C. Answer the given questions based on the graph shown below. The given
graph is the heating curve of naphthalene.
1. At what temperatures does naphthalene exist as a solid?
2. At which point (A, B, C, or D) does naphthalene start to melt?
3. Which point(s) is the melting stage? How is the temperature described at
this stage?
4. At which point has all the naphthalene melted?
5. Which points in the graph represents the heat of fusion of naphthalene?