Equations
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How do you work out moles of a solid?
n = m / mr • n - moles • m - mass (g) • mr - molar mass/relative molecular mass (g mol-1)
How do you work out moles of a liquid?
n = c x v • n - moles • c - concentration (mol dm-3) • v - volume (dm3) x 1000 dm3 <———-> cm3 ÷ 1000
How do you work out moles of a gas?
n = v / 24 n - moles v - volume (dm3) 24 - molar gass volume (dm3mol-1) • applicable at 298K and 1atm
What is the ideal gas equation?
pV = nRT p - pressure (Pa) V - volume (m3) n - moles R - gas constant, 8.314 T - temperature (K) or (ºC + 273)
What is Avogadro’s Constant?
6.02 x 1023
How do you work out moles from number of particles?
n = number of particles ÷ (6.02 x 1023)
How do you work out number of atoms?
number of particles = moles x (6.02 x 1023) • make sure if the particles are molecules that you multiply the total number by the number of atoms in that particle • E.g. H2S = 30 particles –> 30 x 3 = 90 atoms