How do i figure out question 1. a 1. Aspirin can be made in a laboratory by reac

Question

How do i figure out question 1. a

1. Aspirin can be made in a laboratory by reacting acetic anhydride (C4H603) with salicylic acid (C7H603) to form aspírin (C9H804) and acetic acid. The balanced equation is: a) Ifyou began the synthesis with 3.00mL of acetic anhydride (density=1.08g/mL) and 1.25g of salicylic acid, determine the limiting reactant. b) Calculate the theoretical yield of aspirin in grams c) If you collect 1.22g of aspirin after the synthesis, determine the percent yield of the reaction. 2 Acomhustion reaction is the reaction of a carbon-hased molecule with oxvgen gas to produce

Explanation / Answer

a)

limiting reactant is the species which is finisehd first

mass of acetic anhydride = D*V = 3*1.08 = 3.24 g

mass of S. Acid = 1.25 g

change to moles

mol of AA = mass/KMW = 3.24/102.09 = 0.03173

mol of S.Acid = masS/MW = 1.25/138.121 = 0.00905

ratio is

1 mol of each is requierd to form 1 mol of Aspirin

therefore

Salycilic acid is limiting

0.00905 mol of S.Acid --> 0.00905 mol of aspirin

b)

yield

0.00905 mol of asipirin --> mass = mol*Mw = 0.00905*180 = 1.629 g of Aspirin

c)

m = 1.22 g

then

% yiield = real / theoretical *100% = 1.22/1.629 *100 = 74.89%

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