chm151-7solns

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

This preview shows pages 1–2. Sign up to view the full content.

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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 3

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online