( ( Theoretical yield ) ( ( is ( ( the amount ) ( of ( product ( predicted ( by ( the ( chemical equation ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Theoretical) (NN yield)) (VP (VBZ is) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NP (NN product)) (VP (VBN predicted) (PP (IN by) (NP (DT the) (NN chemical) (NN equation)))))))) (. .)))
Theoretical yield is the amount of product predicted by the chemical equation.
(ROOT (S (NP (NP (DT The) (NN amount)) (PP (IN of) (NP (NP (NN product)) (SBAR (WHNP (WDT that)) (S (VP (MD may) (VP (VB be) (VP (VBN produced) (PP (IN by) (NP (DT a) (NN reaction))) (PP (IN under) (NP (VBN specified) (NNS conditions))))))))))) (VP (VBZ is) (VP (VBN called) (NP (JJ theoretical) (NN yield)))) (. .)))
The amount of product that may be produced by a reaction under specified conditions is called theoretical yield.