Question

a 14 gram sample of substance used to preserve fruit and vegetables has a k- value of 0.1095 find substance half-life in days round to the nearest tenth

Answer 1

t = 6.3 days

Explanation:

The amount of initial mass is irrelevant when finding the half-life since the remaining mass is always 1/2 of the initial mass.

`\frac { 1 } { 2 } = e ^ { ( - 0 . 1 0 9 2 t ) }`

Taking
`l n` on both the sides to get:

`ln \frac { 1 } { 2 } = -0.1092t`

`t = \frac { l n \frac { 1 } { 2 } } { -0.01092}`

`t = 6.3475`

t = 6.3 days