Respuesta :

Answer:

45000 μg/L

Step-by-step explanation:

Milligram  45mg/L = 45 × 10⁻³ g/L  = 0.045 g/L

Now into micrograms

As   micro is 10⁻⁶

So

     Milligram        Microgram

   45 mg/L      ⇒          45000 × 10⁻⁶ = 45000  μg/L