•3H2(g)  +    N2(g) ------> 
 2NH3(g)  
 •
 •3 mol H2 (reactant)
 = 1 mol N2 (reactant) 
 consumed
 •3 mol H2 (reactant) = 
 2 mol NH3 (products) produced
 •1 mol N2 (reactant) = 2 mol NH3 (products) produced
 •3 x 2 (6) g H2 (reactant)
 = 1x 28  (28)mol N2 (reactant)  consumed
 •3 x 2 H2 (6) (reactant) =  2x 17 (34) NH3 (products) produced
 •1 x 28 (28) g N2 (reactant) = 2 x 17 (34) NH3 (products) produced