Module 2 Chapter 3
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What is the mol and what is its units
The amount of a substance is the number of moles. The unit of a mole is (mol)
What is avogrado’s constant
Is the number of particles per mole, 6.02 x 10^23 mol^-1.
What can the particles be in avogrados constant
Atoms, electrons, molecules
What does one mole for a substance contain
One mole of a substance contains the same number of entities as there are atoms in 12.0g of carbon 12.
Mol formula
Mol = mass/molar mass
Avogrados constant formula
Mol = number of particles/avogrado’s constant
What is the formula for percentage composition by mass
the mass of the element in 1 mol of the substance/ the compounds mr x 100
What is empirical formula
The simplest whole number ratio of each element present in a compound
What is relative molecular masses
Calculated by adding the relative atomic masses of the elements making up a molecule
What is relative formula mass
Calculated by adding together the relative atomic masses of the elements in the empirical formula.
What are liquids and gases measured by
Volume
How many cm3 are in a ml
1 cm3 = 1ml
How many decimetres3 are in a cm3
1000
What is the formula for concentration
Moles/volume(dm3)
What is a standard solution
A solution of a known concentration.
How is a standard solution prepared
It’s prepared by dissolving an exact mass of solute into solvent and making up the solution to an exact volume.
How do u work out the mass required for a standard solution
We use the mol
What happens at the same temperature and pressure
Equal volumes of gas have the same molar volume
What is the molar gas volume
24dm3
What is the formula for molar gas volume
24=volume/moles
What are the 4 assumptions when using the ideal gas equation
• Random motion • Elastic collisions (no loss of kinetic energy) • Negligible size • No intermolecular forces
What is the ideal gas equation
Pressure x volume = temperature x mol x ideal gas constant (8.314)
What are the units of the ideal gas equation
Pressure - pa Volume = m3 Moles = moles Temperature = kelvin Ideal gas constant - 8.314
How to convert cm3 to m3
X 10 ^-6