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Question- Aldol condensation lab: 3-nitrobenzaldehyde (mw: 151.12; 0.154 g) + acetophenone (mw: 120.15; 0.12 mL) = (NaOH)= 3-nitrochalcone (253.25)

Before we crystallized using hot methanol and a craig tube, we weighed our crude and were supposed to find the theoretical yield. How would I go about this? The crude wasn't completely pure I'm guessing, and it weighed more (0.489 g) than the theoretical yield of 1:1 3-nitrobenzaldehyde to 3-nitrochalcone.

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