Percentage yield

Question 1

Why is 100% yield not always contained?

Answer 1

• Reaction may reach equilibrium and not go to completion
• Side reactants may occur, leading to by products
• Reactants may not be pure
• Residue may be left behind in apparatus
• Separation and purification may result in loss of some product

Question 2

What equation is used for percentage yield?

Answer 2

actual amount (in mol or g)/ theoretical amount (in mol or g) X 100