3.3 The mole and the Avogadro constant
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13 Terms
How can concentration be measured?
g/dm³ or mol/dm³
How much particles does one mole contain
6.02×10²³
Avogadro’s constant
How to calculate volume of gas(dm³)
Volume of gas=Number of moles of gas x 24dm³/mol
What is molar mass?
Mass of one mole of a substance(g/mol)
Element-Relative atomic mass
Compound-relative formula mass or relative molecular mass
What is the formula for amount of substance(mol)?
Mass(g)/Mr(g/mol)
How much cm³ in one dm³?
1000
What is the formula for concentration?
mol/volume(dm³)
How to calculate empirical formula?
List down elements
Write the mass of each
Calculate the moles of each(mass/Mr)
Divide all by the smallest number of moles
Multiply by the smallest number possible to make all become whole numbers
How to calculate molecular formula
Empirical formula x factor
What is the formula of factor?
Mr of molecular formula/Mr of empirical formula
What is the formula for percentage yield?
Actual yield/theoretical yield x 100
What is the formula for %composition by mass
Total mass of element in compound/Mr of compound x 100
What is the formula for %purity?
Mass of pure substance/total mass of substance x 100
Note 
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