The standard enthalpy change for the following reaction is 656 kJ at 298 K. 2 KI(s) 2 K(s) + I2(s) ΔH° = 656 kJ

What is the standard enthalpy change for this reaction at 298 K?

K(s) + 1/2 I2(s) KI(s)

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)