# Answer on Physical Chemistry Question for yelona

Question #11489

75percent of a first order reaction was completed in 32 minutes.when was 50percent of the reaction completed?

Expert's answer

v=

dC/dt.

v=const

v1=v2

v1=dC1/dt1

v2=dC2/dt2

dC1/dt1=dC2/dt2

(75)/32=(50)/x

2.34375=50/x

2.34375x=50

x=21.33

min

dC/dt.

v=const

v1=v2

v1=dC1/dt1

v2=dC2/dt2

dC1/dt1=dC2/dt2

(75)/32=(50)/x

2.34375=50/x

2.34375x=50

x=21.33

min

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