English National Curriculum - Science
Mission Objectives
State that one mole of any gas occupies 24 dm³ at room temperature and pressure
Calculate the volume of a gas or the number of moles using mass, relative formula mass and the 24 dm³ molar volume
Determine volumes of gaseous reactants or products from a balanced equation and rearrange equations to find unknown values
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Words and meanings to learn
Avagadro constant
the number of particles in one mole of a substance, equal to 6.02 × 10²³
molar volume
the volume occupied by one mole of a gas at room temperature and pressure (RTP), which is 24 dm³ for most gases at 20°C and 1 atm
relative formula mass (Mr)
the sum of the relative atomic masses of all the atoms in a chemical formula
mole
the amount of substance that contains 6.02 × 10²³ particles, such as atoms, molecules or ions
volume of gas
the amount of space that a gas occupies, usually measured in dm³ or cm³
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