Atom Economy/ Percentage Yield

Question 1

Equation for atom economy?

Answer 1

Molecular mass of desired product (from equation)/ sum of molecular masses of all reactants (from equation) x 100.
(FROM EQUATION: means include big numbers in front of molecules when calculating the mass.)
() - extra info for clarification.

Question 2

Why is a high atom economy in a reaction useful?

4 main reasons

Answer 2

• Less waste products
• Better for environment (less waste products released into the environment.)
• More sustainable (preserving raw materials.)
• Cheaper (less expensive disposal costs/

Question 3

How do you calculate percentage yield?

Answer 3

Actual yield/ theroticial yield x 100

Question 4

What is atom economy?

Answer 4

• Percentage value that indicates what percentage of the reactants atoms are used in the desired product.

Question 5

Exam Q

Importane of atom economy

Answer 5

• Minimises production of waste/** by** products.

Question 6

Percentage yield definition.

Answer 6

• A comparison between the theoretical yield that could be formed and the experimental yield actually formed.

Question 7

Exam Q

Importance of percentage yield

Answer 7

• You can get as much product as possible from the reaction.

Question 8

Give 2 reasons why percentage yield may not be 100% (assuming that the reaction fully reached completion/ there were no side reactions.)
GAS IS PRODUCED IN REACTION/ desired product is a SOLID.

Answer 8

• Some of the product is lost when weighing it.
• Solid blown away with gas produced.