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Atomic Mass Units and e/u
The atomic mass of an isotope is its mass in atomic mass units, where 1 u = 1.661 x 10-27 kg.
The ratio of the fundamental charge, e, to the atomic mass unit, u, is e/u = 9.65 x 107 C/kg.
1. Using Atomic Mass Units
(a) What is the mass of an isotope with an atomic mass of 19.2 u?
m = 31.89e-27
kg
(b) What is the charge-to-mass ratio of a +2Li-6 ion, which has an atomic mass of 6.015?
오 = 2.4e6
X C/kg
m

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