5. Given the following data: + %O2(g) B2H6(g) + 302(g) + ½O2(g) H2O(1) 2B(s) B2O3(s) AH = -1273 kJ/mole B2O3(s) + 3H20(g) H2O(1) H2O(g) AH = -2035 kJ/mole H2(g) AH = -286 kJ/mole %3D AH = 44 kJ/mole Calculate AHrxn for the following reaction: 2B(s) + 3H2(g) B2H6(g) -> + 3/202(g) Reverse (b) B2O3(s) + 3H2O(g) 3x (c) 3H2(g) + 3/202(g) 3H20(1) (a) 2B(s) B2O3(s) B2H6(g) + 302(g) 3H2O(1) 3H20(g) AH = -1273 kJ/mole AH = +2035 kJ/mole %3D AH = -858 kJ/mole %3D Зx (d) AH = 132 kJ/mole 2B(s) + 3H2(g) - B2H6(g) AH = +36 kJ/mole %3D The reaction is ENDOTHERMIC because AH is positive

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Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.