# (a) What mass of acetic anhydride is needed to completely consume 2.60 102 g salicylic acid?

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AP Chemistry
Aspirin (C9H8O4) is synthesized by reacting salicylic acid (C7H6O3) with acetic anhydride (C4H6O3). The balanced equation is given below. C7H6O3 + C4H6O3 C9H8O4 + HC2H3O2 (a) What mass of acetic anhydride is needed to completely consume 4.40 102 g salicylic acid? What is the ...

Chemestry
Aspirin (C9H8O4) is synthesized by reacting salicylic acid (C7H6O3) with acetic anhydride (C4H6O3). The balanced equation is given below. C7H6O3 + C4H6O3 C9H8O4 + HC2H3O2 (a) What mass of acetic anhydride is needed to completely consume 4.20 102 g salicylic acid? g (b) What is...

chemistry
Aspirin (C9H8O4) is synthesized by reacting salicylic acid (C7H6O3) with acetic anhydride (C4H6O3). The balanced equation is given below. C7H6O3 + C4H6O3 C9H8O4 + HC2H3O2 What mass of acetic anhydride is needed to completely consume 3.60 x 10^2 g salicylic acid? i worked out ...

Chemisty
How to calculate the theoretical yield of aspirin to be obtained when 2.0 g of salicylic acid and 5.0 mL of acetic anhydride (density = 1.08 g/mL) are mixed together? ( Molar masses: acetic anhydride = 102.1 g/mol; salicylic acid = 138.2 g/mol)

chemistry
For the theoretical yield, I used the mass of acetic anhydride. Was I supposed to use the mass of salicylic acid (which was 2.00 g) instead? acetic anhydride + salicylic acid ---> acetic acid +acetylsalicylic acid

chemistry - synthesis of aspirin
This is an experiment for a synthesis of aspirin lab mass of salicylic acid = 2.005 g mass of acetic acid = ? moles of acetic acid = ? volume of acetic anhydride = 4 ml mass of acetic anhydride (Use 1.08 g/ml for the liquid density) = (1.08 g/ml) (4 ml) = 4.32 g moles of ...

Chemistry of Life Science
1. In the introduction to this experiment, it states that you reacted 2.5 grams of salicylic acid with an excess of acetic anhydride, meaning that there would be a higher number of moles of acetic anhydride then salicylic acid, proportionally. Assuming the density of acetic ...

chem
A chemist is commissioned to produce twenty pallets of aspirin: C7H6O3 (salicylic acid) + C4H6O3 (acetic anhydride) → C9H8O4 (aspirin) +C2H4O2 (acetic acid) Given a bottle contains 500 tablets (each containing 325 mg of aspirin). A case contains 144 bottles. A pallet ...

chem
Aspirin, C9H8O4, is produced from salicylic acid, C7H6O3, and acetic anhydride, C4H6O3: C7H6O3 + C4H6O3 --> C9H8O4 + HC2H3O2 a. How much salicylic acid is required to produce 1.5 x 10^2 kg of aspirin, assuming that all of the salicylic acid is converted to aspirin? b. how ...

CHEM HELP
I asked this already but for some reason the answer I got isnt being accepted online Question: In the laboratory, 3.50 grams of salicylic acid were reacted with 7.20 ml of acetic anhydride (density equal to 1.08 g/ml). Determine the limiting reagent. I did: salicylic acid + ...

chemistry - synthesis of aspirin
wanted to calculate the theoretical and actual yield of aspirin. mass of salicylic acid = 2.005 g But isn't salicylic acid differ. from acetic acid? If so, how do we find the mass of acetic acid in this experiment volume of acetic anhydride = 4 ml mass of acetic anhydride (use...

chemistry - synthesis of aspirin
I wanted to calculate the theoretical and actual yield of aspirin. mass of salicylic acid = 2.005 g But isn't salicylic acid differ. from acetic acid? If so, how do we find the mass of acetic acid in this experiment volume of acetic anhydride = 4 ml mass of acetic anhydride (...

Chemistry
Aspirin, C9H8O4 , is produced through the following reaction of salicylic acid, C7H6O3, and acetic anhydride, C4H6O3: C7H6O3(s) + C4H6O3(l) ---> C9H8O4(s) + HC2H3O2(l) A. What mass of aspirin (kg) could be produced from 75.0 mol of salicylic acid? B. What mass of acetic ...

Chemistry
Aspirin is prepared by heating salicylic acid, C7H6O3, with acetic anhydride, C4H603. The other product produced is acetic acid, C2H402. C7H6O3+C4H6)3->C9H8O4+C2H4O2 What is the theoretical yield in grams of aspirin, C9H8O4, when 2.00 grams of salicylic acid is heated with ...

Aspirin (C9H8O4) is produced from salicylic acid (C7H6O3), and acetic anhydride (C4H6O3): C7H6O3 + C4H6O3 ¨ C9H8O4 + HC2H3O2 How much salicylic acid is required to produce 2.0 102 kg of aspirin, assuming that all of the salicylic acid is converted to aspirin? for this one i...

Chemistry
Two people were given 1.75 g salicylic acid and 2.00 mL of acetic anhydride. If the density of acetic anhydride is 1.0820 g/mL, how many grams of aspirin could they have prepared. Is the answer 4.7 g

Chemistry
How many grams of acetic anhydride are needed to react with 3.82g of salicylic acid?

chem
Aspirin (C9H8O4) is produced from salicylic acid (C7H6O3), and acetic anhydride (C4H6O3): C7H6O3 + C4H6O3 ¨ C9H8O4 + HC2H3O2 . (c) What is the theoretical yield of aspirin if 189 kg of salicylic acid is allowed to react with 128 kg of acetic anhydride? (d) If the situation ...

Chem
A student reacts 57g of salicylic acid with 21 mL of acetic anhydride producing 10.5g of acetyl salicylic acid. What is the percent yield of the reaction?

chemistry (Pls Bob check for me)
Aspirin c9h8oh molar mass = 180.1g/mol can be prepared by the reaction of salicylic acid c7h603 molar mass = 13801 g/mol with acetic anhydride c6h603, according to the following equation. A chemist starts with 2 gram of salicylic acid reacts it with excess acetic anhydrate, ...

Chemistry
Aspirin can be prepared in the chemistry laboratory by the reaction of salicylic acid with acetic anhydride. What volume of acetic anhydride is required to produce one killogram of aspirin assuming 100%yield

chemistry
Asprin, C9H8O4, is prepared by reacting salicylic acid, C7H6O3, with acetic anhydride, C4H6O3, in the reaction C7H6O3(s) + C4H6O3(l) -> C9H8O4(s) + C2H4O2(l) A student is told to prepare 45.0 g of aspirin. She is also told to use a 55.0% excess of the acetic anhydride and ...

first chemistry
Salicylic acid reacts with acetic anhydride to produce the analgesic drug aspirin and acetic acid. Using a periodic table, calculate the molecular weight of aspirin to 2 decimal places.

chemistry
if 1.5g of salicylic acid is heated with an excess of acetic anhydride, what is the theoretical yield of acetylsalicylic acid?

Chemistry
Calculate the theoretical yield of aspirin to be obtained in this experiment, starting with 2.0 g of salicylic acid and 5.0 ml of acetic acid anhydride (density = 1.08 g/ml).

chemistry
given the density of acetic anhydride to be 1.05 g/mL, what was the mass of the acetic anhydride added to the reaction? How many moles of acetic acid were added?

Chemistry
What is the theoretical yield of aspirin if you have 2g of salicylic acid and 5 ml acetic anhydride?

organic chem
moles are in 1.30 mL of acetic anhydride given that the density of acetic anhydride is 1.08 g/mL and the molecular weight is 102 g/mol?

chemistry lab
if you find salicylic acid or acetic anhydride in your aspirin synthesis product why are they there? Where did they come from?

chemistry
Calculate the number of moles in each of the following: 0.150 g of salicylic acid 0.30 mL of acetic anhydride (density = 1.08 g/mL)

chemistry
What is the formula for predicting the grams of Aspirin produced from reacting Salicylic Acid and Acetic Anhydride?

chemistry
What is the formula for predicting the grams of Aspirin produced from reacting Salicylic Acid and Acetic Anhydride?

science
asprin (C9 H8 O4) is produced by the rection between salicylic acid (C7 H6 O3) and acetic anhydride(C4 H6 O3). Calculate the maximum mass of aspirin that can be obtained if you mix 50g of each of the reactants. The chem.equation for the reaction is as f.f C7 H6 O3(s) + C4 H6 ...

Chemistry
Asprin C9H8O4 is made by the reaction of salicylic acid C7H6O3 and acetic anhydride C4H6O3. The other product in the reaction is acetic acid HC2H3O2. How many of each reactant should be used to produce 75.0g of asprin. Assume that the reaction gives a 68.2% yield.

Chemistry
If 2 g of salicylic acid is heated with 4 g of acetic anhydride, what is the theoretical yield ? C7H6O3 + C4H6O3 --> C9H8O4 + C2H4O3

Chemistry
Explain how conc. H2so4 catalysis the speed of the reaction between salicylic acid and acetic anhydride.

Chemistry
Asprin(acteyl salicylic acid) can be synthesized by reacting acetic anhydride with salicylic acid. Assume the reaction was run and 1.75 grams of a solid product was obtained. Recrystalization of the 1.75 g mixture yielded 1.50 g of asprin. a. What was the percentage recovery ...

Chem Lab
Aspirin synthesis and Analysis: Calculate theoretical yield of ASA? Used 3.5mL of acetic anhydride and 1.5g of salicylic acid.

In the laboratory, 3.50 grams of salicylic acid were reacted with 7.20 ml of acetic anhydride (density equal to 1.08 g/ml). Determine the limiting reagent. Calculate the theoretical yield of the product, acetylsalicylic acid (ASA), produced in the above reaction.

chemistry
Assume you used 0.200g of salicylic acid and 0.480mL of acetic anhydride, and you obtain 0.152g of pure, recrystallized, dry aspirin. Calculate the percent yield.

chem
if you were to react 14.00 grams of salicylic acid with 8.50 grams of acetic anhydride, what would your theoretical yield be? the reaction is C7H6O3+C4H6O3--> C9H8O4 + C2H4O2 assuming 1:1 ratio.

Chemistry
If 0.150 moles of salicylic acid and execs acetic anhydride are used during a synthesis of aspirin, how many grams of aspirin will be obtained if the reaction gives a 38% yield?

chemistry
ok so you have 1.76g of salicyic acid(138.12 g/mol) and with 1.11 g of acetic anhydride(102.10 g/mol) a student obtained 1.12g of acetylsalicylic acid( 180.17 g/mol) what is the percentage yield?

Chemistry
ASpirin, c9h8o4, is prepared by reating salicylic acid, c7h6o3, with acetic anhydride, c4h6o3, in the reaction. c7h6o3 + c4h6o3---> c9h8o4 + c2h4o2 A student is told to prepare 45.0 g of aspirin. she is also told to use a 55.0 % excess of acetic anhydride and to expect to ...

chemistry
Given 20g of benzoic acid contaminated with 0.4g of salicytic acid. 1)Determine the volume of hot water required to dissolve the mass of acid. 2)Calculate the mass of benzoic acid which participates when the solution is cooled to 20°C. Deduce. 3)Calculate the mass of ...

Chemistry
In this experiment NaOH is standardized to find out the percent by mass of the acetic acid in a sample of vinegar. A student had not allowed the NaOH pellets to dissolve completely before standardizing it with KHP, but when the student refilled the buret with NaOH to titrate ...

Chemistry
Aspirin (C9H8O4) is synthesized by the reaction of salicylic acid (C7H6O3) with acetic anhydride, C4H6O3. 2C7H6O3 + C4H6O3 −→ 2C9H8O4 + H2O When 19 g of C7H6O3 and 19 g of C4H6O3 react, which is the limiting reagent?

Chemistry
A chemist wants to be a supercook and wants to create 8%(m/v) acetic acud solution to be "extra strength" vinegar. if pure acetic acid Is a liquid density of 1.049 g/ml. how many ml of acetic acid should be dissolved to male 500 ml of 8% acetic acid? Calculate grams of acetic ...

organic chemistry
How to find the volume of hot water required to dissolve the mass of acid, if we have 20g of benzoic acid contaminated with 0.4g of salicylic acid? What is the mass of benzoic acid which participates when the solution is cooled to 20°C? Deduce. What is the mass of salicylic ...

Organic Chemistry
An impure sample contains 0.95g of benzoic acid and 0.05 of salicylic acid. Solubilities in water of the two compounds are given in the following table. Solubility at 20 degrees (g/10mL) benzoic acid: 0.029 salicylic acid: 0.22 Solubility at 100 degrees (g/10mL) benzoic acid: ...

OChem
Suppose a student obtained a 0.15g of cruse salicylic acid. How much water would be needed to just dissolve it at 75 degrees Celsius? How much salicylic acid would remain dissolved in that amount of water at just 10 degrees Celsius? What percent of the original mass of the ...

chemistry
Calculate the volume of 1.00 M acetic acid solution and mass of sodium acetate needed to make 250 mL of a 0.450 M acetic acid/acetate buffer solution with a pH of 4.00. (The pKa is 4.74 for acetic acid).

Chemistry
Calculate the volume of 1.00 M acetic acid solution and mass of sodium acetate needed to make 250 mL of a 0.450 M acetic acid/acetate buffer solution with a pH of 4.00. (The pKa is 4.74 for acetic acid) *Please explain it in detail, don't leave a step out! Thank You!

Chemistry
1)A buffer solution that is 0.10 M sodium acetate and 0.20 M acetic acid is prepared. Calculate the initial pH of this solution. The Ka for CH3COOH is 1.8 x 10-5 M. As usual, report pH to 2 decimal places. *A buffered solution resists a change in pH.* 2)Calculate the pH when ...

Chemistry
1)A buffer solution that is 0.10 M sodium acetate and 0.20 M acetic acid is prepared. Calculate the initial pH of this solution. The Ka for CH3COOH is 1.8 x 10-5 M. As usual, report pH to 2 decimal places. *A buffered solution resists a change in pH.* 2)Calculate the pH when ...

Chem
Please tell me if these are right! 1.How many milliliters of 0.215 M NaOH solution are needed to completely neutralize 2.50 ml of 0.825 M H2SO4 solution? I got 19.2 ml 2. A 10.0-ml sample of vinegar which is an aqueous solution of acetic acid HC2G3O2 requires 16.5 ml of 0.500M...

chemistry
I need some help with calculating percent yield and percent purity of aspirin. Here's my data (questions follow): SYNTHESIS Mass of salicylic acid.., 2.0 g Volume of acetic anhydride.., 5 mL Mass of watch glass.., 22.10 g Mass of aspirin and watch glass.., 28.01 g Mass of ...

Chemistry
The chemical reaction of 100 g of salicylic acid, C7H6O3, with excess acetic anhydride produces 50.0 g of aspirin, C9H8O4, according to the equation. What is the percentage yield for the reaction shown below? Please show your work. C7H6O3 + C4H6O3 → C9H8O4 + C2H4O2

Chemistry
The chemical reaction of 100 g of salicylic acid, C7H6O3, with excess acetic anhydride produces 50.0 g of aspirin, C9H8O4, according to the equation. What is the percentage yield for the reaction shown below? Please show your work. C7H6O3+C4H6O3→C9H8O4+C2H4O2

chemistry
Is it possible to make acetic anhydride from acetic acid/glacial?

Chemistry
I was heating a flask containing salicylic acid, acetic anhydride, and H2SO4 to synthesize aspirin. During the heating period, a black sludge appeared at the bottom of the flask. I have no idea what this could be. Other students had experiments that worked just fine so there ...

chemistry
Can somebody point out the step i have to take to solve this problem. It would be much appreciated. Thanks a lot!!!! _____________________________________________________________________________________________________________________ Asprin, C9H8O4, is prepared by reacting ...

chemistry
A solution is 40% acetic acid by mass. The density of this solution is 1.049 g/mL. Calculate the mass of pure acetic acid in 170 mL of this solution at 20 C. Answer in units of g The density of a solution of sulfuric acid is 1.29 g/cm3 and it is 38.1% acid by mass. What volume...

Chemistry help!!
A chemist wants to be a supercook and wants to create 8%(m/v) acetic acud solution to be "extra strength" vinegar. if pure acetic acid Is a liquid density of 1.049 g/ml. how many ml of acetic acid should be dissolved to male 500 ml of 8% acetic acid? It says to first calculate...

Chemistry
Ok, in this question, the drops is throwing me off totally, can someone help! A nationally known company markets a product called "cleaning vinegar" that is not designed for human consumption. What is the mass percent of acetic acid in this product if 25 drops of .683M NaOH ...

chemistry
You want to make an acetic acid/acetate buffer, pH 3.8, with a volume of 250 mL, and a final concentration of ([AcOH] + [AcO-]) = 0.1 M. You may only use acetic acid and sodium acetate (no strong acid or base). How many mL of glacial acetic acid would be needed (d = 1.05 g/mL)?

Chemistry
Asprin, c9h804, is produced through the following reaction of salicyclic acid, c7h6o3, and acetic anhydride, c4h6o3. chemical equation: c7h6o3 + c4h6o3 yields c9h8o4 + hc2h3o2 (all numbers in this equation are subscripts) At 20 degrees Celsius. how many liters of acetic acid, ...

Organic Chemistry
An impure sample contains 0.95g of benzoic acid and 0.05 of salicylic acid. Solubilities in water of the two compounds are given in the following table. Solubility at 20 degrees (g/10mL) benzoic acid: 0.029 salicylic acid: 0.22 Solubility at 100 degrees (g/10mL) benzoic acid: ...

chem-acid-base titrations
Acetic acid (HC2H3O2) is an important component of vinegar. A 10.00mL sample of vinegar is titrated with .5052 M NaOH, and 16.88 mL are required to neutralize the acetic acid that is present. a.write a balanced equation for this neutralization reaction b.what is the molarity ...

chemistry
Prepare 500mL of a 0.200 M acetate buffer at pH 4.90 using only pure acetic acid, 3M NaOH, and water. 1) Add acetic acid to ~400mL of water in a 500 mL beaker. How many grams of acetic acid are needed? 2)Add 3 M NaOH solution until pH is 4.90. What volume of NaOH is needed? (...

Calculate the mass percent of acetic acid in acetic acid solution. Average molarity= .8806753M Average density= 3.27463 Molar mass of acetic acid= 60.042g

O-Chem
Find the minimum volume of hot water needed to dissolve 100 mg of salicylic acid. Can someone help me how to start this out? I would greatly appreciate it. The data is [temp] [amount of salicylic acid per 100 ml water, g] 0 0.10 10 0.13 25 0.23 50 0.63 75 1.8 90 3.7

chemistry
Show the calculation of (1) the expected grams of aspirin (C9H8O4) formed in the reaction of 2.7 grams of salicylic acid (C7H6O3) with excess acetic anhydride and then show the calculation of (2) the % yield if the actual yield of aspirin is 1.44 grams. Reaction is shown below:

chemistry
1. When performing this experiment, a student mistakenly used impure KHP to standardize the NaOH solution. If the impurity is neither acidic nor basic, will the percent by mass of acetic acid in the vinegar solution determined by the student be too high or too low? Justify ...

O Chemistry
In the reaction p-aminophenol + acetic anhydride --> acetaminophen , 4.5 ml of water is added into the flask with the p-aminophenol and acetic anhydride at the beginning of the experiment. What is the purpose of this water?

chemistry
If you used 0.155 mL of acetic anhydride, and 0.169 g of p-aminophenol what was the limiting reagent? Choice is either: 1. acetic anhydride or 2. p-aminophenol ________mol? How many moles of the non-limiting reageant remained after the reaction was complete?

chemistry
If you use 1 gram of salacylic acid and 3ml of acetic anhydride & 3 drops of phosphoric acid and 1 ml of water after boiling = 0.55 g of aspirin. What is the % yield?

chemistry
A student weighed out 1.5g of salicylic acid into a flask and then added 4ml of acetic an hydride to react. He also added 5 drops of concentrated sulfuric acid. Density of acetic an hydride is 1.08g/ml and sulfuric acid is 1.85g/ml (sulfuric acid is a catalyst in this reaction...

Chemistry
We did a titration lab, and one of the post-lab questions says: "the manufacturer of the vinegar used in this experiment claims that the vinegar contains 5% acetic acid by weight. Use your results and a density of 1g/mL to determine if this claim is true or false. So the ...

Chemistry
We did a titration lab, and one of the post-lab questions says: "the manufacturer of the vinegar used in this experiment claims that the vinegar contains 5% acetic acid by weight. Use your results and a density of 1g/mL to determine if this claim is true or false. So the ...

chemistry II
What is the molarity of a solution of acetic acid if 35.00mL is titrated to the end point with 68.20ml of 0.750M KOH? What is the percentage by mass of acetic acid solution? The density of acetic acid is 1.06 g/ml

Chemistry
Aspirin can be prepared by the reaction of salicylic acid with an excess of acetic anhydride, using phosphoric acid as a catalyst. Once the aspirin is formed, it is precipitated from the reaction mixture by adding water and filtering. The solid aspirin obtained in this way is ...

Chemistry
What is the concentration of an acetic acid solution if 11.2 mL of 1.002 Molarity sodium hydroxide solution is needed to completely neutralize 5.1 mL of the acid?

Chem
In making the ester methyl salicylate, mathanol is reacted with salicylic acid. If 2 grams of salicylic acid is reacted with excess methanol, what mass of ester would you expect to achieve theoretically.. show work

chem.
A 10.0 mL of vinegar, an aqueous solution of acetic acid (HC2H3O2), is titrated with .5062M NaOH, and 16.58mL is required to reach the equivalence point. A. What is the molarity of the acetic acid? B. If the density of the vinegar is 1.006 g/cm^3, what is the mass percent of ...

chemistry
10 ml sample of vinegar an aqueous solution 0f acetic acid( HC2H3O2) is titrated with 0.5062 M and 16.58 ml is required to reach equivalence point what is the molarity of the acetic acid b. if the density of vinegar is 1.006 g/cm3 what is the mass percent of acetic acid of ...

Biochem
calculate the volumes of 0.10 M acetic acid and 0.20 M sodium acetate that are needed to prepare 48-mL buffer solution with pH = 3.70. Ka for acetic acid is 1.75 x 10-5

chemistry
calculate the volume of 17 M concentrated acetic acid solution that is needed to prepare 100 cubic centimeter of 1 M acetic acid?

chemistry
calculate the volume of 17 M concentrated acetic acid solution that is needed to prepare 100 cubic centimeter of 1 M acetic acid?

MATH
Calculate the amount of 8% acetic acid needed to combine with water to make 600 ml of 3.5% acetic acid.

chem
i am trying to find the minimum volume of hot water needed to dissolve 100 mg of salicylic acid. when i did the calculations i got 100 ml of hot water is this correct?? The data is [temp] [amount of salicylic acid per 100 ml water, g] 0 0.10 10 0.13 25 0.23 50 0.63 75 1.8 90 3.7

chem
i am trying to find the minimum volume of hot water needed to dissolve 100 mg of salicylic acid. when i did the calculations i got 100 ml of hot water is this correct?? The data is [temp] [amount of salicylic acid per 100 ml water, g] 0 0.10 10 0.13 25 0.23 50 0.63 75 1.8 90 3.7

chemistry
. How many mL of acetic anhydride (D= 1.082 g/mL) would be needed as starting material to produce 45.0 g of aspirin

Chemistry
In the titration of 14.0 mL of 0.10M acetic acid with 0.40 M NaOH, (A) How many mL of NaOH needed to completely neutralize the acid? Given the balanced equation: CH3COOH (aq) + NaOH (aq) 􏰀 CH3COO Na (aq) + H2O

chemistry
The complete combustion of salicylic acid releases 21.90 kJ of energy per gram of salicylic acid. In a particular bomb calorimeter (initially at room temperature), the combustion of 0.1182 g of salicylic acid, in the presence of excess oxygen, causes the temperature of the ...

chemistry
The complete combustion of salicylic acid releases 21.90 kJ of energy per gram of salicylic acid. In a particular bomb calorimeter (initially at room temperature), the combustion of 0.1182 g of salicylic acid, in the presence of excess oxygen, causes the temperature of the ...

chemistry
A certain vinegar is 5.0% acetic acid in water. What mass (in grams) of acetic acid is needed to mix with 185 grams of water to prepare this vinegar?

Chemistry
A salicyclic acid (MW= 138.123 g/mol) solution has a pH of 2.43. When 100 ml of this solution was evaporated 0.22g of dry salicylic acid was recovered. What is the Ka of salicylic acid?

Chemistry
A salicyclic acid (MW= 138.123 g/mol) solution has a pH of 2.43. When 100 ml of this solution was evaporated 0.22g of dry salicylic acid was recovered. What is the Ka of salicylic acid?

Chem
Dissolving 3g of ascorbic acid in 50g of acetic acid lowers the freezing point of acetic acid by 1.33degreesC. What is the molecular mass of ascorbic acid?

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