Anonymous
Anonymous asked in Science & MathematicsChemistry · 1 month ago

Chem lab help please?

You work for a chemical company and have been tasked with synthesizing acetylsalicylic acid. Currently, your R&D group can achieve a 27% yield for acetylsalicylic acid using salicylic acid and acetic anhydride. Your R&D group has been sent 2.86 U.S. tons of salicylic acid and 127 gallons of acetic anhydride. How much acetylsalicylic acid (in kg) can actually be produced by your group?

1 kg = 2.205 lbs

1 gal = 3.79L

Write answer to four significant figures.

1 Answer

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  • 1 month ago

    Mass of salicylic acid = 2.86 tons  

    1 ton = 907185 g

    so mass of acid in g = 2.86 x 907185 = 2.5945 x 10^6 g

    Mol salicylic acid = mass / molar mass

    = 2.5945 x 106 g / 138.12 g/mol = 18784.7 mol

    volume acetic anhydride = 127 gal = 4.8075x 10^5 mL

    density acetic anhydride = 1.08 g/cm3

    mass of acetic anhydride = density x volume

    = 1.08 g/cm3 x 4.8075 x 10^5 mL

    = 5.1921 x 10^5 g

    mol acetic anhydride = 5.1921 x 10^5 g / 102.09 g/mol = 5085.8 mol

    acetic anhydride is present in lesser amounts , so it is the limiting reactant

    Number of mol of acetyl salicylic acid formed will be = 5085.8 mol

    Theoretical yield = mol x molar mass

    = 5085.8 mol x 180.16 g/mol

    = 916253.8 g

    = 916.25 kg

    Now since percent yield = 55%

    so actual yield = ( 55 x 2165 kg) / 100

    = 1191 kg = 2626.155 Lbs

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