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EXPERIMENT 3 INTERPRETING MASS SPECTRA OF MOLECULES AIM To identify all the peaks in the given spectra Assuming that each peak is due to a singly charged species Also assume that one isotope for each element except chlorine METHOD Identify the peak present in the mass spectrum of argon gas Identify the peaks present in the mass spectrum of nitrogen gas Identify the peaks present in the mass spectrum of nitrogen dioxide Identify the peaks present in the mass spectrum of methane consisting of carbon and hydrogen only Identify the peaks present in the mass spectrum of difluoromethane consisting of carbon hydrogen and fluorine Identify the peaks present in the mass spectrum of chloromethane CH3Cl RESULTS DISCUSSION In my results above I have identified the mass spectra of argon gas nitrogen gas nitrogen dioxide methane difluouromethane and choloromethane To be able to draw a mass spectrum a mass spectrometer is used A mass spectrometer can be used to determine relative isotopic atomic and molecular masses using the 12C scale Below is a picture of a mass spectrometer A mass spectrometer can determine relative masses of substances by first converting the substance to a gas this is done by heating the substance in region A The mass spectrometer is kept at a high vacuum so as the particles of the substance dont collide with other substances In region B the particles are converted from neutral atoms or molecules into positive ions In region C these positive ions are accelerated by the high electrical potential difference between the two parallel electrodes wit hholes in their centres This causes the particles to deflect Those with a greater mass will deflect towards x but wont deflect as much as a lower mass which strikes the wall at y Some particles continue and strike the detector plate these are ions that hit at E which is the detector plate and then there mass is recorded
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