1. Review the calculation for the atomic mass of carbon, which is 12.011 amu. Why is the atomic mass rounded to the thousandths place, rather than expressed to the ten-thousandths place?

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.