Thank you for the opportunity to help you with your question!
for b: 2.05 x 102 Kg x 833.3= 174.2kg
for c: by calculation No# of mol we find that that acetic anhydrid is the limiting reactant so all calcutation depends on it
1 mol of acetic = 1 mol of aspirin ( from equation)
mole of acitic = 125000g / 102 g/mol = 1225,50 mol = mol of aspirin
mass of aspirin = 1.388x 180 = 220590g ( 250kg) and this is the theoretical yield
the pecentage yield = (actual / theoretical) x 100 %
= (182 kg / 250kg) x 100 = 72.8%
Please let me know if you need any clarification. I'm always happy to answer your questions.