Stoichiometry and Stoichiometric Calculations

Question 1

Stoichiometry and Stoichiometric Calculations

Answer 1

Divided into 2 :-
1) Single Reactant Based
2) More than one reactant based

Question 2

Single Reactant Based

Answer 2

Divided into 3 types
1) Mass - Mass Relationship
2) Mass -Volume Relationship
3) Volume - Volume Relationship

Question 3

Mass - Mass Relationship

Answer 3

• Only when both reactants and products are related by mass

Question 4

Mass - Volume Relationship

Answer 4

• Only when reactant and product related with respect to mass and volume (or vice versa)

Question 5

Volume - Volume Relationship

Answer 5

• Only when both reactants and products are related by volume

Question 6

More than one reactant based

Answer 6

Divided into 2 :-
1) Limiting Reagent
2) Concentration Units in solutions

Question 7

Limiting Reagent

Answer 7

• Reactant which is completely used up in reaction
• Formula :-

Stoichiometric Co efficient

Question 8

Concentration Units in solutions

Answer 8

Expressed in four ways :_
1) Mass Percent
2) Mole Fraction
3) Molarity
4) Molality

Question 9

Mass Percent

Answer 9

Formula :-

(Mass of solute X 100)
/
Mass of solution

Question 10

Mole Fraction

Answer 10

• Ratio between moles of a substance and total no. of moles
• Formula :-
  Eg if 2 substance A and B present

Mole Fraction of A =
no. of moles of A
————————————————–
no. of moles of A X no. of moles of B

Question 11

Molarity

Answer 11

• No. of moles per litre of solution
• Denoted by M
• Formula :-
  No. of moles of solute
  ——————————————
  Volume of Solution

Question 12

Molality

Answer 12

• No. of moles per kg of solvent
• Denoted by m
• Formula :-

Mass of solvent (in kg)