Amount of Substance Flashcards
What is Avogadro’s constant? What does it mean?
6.02 x 10^23- the number of particles in each mole of carbon 12
What is the mass of one mole of any substance equal to?
Relative atomic mass in grams
What equation links moles, mass, mr?
Mass= Mr x Mol
What is the empirical formulae?
The simplest whole number ration of atoms of each element in a compound
Define relative molecular mass
The mass of a molecule compared with the mass of an atom of carbon-12
Define relative formula mass
The mass of a formula unit compared with the mass of an atom of carbon-12
What is ‘analysis’?
Investigation of the chemical composition of a substance
Define ‘water of crystallisation’
Water molecules are part of their crystalline structure
What are the two assumptions made when calculating formula of a dehydrated salt?
All of the water has been lost
No further decomposition
What is 1dm^3 in cm^3?
1000cm^3
What equation links moles, volume and concentration?
moles= concentration x volume
What is a standard solution?
A solution of a known concentration
What is the molar gas volume?
The volume per mole of gas molecules at a stated temperature and pressure
What is RTP?
20 C, 101kPa
What is molar gas volume at RTP?
24.0 dm3 mol-1