Mole Calculations
what is the mole
the unit for the amount of substance
what is fractional distillation
the separation of crude oil
what is the general formula for alkanes
Cn H2n+2
this method extracts iron from its ore
reduction
what does percentage by mass find
name the formula that links moles, mass and Mr
Moles = mass / mr
separation is based on this property
boiling point
name the alkane with 3 hydrocarbons
propane
more reactive metals are extracted by this method
electrolysis
what is the formula for percentage by mass
percentage by mass = (ar or element x number) / Mr of compound x 100
find the moles in 20 g of argon
show working
0.5mol
where are low boiling point fractions collected?
at the top
what type of bonding occurs in alkanes
single covalent bonds
what is reduction
RIG
reduction is gain of electrons
find the percentage of 10g in a 50g solute
20%
find the mass of 2 mol of CO2
88g
why do larger hydrocarbons have high boiling points
stronger/more intermolecular forces
why are alkanes generally unreactive
strong c-c and c-h bonds
why can carbon extract copper but not aluminium
aluminium is too reactive
% of O in CO2
73%
0.25 mol reacts with a substance at a molar ratio of 1:1. what is the moles of the product
0.25
predict where a hydrocarbon with 25 carbon atoms will exit the fractionating column
in the middle
what are the products of complete combustion of methane
CO2 and H2O
what is the equation for metals reacting with acids
metal + acid --> metal salt + hydrogen
what is the empirical formula of a compound
the simplest whole number ratio of atoms present