limiting reactant?

Question

is the liimiting reactant always the reactant in the smallest number of moles?

Answer 1

The limiting reactant is not always the one present in the smallest number of moles. It depends on how many moles of each reactant are needed to carry the reaction to completion. If the reaction requires 1 mole of "A" and 5 moles of "B", but you only have 4 moles of "B", then "B" is the limiting reactant even though you have 4 times as much of it as you have of "A".

Answer 2

yes.

Let's say you want to make H20 and you have 10 H's and 10 O's.

10 H's / H2 = 5.

You can only make 5 H20 molecules, because you run out of H's before O's. Therefore, you guessed it, H is out limiting reactant.

Answer 3

2A + B ---> C
no of mole of A is 0.01, no of mole of B is 0.1
den, no of mole of B required if all A is used up = 0.01 divide by 2 = 0.005 moles
no of moles of B required < no of moles of B given
so B is in excess, therefore A is limiting reagent...
to find limiting reagent, u not only have to consider the no of moles each substance has, but also consider its mole ratio...

Answer 4

Its called stoichiometry. Learn it. then figure it out for yourself.