbers and make an empirical formula.
How many grams of silver/IN dichromate are neiled)when 353 p of Tin 1 hydrogen carbonate is complailyused up in a double displacement reaction? Use the following balanced equation:1 Sn(HCO3)2 + 1 Ag›Cr207 ---> 1 SnCr207 + 2 AgHCO3
Answer:
[tex]63.63\text{ g}[/tex]Explanation:
Here, we want to get the mass of silver(I) dichromate needed
Firstly, we need to get the number of moles of Tin(I) Hydrogen Carbonate used up
To get this, we have to divide the mass used up, by the molar mass
The molar mass of Tin(I) Hydrogen Carbonate is 241 g/mol
Mathematically:
[tex]Number\text{ of moles = }\frac{mass}{molar\text{ mass}}[/tex]We have the number of moles as:
[tex]Number\text{ of moles = }\frac{35.5}{241}\text{ = 0.1473 mole}[/tex]From the equation of reaction, 1 mole of Tin hydrogen carbonate used 1 mole of silver dichromate
That means 0.1473 mole of the carbonate will also use 0.1473 mole of the dichromate
Now, to get the mass of the dichromate, we have to multiply the number of moles by the molar mass of the dichromate
The molar mass of the dichromate is 432 g/mol
Thus, we have the mass used up as:
[tex]0.1473\text{ }\times\text{ 432 = 63.6 g}[/tex]It was shown that 150 J was required to raise the temperature of 20.0 g of an unknown metal from 30°C to 50°C. Using a table of specific heat
capacities, identify the unknown metal.
Answer:
0.375 J/g°C
Brass
Explanation:
To identify the unknown metal, you first need to calculate the specific heat capacity using the following equation:
Q = mcΔT
In this equation,
-----> Q = heat energy (J)
-----> m = mass (g)
-----> c = specific heat capacity (J/g°C)
-----> ΔT = change in temperature (°C)
You can find the specific heat capacity by plugging the given values into the equation and simplifying to find "c".
Q = 150 J c = ? J/g°C
m = 20.0 g ΔT = 50°C - 30°C = 20°C
Q = mcΔT <----- Given equation
150 J = (20.0 g)c(20°C) <----- Insert values
150 J = (400 g°C)c <----- Multiply 20.0 g and 20°C
0.375 J/g°C = c <----- Divide both sides by 400 g°C
The specific heat capacity of the unknown metal is 0.375 J/g°C. According to my research, there is no metal with this exact specific heat capacity. However, the closest I could find was brass (0.377 J/g°C).
What method should you use to separate this sample of a mixture?
A mixture of water-soluble solid with a solid that is not water-soluble having particles with a
diameter greater than 1000 nm.
Mix the mixture with water, filter off the insoluble solids and evaporate the water to separate the soluble solids.
This gives a heterogeneous mixture, one with dissolved solids and one with undissolved solids, you can see two different phases
These two A simple filtration method can be used to separate the two phases.
Filtering the mixture yields a solution containing soluble solids, leaving the insoluble solids on the filter paper.
This will separate the two solids.
Water can be heated and evaporated to regenerate dissolved solids. This will return the original soluble solids.
So the only option consistent with this method is to "mix the mixture with water, filter off the insoluble solids, then evaporate the water to separate the soluble solids".
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What is the temperature (in K) of a sample of helium with an root-
mean-square velocity of 450.0 m/s? The universal gas constant,
R=8.3145 J/mol.K.
Temperature of the sample helium with an root-mean-square velocity of 450.0 m/s is 32.47K
What is root mean square (rms) velocity?The value of the square root of the sum of the squares of the stacking velocity values divided by the number of values is the root-mean square (rms) velocity.
As we know, from Maxwell's speed distribution, the rms speed of velocity of gas is given by,
[tex]V_{rms}[/tex] = [tex]\sqrt{3RT/M}[/tex]
450 = [tex]\sqrt{(3*8.3145*T)/4*10^{-3} }[/tex] [ Mass of helium = 4.00 u]
T = 32.47 K
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Which of the following is an expression of Avogadro's law (k = constant)?
A. V = n
B. V = k/n
C. nV = k
D. V = kn
V=kn is an expression of Avogadro's law where temperature and pressure are constant.
What is Avogadro's law?Avogadro's law is a gas law which states that the total number of atoms or molecules has a direct proportion to the volume occupied by a gas at a constant temperature and pressure.
It is closely related to ideal gas equation as it links temperature, pressure, volume and the amount of substance.It is given as, V∝n,
The straight line graph of volume versus moles is a straight line passing through the origin which implies that zero moles of gas occupy zero volume.The empirical relation of Avogadro's law is derived from the kinetic theory of gases by taking into consideration the assumptions of an ideal gas.
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Pls help it’s due by Friday and I don’t understand the question
The average atomic mass of an element is calculated by multiplying the masses of all of its isotopes by the element's natural abundance (the decimal associated with percent of atoms of that element that are of a given isotope)
How does the average atomic mass of an element change depending on the percent abundance of its isotopes?Explanation: The Periodic Table's referenced atomic mass is the WEIGHTED average of each isotopic mass. The more that isotope contributes to the isotopic mass, the larger its isotopic percentage. Because of this, non-integral masses make up the majority of the masses stated on the Table.
How can you calculate atomic mass using isotope abundance and natural mass?Divide each percentage of abundance into decimal form Multiply this number by the isotope's atomic mass, which is 100. To get the average atomic mass for each isotope, add everything up.
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A plane takes off and is flying forward with 20,000 N of applied force, and experiences 10,000 N of air resistance. It has 20,000 N of gravitational force and 20,000 N of lift (upward) force. Show how the forces affect the plane and is it balanced or unbalanced.
The forces affecting the plane are unbalanced. There is a net force in the forwarding direction.
A force is an influence that can exchange the movement of an object. Pressure can cause an item with mass to exchange its velocity, i.e., to accelerate. the force also can be described intuitively as a push or a pull. A pressure has each importance and direction, making it a vector quantity.
The internet force is the vector sum of forces appearing on a particle or object. The internet force is a single force that replaces the impact of the unique forces on the particle's movement.
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A chemist combusts a 5.679 g sample of C5H12 and obtains 10.42 g of CO2. The molar mass of C5H12 is 72.15 g/mol, and the molar mass of CO2 is 44.01 g/mol. What are the theoretical yield, actual yield, and percent yield of CO2? Show your work and round to the correct number of significant figures.
The balanced equation is: C5H12(l) + 8O2(g) --> 5CO2 + 6H2O(l)
The theoretical yield is 0.0395 moles of carbon dioxide while the percent yield is 608%
What is the theoretical yield?
We know that we can be able to obtain the theoretical yield of the reaction from the equation of the reaction and by the use of stoichiometry. We need to know the limiting reactant.
Number of moles of pentane = 5.679 g/72 g/mol = 0.0079 moles
Number of moles of CO2 = 10.42 g/44.01 g/mol = 0.24 moles
If 1 mole of pentane yields 5 moles of CO2
0.0079 moles of pentane yields 0.0079 moles * 5 moles/1 mole
=0.0395 moles or 1.738 g
Hence the percent yield of the CO2 is;
0.24 moles/0.0395 moles * 100/1
= 608%
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Fill in the blanks
Mitosis
________________ basic phases
1. ______________
2. ______________
3. ______________
4. ______________
Occurs in a strict sequential order called the ________________
Produces ___________ cells (2) - same genetic makeup as parent cell
Answer:
Mitosis has four basic phases.
1. prophase
2.metaphase
3.anaphase
4.telephase
Occurs in a strict sequential order called the cell cycle
Produces two identical daughter cells (2) same genetic makeup as the parent cell.
Explanation:
:)
describe gravity to a 3rd grader
Answer:
you know how when you jump, you don't go flying away, that's because of a thing called gravity, it keeps everyone from floating into the sky.
Answer: if you were jumping on the bed you don’t just fly off right?! That’s crazy! Gravity keeps us from falling of the earth!
Explanation:
I need help with the last two questions pls my chemistry teacher not good
Answer:I need help with the last two questions pls my chemistry teacher not good
Explanation:
I need help with the last two questions pls my chemistry teacher not good
What is the molarity of a solution composed of 106 g Na Cozin 6.00 L ofsolution?
To solve this problem, we're going to use the formula of molarity:
[tex]\text{Molarity (M)=}\frac{mole\text{s of solute}}{liter\text{s of solution}}\text{.}[/tex]We have to find the number of moles in 106 g of Na. The molar mass of Na can be found in the periodic table, which is 23 g/mol. The conversion would be:
[tex]106\text{ g Na}\cdot\frac{1\text{ mol Na}}{2\text{3 g Na}}=4.61\text{ moles Na.}[/tex]Finally, we replace the moles (4.61 moles) and the liters of solution (6.00 L) in the formula:
[tex]\text{Molarity = }\frac{4.61\text{ moles}}{6.00\text{ L}}=0.768\text{ M.}[/tex]The molarity of the solution would be 0.768 M.
Only this one question don’t need to write an entire goddam 15 sentences but just give me a correct answer
Tysm !!!
A given element must have the same number of protons as neutrons and electrons, this is not a requirement. No other element has an atom with two protons besides helium, which has two protons in every atom.
How do electrons work?An electrical force keeps electrons in their shells. An atom's protons and electrons are drawn to one another. They are both electrically charged. Electrons have a negative charge (-), while protons have a positive charge (+).
Where can you find electrons?Electrons are present outside the atom's nucleus, in contrast to protons and neutrons, which are contained inside the nucleus at its center. Negative electrons are drawn to the positive nucleus because the electric charges of opposite polarity attract one another.
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The complete question is -
Does a given element always have the same number of each particle? Why or why not? Using periodic table, give some specific examples.
Your kidneys remove this type of waste from your cells
A:carbon dioxide
B:oxygen
D:nitrogen
Answer:
D:nitrogen
Explanation:
Nitrogen is a waste product that your kidneys remove from your blood.
Hi I have a homework can you please help me.
To predict how many electrons an element can gain or lose, we can be guided by the group to which it belongs in the periodic table. Chlorine belongs to group VII of the periodic table. This means that it has 7 valence electrons.
According to the octet rule, for an atom to be stable it must have 8 electrons in its last energy level, this means that chlorine can gain one electron to comply with the octet rule.
So, the answer will be: a.1
A golden-colored cube is handed to you. The person wants you to buy it for $100, saying that is a gold nugget. You pull out your old geology text and look up gold in the mineral table, and read that its density is 19.3 g/cm3. You measure the cube and find that it is 2 cm on each side, and weighs 40g. What is its density? Is it gold? Should you buy it? Make sure you include units and provide details to support your response.
The density is 5g/cm³ and the cube is not gold and i will not buy it
Density is the mass of the object divided by its volume gives the density of the object
Here given data is
Mass = 40g
Volume of cube = 2cm
Volume = 2³
Volume = 2×2×2cm³
Volume = 8cm³
Density of cube = ?
Then formula of density is
Density = mass/volume
Density of cube = 40g/ 8cm³ = 5g/cm³
Therefore, the given gold has density = 19.3 g/cm³ and cube density is less than of gold so cube is not a gold and i will not buy it
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Which location focuses its use on a nonrenewable energy source?
Natural gas power plants focus on using non-renewable energy resources.
Found in subterranean layers of rocks and sediments. Pressure and heat worked together to transform plant and animal debris into crude oil also known as petroleum coal, and natural gas. Our energy supply comes primarily from fossil fuels, with nuclear power and renewables rounding out the whole. These sources mainly come from our nearby star the Sun. Electricity falls into its own category because it is an energy medium and not a primary source.
Non-renewable energy resources are limited because they usually take time to replenish. The advantage of these non-renewable resources is that the power plants that use them can produce more electricity on demand. A non-renewable energy resource is a coal. Non-renewable energy is an energy source that will eventually run out. Most non-renewable energy sources are fossil fuels such as coal gas, and oil.
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Answer:natural gas powerplant
Explanation: because
