C4.4 The Yield of a Chemical reaction Flashcards
1
Q
Why do very few chemical reactions have a yield of 100%?
A
➢The reaction may be reversible - as products form they react to re-from the reactants again
➢Reactants may not be pure
➢Some of the product may be lost in handling or left in the apparatus
➢Some reactants may react to give unexpected or unwanted products
2
Q
What is the yield?
A
➢The mass of the product that a chemical reaction produces
3
Q
What is the formula for the percentage yield?
A
➢ Percentage yield = actual mass / maximum theoretical mass possible x 100%
