AQA AS Jun 2016 Paper 1 Q6

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12in a time of flight (TOF) mass spectrometer. . 1 Explain how ions are accelerated, detected and have their abundance determined [3 marks] 0 6 0 6 . 2 Calculate the mass, in kg, of a single 52Cr+ ion. Assume that the mass of a 52Cr+ ion is the same as that of a 52Cr atom. (The Avogadro constant L = 6.022 x 1023 mol1) [1 mark] 0 6 . 3 In a TOF mass spectrometer the kinetic energy (KE) of a 52Cr+ ion was 1.269 x 1013 J Calculate the velocity of the ion using the equation. (m = mass/kg and v = velocity/ms1) KE=12mv2 [2 marks] *12* M/JUN16/7404/1<br />
 130 6 . 4 Bromine has two isotopes, 79Br and 81Br, in approximately equal abundance. In a TOF mass spectrometer bromine forms ions with formula [Br2]+ Sketch the pattern of peaks you would expect to see in the mass spectrum of a sample of bromine. [2 marks] 0 6 . 5 A sample of xenon has Ar = 131.31. The sample consists of four isotopes. The abundances of three of the isotopes are shown in Table 3. The data for one of the isotopes, mXe, is missing. Table 3 131Xe Isotope 129Xe 132Xe mXe abundance 28.0 25.0 27.0 To be calculated Use the data to calculate the abundance of isotope mXe and calculate m, the mass number of mXe. Show your working. [4 marks] Turn overM/Jun16/7404/1 *13*<br />

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