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- Mass of electron m₀ : 9.1 × 10⁻³¹kg Avogadro number N₂ : 6.02 × 10²³ Charge of electron ℯ : 1.6 × 10⁻¹⁹ C 1 ℯV = 1.6 × 10⁻¹⁹ J Boltzman costant k₃ : 1.38 × 10⁻²³ J/K = 8.6 × 10⁻⁵ ℯV/K R = 8.314 J/K·mol Q. The equilibrium interatomic spacing and melting point of sodium halide are as follows. Explain the reasons for the observed trend. NaF NaCI NaBr NaI interval(nm) 0.23 0.28 0.29 0.32 meltingpoint(℃) 988 801 740 660#3The quenching of tryptophan fluorescence by dissolved O2 gas was monitored by measuring emission lifetimes at 348 nm in aqueous solutions. Determine the quenching rate constant for th is process from the followingdata:
- A Uranium 235 atom has 92 protons in the nucleus and has a mass of 3.92 E-25 kg. A) How many Uranium atoms would you need to have 1.00 Coulombs of protons? B) What mass of Uranium would that be?The energy required to break one bond in DNA is 10-20 J. This value in eV is nearly4. In each of the following equations, determine the emitted particle(s) in each case. 141 La → 57 a. b. C. d. 222 Rn → 86 238 U → 92 34 226 88 218 Po + ? 84 234 Th + ? 90 34 CI→ ³4S + ? 16 Ra → 222 Rn + ? 86 e. f. g. h. 138 Nd → 60 212 Pb → 82 215 Po 84 141 Ce + ? 58 138 Pr + ? 59 212 23Bi + ? 83 211Pb + ? 82