CHEM 1101

Homework Assignment #7

Chapter 6.3-6.5, 8.1-8.2

1. What is the percent yield of the following reaction if 3.50 g of CO₂ were produced from the reaction of 10.0 g of CaCO₃ with excess HBr?

CaCO₃ (s) +2 HBr (aq) → CaBr₂ (aq) + H₂O (l) + CO₂ (g)

1. True or False. The percent yield of a reaction is an indication of its efficiency.
2. True or False. Molecules with strong intermolecular forces will generally have low boiling points.
3. True or False. Solids have a definite volume.
4. True or False. Nonpolar molecules have dipole-dipole IMFs with other nonpolar molecules.

1. What type(s) of intermolecular forces are present for each of the following molecules? a.) OF₂ (hint: the O-F bond is polar)
2. C5H12
3. CH₃CH₂CH₂OH (hint: the C-O and O-H bonds are polar) d.) O₂

7.) For each pair, which molecule is expected to have the higher boiling point and why?

a) CH₃CH₂CH₂CH₂OH vs. CH₃CH₂CH₂CH₂CH₃

1. HF vs. HBr (hint: both the H-F and H-Br bonds are polar)
2. CO₂ vs. C₁₀H₂₂ (hint: the C-O bond is polar)