The radioactive decay of a certain sample produced 846 disintegrations per minute. exactly 3.00 days later, the rate of decay was found to be 269 disintegrations per minute. calculate the half-life, in days, for the decay of this sample.

Explanation:

1. Calculate the decay constant

The integrated rate law for radioactive decay is 1

where

A₀ and A_t are the counts at t = 0 and t

k is the radioactive decay constant

2. Calculate the half-life

The half-life for decay is .

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.