Draw and label the heat curve for ethanol with its specific melting and boiling point.

Question

Draw and label the heat curve for ethanol with its specific melting and boiling point. Identify how many and which equations would be needed to start with liquid ethanol at 21oC and turn it into ethanol gas at 100oC.

Answer 1

Hi Valerie E.,

You've asked three detailed questions on exactly the same skill set. No fair, that's spamming Wyzant. We aren't here to run your entire problem sets for you, but to help you through any hard-to-comprehend difficulties you may be having. Please limit future questions to (1) on a specific type!

-- Cheers, --Mr. d.

P.S.

So you are looking to make a graph: heating time or heat input is on the x-axis, and resultant temperature of the material is on the y-axis.

So you need to start your y-axis at somewhat below -114 C (=the freezing point of 100% ethanol) .

The curve (of the solid) is a straight line with positive slope to -114 C; then it has a flat horizontal segment (the melt). It then resumes, at a lower slope (the liquid) than before, up to 78.4 C, followed by another flat horizontal segment (the boil). After that it resumes an upward slope (the vapor) to indefinite places!

You also need to write the equations for melt from (s) to (l), and from (l) to (g).

-- Cheers, --Mr. d.