In a TOF mass spectrometer, an ion of an isotope of selenium, with mass number yyy, travels along a 1.60 m1.60\text{ m}1.60 m flight tube with a kinetic energy of 1.66×10−12 J1.66 \times 10^{-12}\text{ J}1.66×10−12 J.
The ion takes 3.20×10−7 s3.20 \times 10^{-7}\text{ s}3.20×10−7 s to reach the detector.
KE=12mv2 KE = \frac{1}{2} mv^2 KE=21mv2where:
Calculate the mass, in g\text{g}g, of 111 mole of these selenium ions.
Use your answer to suggest the mass number yyy of this selenium isotope.
The Avogadro constant, L=6.022×1023 mol−1L = 6.022 \times 10^{23}\text{ mol}^{-1}L=6.022×1023 mol−1.
