Amount of substance Flashcards
Avogadro’s Law
Equal volumes of all gases, at the same temperature and pressure, have the same number of molecules.
V1/n1= (where v=volume and n=moles)
V2/n2
value of avogadros constant
24dm^3
room temperature and pressure
298K, 1atm
The ideal gas law states
that the pressure, temperature, and volume of gas are related to each other.
pV = (p=pressure, V=volume)
nRT (n=moles, R=gas constant, T=temperature in kelvins)
what is pressure measured in for ideal gas law
Pascals
what is volume measured in for ideal gas law
metres cubed
gas constant value and units
8.31 Jmol^-1K^-1
percentage yield calculation
(actual yield/ theoretical yield) x100
atom economy calculation
(Molar Mass of Desired Product/ Molar Mass of all Reactants) ×100
methyl orange colours
red in acidic, orange in alkaline
phenolphthalein colours
colourless in acidic, pink in alkaline
c1v1 = (c=concentration, v=volume)
c2v2
Accuracy
A measurement of the closeness in agreement between an individual result and the accepted value.
Precision
A measurement of the closeness in agreement between independent measurements which may not be the correct value at all.
Systematic error
Errors which cause readings to differ from the true value by a consistent amount each time a measurement is made.
Random error
Errors which cause readings to differ from the true value by an unpredictable way from
one measurement to the next.
percentage error calculation
(maximum error/ value of measurement) x100
