Final Exam key

Final Exam key - Chem 10 Final Exam - key Useful...

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Chem 10 – Final Exam - key Useful information: R = 0.08206 liter atm/ mol K = 8.3145 J/mol K h = 6.626 x 10 -34 J s, N A = 6.02 x 10 23 , Mass of an electron = 9.11 x 10 -31 kg, mass of a proton = 1.673 x 10 -27 kg, 1 atm = 101325 Pa = 760 torr, F=96485 coul/mol, ln(10) RT/F (T=298 K) = 0.591 V E = h ν = hc/ λ , c=3 x 10 8 m/s, E n = (n+1/2)h ν , ν = (1/2 π ) (k/ μ ) 1/2 , μ = m 1 m 2 /(m 1 +m 2 ) E J = h 2 /(8 π 2 I) J(J+1), I= μ R 2 , E n = n 2 h 2 /8mL 2 1. A certain chemical requires 200 kJ/mole to break. What is the longest wavelength photon that can break this bond? a. 1025 nm b. 598 nm c. 336 nm d. 1.13 x 10-4 nm e. 8.85 x 10 3 nm 2. The infrared spectrum of 2 H 79 Br has a peak at 1886 cm -1 . (Note that this molecule has a deuterium – the isotope of hydrogen with atomic mass number of 2.) What is the force constant of the 2 H – 79 Br bond? a. 0.137 N/m b. 28.5 N/m c. 409 N/m d. 1.18 x 10 4 N/m e. 1.26 x 10 27 N/m 3. Consider a radioactive decay in which A B, proceeding with first order kinetics. The starting mass of A is 4.5 x 10 -4 g. The mass of A at t = 15 days is 1.2 x10
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Final Exam key - Chem 10 Final Exam - key Useful...

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