Amount of substance Flashcards
how do you calculate the number of particles (atoms / ions etc) with avagadros constant
avagadros constant x moles
how do you calulate moles with grams and RAM
RAMS
how do you calculate relative molecular mass
add up the relative atomic masses of the present atoms
how many sig figs should calculations be to
3
how do you find mass using avagadros constant
avagadros constant
what is the formula for the following ions:
sulfate
carbonate
hydroxide
nitrate
ammonium
sulfate - So4^-2
carbonate - CO3^-2
hydroxide - OH^-1
nitrate - NO3^-1
ammonium - NH4^+
what table do you need to calculate empirical formula
% by mass
relative atomic mass
moles
ratio
how do you get the empirical formula from the ratio found in the table created
divide everything by the smallest number
what are hydrated crystals
water molecules bonded to ions in the crystal
what does a dot in a molecular formula mean
shows the amount of bonds created per mole of the first half
define anhydrous
no water
how do you work out the true number of moles in an equation
known mole coeffiiciant
what happens when the limiting reagent is used up
reaction stops
what three things determine the volume of any gas
pressure
moles
temp
what is the ideal gas equation
PV = nRT
P = pressure
V = volume
n = moles of gas
R = gas constant
T = temperature
how do you convert degrees celcius to Kelvin
+ 273
what is a standard solution
a solution with accurately known concentrations
how do you convert cm3 to dm3
divide by 1000
how do you calculate moles with concentration and volume
concentration x volume
define accuracy
how close a measured value is to its actual true value
how do you calculate the percentage error of equiptment
measurement taken
how do you calculate titre
inital - final readings
what determines if results are concordant
if they’re within 0.1cm3 of eachother
can you use all values to find the titre
no, only concordant
