Question

The decomposition of a compound is found to follow first order rate law. If it takes 15 minutes for `20%` of original meterial to react, calculate the rate constant.

Answer 1

Given `t=15 min., a=100`
`a-x =100-20= 80`
`k=(2.303)/(t)log ""(a)/(a-X)`
`k=(2.303)/(15 )log ""(100)/(80) =0.1535 [2.000-1.9031]=0.1535xx0.0969`
`k=0.0148 min^(-1).`