Dimensional Analysis
Find the number of grams of NH3 produced by the
reaction of 5.40 g of hydrogen with excess
nitrogen. The balanced equation is
N2(g) + 3H2(g) à 2NH3(g)
5.40 g H2 1 mol H2 2 mol NH3 17.026 g NH3 =
2.016 g H2 3 mol H2 1 mol NH3
The Box Method
Stoichiometry Island Diagram
Stoichiometry Notecards
Front
Side:
Given
grams
Given
L
Converting to
moles
# g 1 mol
[m.m.] g
# L 1 mol
22.4 L
Given
# molec 1 mol
molecules
Mole
Ratio
Coeff Moles wanted
Coeff Moles given
6.02 x 1023 molec
Converting to
final quantity
Front
Side:
# mol [m.m.] g
1 mol
Want
grams
# mol 22.4 L
1 mol
# mol 6.02 x 1023 molec
1 mol
Want
L
Want
molecules