What type of energy do ethanol, propane, and butane all have? Which one gives off the most thermal energy as it burns? What variable needs to be kept unchanged to make sure this comparison is fair?

Afusion reaction takes place between carbon and another element. neutrons are released, and a different element is formed. the different element is a) lighter than helium.b)heavier than helium.c)the same weight as helium.d)dependent on the element that reacted with carbon.