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Discussion in 'MCAT Study Question Q&A' started by Oh_Gee, Sep 7, 2014.
will the reactant with less moles always be the LR? do the coefficients of the reactants matter?
The substrate that is used up first.
So it depend on coefficients.
For example, 10A + B -----> A10B
If there are 10 moles of A and 5 moles of B, the LR will be A even though it has more moles.
The reaction will use 10 moles of A and only 1 of B, leaving 4 moles of B.
so if you were given grams of A and B and you calculated that you have 1 mol A and 3 mols B, A would still be the LR? and .1 mols of A10B will be made?
You can calculate your moles and then use dimensional analysis to check for the limiting reagent.
Given 1 mol A and 3 mol B
1 mol A * (1 mol A10B/10 mol A) = .1 mol A10B
3 mol B * (1 mol A10B/1 mol B) = 3 mol B
You can only go as far as your weakest link!
So then we can say that a reaction creating .1 mol A10B * (1 mol B/1 mol A10B) = .1 mol B will be used
So we started with 3 mol B and used .1 mol B = 2.9 mol B remaining.