Question

Potassium cyanide is a toxic substance, and the median lethal dose depends on the mass of the person or animal that ingests it. The median lethal dose of KCN for a person weighing 215 lb (97.5 kg ) is 8.84×10−3 mol .

What volume of a 0.0250 M KCN solution contains 8.84×10−3 mol of KCN?

Express the volume to three significant figures and include the appropriate units.

Answer 1

0.354L

Step-by-step explanation:

Given parameters:

Molarity of KCN = 0.025M

Number of moles = 8.84 x 10⁻³mol

Unknown:

Volume of KCN = ?

Solution:

The molarity of a substance is expressed as;

Molarity =
`(number of moles )/(volume )`

Volume of KCN =
`(number of moles )/(molarity)`

Now insert the parameters and solve;

Volume of KCN =
`(0.00884)/(0.025)` = 0.354L