science

Subdecks (2)

what is relative formula mass?
the relative atomic mass of all the atoms in a molecular formula added together
what’s the equation for calculating percentage mass of an element in a compound?
relative atomic mass x number of atoms in the compound / the relative formula mass of the compound
x100
what is the mole?
the amount of a substance
how do u calculate the number of moles? 
mass in g/ relative formula mass
what is the conversation of mass?
during a chemical reaction no atoms or destroyed or created therefore the mass remains the same
eg 2Li+F2->2LiF
if mass changes why?
there is a gas involved
how does a reactant limiting ?
if one reactant gets used up in a reaction before the rest then the reaction will stop
how do u calculate concentration?
mass of solute/ volume of solute