State the 3C approach.
Convert to moles (from what qns gives)
Compare mole ratio (between what is given and what you want to find)
Convert from moles (to what qns wants).
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State the feature of a limiting/ excess qns and approach to solving it.
feature | amount (mass/ mole/ volume) of both reactants are given in qns
approach |
(1) find moles of both reactants
(2) select any one reactant (A); use mole ratio to find the mole of the other reactant (B) needed.
(3) if no. of moles of (B) needed > no. of moles (B) present → (B) is limiting
if no. of moles of (B) needed < no. of moles (B) present → (B) is in excess
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