foundation Flashcards
Relative isotopic mass
The mass of iostope relative to 1/12 of carbon-12 atom
Relative atomic mass
The weighted mean mass of an atom relative to 1/12 of a carbon-12 atom
Steps of mass spectroscopy
- sample is vapouried
- sample is ionised to 1+ charge
- ions are accelerated by a magnetic field
Aim of mass spectroscopy
To find the abundancy of each isotope
What does a mass spectrometry graph show?
Each peak represents the abundancy of a isotope.
Isotope
Same no. of proton but different no. of neturons
Charge of NO2 ion
1-
Charge of NO3 ion
1-
Charge of HCO3 ion
1-
Charge of MnO4 ion
1-
Charge of Ag ion
1+
Charge of SO3 ion
2-
charge of CrO7 ion
2-
Charge of Zn ion
2+
Charge of NH4 ion
1+
Charge of PO4 ion
3-
What does avogradro constant a value of?
The no. of atoms / molecules per moles
Equation of amount in gas (Room temp. and pressure)
volume (dm3) = moles * 24
Ideal gas equation
pv = nGT
Precentage yield eq.
actual/theoritical * 100 = %
Atom economy eq.
useful/total * 100 = %
Benefits of high atom economy
↓waste produced : ↑ product formed
Greater profit margin (as cost is reduced)
What may cause actual yield < theoritical yield?
- side reaction
- incompletion of reaction
- product loss during purification
dm3 –> cm3 conversion
x 1000