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PV=nRTPV = nRTPV=nRT (ideal gas equation)
Estimate relative molecular mass (MrM_rMr)
Propanone
Approximately 95°C
3−43-43−4 cm³
Difference in mass before and after vaporisation
Fill with water, transfer to graduated cylinder
Barometer
n=PVRTn = \frac{PV}{RT}n=RTPV
Mr=mnM_r = \frac{m}{n}Mr=nm
Highly flammable
So ideal gas law can be applied accurately
Mass spectrometry
Volume measurement
Gives smaller calculated MrM_rMr
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