a sample of bromine was analysed in a time of flight (tof) mass spectrometer and
found to contain two isotopes, 79br and 81br
after electron impact ionisation, all of the lons were accelerated to the same
kinetic energy (ke) and then travelled through a flight tube that was 0.950 m long.
the 79br+ lons took 6.69 x 10^-4 to travel through the flight tube.
calculate the mass, in kg, of one lon of 79br+
calculate the time taken for the 81br+ ions to travel through the same flight tube.
the avogadro constant, l = 6.022 x 10mol!
ke = 5 roy? where m = mass (kg) and v= speed (m 3-')
where d = distance (m) and t = time (s)
(5 marks)