Part A Potassium cyanide is a toxic substance, and the median lethal dose depend

Question

Part A

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 115 lb (52.2 kg ) is 6.01×10-3 mol . What volume of a 0.0680 M KCN solution contains 6.01×10-3mol of KCN? Express the volume to three significant figures and include the appropriate units.

Part B

Gastric acid pH can range from 1 to 4, and most of the acid is HCl.

For a sample of stomach acid that is 1.33×102M in HCl, how many moles of HCl are in 19.7 mL of the stomach acid?

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

Explanation / Answer

a.

Apply:

Molarity = mol/Volume

V = mol/M

V = (6.01*10^-3)/(0.068)  

V = 0.08838 L

V = 88.38 mL

V = 88.4 mL

B)

find mol of HCl for

V = 19.7 mL = 19,7*10^-3 L

mol = M*V

mol = (1.33*10^-2)(19.7*10^-3)

mol of HCl = 0.00026201 mol --> 0.000262 mol of HCl

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