Conversion
Stoich
Moles to Quantity
• Moles of 1 substance are
given and you are asked to
find the mass, concentration
or volume of another
Example
• Copper metal reacts with an aqueous
solution of silver nitrate to produce silver
metal and copper (II) nitrate. What mass
of silver can be produced by reacting
0.250mol of copper?
Step 1: Write a balanced
equation for the reaction
Cu(s) + 2AgNO3(aq)  Cu(NO3)2(aq) + 2Ag(s)
Step 2: Determine the given
and unknown
• Given: 0.250mol of Cu(s)
• Unknown: #g of Ag(s)
Step 3: Set up the mole ratio
and change moles to grams
#g of Ag(s) = 0.250mol Cu(s) x 2Ag x 107.87g
1Cu
#g = 53.9g of Ag was produced
mol
Example 2
• Sulfuric acid is neutralized by sodium
hydroxide solution. What mass of sodium
sulfate can be produced by reacting
0.350mol of NaOH(aq)?
H2SO4(aq) + 2NaOH(aq)  Na2SO4(aq) + 2H2O(l)
#g of Na2SO4 = 0.350mol NaOH x 1Na2SO4 x 142.05g
1NaOH
#g of Na2SO4 = 24.9 grams
mol
Example 3
• When sulfuric acid reacts with sodium
hydroxide, sodium sulfate and water are
produced. If 40.00mL of H2SO4(aq) reacts
with 0.150mol of NaOH, what is the
concentration of the acid?
H2SO4(aq) + 2NaOH(aq)  2H2O(l) + 1Na2SO4(aq)
mol = 0.150mol NaOH x 1Na2SO4 x
L
mol/L Na2SO4 = 1.875M
2NaOH
1
0.040L Na2SO4
Quantity to Moles
• The quantity of one
substance such as mass,
volume or concentration is
given and you are asked to
find the moles of another
Example
• How many moles of water vapor can be
produced by reacting 78.4L of oxygen gas at
STP with sufficient hydrogen gas?
• *** remember you must get it to moles to do
the mole ratio***
2H2(g) + O2(g)  2H2O(g)
#mol of H2O = 78.4L O2 x mol x 2H2O
22.4L
#mol of H2O = 7.00mol of H2O
1O2
Example 2
• How many moles of zinc are needed to
produce 450.00g of zinc chloride by reacting
the zinc with an excess of hydrochloric acid?
Zn(s) + 2HCl(aq)  ZnCl2(aq) + H2(g)
#mol Zn = 450g ZnCl2 x
mol
136.28g
#mol Zn = 3.302mol of Zn
x
1Zn
1ZnCl2
Example 3:
• If solid sodium chloride is reacted with 26.9mL
of 3.00M H2SO4(aq), aqueous solutions of
hydrochloric acid and sodium sulfate are formed.
How many moles of sodium sulfate are formed?
2NaCl(s) + H2SO4(aq)  2HCl(aq) + Na2SO4(aq)
#mol Na2SO4 = 3.00mol x 26.9L x 1 Na2SO4
L
#mol Na2SO4 = 80.7mol
1H2SO4