Lauric acid is the main fatty acid in coconut oil and is currently being studied for potential health benefits. This white, powdery substance remains solid at room temperature (23°C). To investigate the physical properties of lauric acid, students added 15 g of lauric acid and 15 g of water to a test tube and placed it in a 60°C water bath (see Figure 1) to melt the sample.
When the test tube registered 60°C, the students removed the test tube from the heated beaker and placed it in a second water bath that was 23°C (see Figure 1). They recorded the temperature of the sample every 20 seconds until the sample solidified. Results are shown in Figure 2.
When the lauric acid sample reached 38°C, the students removed it from the 30°C water bath and placed it back in the 60°C bath. They recorded the temperature every 20 seconds for 400 seconds. The results are shown in Figure 3.
Which of the following conclusions is best supported by the experiment?