chm151-7solns

chm151-7solns - NOTE: the minus sign is coming out as a...

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NOTE: the minus sign is coming out as a strange symbol: Š. Tant pis . 7.1 (a) microwaves (b) red light (c) infrared light 7.5 5.0 × 10 2 nm · 10 Š9 m 1 nm = 5.0 × 10 –7 m E = hc λ = (6.626 × 10 Š34 J s)(2.998 × 10 8 m s Š1 ) 5.0 × 10 Š7 m = 4.0 × 10 –19 J/photon 4.0 × 10 –19 J/photon · 6.02 × 10 23 photons 1 mol = 2.4 × 10 5 J/mol photons 7.11 2.0 × 10 2 kJ/mol · 1 mol 6.02 × 10 23 photons · 10 3 J 1 kJ = 3.3 × 10 –19 J/photon λ = hc E = (6.626 × 10 Š34 J s)(2.998 × 10 8 m s Š1 ) 3.3 × 10 Š19 J = 6.0 × 10 –7 m (visible region) 7.15 Violet; n initial = 6 and n final = 2 7.17 (a) From n = 5 to n = 4, 3, 2, or 1 = 4 lines From n = 4 to n = 3, 2, or 1 = 3 lines From n = 3 to n = 2 or 1 = 2 lines From n = 2 to n = 1 = 1 line Total = 10 lines possible (b) Highest frequency (highest energy) n = 5 to n = 1 (c) Longest wavelength (lowest energy) n = 5 to n = 4 7.22 Δ E = – Rhc 1 n final 2 Š 1 n initial 2 = –1312 kJ/mol
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chm151-7solns - NOTE: the minus sign is coming out as a...

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