AQA AS Specimen Paper 1 Q2

Answers available below

. 1 0 2 . 2 0 2 A sample of sulfur consisting of three isotopes has a relative atomic mass of 32.16 Table 1 gives the relative abundance of two of these isotopes. Table 1 Mass number of isotope Relative abundance / % 32 91.0 33 1.8 Use this information to determine the relative abundance and hence the mass number of the third isotope. Give your answer to the appropriate number of significant figures. [4 marks] Mass number = [2 marks] Describe how ions are formed in a time of flight (TOF) mass spectrometer. Barcode Typesetter code<br /> 0 2 . 3 A TOF mass spectrometer can be used to determine the relative molecular mass of molecular substances. Explain why it is necessary to ionise molecules when measuring their mass in a TOF mass spectrometer. [2 marks] Turn over for the next question Barcode Typesetter code Turn over <br />

Show answer