Stearic acid is saturated, with 18 carbons counting the carboxyl carbon…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Stearic acid is saturated, with carbons counting the carboxyl carbon. Oleic acid also has carbons, but one double bond. Use atomic masses , and .
- How many hydrogens does stearic acid have?
- How many does oleic acid have?
- What is the mass of stearic acid?
- What is the mass of oleic acid?
- Which of the two is more likely to be a liquid at room temperature?
Need a reminder? The key ideaShow
Sucrose is glucose and fructose, lactose is glucose and galactose, maltose is two glucose units. Starch, glycogen and cellulose are chains of glucose; inulin is fructose; chitin is an amino sugar. Starch with iodine is blue. A saturated fatty acid with c carbons is C(c) H(2c) O2, and each double bond removes two hydrogens. With atomic masses C 12, H 1, O 16, palmitic acid is 256 Da. Fats and oils are glycerides; lecithin is a phospholipid. Joining units releases one water at each join.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) .
Step 2. (b) .
Step 3. (c) .
Step 4. (d) .
Step 5. (e) The double bond makes oleic acid unsaturated, and its fats have the lower melting point. So oleic acid is more likely to be liquid.
Answer: ; ; ; ; oleic acid.
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