A first order reaction takes 40 min for 30 decomposition calculate its t1/2 value
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t1/2=77.7 approx.......
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t=2.303/k log (Ro)/(R)
=k=2.303/40 log (Ro)/(R)
=2.303/40 log 100/100-70
=2.303/40 log 10/7
=8.918 × 10^-3 min^-1
=t 1/2 = 0.693/k
=0.693/8.918×10^-3=77.7 minute (ans)
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