AQA Jun 2017 Paper 1 Q4

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A sample of titanium was ionised by electron impact in a time of flight (TOF) mass spectrometer. Information from the mass spectrum about the isotopes of titanium in the sample is shown in Table 2. Table 2 48 m/z Calculate the relative atomic mass of titanium in this sample. Give your answer to one decimal place. Abundance / % 74.6 46 9.1 47 7.8 49 8.5 [2 marks] Relative atomic mass of titanium in this sample 0 4 0 4 . 1 0 4 . 2 Write an equation, including state symbols, to show how an atom of titanium is ionised by electron impact and give the m/z value of the ion that would reach the detector first. [2 marks] Equation m/z value 0 4 . 3 Calculate the mass, in kg, of one atom of 49Ti The Avogadro constant L = 6.0221023 mol1 Mass [1 mark] kg *08* IB/M/Jun17/7405/1<br /> 0 4 . 4 In a TOF mass spectrometer the time of flight, t, of an ion is shown by the equation t = md 2 E In this equation d is the length of the flight tube, m is the mass, in kg, of an ion and E is the kinetic energy of the ions. In this spectrometer, the kinetic energy of an ion in the flight tube is 1.0131013 J The time of flight of a 49Ti+ ion is 9.816107 s Calculate the time of flight of the 47Ti+ ion. Give your answer to the appropriate number of significant figures. [3 marks] Time of flight Turn overIB/M/Jun17/7405/1 *09*<br />

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