Question

Please answer it ALL completely and write clearly, thank you.

1 Describe the concepts/items s given below, use appropriately labelled diagrams if needed: Energy level diagram showing one molecular absoption process in NH3 b) Calibration curve for atomic absorption measurement of Pb in an unknown solution (no graph paper is needed) c) Time-of-flight mass analyser in mass spectrometry d) Interface for capillary gas chromatography-mass spectrometry (GC-MS), detailing specifically the interface from the end of the GC column to the entrance into the MS chambe e) Isotope ratio and elemental ratio for the compound (C6H5)CHCIBr

          ( 20 Marks , PLS answer Complete )

Answer 1

Answer A:

the formation of ammonia. Nitrogen gas (N₂) and hydrogen gas (H₂) can be made to combine to form NH₃, or ammonia gas. As we proceed, look for the answers to these questions: Is the reaction exothermic? How many kilograms of hydrogen are needed to produce one kilogram of ammonia?

The reaction is N₂ + 3H₂ 2NH₃

adivation energy 3( H, H atoms sep ar ated 537 kcal activation ener gy 568 kcal potential energy 2 N2+ 3H (reactants) 3H2 2 2 NH 2 NH3 (product Figure 18: Energy Level Diagram for the formation of Ammonia (NH3)

Answer B:

Time-of-Flight

Mass spectrometry is an analytical method that determines the mass-to-charge ratio (m/z) of ions. Molecules are ionized in the source and accelerated by an electric field into the analyzer. In time-of-flight (TOF) mass spectrometry (see Figure 1), the analyzer is a chamber under vacuum that contains no electric fields. The ions drift through the analyzer with the kinetic energy obtained from the potential energy of the electric field. The kinetic energy the ions obtain is defined by Equation 1 where eV is the potential energy of the electric field, KE is the kinetic energy, m is mass-to-charge ratio, and v is velocity.