Amount of Substances Flashcards
what is the equation linking moles, mass and Mr?
moles = mass/mr
what is the equation for the number of particles?
number of particles = moles x 6.02x10(23)
what is the equation for calculating moles when gas volume is given(RTP)?
moles=volume/ 24dm3(24000cm3)
what is the equation for ideal gas?
pV=nRT
what are the units for the pV= nRT equation?
p=pressure(Pa)
v=volume(m3)
n=moles
R=8.314
T=temperature(Kelvin’s)
how do you go from kPa to Pa?
x1000
how do you go from cm3 to m3?
x10-6
how do you go from dm3 to m3?
divide by 1000
what is the equation linking moles, concentration and volume?
concentration = moles/ volume
how do you do from gdm-3 to moldm-3?
divide by mr
what is the equation for atom economy?
mass of desired product/ mass of all products x100
what is the equation for percentage yield?
actual amount of product/ theoretical amount of product x100
why is it sustainable to have a high atom economy?
- less chemical waste is produced
- less money wasted
- chemistry is more sustainable
how can we improve atom economy?
- reduce mr of unwanted products
- find another use of the unwanted products
why do we heat until a constant mass in water of crystallisation?
to make sure all of the water is removed
what is the mole?
unit for amount of substance
what is empirical formula?
the simplest whole number ratio of atoms of each element present in a compound
what is molecular formula?
the number and type of atoms of each element in a molecule
