The concentrations of solution are typically described as a ratio of the amount

Question

The concentrations of solution are typically described as a ratio of the amount of solute over the amount of solution. You may already be familiar with molarity (M), which is equivalent to the moles of solute over the liters of solution. Another measure of concentration, the mass percent of a solution, can be expressed as the grams of solute in one hundred grams of solution (% or wt%). Concentration values can serve as conversion factors that allow you to convert between the amount of solute and its corresponding amount of solution. Examples of units of concentration are shown below for an equivalent ratio of potassium iodide (KI) amount over solution amount. 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 145 lb (65.8 kg) is 929 times 10^-3 mg^What volume of a 0.0520 M KCN solution contains 9.29 times10^-3 mol of KCN? Express the volume to three significant figures and include the appropriate units. Volume = Gastric acid pH can range tom 1 to 4, and most of the acid is HCl. For a sample of stomach acid that is 1.26 times10^-2 M in HCl, how many moles of HCI are in 17.7 mL of the stomach acid? Express the amount to three significant figures and include the appropriate units. amount of HCl =

Explanation / Answer

We know that molarity,M= number of moles / volume in L

Part A :

Volume of KCN,V= number of moles/ molarity

V= 9.29*10^-3 mol / 0.0520 M

V= 0.178 L

Part B

Number of moles of HCl,n = molarity * volume in L

n=1.26*10^-2 mol * 17.7 mL*10^-3 L/mL

n= 2.23*10^-4 mol

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