percentage yield Flashcards
1
Q
what is percentage yield?
A
a measure of the efficiency of converting reactants into products
2
Q
define yield
A
the mass of a product obtained from a reaction
3
Q
percentage yield formula
A
(actual/theoretical)x100
can use mass or moles
4
Q
why are 100% yields rarely obtained?
A
-reaction may be incomplete
-may be reversible so reaches equillibrium
-reactants may be impure leading to side reactions so by products
-some may be lost when peparing and purifying
