CHAP 2 MOLE
mariongandel
Created on August 31, 2023
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Transcript
The amount of a substance (matter quantity) is expressed in moles (mol)
How to calculate the amount of a chemical substance ?
Mass concentration of an aqueous solution
Volume of gas
Molar concentration of aqueous solution
Mass of a substance
Density
The mass concentration c is expressed in gramms per liter (g/L), it is the mass of solute in one liter of solution.
m
For ideal gases (gases where we can consider molecules as point that do not interfer wth each other), the molar volume is equal to 25 L/mol. This is a good approximation for many common gases at standard temperature and pressure. This represents the volume occupied by 1 mol of gas.
Mass of a substance
M represents the molar mass in g/mol which is the mass of 1 mole of a substance.Example : M(O) = 16 g/ mol which means 1 mole of Oxygen weighs 16 g.For a molecule you must add the atomic molar mass.
Density
The volumetric mass ρ of a solution is the mass of a solution per liter of solution (g/L).The density d has no unit it is the volumetric mass divided by the volumetric mass of water which is equal to 1g/mL. So if you have the value of the density you have the volue of the volumetric mass in g/mL.
Molar concentration of aqueous solution
The molar concentration of a solute in a solution C is given in mol/L. It is the amount of substance per liter of solution.