OPT:
[A]. Neither;
[B]. Both;
[C]. Negative;
[D]. positive;

Answer the following question given this paragraph: Because the heat is absorbed by the system, the 177.8 kJ is written as a reactant. The heat of reaction is positive for an endothermic reaction. Q: Is the heat of reaction positive or negative for an endothermic reaction? A:
Answer:
[D].