Question

Question #338a0

Answer 1

`6 125g=6.125*10^(-3)kg`

Explanation:

Formula is `m_l=m_s*0.5^(t/h)`, where:
`m_l` = mass left
`m_s` = starting mass
`t` = time
`h` = half life

Unit time for `h` and `t` must be the same.

So, we have `m_l=98*0.5^(80/20)`, where `80` and `20` are the same unit of time.

`80/20=4`

`98*0.5^4=6.125g`