In a first order reaction A---> B the ratio of molar concentration of A and B in the reaction mixture after 100 minute is 1:3. What would be the time needed from the start to have them in the ratio of 1:1?

1 Answer
Truong-Son N.
Mar 9, 2018

I don't see how this is even physically possible. If the mol ratio of #A# to #B# is #1:1#, and this reaction is irreversible AS-WRITTEN, you can never have more #B# than #A# unless #B# was manually added, or the reaction goes backwards...

If you really mean #3:1#, then the start of the reaction had a #4:0# "ratio", and #100# minutes later, #"1 mol"# of #A# reacts to make #"1 mol"# of #B#, giving #3:1#... Then #100# minutes later, #"1 mol"# of #A# reacts again to make #"1 mol"# of #B#, giving the #2:2# ratio.

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