amount of substance Flashcards
define relative molecular mass
the average mass of the naturally occurring isotopes of a compound, compared to 1/12 mass of a carbon-12 atom (ionic compounds do not exist as individual molecules, they exist as lattices, so for them it is known as relative formula mass)
define relative atomic mass
the average mass of the naturally occurring isotopes of an atom compared to 1/12 mass of an atom of carbon-12
define the avogadro constant
number of particles/atom/molecules in one mole of a substance
define percentage yield
the % of of a product produced from a reaction, compared to a theoretical maximum
percentage yield formula
mass of desired product/theoretical mass of desired product x 100
what can the percentage yield be used to investigate
the efficiency of practical techniques and whether reactions proceed as estimated
define atom economy
the % of reactants made into the certain desired product
atom economy formula
Mr of desired product/the sum of Mr of all products x 100
what can the atom economy of a reaction be used to investigate?
the efficiency of using a specific reaction to produce a product
ideal gas equation w units
PV = nRT
pressure in Pa
volume in m^3
gas constant = 8.31JK^-1mol^-1
temperature in K
what are standard conditions
25ºC/298K
1atm/100kPa
how to convert between C and K
C + 273
define empirical formula
the simplest whole number ratio of atoms in a compound (eg C6H6 = CH)
equation linking n c v
n = c x v
equation linking m Mr n
m = n x Mr
