Question

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

Answer 1

Explanation:

a=100 ,a-x=100-75=25

t=32min

because

T1/2=t50%

so

k=2.303/32log10(100/25)

=2.303/32 log10(4)

=2.303/32 (2log10*2)

=2.303/32(2×.3010)

2.303/32(.6020)

k=•04332

T1/2=•6932/•04333

T1/2=16 min

or

t50%= 16 min