equal moles of C8H18 and O2 are reacted to give equal no. of moles of CO2.
mole ratio of C8H18 =(1/2) x 8 = 4 moles
mole ratio of O2 = (1/25) x 4 = 0.16 moles
so, limiting reagent is O2
the no. of moles of CO2 formed = 16 x 0.16 = 2.56 moles
weight of CO2 formed (theoretical weight) = 2.56 x 44 = 112.64
Percentage yield =(practical yiel/theoretical yield) x 100 = (28.16/112.64) x100 = 25%
Answer: The percent yield of carbon-dioxide gas is 25%.
Explanation:
[tex]2C_8H_{18}+25O_2\rightarrow 16CO_2+18H_2O[/tex]
1) According to reaction 25 moles of oxygen gas reacts with 2 moles of [tex]C_8H_{18}[/tex], then 4 moles of oxygen will react with [tex]\frac{2}{25}\times 4[/tex] moles of [tex]C_8H_{18}[/tex] that is 0.32 moles.
Oxygen with 4 moles is limiting reagent in this reaction.
2) According to reaction 25 moles of oxygen gas gives 16 moles of carbon-dioxide gas, then 4 moles of oxygen gas will give [tex]\frac{16}{25}\times 4[/tex] moles of carbon-dioxide gas that is 2.56 moles.
Theoretical mass of [tex]CO_2=\text{number of moles}\times \text{molecular mass of }CO_2}=2.56mol\times 44g/mol=112.64 g[/tex]
Experimental mass of [tex]CO_2[/tex] = 28.16 g
[tex]Percent yield=\frac{|\text{Experimental mass}}{\text{Theoretical mass}}=\frac{28.16\times 100}{112.64}=25\%[/tex]
Hence, the percent yield of carbon-dioxide gas is 25%.
If a feather and an iron bar is released from a same height in a room without any air resistance, which one(s) will impact the ground first.
A) neither one, because without air resistance gravity is absent
B) iron bar
C) both
D) feather
Both a feather and an iron bar will impact the ground at the same time if released from the same height in a room without air resistance, demonstrating that gravity causes all objects to fall with the same acceleration, disregarding their mass.
Explanation:If a feather and an iron bar are released from the same height in a room without any air resistance, both the feather and the iron bar will impact the ground at the same time. The correct answer is C) both. This outcome occurs because in the absence of air resistance, all objects fall at the same rate due to gravity. This phenomenon was famously demonstrated on the Moon by astronaut David R. Scott in 1971, where, despite the Moon's lower gravitational acceleration of 1.67 m/s² compared to Earth's 9.81 m/s², both a hammer and a feather were shown to fall at the same rate when dropped from the same height. This validates that acceleration due to gravity is constant and does not depend on the mass of the objects involved.
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The active ingredient in some oral anesthetics used in sore throat sprays. what is the molar mass of phenol?
The molar mass of phenol is [tex]\boxed{94.113{\text{ g/mol}}}[/tex] .
Further Explanation:
Structure of phenol:
The phenol is a white crystalline aromatic compound which contains a hydroxyl group (-OH). Phenol is generally an active ingredient of phenol spray which helps in sore throat. It is also an active ingredient of some more oral analgesics which are used medically to reduce the pain.
The structure of phenol is composed of a benzene ring where one of the hydrogens is replaced by the –OH group. Since the molecular formula of benzene is [tex]{{\text{C}}_6}{{\text{H}}_6}[/tex] , therefore, after replacing of one hydrogen atom with –OH group, the molecular formula becomes,
[tex]\begin{aligned}{\text{Molecular formula}}\left( {{\text{Phenol}}} \right)&= {\text{Benzene}}-{\text{H}}\left({{\text{one}}}\right)+{\text{OH}}\\&={{\text{C}}_{\text{6}}}{{\text{H}}_{\text{6}}} - {\text{H}}+{\text{OH}}\\&={{\text{C}}_{\text{6}}}{{\text{H}}_5}+{\text{OH}}\\&={{\text{C}}_{\text{6}}}{{\text{H}}_5}{\text{OH}}\\\end{aligned}[/tex]
Now calculate the molar mass of phenol as follows:
The formula to calculate the molar mass of phenol [tex]\left({{{\text{C}}_{\text{6}}}{{\text{H}}_{\text{5}}}{\text{OH}}}\right)[/tex] is,
[tex]{\text{Molar mass}}=\left[\begin{gathered}\left({{\text{Total number of C}}}\right)\left({{\text{Atomic mass of C}}}\right)+\hfill\\\left({{\text{Total number of H}}}\right)\left({{\text{Atomic mass of H}}}\right)+\hfill\\\left({{\text{Total number of O}}}\right)\left({{\text{Atomic mass of O}}}\right)\hfill\\\end{gathered}\right][/tex]
The atomic mass of carbon atom is 12.011 g/mol.
The atomic mass of oxygen atom is 15.999 g/mol.
The atomic mass of hydrogen atom is 1.008 g/mol.
Substitute the respective values in the above formula,
Molar mass = [(Total number of C)(Atomic mass of C) + (Total number of H)(Atomic mass of H) + (Total number of O)(Atomic mass of O)]
[tex]\begin{aligned}{\text{Molar mass}}&=\left[\begin{gathered}\left( {\text{6}}\right)\left({{\text{12}}{\text{.011 g/mol}}} \right)+\left({\text{6}} \right)\left({{\text{1}}{\text{.008 g/mol}}}\right)+\hfill\\\left({\text{1}} \right)\left({{\text{15}{\text{.999gmol}}}\right)\hfill\\\end{gathered}\right]\\&=94.113{\text{ g/mol}}\\\end{gathered}[/tex]
Therefore, the molar mass of phenol is 94.113 g/mol.
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Mole concept
Keywords: Phenol, molar mass, moles, atomic mass, structure of phenol, benzene ring, hydrogen atoms, carbon atoms, benzene ring, OH group, 94.113 g/mol.
The molar mass of phenol is 94.11 g/mol
Phenol is known mainly as chemical and a natural substance. It is said to be of no color but white solid at its pure state
It has a unique odor that is sweet and tarry and it does evaporates more slowly than water.
Phenol is known as the family of organic compounds characterized by a hydroxyl (―OH) group attached to a carbon atom.
The term phenol is the specific name for its simplest member, monohydroxybenzene (C6H5OH), called benzenol, or carbolic acid.
Conclusively, It is used in tiny quantity as a disinfectant in household cleaners, mouthwash etc.
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There are three common functional groups in organic chemistry that are readily ionized by adjusting the ph of the aqueous solution during an extraction. name and write the chemical structure of these three functional groups and show each
why is it an advantage for the graduated cylinder to be shaped with a lip at the top
A concentrated solution in water will always contain a strong or weak electrolyte true or false
what location on earth experiences the least change in the number of daylight hours throughout the year?
For each reaction, identify the precipitate or lack thereof bacl2 naoh
One radioactive isotope of calcium has an atomic mass number of 47. How many neutrons are in the calcium-47 nucleus?
Answer: The number of neutrons in the given isotope are 27.
Explanation:
Atomic number is defined as the number of electrons or number of protons that are present in a neutral atom. It is represented as Z.
Z = Atomic number = Number of electrons = Number of protons
Mass number is defined as the sum of number of protons and number of neutrons present in an atom. It is represented as A.
A = Mass number = Number of protons + Number of neutrons
Number of neutrons = Mass number - Atomic number
We are given an isotope having representation: [tex]_{20}^{47}\textrm{Ca}[/tex]
Atomic number or number of protons = 20
Mass number = 47
So, number of neutrons = 47 - 20 = 27
Hence, the number of neutrons in the given isotope are 27.
Borax (na2b4o7·10h2o; fw = 381.372 g/mol; density = 1.73 g/ml), a primary standard, was used to standardize a solution of hno3. titration of 0.2619 g of borax required 21.61 ml. what is the molarity of the hno3
Final answer:
The molarity of the HNO3 solution is calculated by first determining the number of moles of borax used in the titration, then finding the equivalent moles of HNO3 based on the reaction stoichiometry, and finally dividing the moles of HNO3 by the volume of solution used in the titration.
Explanation:
Calculating the Molarity of HNO3:
To determine the molarity of the HNO3 solution, we need to follow a series of steps that involve the titration of borax with HNO3. First, we need to calculate the number of moles of borax using its molar mass. We know that the molar mass of borax is 381.372 g/mol and that 0.2619 g of borax was used in the titration. The number of moles of borax can be calculated as:
moles borax = (0.2619 g) / (381.372 g/mol)
Once we know the moles of borax, we can use the titration reaction to find the moles of HNO3 that react with the borax. Assuming a 1:1 reaction (which is typical for a neutralization reaction), the moles of HNO3 would be equal to the moles of borax. We then divide the number of moles of HNO3 by the volume of HNO3 used (in liters) to get the molarity:
molarity of HNO3 = moles of HNO3 / volume of HNO3 (in L)
Finally, we can fill in the known values and calculate the molarity of the HNO3 solution precisely.
Perigee: :: apogee:farthest
The oceanic crust is made primarily from this type of rock.
Answer:
Igneous rock basalt.
Explanation:
The ocean crust is made mostly of igneous rock basalt, which comes from lava and the movement of tectonic plates.
How many grams of hydrogen in 4.50 mol H2SO4
What is the final pressure (expressed in atm) of a 3.05 l system initially at 724 mm hg and 298 k, that is compressed to a final volume of 2.60 l at 273 k?
[tex]\boxed{1.0237596\;{\text{atm}}}[/tex] is the final pressure of a 3.05 L system initially at 724 mm Hg ad 298 K that is compressed to a final volume of 2.60 L at 273 K.
Further Explanation:
An ideal gas is a hypothetical gas that is composed of a large number of randomly moving particles that are supposed to have perfectly elastic collisions among themselves. It is just a theoretical concept and practically no such gas exists. But gases tend to behave almost ideally at a higher temperature and lower pressure.
Ideal gas law is the equation of state for any hypothetical gas. The expression for the ideal gas equation is as follows:
[tex]\boxed{{\mathbf{PV = nRT}}}[/tex] ...... (1)
Here,
P is the pressure of the gas.
V is the volume of the gas.
T is the absolute temperature of the gas.
n is the number of moles of gas.
R is the universal gas constant.
Rearranging equation (1), we get:
[tex]\frac{{PV}}{T} = nR[/tex] ...... (2)
For a particular gas, the number of moles (n) and the universal as constant (R) both are constants.
If a specific gas with [tex]{P_1}[/tex], [tex]{V_1}[/tex] and [tex]{T_1}[/tex] is subjected to any change and the final parameters being [tex]{P_2}[/tex], [tex]{V_2}[/tex] and [tex]{T_2}[/tex]. So equation (2) becomes,
[tex]\frac{{{P_1}{V_1}}}{{{T_1}}} = \frac{{{P_2}{V_2}}}{{{T_2}}}[/tex] ...... (3)
Here,
[tex]{P_1}[/tex] is the initial pressure of the gas.
[tex]{V_1}[/tex] is the initial volume of the gas.
[tex]{T_1}[/tex] is the initial temperature of the gas.
[tex]{P_2}[/tex] is the final pressure of the gas.
[tex]{V_2}[/tex] is the final volume of the gas.
[tex]{T_2}[/tex] is the final temperature of the gas.
Calculation of the final pressure [tex]\left( {{{\mathbf{P}}_{\mathbf{2}}}} \right)[/tex] of the gas
Rearranging equation (3), we get:
[tex]{P_2} = \frac{{{P_1}{V_1}{T_2}}}{{{T_1}{V_2}}}[/tex] ...... (4)
We have [tex]{P_1} = 724\;{\text{mm Hg}}[/tex]
[tex]{V_1} = 3.05\;{\text{L}}[/tex]
[tex]{T_1} = 298\;{\text{K}}[/tex]
[tex]{V_2} = {\text{2}}{\text{.60 L}}[/tex]
[tex]{T_2} = {\text{273 K}}[/tex]
Substitute these values in equation (4).
[tex]\begin{gathered}{P_2}=\frac{{\left( {724\;{\text{mm Hg}}} \right)\left( {3.05\;{\text{L}}} \right)\left( {273\;{\text{K}}} \right)}}{{\left( {298\,{\text{K}}} \right)\left( {2.60\;{\text{L}}} \right)}} \\= 778.05705\;{\text{mm Hg}} \\ \end{gathered}[/tex]
Conversion Factor:
[tex]1\;{\text{mm Hg}} = {\text{0}}{\text{.00131579 atm}}[/tex]
So the value of [tex]{P_2}[/tex] (in atm) is calculated as follows:
[tex]\begin{gathered}{P_2}=\left( {778.05707\;{\text{mm Hg}}}\right)\left( {\frac{{{\text{0}}{\text{.00131579 atm}}}}{{1\;{\text{mm Hg}}}}} \right) \\= 1.023759\;{\text{atm}}\\\end{gathered}[/tex]
So the final pressure of the gas is 1.023759 atm.
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Ideal gas equation
Keywords: ideal gas, pressure, volume, absolute temperature, equation of state, hypothetical, universal gas constant, moles of gas, initial, final, P, V, T, P1, P2, V1, V2, T1, T2.
What needs to happen for a solute to dissolve in a particular solvent?
Answer:
There needs to be a strong interaction between solvent and solute molecules. However, this interaction must be strong enough to disrupt the molecular interactions between the solute molecules.
Explanation:
It is called solute, the chemical compounds that dissolve in another substance. The solvent is the substance into which the solute will be dissolved to form a new product.
Chemical dissolution is the process of dispersing the solute in a solvent, giving rise to a homogeneous solution or mixture. For such a dissolution to occur, an extremely strong chemical bond between the solute and the solvent must occur. However, this bond must be strong enough to separate the bond between the solute molecules.
The essential oil found in cloves, eugenol, can be isolated by steam distillation because it is insoluble in water and has a measurable vapor pressure at 100 °c even though it has a much higher boiling point than water. use data from the table to calculate the volume of eugenol in 30 ml of distillate.
Find the current through the 30.0 ω resistor.
Without the total voltage or detailed circuit configuration, it's not possible to determine the current through the 30.0 ω resistor. An example using Ohm's law has been provided for a hypothetical scenario.
Explanation:To find the current through the 30.0 ω resistor, we would need to apply Ohm's law, which states that I = V/R, where I is the current, V is the voltage, and R is the resistance. However, the provided information is insufficient to determine the current, as we are not given the total voltage across the resistor or the configuration of the circuit (whether it is series, parallel, or a combination).
If the 30.0 ω resistor were the only resistance in the circuit and the voltage across it was provided, we could directly use Ohm's law to calculate the current. For example, if the voltage was 10 V, the current would simply be I = 10V / 30.0ω = 0.333 A.
Without additional information, such as the configuration of the circuit and the total voltage, we cannot accurately calculate the current. The problem might be missing details or might require knowledge about the rest of the circuit to solve.
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Which of the following represents a compound?
A) H
B) H-3
C)H2O
D) O-16
A soluble iodide was dissolved in water. then, an excess of silver nitrate, agno3, was added to precipitate all of the iodide ion as silver iodide, agi. if 1.900 g of the soluble iodide gave 0.7158 g of silver iodide, how many grams of iodine are in the sample of soluble iodide?
If 150 g of phenacetin were dissolved in 100 ml of water, how much ether would be required to extract 90% of phenacetin in a single extraction?
what is the definition of tributary
A tributary is a smaller stream or river that flows into a larger one, contributing to its volume and influencing its navigability, ecosystem, and flooding potential.
Explanation:The definition of a tributary is a stream or river that flows into a larger stream, river, or lake. These smaller watercourses contribute to the flow of the larger one, which is often referred to as the mainstem or parent river. Tributaries do not flow directly into the sea. They provide additional water volume to their parent river, which can then affect the river's ability to navigate, its ecosystem, and potential for flooding. For example, the Missouri River is a tributary of the Mississippi River because it flows into it.
What is the mass (in grams) of 9.83 × 1024 molecules of methanol (CH3OH)?
What is the mass in grams of 6.5×10^20 molecules of aspirin (C9H8O4) ?
The mass in grams of 6.5×10²⁰ molecules of aspirin (C₉H₈O₄) is 0.194 g
From Avogadro's hypothesis,
6.02×10²³ molecules = 1 mole of C₉H₈O₄
Next, we shall determine the mass of 1 mole of C₉H₈O₄.1 mole of C₉H₈O₄ = (12×9) + (1×8) + (16×3)
= 180 g
Therefore, we can say that:
6.02×10²³ molecules = 180 g of C₉H₈O₄
With the above information, we can obtain the mass of 6.5×10²⁰ molecules of aspirin (C₉H₈O₄). This can be obtained as follow:6.02×10²³ molecules = 180 g of C₉H₈O₄
Therefore,
6.5×10²⁰ molecules = [tex]\frac{180 * 6.5*10^{20} }{6.02*10^{23}}\\\\[/tex]
6.5×10²⁰ molecules = 0.194 g
Thus, the mass of 6.5×10²⁰ molecules of aspirin (C₉H₈O₄) is 0.194 g
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The mass in grams of the aspirin is 0.194 g
From the question,
We are to determine the mass in grams of 6.5×10²⁰ molecules of aspirin (C₉H₈O₄)
First, we will determine the number of moles of aspirin present
Using the formula
[tex]Number\ of\ moles = \frac{Number\ of\ molecules}{Avogadro's\ constant}[/tex]
Avogadro's constant = 6.022 × 10²³ mol⁻¹
From the given information
Number of molecules of aspirin = 6.5×10²⁰ molecules
∴ Number of moles of aspirin present = [tex]\frac{6.5 \times 10^{20} }{6.022 \times 10^{23} }[/tex]
Number of moles of aspirin present = 0.0010793756 moles
Number of moles of aspirin present = 1.0793756 ×10⁻³ mole
Now, to determine the mass of aspirin present
From the formula
Mass = Number of moles × Molar mass
Molar mass of aspirin = 180.158 g/mol
∴ Mass of aspirin = 0.0010793756 × 180.158
Mass of aspirin = 0.194458 g
Mass of aspirin = 0.194 g
Hence, the mass in grams of the aspirin is 0.194 g
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How many liters of water are required to dissolve 1.00 g of barium sulfate?
To dissolve 1.00 g of barium sulfate, we would need 1 L of water.
Explanation:In order to calculate the amount of water needed to dissolve 1.00 g of barium sulfate, we need to use the molar mass of barium sulfate and the concept of molarity.
The molar mass of barium sulfate (BaSO4) is 233.43 g/mol. We can use this to convert the mass of barium sulfate to moles.
Once we know the number of moles of barium sulfate, we can use the molar ratio between barium sulfate and water to calculate the volume of water needed. The balanced equation for the dissolution of barium sulfate in water is:
BaSO4 (s) + H2O (l) → Ba2+ (aq) + SO42- (aq)
Based on this equation, 1 mole of barium sulfate dissolves to give 1 mole of water. Therefore, to dissolve 1.00 g of barium sulfate, we would need 1 L of water.
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Which equation best expresses the relationship between pressure and volume for gas?
Is the tetrapeptide ala-glu-gly-lys a good buffer at ph 7.0? will it move in an electric field at ph 7.0?
If the length of one side of a square is 12.0 m, what is the perimeter of the square? Express the perimeter with the appropriate units
The perimeter of a square whose length is 12.0 m is 48 cm.
Further Explanation Area Area is a measure of how much space is occupied by a given shape.Area of a substance is determined by the type of shape in question.For example;
Area of a rectangle is given by; Length multiplied by widthArea of a triangle = 1/2 x base x heightArea of a circle = πr². where r is the radius of a circle,Area of a square = S², Where s is the side of the square.etc.Perimeter Perimeter is defined as the distance along a two dimension shape. Perimeter of different shapes is given by different formulasFor example;
The perimeter of a rectangle = 2(length+width)The perimeter of a triangle = a+b+c; where a, b and c are the sides of the triangle. etc.In this case;
We are given one side of a square as 12.0 cm
But Perimeter of a square is given by; 4 × s
Thus; Perimeter = 4 × 12 units
= 48 units
Keywords; Perimeter, Area
Learn more about;Perimeter of a square example: brainly.com/question/3619302Area of a square: https://brainly.com/question/1322653Level: Middle school
Subject; Mathematics
Topic: Area and Perimeter
Final answer:
The perimeter of the square with a side length of 12.0 m is 48.0 m.
Explanation:
The perimeter of a square is the sum of all its sides.
Since all the sides of a square are equal, we can find the perimeter by multiplying the length of one side by 4.
For the given square with a side length of 12.0 m, the perimeter would be:
Perimeter = 12.0 m x 4
= 48.0 m
Why does ferrocene undergo the acylation reaction more readily than benzene?
What is the mass of 3.00 moles of magnesium chloride, MgCl2? Express your answer with the appropriate units.
The mass of 3.00 moles of magnesium chloride (MgCl₂) is 95.211 gram/mol.
This is determined by multiplying the number of moles by the molar mass of MgCl₂, which is 95.21 g/mol.
To find the mass of 3.00 moles of magnesium chloride (MgCl₂), we need to use the molar mass of MgCl₂ as a conversion factor. The molar mass of MgCl₂ is the sum of the atomic masses of magnesium (Mg) and chlorine (Cl).Steps for Problem Solving:
Determine the atomic masses from the periodic table: Mg = 24.31 g/mol, Cl = 35.45 g/mol.Calculate the molar mass of MgCl₂: Molar mass of MgCl₂ = 24.31 g/mol + 2(35.45 g/mol) = 95.21 g/mol.Use the molar mass to convert moles to grams: Mass (g) = Number of moles × Molar mass (g/mol).Substitute the known values: Mass (MgCl₂) = 3.00 moles × 95.21 g/mol = 285.63 g.Therefore, the mass of 3.00 moles of magnesium chloride (MgCl₂) is 24.305+ 2*35.453= 95.211 gram/mol.
Correct question is: What is the mass of 3.00 moles of magnesium chloride, MgCl₂? Express your answer with the appropriate units.
what are found on the right side of the arrow in a chemical reaction
In the shapes and fluid forces lab, you dropped different shapes in the fluid. what was the dependent variable that you observed and recorded
Answer is: Settling time.
Settling is the process by which substances (in this example with different shape) settle to the bottom of the fluid.
The two main variables in an experiment are the independent and dependent variable.
Dependent variable is the variable being tested and measured in a scientific experiment.
Dependent variables depend on the values of independent variables. The dependent variables represent the output or outcome whose variation is being studied.