#Chem 161-2007 homework 12th week

#Chem 161-2007 homework 12th week - Chem 161-2007 Homework...

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

View Full Document Right Arrow Icon
Chem 161-2007 Homework 12 th Week Chapter 9 problems: 75, 77, 83 Chapter 10 problems: 3,21,23,25,29 CHAPTER 9 Bond Lengths and Bond Energies 75. The enthalpy of vaporization of carbon is C(graphite) → C(g) ∆H = 717 kJ Use this value, the enthalpy of formation of methane, and the bond-dissociation energy of hydrogen to calculate a value for the carbon-to-hydrogen single bond energy. Compare your result with the value listed in Table 9.1. C(graphite) → C(g) ∆H = 717 kJ C(graphite) + 2H 2 (g) → CH 4 (g) ∆H f = -74.81 kJ H-H(g) → 2H(g) ∆H bd = 436 kJ The bonds in the graphite have to be broken to release the C atoms. -717 2 x -436 4 x -X C(graphite) + 2H 2 (g) → CH 4 (g) ∆H = -74.81 kJ -74.81 = (4 x -X) – ((2 x -436) + -717) X = 416 kJ Table 9.1 has the C-H bond as 414 kJ/mol, so this is in very good agreement. Alkenes and Alkynes 77. Give the condensed structural formula for each of the following. (a) propene
Background image of page 1

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

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 5

#Chem 161-2007 homework 12th week - Chem 161-2007 Homework...

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

View Full Document Right Arrow Icon
Ask a homework question - tutors are online