Chapter 4

Question 1

Avogadro’s constant

Answer 1

6.02 x 10^23

Question 2

How to calculate the mass?

Answer 2

Mass= formula mass x moles

Question 3

What is the limiting reactant?

Answer 3

The reactant that is used up first and not left in excess

Question 4

What is the percentage yield?

Answer 4

The actual mass of product collected in a reaction divided by the maximum mass that could of been formed in theory multiplied by 10p

Question 5

How do calculate percentage yield?

Answer 5

Actual yield/theoretical yield x 100

Question 6

What are the factors affecting percentage yield?

Answer 6

The reaction may be reversible
Some reactants may give unexpected or unwanted products in alternative reactions
Some of the product may be lost in handling or left in the apparatus
The reactants may not be pure
Some of the desired product may be lost during its separation from the reaction mixture

Question 7

What is the equation for atom economy?

Answer 7

Relative formula mass of the desired product from equation/sum of the relative formula masses of the reactants from the equation x 100 %