1. LIMITING REAGENT EXAMPLES 9/27/11
1) IF 5 MOLES OF NITROGEN REACT WITH 2 MOLES OF HYDROGEN, WHAT IF ANYTHING IS A LIMITING REAGENT IN THE REACTION ? H2 (g) + N2 (g) --> 2 NH3(g)
( ) N2 H2
( )
( ) 1 3 5 2 = =
RATIO 2 GIVEN REACTANTS
THEORETICAL RATIO (COEFFICIENTS)
EXPERIMENTAL RATIO (COEFFICIENTS)
The theoretical ratio (0.33) is smaller than the experimental (2.5)
Therefore the numerator of the experimental is disproportionately large(excess reagent), and the denominator of the experimental is disproportionately small ( limiting reagent), hydrogen in this rx.

2. LIMITING REAGENT EXAMPLES 9/27/11
1) IF 0.2 MOLES OF NITROGEN REACT WITH 1 MOLE OF HYDROGEN, WHAT IF ANYTHING IS A LIMITING REAGENT IN THE REACTION ? H2 (g) + N2 (g) --> 2 NH3(g)
( ) N2 H2
( )
( ) 1 3 .2 1 = =
RATIO 2 GIVEN REACTANTS
THEORETICAL RATIO (COEFFICIENTS)
EXPERIMENTAL RATIO (COEFFICIENTS)
The theoretical ratio (0.33) is larger than the experimental (0.2)
Therefore the numerator of the experimental is disproportionately small(limiting reagent), and the denominator of the experimental is disproportionately large ( excess reagent), hydrogen in this rx.