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 195 lb (88.5 kg ) is 7.47×10−3 mol . What volume of a 0.0210 M KCN solution contains 7.47×10−3 mol of KCN?

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

The volume of KCN = 0.356 L

Molarity is a way to express the concentration of the solution

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

Where

M = Molarity

n = number of moles of solute

V = Volume of solution

mol of KCN = 7.47 x 10⁻³

Molarity of KCN = 0.0210 M

The volume :

V = n : M

V = 7.47 x 10⁻³ : 0.0210

V = 0.356 L

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