Whether in an alkali (pink) or an acid (colorless) solution, the phenolphthalein indicator has one of two distinct structures. Both structures are light-absorbing in the ultraviolet spectrum, which the human eye cannot see. So it is challenging.
What is phenolphthalein? The phthalein family of chemical compounds includes the indicator phenolphthalein (C20H14O4). The powder is a thin, crystalline yellowish-white to light orange powder. It has a pKa of 9.3, is barely soluble in water, and, when dissolved in alcohol, is used as an indicator for acid-base titration investigations.It is colorless in liquid form until pH 8.5 when it transforms from pink to dark red. Adolf von Baeyer, a German chemist, created phenolphthalein in 1871. He produced it by fusing phenol and phthalic anhydride in the presence of sulfuric acid (H2SO4) or zinc chloride. Phenolphthalein is closely linked to the triphenylmethane dyes (ZnCl2). The abbreviation "HIn" or "php" in shorthand notation is frequently used to refer to the chemical compound phenolphthalein, which has the formula C20H14O4. Its structure consists of 2 alcoholic groups, one ketone group, three hexagonal structures, and one pentagonal structure. Another compound with carbon, hydrogen, and oxygen chain structure is phenolphthalein.Phenolphthalein is frequently used as an indicator in acid-base titrations. Due to its water solubility, phenolphthalein is frequently dissolved in alcohols before use in experiments. It is a weak acid that can lose H+ ions in solutions. While the ion of phenolphthalein is purple, the phenolphthalein molecule is colorless.A common indicator used in titration experiments to show the titration's endpoint is phenolphthalein, an inert, colorless acid. Since this molecule dissociates to generate pink anions when dissolved in water, the endpoint is signaled by the production of pink color.To learn more about phenolphthalein, refer to:
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How does a heterogeneous mixture differ from a homogeneous mixture? How are they similar?
A homogenous mixture has uniformly dispersed components while a heterogeneous mixture does not.
Homogenous vs heterogeneous mixturesFirst of all, both homogenous and heterogenous mixtures consist of 2 or more non-reacting chemical components.
In homogenous mixtures, the chemical components are uniformly dispersed throughout the entire mixture.
In heterogeneous mixtures, the reverse is the case. The components are not uniformly dispersed. They are skewed to a particular side.
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A boy of mass 60 kg and a girl of mass 40 kg are together and at rest on a frozen pond and push each other apart. The girl moves in a negative direction with a speed of 3 m/s. What must be the total final momentum of the boy and girl combined?
A. 120 kgm/s
B. -100 kgm/s
C. 0 kgm/s
D. -120 kgm/s
The aggregate ultimate momentum of the boy and girl must be 0 kgm/s (option C).
Conservation of momentum:
According to the principle of momentum conservation, momentum is only modified by the forces acting as they are outlined by Newton's equations of motion; momentum is never generated nor destroyed inside a problem domain.
Example- A bullet leaves the pistol when it is fired and picks up speed. The gun recoils to maintain the system's motion. After the pistol is discharged, the total momentum of the pistol and the bullet will be zero in accordance with the law of conservation of momentum.What is Momentum?
A characteristic of a moving body that it possesses due to its mass and motion and is equal to the sum of its mass and speed.
Therefore, according to the momentum conservation law, it can be concluded that the aggregate end momentum of the boy and girl must be 0 kgm/s (option C).
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Identify all resonance forms of the enolate formed, and indicate whether or not a substantial amount of starting ketone will be present together with the enolate at equilibrium. (select all that apply)
At equilibrium, a significant quantity of starting ketone will be present with the enolate in the first case.
What is ketone?Ketones are substances produced by the liver. It is formed when there is insufficient insulin in the body to turn sugar into energy.
What happens in scenario two where the formation of possible enolate ions from the cyclohexan-1, 4-di.ketone by abstraction of acidic proton by suing sodium ethoxide base occurs?In this case a substantial amount of ketone will exist along side the enolate at equilibrium.
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Calculate the pH if the [H^+] = 9.71 ×
10^-8
Answer:
pH = 7.01
Explanation:
The pH can be calculated using the formula:
pH = -log[H⁺]
In this formula, [H⁺] represents the concentration of H⁺. Since you have been given this value, you can easily find the pH.
pH = -log[H⁺]
pH = -log[9.71 x 10⁻⁸]
pH = 7.01
Cabbage juice indicator solutions can show pH values from acidic to basic.
Which color represents the most basic solution?
Which color represents the most acidic solution?
Which color represents a neutral solution?
More acid solution has red colour, more basic solution has purple colour whereas neutral solution has green colour.
Which color represents the most acidic solution?As the solution becomes more acidic, the color of the solution changes from green toward red.
Which color represents the most basic solution?As the solution becomes more basic, the color changes of the solution from green toward purple.
Which color represents a neutral solution?Green color of the solution represents a neutral solution having pH 7.
So we can conclude that More acid solution has red colour, more basic solution has purple colour whereas neutral solution has green colour.
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A teacher divides her class into four groups. She assigns
each group the task of measuring the temperature of a
given object three times. The teacher already knows that
the temperature of the object is 31°C.
Based on each group's results, which group makes the most precise
measurements of the object's temperature?
A. Group A: 31.0°C, 32.0°C, 30.0°C
B. Group B: 29.5°C, 33.0°C, 31.8°C
C. Group C: 32.1°C, 31.9°C, 31.8°C
D. Group D: 29.0°C, 35.0°C, 32.0°C
The group that makes the most precise measurements of the object's temperature is Group C : 32.1°C, 31.9°C, 31.8°C. That is option C.
What is a precise measurement?Precise measurement are those values that are gotten during a measurement which when compared are closest to the given constant value.
Precision refers to a value in decimal numbers after the whole number, and it does not relate with accuracy.
From the measurement gotten from the different groups, the results that are precise are the results of group C.
This is so because,
32.1-31 = 1.131.9-31 = 0.931.8- 31 = 0.8All the values gotten are in decimals as stated above. Therefore, the group that makes the most precise measurements of the object's temperature is Group C.
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A measure of peak separation in a chromatographic method that equals the difference in retention time for two components divided by the average of their peak widths is the definition of
A measure of peak separation in a chromatographic method that equals the difference in retention time for two components divided by the average of their peak widths is the definition of resolution.
Retention time can be referred to as the amount of time a solute spends in the stationary and mobile phases of a column.
The analyte's interaction with the stationary phase determines the longer retention period.
The duration of retention will increase as the interaction becomes more strong.
Resolution is defined as the peak separation in a chromatographic procedure that is equal to the difference in retention time for two components divided by the average of their peak widths.
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Which color change represents a positive reaction for the presence of sugar using the Benedict's test
Answer:
my best answer is blue
Explanation:
1. Explain why halogens are rarely found in native state?
Halogens are rarely found in native state because halogens are highly reactive.
What is Halogens ?The group 17 elements are known as Halogen group. These elements include Fluorine, Chlorine, Bromine, Iodine and Astatine. Halogens react with metals to form salts. Halogens are non metals. Halogens are highly reactive and halogens are never found in pure form. Halogens not occur in free state.
How many valence electron are present in Halogens ?Halogens have seven valence electrons in the outermost shell. The electronic configuration of Halogen is ns² np⁵.
Thus from the above conclusion we can say that Halogens are rarely found in native state because halogens are highly reactive.
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The following is the reaction showing the complete neutralization of calcium hydroxide (a base) with phosphoric acid:
3Ca(OH)2(aq) + 2H3PO4(aq) → Ca3(PO4)2(s) + 6H2O(ℓ)
A stock solution of calcium hydroxide (base) is made by dissolving 3.51 grams of it into some water and the volume is brought to 750 mL. A 50.0 mL portion of that stock solution is then titrated with a solution of 0.229 M phosphoric acid. How many milliliters (mL) of the acid are needed to completely neutralize the base in this reaction? (tolerance is ±0.1 mL)
9.17 milliliters (mL) of the acid are needed to completely neutralize the base in this reaction.
What is a neutralization reactionA neutralization reaction is a reaction between an acid and a base to produce a salt and water only.
The process of reacting given volume of acids or bases to determine the concentration or volume of either the acid or base required for neutralization is known as titration in volumetric analysis.
The formula to determine the volume of the acid required is given below:
[tex]\frac{C_{a}V_{a}}{C_{b}V_{b}} = \frac {N_{a}}{N_{b}}[/tex]
where [tex]V_{a[/tex] is the volume of acid required
[tex]V_{a} = \frac {C_{b}V_{b}N_{a}}{C_{a}N_{b}}[/tex]
Concentration of base, Cb = (3.51/74)/0.75 = 0.063 M
Vb = 50. 0 mL
Ca = 0.229 M
Na = 2
Nb = 3
Va = (0.063 * 50 * 2)/(0.229 * 3)
Va = 9.17 mL
In conclusion, the volume of the acid is determined from the concentration, volume and mole ratio of the reaction.
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What are the spectator ions when k2s and mgcl2 are combines
The spectator ions of when k2s and mgcl2 are combined are 1. Cl- (aq) and 2. K (aq)
the balance equation of MgCl2 and K2S is as follows:
MgCl2(aq) + K2S(aq) ------> MgS(s) + 2KCl(aq)
the net ionic equation is as follows:
Mg 2+ (aq) + 2 Cl- (aq) + 2K (aq) + S 2- (aq) = MgS(s) +2 Cl- (aq) + 2K (aq)
The overall reaction is as follows:
Mg 2+ (aq) + S 2- (aq) = MgS(s)
Thus the spectator ions are the following:
Cl- (aq)
K (aq)
If we compare the solutions before and after the reaction, sodium and nitrate ions are present in both the solutions. They do not undergo any chemical exchange at all. These ions are called spectator ions since they don't participate in the chemical reaction at all (they simply "watch").
Compare the reactant and product sides of the rewritten reaction and cross out the spectator ions. Any dissolved ions that appear in the same form on both sides are spectator ions.
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Which compound is not required for the oxidative decarboxylation of pyruvate to form acetyl-coa?
The compound that is not required for the oxidative decarboxylation of pyruvate to form acetyl-CoA is ATP.
What is oxidative decarboxylation?The chemical process of oxidative decarboxylation is an oxidative process where carboxylate groups are eliminated to form CO2.
The process of oxidative decarboxylation is associated with cellular respiration, which generates ATP as a product (instead of reactant).
In conclusion, the compound that is not required for the oxidative decarboxylation of pyruvate to form acetyl-CoA is ATP.
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When testing the temperature of catalase, what would happen if you changed the temperature using the same tube with the same catalase and hydrogen oxide mixture?.
If we change the temperature using same tube with the same catalase and hydrogen oxide mixture, the hydrogen peroxide will break into oxygen and water molecule.
What is catalase?It is an enzyme which catalyses the decomposition reaction of hydrogen peroxide to water and oxygen.
Its function is to protect the oxidative damage by ROS
ROS is reactive Oxygen Species.
What is an enzyme?Enzymes are made of proteins which catalyses the biological reaction.
Effect of temperature on catalase:Increase of temperature results in the loosening of hydrogen bond and helps the catalase to decompose hydrogen peroxide.
The change in temperature using same tube with the same catalase and hydrogen oxide mixture, the hydrogen peroxide will break into oxygen and water molecule.
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What amino acid is formed using the n-phthalimidomalonic ester synthesis when the following alkyl halides are used in the third step?.
Threre are two amino acid is formed using the n-phthalimidomalonic ester synthesis when the following alkyl halides are used in the third step -
a. leucine
b. methionine
What is Gabriel malonic ester synthesis?
A reaction that enables us to generate amino acids is the Gabriel synthesis, also referred to as the Gabriel malonic ester synthesis. We can convert primary alkyl halides into primary amines using this procedure. Remember that 19 of the 20 amino acids are actually primary amines.Who should not take methionine?
Supplemental methionine shouldn't be used by people with the genetic condition homocystinuria type I. Methionine can become more homocysteine if you take methionine supplements without getting enough folic acid, vitamin B-6, or vitamin B-12. Your risk of heart disease could rise as a result.What does leucine do in the body?
Leucine is an essential amino acid for protein synthesis. Additionally, similarly to other amino acids, the carbon skeleton of leucine can be used to generate ATP. However, leucine can also regulate several cellular processes such as protein synthesis, tissue regeneration, and metabolism.Learn more about Gabriel malonic ester synthesis
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The complete question is -
What amino acid is formed using the N-phthalimidomalonic ester synthesis when the following alkyl halides are used in the third step?
a. Ch3Ch(Ch3)Ch2-Br
b. Ch3SCh2Ch2-Br
Vanillin the flavoring agent in vanilla has a mass percent composition of 63.15 per h ,31.55per o. determine the empirical formula and molecular formula if molecular mass of vanillin is 152.15 g/mol
Empirical formula and Molecular formula:
Vanillin has the empirical formula C₈H₈O₃ and the molecular formula C₈H₈O₃, they both are same.
What is Vanillin?
Vanillin has the chemical formula C₈H₈O₃ and is classified as an organic compound. It is an aldehyde that is phenolic. Ether, hydroxyl, and aldehyde are some of their functional groups. It is the key ingredient in vanilla bean extract.C, H, and O are present in this compound,
Mass percent composition = Divide by their atomic mass
C = 63.15/12.0107 = 5.2578
H = 5.30/1.0079 = 5.2582
O = 31.55/16 = 1.9719
Thus, the ratio of
carbon : hydrogen : oxygen
5.257811784 : 5.258249499 : 1.97199825
division of all numbers by the smallest we get,
2.666235523 : 2.666457488 : 1
further dividing it by 3 we get,
7.998706568 : 7.999372463 : 3
thus the ratio becomes 8:8:3
Therefore, the empirical formula is C₈H₈O₃
Empirical formula mass = (12x8) + (1x8) + (16x3)
= 96 + 8 + 48
= 152
n = Molecular mass of Vanillin/ Empirical formula mass
= 152.15/152
= 1.0009
Since the n-value is near to 1 thus the molecular formula will also be the same.
Therefore the molecular formula = C₈H₈O₃
Note: Your question is incomplete, but most probably your full question was Vanillin the flavoring agent in vanilla has a mass percent composition of 63.15 per h ,31.55per o and 5.30%H. determine the empirical formula and molecular formula if molecular mass of vanillin is 152.15 g/mol
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Half-life expressions can be derived from?
Different half-life expressions can be chemically derived from integrated rate laws.
What are integrated rate laws?In chemistry, the expression 'integrated rate laws' makes reference to the integration of different rate laws.
The constant rate refers to the specific amount of a given substrate or reactant that is used in a chemical reaction to produce a specific amount of product during such reactions.
The constant rate is very useful to determine the time required to generate a given amount of a product in a given chemical reaction (expressed per unit of time).
In conclusion, different half-life expressions can be chemically derived from integrated rate laws.
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In which form are water molecules most closely bonded to each other?
Answer:
In solid
Explanation:
As a solid has very tightly packed molecules which move very difficulty and only vibrate
There are exactly 1000 m in 1 km. how many significant figures does this number have?
Answer:
There is 1 significant figure
Explanation:
In the number 1000, 1 is the only number that counts as a significant figure since the zeros are not in between two non-zero numbers, and there isn't a decimal place either.
Ethene is exposed to h2 in a solution containing a chunk of solid palladium. if it reacts successfully, the original alkene will:________
If ethene and hydrogen reacts successfully in a solution containing a chunk of solid palladium, the original alkene will become unsaturated.
What is hydrogenation?The term hydrogenation is used in chemistry to describe that addition of hydrogen to an unsaturated compound. Recall that ethene is an un saturated compound (alkene) and one of the reactions that an unsaturated compound can undergo is the addition of atoms or group across the double bond to yield adducts.
In this case, the adduct is a compound that is saturated ad will not have the same properties as ethene because the carbon carbon double bond that was characteristic of ethene has been replaced by a carbon carbon single bond.
Thus, if ethene and hydrogen reacts successfully in a solution containing a chunk of solid palladium, the original alkene will become unsaturated.
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__Pb(NO3)2 + __NaCI = __NaNO3 + __PbCI2
Answer:
Pb(NO3)2 + 2NaCl = 2NaNO3 + PbCl2
What amino acid residue present in the specificity pocket allows trypsin to bind to peptides containing arg or lys?
The amino acid residue present in the specificity pocket allows trypsin to bind to peptides containing arg or lys will be "Asp".
Chymotrypsin breaks down peptide bonds following side chains with a lot of mass or fragrance, like those found in the amino acids phenylalanine as well as tyrosine. The substrate-binding site, also known as the specificity pocket, contains deep and features hydrophobic side chains.
A medium-sized globular protein called trypsin, also known as serine protease 1, serves as a pancreatic serine protease. This enzyme breaks down peptides on the C-terminal portion of the amino acid sequences lysine as well as arginine to hydrolyze bonds.
Therefore, the amino acid residue present in the specificity pocket allows trypsin to bind to peptides containing arg or lys will be "Asp".
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Assume there is an equal mass of each gas at a given temperature and pressure. Arrange the following gases based on the amount of volume they occupy, from the largest to the smallest volume.
At a given temperature and pressure, the arrangement of gases based on the amount of volume they occupy, from the largest to the smallest volume is CH[tex]_{4}[/tex] < NH[tex]_{3}[/tex] < Ar < SO₂ < Cl₂ .
According to Avogadro's law, all gases with an identical volume and the same temperature and pressure have an equal number of molecules.
If the temperature and pressure are constant, the volume and amount (in moles) of an ideal gas for a given mass are directly proportional.
The volume of gas ∝ No. of moles of gas
It means that the more the no. of moles of gas, the greater will be the volume of gas.
Now, No. of moles = Given mass/ Molar mass
Given,
There is an equal mass of each gas at a given temperature and pressure.
So,
No. of moles is inversely proportional to the Molar mass of the gas.
Therefore we can conclude that the less the molar mass of gas, the more will be the no. of moles and the higher will be the volume of that gas.
The gas with the least molar mass will occupy the highest volume.
The molar mass of [tex]CH_{4}[/tex] = 16g/mol
The molar mass of [tex]NH_{3}[/tex] = 17g/mol
The molar mass of [tex]Cl_{2}[/tex] = 70g/mol
The molar mass of Ar = 40g/mol
The molar mass of [tex]SO_{2}[/tex] = 64g/mol
Arrangement of gases on basis of molar mass
Cl₂ < SO₂ < Ar < [tex]NH_{3}[/tex] < [tex]CH_{4}[/tex]
So Arrangement on basis of decreasing volume
[tex]CH_{4} < NH_{3} < Ar < SO_{2} < Cl_{2}[/tex]
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Which of these is the byproduct of fuel combustion that may result in death if such combustion equipment is not properly vented.
a. radon
b. lead
c. oxygen
d. carbon monoxide
Carbon monoxide is the byproduct of fuel combustion that may result in death if such combustion equipment is not properly vented and is denoted as option D.
What is Carbon monoxide?This is a compound which is derived from the combustion of carbon in insufficient supply of oxygen. Carbon monoxide when inhaled replaces the oxygen content in the body which is dangerous because oxygen is needed for the survival of the cells of the body.
The carbon monoxide is usually formed when there is no properly vent thereby resulting in insufficient supply of air. This therefore results in its presence in the body results in the death of cells of the body system.
This is therefore the reason why carbon monoxide was chosen as the most appropriate choice.
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please help me with this questio
The mass of the precipitate is 8.74 g and the concentration of the calcium nitrate is 0.061 M.
What mass of precipitate is formed?The reaction is given by; 2AgNO3(aq) + CaCl2 (aq) ------>2AgCl(s) + Ca(NO3)2(aq)
Number of moles of AgNO3 = 195/1000 * 0.500 = 0.0975 moles
Number of moles of CaCl2 = 305/1000 * 0.100 = 0.0305 moles
If 2 moles of AgNO3 reacts with 1 mole of CaCl2
0.0975 moles reacts with 0.0975 moles * 1 mole / 2 moles = 0.04875 moles
Thus CaCl2 is the limiting reactant.
1 mole of CaCl2 produces 2moles of AgCl
0.0305 moles produces 0.0305 moles * 2 moles/ 1mole
= 0.061 moles
Mass of precipitate = 0.061 moles * 143.32 g/mol
= 8.74 g
Now 1 mole of CaCl2 produces 1 mole of Ca(NO3)2
Total volume of solution = 195 ml + 305 ml = 500 ml or 0.5 L
Concentration of Ca(NO3)2 = 0.0305 moles/ 0.5 L
= 0.061 M
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Treatment of DCS may involve: Select one: In-water recompression. Administration of pure oxygen. Recompression in a hyperbaric chamber. Both the second and third answers are correct.
Treatment of DCS may involve Recompression in a hyperbaric chamber.
Hence, Option (3) is correct answer.
What is DCS ?DCS is Decompression Sickness which is followed by recompression in a hyperbaric chamber. They prevent long term effects. It is also known as generalized barotrauma. It occur mostly in Scuba divers.
What are the Sign and Symptoms of DCS ?The sign and symptoms of DCS are
Skin itchShortness of breathA blotchy rashPain in joints or armDizzinessThus from the above conclusion we can say that Treatment of DCS may involve Recompression in a hyperbaric chamber.
Hence, Option (3) is correct answer.
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How does the phase diagram of a substance illustrate the relationship between temperature and kinetic energy of molecules
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance.
What is a Phase diagram ?These diagrams indicate the physical states that exist under specific conditions of pressure and temperature, and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points).
At low temperatures, most substances are solid; as the temperature increases, they become liquid; at higher temperatures still, they become gaseous.The phase change between a liquid and a gas has some similarities to the phase change between a solid and a liquid.Learn more about Phase diagram here:
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Briefly explain how a titration experiment can be used to determine the concentration of a strong acid or strong base solution?
Answer:During an acid-base titration, an acid with a known concentration is slowly added to a base with an unknown concentration (or vice versa). A few drops of indicator solution are added to the base. The indicator will signal, by color change, when the base has been neutralizedExplanation:
why is fruit cake a heterogeneous mixture ??
You have a 150mL sample of an aqueous solution at 25C. It contains 15.2mg of an unknown nonelectrolyte compound. If the solution has an osmotic pressure of 8.44 torr, what is the molar mass of the compound
The molar mass of the compound:
If the solution has an osmotic pressure of 8.44 torr, then the molar mass of the unknown non-electrolyte is 223.14 g.
What is osmosis?
Osmosis is defined as the flow of solvent molecules through semi-permeable membrane.Osmotic pressure is the pressure applied to stop the flow of solvent molecules.It is a colligative property that means osmotic pressure depends on the number of solute particles .Therefore,
π[tex]V=inRT[/tex] ( for electrolytes)
Where, π= Osmotic pressure
i = Van 't Hoff factor
n= moles
R= Gaseous constant = 62.363577 L torr [tex]mol^{-1}K^{-1}[/tex]
T= Temperature
V= Volume of solution
Given:
T= 298K
V= 150 mL= 0.150 L
Given mass of unknown electrolyte= 15.2 mg = 15.2 x [tex]10^{-3}[/tex] g
Osmotic pressure= 8.44 torr
Molar mass= ?
For non-electrolytes:
πV = n RT
πV=[tex]\frac{m}{M}[/tex]RT
Calculations:
Putting the given values in the formula:
8.44 x 0.150 =15.2 x [tex]10^{-3}[/tex]/ M x 62.36 x 298
1.266 = 282.5/M
M = 282.5/1.266
M = 223.14 g
Therefore,
The molar mass of the unknown non-electrolyte is 223.14g.
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Which law states that the volume of a gas is proportional to the moles of the gas when pressure and temperature are kept constant?
Boyle’s law
Dalton’s law
Charles’s law
Avogadro’s law
The law that states that the volume of a gas is proportional to the moles of the gas when pressure and temperature are kept constant is Avogadro’s law. That is option D.
What is Avogadro’s law?Avogadro’s law states that the volume of a gas is proportional to the moles of the gas when pressure and temperature are kept constant.
Mathematically the Avogadro’s law can be represented by the following:
V1/n1= V2/n1
Where,
V1 = first volume
n1 = first amount of gas
V2 = second volume
n2 = second amount of gas
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Answer:D
Explanation:Trust me bro