Stoichiometric calculations presntation

2. Objectives
Describe the types of relationships
indicated by a balanced chemical
equation.
Mole to mole conversion
Mole to mass conversion

3. Rally coach:
 Find all possible mole ratios for the following
equation:-
____ PbBr2 + ____ HCl  ____ HBr + ____ PbCl2

4. Stoichiometric mole-to-mole
conversion
 Reaction between potassium and water
 2K(s) + 2 H 2 O(l) → 2KOH(aq) + H 2 (g)
 Q1 : how much hydrogen is produced if only 0.0400
mol of potassium is used?
Known Unknown
K= 0.0400 mole H2 = ? moles

5. Known Unknown
K= 0.0400 mole H2 = ? moles

6.  Answer the following:
 For the following equation
C 3 H 8 (g) + O 2 (g) → C O 2 (g) + H 2 O(g)
How many moles of C O 2 are produced when 10.0 mol of
C 3 H 8 are burned in excess oxygen in a gas grill?
The answer:
 Balance the equations
 Follow the way shown above

7. So
C 3 H 8 (g) + 5 O 2 (g) → 3C O 2 (g) + 4 H 2 O(g)
Known Unknown
C 3 H 8 = 10.0 moles C O 2 = ? moles

9. Stoichiometric mole-to-mass
conversion
Determine the mass of sodium chloride
(NaCl), commonly called table salt,
produced when 1.25 mol of chlorine gas
( Cl 2 ) reacts with sodium

10. The answer :
1- Write the balanced chemical equation
2Na(s) + C l 2 (g) → 2NaCl(s)
2-
Now ,we have the moles of one substance and we
need the mass ( grams ) of anther substance
so ,
Known Unknown
1.25 mol Cl2 ? grams of NaCl
Known
mole
Unknown
mole
Unknown
grams

11. 3-known mole to unknown mole
4- unknown mole to unknown grams