A. Draw the structural formula (using C and H) for 2,4-dimethyloctane.

B. Based on its name, what kind of functional group would be included in a cholesterol molecule? Give the name of the functional group and draw its structure.

C. What is the pH of a weak base solution that has an [OH–] of 2.1 g 10–6 M?

B) OH functional group

Structure -OH,

Alkanol functional group

C) pOH= -log [OH] = -log[ 10^-6] = 6

pOH +pH = 14

pH = 14-6= 8

Explanation:

For A part of the question see attachment

hcl + naoh → h2o + nacl

explanation:

hcl + naoh → h2o + nacl   is the reaction that is correctly balanced.

however, pcl3 + h2 → ph3 +3hcl, 2ca+ 3cl2 → cacl3, and c5h12 + 5o2 → 5co2 + 6h2o are not correctly balanced.