![]() An atom of sulfur-32 has a mass of 31.972 amu 31.972 amu. For example, one atom of helium-4 has a mass of 4.0026amu 4.0026 amu. The mass of any isotope of any element is expressed in relation to the carbon-12 standard. By measuring the relative deflections of the ions, chemists can determine their mass-to-charge ratios and thus their masses. An atomic mass unit is defined as a mass equal to one twelfth the mass of an atom of carbon-12. Note that the lighter 35Cl + ions are deflected more than the heavier 37Cl + ions. If you add the masses of six protons and six neutrons, you get 12.09. The actual mass of a proton is about 1.007 amu, and the mass of a neutron is about 1.008 amu. One atomic mass unit is the mass of a proton, or about 1.67 × 10 -27 kilograms, which is an extremely small mass. ![]() Theoretically, this would mean that each proton and each neutron has a mass of one amu, but this turns out not to be so. ![]() The extent to which the ions are deflected by the magnetic field depends on their relative mass-to-charge ratios. Carbon-12 has a mass of 12 amu by definition. To determine the atomic mass of neon, the average of the isotopes need to be extracted: 0.9048 × 19.992 18. The atomic mass unit of the gas is 21.991, and the abundance of the gas is 9.25. neon-22: It is made up of ten protons and twelve neutrons. The ions are then accelerated into a magnetic field. The atomic mass unit of the gas is 20.994, and the abundance of the gas is 0.27. (a) When a sample of elemental chlorine is injected into the mass spectrometer, electrical energy is used to dissociate the Cl 2 molecules into chlorine atoms and convert the chlorine atoms to Cl + ions.
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