CHEM 11H Lecture 3: CHEM 11 Notes (09.29.17)
31 Oct 2017
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Some reactants are added in excess to ensure completion, especially when the reactant is cheap. When there is excess, there will be leftovers. One reactant will limit how much is produced. Limiting reactant (or limiting reagent) is the reactant that is consumed first. Water can be synthesized from hydrogen and oxygen gas according to this balanced equation: 2 h2 (g) + o2 2 h2o (g) Method #1: how much product if limiting reactant. H2 is the limiting reactant because there is less molecules produced (1000 < 4000) Method #2: pick one reactant and calculate how much of other reactant you"ll need. 2000 - 500 = 1500 molecules o2 left. The haber process (manufacture of ammonia from nitrogen and hydrogen) is as follow: Therefore, the limiting reactant is h2 because there is less moles of nh3. 5. 0 - 3. 0 = 2. 0 mol of n2 left: chemical plants work with large quantities in mass.
