3.4 reacting Quantities

Question 1

Define

stoichiometry

Answer 1

The stoichiometry represents the ratios the chemicals react in. This can be used to do
calculations. (stoichiometric ratio = multipliers in front of compounds).

Question 2

Formula for

pecentage yeild

Answer 2

actual yeild/theoretical x100

Question 3

Why is percentage yeild not 100%

Answer 3

• incomplete reaction
• other side reactions might of taken place
• purification process can result in loosing some product

Question 4

Define

Limiting reactant

Answer 4

the reactant that is not in excess will be completley used up first and stop the reaction

Question 5

percentage yeild and atom economy comparision

Answer 5

atom economy: we take into acount multipliers
percentage yeild: you need experimental values

Question 6

Formula for

atom economy

Answer 6

sum of mr of desired products/sum of mr of all products x100

Question 7

comment on sustainability in light of

atom economy

Answer 7

atom economy can be 100%

Question 8

Efficiency depends on both atom econmoy and % yeild

Answer 8

a particular reaction may have a high atom economy but poor percentage yeild