What is the percent yield of a reaction using 10 moles of ac

What is the percent yield of a reaction using 10 moles of acetone and 16 moles of benzaldehyde and obtains 6 moles of dibenzalacetone?

Solution

1 mole of acetone reacts with 2 moles of benzaldehyde, so benzaldehyde is the limiting reagent here.
16 moles of benzaldehyde should yield 8 moles of dba. So the percent yield is 6/8 = 75%.