Looking at the graph, we see that as more heat is added the temperature increases. However, we also see that there are some “flat” lines present. What do these flat lines represent?

Just took the quiz on edgenuity and the correct answer is "c.  4.54 x  10–12  j"

The answer to this qustion is c

3-isopentane; 3-methylbutane, and 1,2-methylpropane do not meet iupac rules, so they are wrong names.the only valid name onthe list is 2-methylbutane, which is the same isopentane.this is its formula:                   ch2                    |ch3 - ch - ch2 - ch3answer: 2-methylbutane