Anyone who knows how to calculate this?

Question

Anyone who knows how to calculate this?
Deadly dose Dioxin is 5 ppb.
How many can theoretically die of 500g Dioxin?
The average weight of a human being is set to 70kg.

Answer 1

Start with what you have and work to what you want.  The deadly dose would be 5g dioxin/1000000000g body mass.

 

500g dioxin x 1 human/70kg body mass x 1kg/1000g x 1000000000g body mass/5g dioxin= 1428571.4 humans.

 

So 500g dioxin could theoretically kill 1,428,571 people.