Question

In which labeled portion of the curve would you use the heat of fusion to calculate the heat absorbed?
1

2

3

4

Answer 1

here is the graph

Answer 2

This, as you can see, is an enthalpy diagram, and it is asking for the heat of fusion. This is the heat required for a phase change, from liquid to solid, or basically the melting/freezing point.

Which do you think shows a phase change for this substance (it looks like water) from liquid to solid/solid to liquid.

Answer 3

4 i would say

Answer 4

since it is large

Answer 5

4 is heat of vaporization, not heat of fusion.

Answer 6

Also it has nothing to do with being large.

The length of those flat lines has to do with the energy being used to actually form/break the intermolecular forces. That's why it's flat.

Answer 7

ohhhh okay , hmm then 2 ?

Answer 8

A hint is that this diagram is basically the enthalpy diagram for water. Water freezes/melts at 0°C, so the heat of fusion is at 0°C, correct?

Answer 9

yes 2

Answer 10

ohh okay, yes that makes more sense. it would then be 2 ! awesome (: im glad i can make sense of this! thanks

Answer 11

NP (: