A 9 gram sample of a substance that's used for drug research has a K value of 0.1459

Find the substances half-life in days, and round answer to the nearest ten. (exponential decay)

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9 January, 09:02

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Aracely Liu · Answer 1

N = N0 e^ (-kt)

for half life N/N0 = 1/2 and k = 0.1459

1/2 = e^ (-0.1459t)

=> - 0.1459 t = ln (0.5)

t = - ln (0.5) / 0.1459

= 4.8 days

A 9 gram sample of a substance that's used for drug research has a K value of 0.1459Find the substances half-life in days, and round answer to the nearest ten. (exponential decay)