C3:Quantitive chemistry Flashcards
what does the law of conservation of mass state
no atoms are lost or made during a chemical reaction
how do you calculate mr
sum of all relative atomic masses
how do you calculate percentage abundance
(mass number of isotopes 1percentage abundance of isotope 1)+(mass number of isotope 2percentage abundance of isotope 2)/100
how do you calculate the percentage of mass in a compound
ar/mr x 100
what are isotopes
atoms of an element with a different number of neutrons
name two ways to calculate moles
mass/ar or mass/mr or concentration x volume
when would you use the second formula
in a compound
what dies one mole of a substance contain
same number of particles, atoms, molecules or ions as one mole in another substance
what is avargrados constant
6.02*10^23
what is a limiting reactant
limits the amount of products that can be used
what is the coverstion between cm^3 and dm^3
1dm = 1000 cm
