A 100 gram gold nugget contains 5 grams of gold.
Then Percentage of gold in the gold nugget is
(5/100)*100 =5%.
What is Percentage ?A % in mathematics is a quantity or ratio that is stated as a fraction of 100 (from the Latin per centum, "by a hundred"). Although the abbreviations "pct.", "pct.", and occasionally "pc" are also used, the percent symbol, "%," is frequently used to indicate it. A % lacks dimensions and has no associated unit of measurement.
If there are 50 male pupils for every 100 overall students in the class, 50 of them will be male. There are 250 male students out of 500 total.
Long before the decimal system was developed, computations were frequently done using fractions that were multiples of one hundred.
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Would silicone breast implants be cov-ered by the ucc article 2 warranties? does implan-tation of silicone gel implants constitute a sale ofgoods by the surgeon?
Since silicone breast implants need a security and the implanter is required to guarantee and replace the implant fixture by the business or manufacturer in accordance with their rules, silicone breast implants are protected by UCC Article 2 warranties.
As per the mandate, drugs, medications, stents, implants and other consumables and incidentals given to patients during a medical procedure or treatment cannot be considered to be the sale of commodities and are therefore subject to taxation under state laws.
Hence, breast implants are covered under UCC Article 2 warranties and silicone gel implantation does not constitute sale of goods via the surgeon.
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If the fractional conversion in an ester interchange reaction is 0.99999, what would be the average degree of polymerization (pn or dp) of the polyester produced?
The fractional conversion in an ester interchange reaction is 0.99999
The average degree of polymerization (pn or dp) of the polyester produced = 0.99999/1 *100 = 99.999
What is degree of polymerization?
The quantity of monomer units in the polymer is known as the degree of polymerization (DP or Xn). It is determined as the molecular weight of the repeat unit divided by the molecular weight of the polymer. The two primary methods for measuring DP are number average DP and weight average DP.
This quantity of repeating units varies based on the type of polymer and its molecular weight and aids in determining the physical and chemical properties of a polymer. The degree of polymerization (DP), or the number of repeating units, is therefore calculated and is crucial in the polymer business.
The overall average degree of polymerization (pn or dp) of the polyester produced = 0.99999/1 *100 = 99.999
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What did you include in your response? Check all that apply.
Egyptians worked together to build the pyramids.
Quarries and ancient tools suggest that large slabs were created from rock beds.
The slabs were placed on sleds and pulled to the building site.
Oil was poured on the roadway to make the process easier.
This process is depicted in tomb paintings that date back to 1900 BCE.
All of the above apply.
Egyptians worked together to build the pyramids.
Quarries and ancient tools suggest that large slabs were created from rock beds.
The slabs were placed on sleds and pulled to the building site.
Oil was poured on the roadway to make the process easier.
This process is depicted in tomb paintings that date back to 1900 BCE.
How old are the pyramids in Egypt?The Giza Pyramids were designed to last forever, and they have. About 4,500 years ago, the enormous tombs from the Old Kingdom of Egypt were constructed.The pharaohs of Egypt believed that they would live forever as gods.How were pyramids constructed?The most likely scenario is that the Egyptians used a sloping and surrounding embankment made of brick, earth, and sand that was extended in height and length as the pyramid rose and up which stone blocks were towed using sledges, rollers, and levers.Why were the pyramids built?Pyramids were erected for cultic reasons. Egypt was one of the first civilizations to have this notion. They believed that everyone possessed a second self called the ka.After the death of the physical body, the ka had an everlasting existence.To learn more about pyramids visit:
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Why is the Heisenberg uncertainty principle true at the atomic level?
The Heisenberg uncertainty principle is true at the atomic level because we cannot simultaneously determine the accuracy of both velocity and the position of a particle.
What is the Heisenberg uncertainty principle?Heisenberg's Uncertainty Principle states that there is inherent uncertainty in the act of measuring a variable of a particle.
The Heisenberg uncertainty principle was found to be contrary to classical Newtonian physics which stipulates that all variables of particles to be measurable to an arbitrary uncertainty given standard equipment.
The Heisenberg uncertainty principle is true at the atomic level because we cannot simultaneously determine the accuracy of both velocity and the position of a particle.
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Consider a sealed 1 litre container which holds room air at standard atmospheric pressure. if the container is compressed to a volume of 0.5 litres, what would be the partial pressure of oxygen (po2)?
Partial pressure = total pressure * volume of gas.
Partial pressure of oxygen (po2) = 1*0.5 = 0.5 atm L
what is partial pressure?
According to Dalton's Law of Partial Pressure, the total pressure of a gas mixture is equal to the sum of the partial pressures of all the constituent gases that make up the mixture. Dalton's Law of Partial Pressure has a straightforward equation.
It claims that the overall pressure exerted by the combination of non-reactive gases is equal to the sum of the partial pressures of the various gases. The pressure applied by each individual gas in a gas mixture is referred to as partial pressure.
Partial pressure = total pressure * volume of gas.
Thus, given here,
volume = 0.5 l
Pressure = 1 atm at STP
Therefore, partial pressure of oxygen = 1*0.5 = 0.5 atm L
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An analytical chemist is titrating of a solution of benzoic acid with a solution of . the of benzoic acid is . calculate the ph of the acid solution after the chemist has added of the solution to it.
The pH of the acid solution after the chemist has added 172.mL of the KOH solution to it is 12.6.
What is meant by Benzoic acid?When potassium hydroxide and benzoic acid mix to make benzoate, the reaction produces a weak acid and its conjugated base, which causes the solution to function as a buffer. Benzoic acid, which has a molarity of 0.8700 M and a volume of 60.5 ml, is mentioned in the question. As a result, the moles of benzoic acid
Moles are determined by dividing the molarity by the volume of the solution.
=60.50 ml * 0.8700 M or 52.365 mmol, or 0.052365 mole
KOH, on the other hand, has a molarity of 0.3600 M and a volume of 172 ml when it is supplied. The KOH addition will therefore be measured in moles, where Mole = 0.3600 x 172 = 61.92 m Mole or 0.06192 Mole. Out of this 61.92 m mol,only 52.365 m mol of KOH will react with the benzoic acid. The moles of KOH, which remain unreactive is,
61.92 m moles - 52.365 m moles = 9.285 m moles or 0.009285 moles
The formula for calculating molarity is amount of moles / volume of solution in liters
The total volume of the solution is 172 ml + 60.5 ml = 232.5 ml or 0.2325 L
The molarity of KOH will be,
Molarity = 0.009285 moles / 0.2325 L = 0.0395 M
The dissociation of KOH takes place completely to produce hydroxide ion.
pOH = -log[0.0395] = 1.4
pH + pOH = 14
pH = 14 - 1.4 = 12.6
The complete question is,
An analytical chemist is titrating 60.5mL of a 0.8700M solution of benzoic acid HC6H5CO2 with a 0.3600M solution of KOH . The pKa of benzoic acid is 4.20 . Calculate the pH of the acid solution after the chemist has added 172.mL of the KOH solution to it. Note for advanced students: you may assume the final volume equals the initial volume of the solution plus the volume of KOH solution added. Round your answer to 2 decimal places.
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What byproduct of fermentation creates the characteristic holes in swiss cheese? select one:
a. carbon dioxide
b. lactic acid
c. ethyl alcohol
d. acetic acid
The byproduct of fermentation that creates the characteristic holes in swiss cheese is a. carbon dioxide.
Swiss cheese is a cheese made in Switzerland.
Swiss cheese is, usually, a semihard cheese made from cows milk with a characteristic holes.
Fermentation of milk is a metabolic process in which lactic acid and carbon dioxide are produced from sugar lactose:
C₆H₁₂O₆ → CH₃CHOHCOOH + C₂H₅OH + CO₂
Carbon dioxide (CO₂) is a gas. It gets stuck in swiss cheese and it makes bubbles, which make holes.
Fermentation is a way of extracting energy from molecules and it is the oldest metabolic pathway.
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If the oxygen is replaced by helium at the same temperature, how many kilograms of the latter will be needed to produce a gauge pressure of 7.10 atm?
The mass of the latter needed will be, 2.47 kg
Using the ideal gas equation:
where,
P = pressure of the gas
V = volume of gas
T = temperature of the gas
R = gas constant = 0.0821 L.atm/mole.K
w = mass of gas
M = molar mass of gas
The expression for two gases at the same temperature, and volume of gas will be:
where,
= pressure of O₂ gas = 8.20 atm
= pressure of He gas = 5.40 atm
= molar mass of O₂ gas = 32 g/mol
= molar mass of He gas = 4 g/mol
= mass of O₂ gas = 30.0 kg
= mass of He gas =?
Now put all the given values in the ideal gas equation, and we get:
(8.20 atm * 32 g/mol )/( 5.40 atm * 4 g/mol)
=2.47
Therefore, the mass of the latter needed will be, 2.47 kg
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Please help
use bond energies to determine the energy change for the following reaction: H2(g)+ Cl2(g) ⟶ 2HCl(g)
The heat of reaction is obtained as 190 kJ/mol .
What is the heat of reaction?The term heat of reaction is used to show the energy that is absorbed or emitted in a reaction. Recall that a reaction is exothermic when heat is given out and the reaction is endothermic when heat is absorbed.
In this case;
H- H bond energy = 436 kJ/mol
Cl - Cl bond energy = 242 kJ/mol
H - Cl bond energy = 432 kJ/mol
Then we know that;
ΔH reaction = ∑H products - ∑H reactants
We now have;
ΔH reaction = 2(432 kJ/mol) - [242 kJ/mol + 432 kJ/mol]
ΔH reaction = 864 kJ/mol - 674 kJ/mol
ΔH reaction = 190 kJ/mol
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What is the dissociation ratio of 1st dissociable proton of phosphoric acid at ph2.16, given the pka is 2.16 or ka is 6.92x10-3?
Phosphoric acid (H3PO4) has three dissociable protons, with the pKa's.
What is Phosphoric acid?With the chemical formula H3PO4, phosphoric acid, also known as orthophosphoric acid, monophosphoric acid, or phosphoric(V) acid, is an inorganic solid that contains phosphorus. Colorless and odorless, phosphoric acid is a substance. In its most common form, an 85% aqueous solution, it appears as a syrupy liquid that is colorless, odorless, and non-volatile. Considering that many fertilizers include it, it is a significant industrial chemical.
Acid makes up the substance. The phosphate ion PO results from the removal of all three H+ ions. H2PO, or hydrogen phosphate, is produced when one or two protons are removed, correspondingly. Organophosphate esters are produced by phosphoric acid.
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The mass percent of water in a hydrate of mncl2 is 36. 41%. What is the empirical formula of the hydrate?.
The empirical formula of the hydrate is written as MnCl₂. 4H₂O
If the mass percent of the water in hydrate is 36.41% then the mass percent of the manganese II Chloride is given by, 100-36.41%
Which equals to 69.59%
Now, we calculate the no. of moles of water and manganese,
No. of mole of water =Given mass/molecular mass
= 36.41/18= 2.02moles of H₂O
No. Of moles of manganese chloride, =given mass/molar mass
= 63.59/128.84 = 0.5 moles of manganese chloride.
Now , we calculate the no. Of water and manganese chloride in hydrate by dividing these moles with the smaller no. Of moles we have calculated.
Thus, no. Of moles of water in hydrate = 2.02/0.5 moles.
= 4moles.
No. Of moles of manganese chloride in hydrate is given by 0.5/0.5 = 1mol.
Thus, we have no. Of moles of water and manganese chloride, by this we calculate the emperical formula.
So, the emperical formula consist 4moles of water molecule and one mol of manganese chloride, i.e..
Emperical formula = MnCl₂. 4H₂O
Emperical formula is defined as the ratio of the no. Of atoms present in molecules of the compound in a very simplest whole number.
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How many milliliters of rubbing alcohol (isopropyl alcohol) weighs 500. grams? the density of isopropyl alcohol is 0.785 g/ml.
The volume occupied of isopropyl alcohol with a density of 0.785 g/ml and a mass of 500 g is: 636.94 ml
The density formula and the procedure we will use is:
d = m/v
Where:
v= volumed= densitym= massInformation about the problem:
d= 0.785 g/mlm = 500 gv = ?Applying the density formula and clearing the volume we get:
d = m/v
v = m/ d
v = 500 g / 0.785 g/ml
v = 636.94 ml
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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The percent of heat radiation reflected by the different types of surfaces that earth has (i.e. snow, rock, forest, etc.) can be quantified or measured as?
The percent of heat radiation reflected by the different types of surfaces that Earth has (i.e snow, rock, forest, etc.) can be quantified or measured as Albedo.
Albedo is the percentage of sunlight that is reflected off of a surface. The higher the albedo, the more reflective the surface is. Different surfaces have different albedos. For example, fresh snow has a high albedo, while a forest has a low albedo.
The albedo of a surface can have a big impact on the climate. If a surface has a high albedo, it will reflect more heat and stay cooler. If a surface has a low albedo, it will absorb more heat and become warmer.
You can measure the albedo of a surface with a simple device called an albedometer. By measuring the amount of sunlight that is reflected off of a surface, you can calculate the albedo.
Surfaces with a high albedo are important in helping to regulate the Earth’s climate. They help keep the Earth cool by reflecting back sunlight.
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3. Which best explains the flow of energy in an internal combustion engine?
O
A. Work is converted into energy stored in chemical bonds.
B. The expansion of gases is used to do work.
C. Heat is converted into work to power the engine.
D. An increase in pressure is converted into heat and work.
Check Answer
An increase in pressure is converted into heat and work, explains the flow of energy in an internal combustion engine. Gasoline is ignited and consumed within an internal combustion engine (ICE) by the engine itself.
The engine then partially transforms the energy from combustion into work. The engine is composed of a fixed cylinder and a rotating piston. There are three main types of internal combustion engines in use today: the spark ignition engine, which is mainly used in automobiles; the diesel engine, which is used in heavy machinery and industrial systems and has an advantage over the more compact and lighter ones due to improvements in cycle efficiency.
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Figure 1 shoes an outline of the modern periodic table
Two cars A and B are moving with velocities of 10m/s and 6m/s in the same direction respectively. What is the relative velocity of Car A with respect to Car B.
The relative velocity of Car A with respect to Car B, Vab = 16m/s.
Equation :Given,
Va = 10m/s
Vb = 6m/s
Vab = ?
So,
To find Vab of the car A and car B
We know the car A velocity and as both the car the in same direction so to to know average speed or velocity car B velocity taken in negative.
So,
We can put formula,
Vab = Va - (-Vb)
Vab = 10m/s - (-6m/s)
Vab = 16m/s
What is relative velocity?The velocity of an object when compared to another observer is known as its relative velocity. It is the rate at which one object's relative position changes in relation to another object over time.
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click on the muscle types
cardiac
weak
strong
elbow
skeletal
smooth
Answer:
cardiacskeletalsmoothExplanation:
Cardiac, skeletal and smooth muscles are the three types of muscles.
Does a reaction occur when aqueous solutions of silver(i) acetate and nickel(ii) iodide are combined?
Yes, the reaction occurs when aqueous solutions nickel(II) iodide.
What is aqueous solutions?A solution in which the solvent is water is referred to as an aqueous solution. By adding (aq) to the appropriate chemical formula, it is typically shown in chemical equations. For instance, Na+(aq) + Cl might be used to represent a table salt solution (also known as sodium chloride, or NaCl) in water (aq). The word aqueous, which derives from the Latin word aqua, denotes being or consisting of water.
Water is a common solvent in chemistry since it works great as a solvent and is also readily available. The phrase "solution" often refers to an aqueous solution because water is frequently used as the solvent in experiments, unless otherwise stated.
The term "non-aqueous solution" refers to a solution in which the solvent is a liquid but not water.
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A buffer consists of c5h5nc5h5n (pyridine) and c5h6n c5h6n . write the equation for the reaction that occurs when strong acid (h3o )(h3o ) is added to the buffer.
The balanced chemical equation for the reaction that occurs when strong acid H₃O⁺ is added to the buffer:
C₅H₅N + H₃O⁺ → C₅H₅NH⁺ + H₂O
A buffer can be defined as a substance that prevents the pH of a solution from changing by either releasing or absorbing H⁺ in a solution.
Buffer is a solution that can resist pH change upon the addition of an acidic or basic components and it is able to neutralize small amounts of added acid or base, pH of the solution is relatively stable.
This buffer is example of weak acid (C₅H₅NH⁺) and its conjugate base (C₅H₅N).
C₅H₅NH⁺ gain protons from strong acid H₃O⁺.
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A marathon is 26.2 miles long. How long is a marathon in meters?
Answer:
42195 meters
Answer:
26.2 miles = 42164.81
Explanation:
1 mile is 1609.34 meters so multiply that by 26.2 miles and you have your answer
What is the difference between the sum of the measures of the interior angles in an octagon and the sum of the measures of the interior angles in a hexagon?.
The difference between the sum of the measures of the interior angles in an octagon and the sum of the measures of the interior angles in a hexagon is 360°.
Interior angle refers to the angle inside a polygon that is formed by two of its adjacent sides. The sum of the measures of the interior angles of a polygon is given by the equation:
180°(n - 2)
where n is the number of sides
An octagon is a polygon that has 8 vertices and 8 sides. The sum of the measures of the interior angles of an octagon is:
180°(8 - 2) = 180°(6) = 1080°
On the other hand, a hexagon is a polygon that has 6 vertices and 6 sides. The sum of the measures of the interior angles of an octagon is:
180°(6 - 2) = 180°(4) = 720°
Subtracting the sum of the interior angles of the two polygons,
1080° - 720° = 360°
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PLEASE HELP ASAP ILL RATE U 5 STARS!!
Using the periodic table, The Bohr - Rutherford diagram of each of the elements is before bonding and after bonding is attached below.NH[tex]_{3}[/tex] ( ammonia ) is a covalent bond.
Ammonia is a covalent compound because in the formation of ammonia the bond between nitrogen and three hydrogen is formed by the sharing of electron.
Covalent bond is formed by sharing of electron between atoms. Ionic bond is formed when one atom loses electron and other atom gain the electron or by the transfer of electron from one atom to another.
Hence,In the case of ammonia a covalent bond is formed and the electronegativity difference between nitrogen and hydrogen is not big enough to make a covalent bond.
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Which statement best describes the difference between a compound and a mixture?
A: Compounds are physical combined, but mixtures are chemically combined.
B: Compounds are pure substances, but mixtures are not.
C: Compounds and mixtures are both heterogeneous.
D: All compounds are homogenous, but all mixtures are heterogeneous.
The correct answer is [D]
All compounds are homogenous, but all mixtures are heterogeneous.
What is the difference between homogenous and heterogenous?The words homogeneous and heterogeneous are often used in scientific contexts to describe the kinds of mixtures, but they can be also used in other ways, such as to describe groups of people.
Homogeneous mixtures are uniform in the structure or composition. For example, if you mix the table salt into water, this mixture is homogeneous because the salt completely dissolves into the water, meaning that the salt particles are evenly distributed throughout the water. Homogeneous mixtures are typically those whose component parts cannot be easily separated (such as in example of the salt water mixture).
In the contrast, heterogeneous mixtures consist of distinct substances and don’t have a uniform composition. As a simplified example, a salad is the heterogeneous mixture: you can see that salad obviously consists of different, separate ingredients, such as lettuce, tomatoes, and carrots. If you scoop out some of the salad into a bowl, it may not have same number of tomatoes as another scoop. The ingredients don’t blend together into a uniform whole but remain separate from each other and are unevenly distributed throughout mixture.
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why is it important to begin a experiment with a clean and dry crucible
please actually answer the questions
What is the independent variable?
what is the dependent variable?
what are the constants?
what equipment and materials will you use? (please include amounts and use SI units if possible)
what data and observations will you record?
what safety precautions will you take?
what is the general procedure you will follow for your experiment?
Answer:
Banana Bread
Baking Soda
Other ingredients
Baking equipment
How a quantity of baking soda will affect the Banana Bread
Wear oven mitts when putting bread in the oven to bake
If I initially have a gas at a pressure of 12atm, a volume of 23 liters, and a temperature of 200 K, and then raise the pressure to 14 atm and increase the temperature to 300 K, what is the new volume of the gas
The new volume of the gas is 30 L.
P1=12 atm;V1=23 L
;T=200 K
P2=14 atm
;V2=?;mllT2=300 K
What is Charles Boyle's law?The difference between two initial known values of either temperature (T2) or volume (V2) is included in the computations of Charles' Law: According to Boyle's Law, the volume of a given volume of gas sustained at a certain temperature decreases inversely with the applied pressure while the temperature and mass are both constant.
Boyle's Law states that a gas's pressure and volume are both constant at a certain temperature. Increased pressure causes a reduction in volume while the temperature stays constant.
Charles' law ensures that the gas's pressure, volume, and temperature remain constant. Boyle's law, in contrast, guarantees that the gas's temperature and pressure will remain constant.
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A mixture of reactants and products for the reaction shown below is at equillibrium in a 5.0L container. what would most likely happen to the the equilibrium if the volume in the container were reduced to 3.0L
N₂(g) + 3H₂(g) → 2NH₃(g)
A. more N2 and H2 would be produced until a new equilibrium position was reached
B. more N2,H2,NH3 would be produced until a new equilibrium position was reached
C. more NH3 would be produced until a new equilibrium position was reached
D. the concentrations of N2, H2, and NH3 would decrease until equilibrium has been reached again
If the volume is reduced, it then follows that; more N2,H2,NH3 would be produced until a new equilibrium position was reached.
What is the equilibrium situation?We know that a dynamic equilibrium occurs when the rate of forward reaction is equal to the rate of reverse reaction. In that case, the reactants disappear at the same rate as the products appear.
Now, we have the reaction; N₂(g) + 3H₂(g) → 2NH₃(g) In which case, the volumes to the left hand side of the reaction equation is smaller than the volume to the right hand side of the reaction equation.
If the volume is reduced, it then follows that; more N2,H2,NH3 would be produced until a new equilibrium position was reached.
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What is the mass % of ethylene glycol in a 1.81 M solution of ethylene glycol (MM = 62.07 g/mol) in water? The density of the solution is 1.07 g/mL.
The mass percent of ethylene glycol in a 1.81 M aqueous solution, whose density is 1.07 is 10.5%
First, we will calculate the mass of ethylene glycol in 1 L of the solution.
There are 1.81 moles of ethylene glycol per liter of solution.
The molar mass of ethylene glycol is 62.07 g/mol.
1 L Solution = (1.81/ 1L of solution) × (62.07/1 mol EG) = 112.3g EG
Now, we will calculate the mass of 1 L (1000 mL) of the solution, considering its density is 1.07 g/mL.
1000mL × 1.07/ mL = 1070g
There are 112.3 g of ethylene glycol in 1070 g of solution.
Therefore,The mass percent of ethylene glycol is:
%EG = 112.3g/ 1070g × 100 = 10.5 %
The mass percent of ethylene glycol in a 1.81 M aqueous solution, whose density is 1.07, is 10.5%.
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What is the iupac name of the following compound . vinylcyclohexane b. ethynylcyclohexane c. allylcyclohexane d. acetylcyclohexane
IUPAC name of vinylcyclohexane is vinylcyclohexane, ethynylcyclohexane is 1-ethynylcyclohexane, allylcyclohexane is prop-2-enylcyclohexane and of acetylcyclohexane is 1-Cyclohexylethan-1-one.
IUPAC stands for International Union of Pure and Applied Chemistry. It is the universally-recognized authority on chemical nomenclature. It is based on naming the molecule's longest chain of carbons connected by single bonds, whether in a continuous chain or in a ring.
It creates a standardized way to name chemical compounds. The use of Common names can lead to confusion and misinformation.
IUPAC name of vinylcyclohexane is 1-ethenylcyclohexane.
IUPAC name of ethynylcyclohexane is 1-ethynylcyclohexane.
IUPAC name of allylcyclohexane is prop-2-enylcyclohexane.
IUPAC name of acetylcyclohexane is 1-Cyclohexylethan-1-one.
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