13 points + brainliest.

in case you can't read the question:
question- if in the following diagram the substance is in solid form during stage 1, at what stage do the particles have no intermolecular bonding?

answer choices-
a. 1
b. 3
c. 5
d. intermolecular bonding occurs during all stages.

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final