I think ionic hope it helps
Answer:
Explanation:
half life = 4 h
initial concentration = 100
final concentration = 15
Time = t
No of half life x = t / 4
15 = 100 x ( 1/2 )ˣ
.15 = ( 1/2 )ˣ
ln .15 = - x ln2
x = - ln .15 / ln 2
= 1.897 / .693
x = 2.737
x = t / 4
t = 2.737 x 4 = 11 h approx .
<span>The true ratio of atoms in a molecule or formula unit is called the molecular formula. This formula can show exactly how many and what types of atoms there are in a molecule, but it cannot show how they are arranged structurally. For example, the molecular formula for cyclopropane is C3H6. </span>
