If 4.0 mol of NO and 4.0 mol of O2 are combined, how many moles of NO2 can be produced?
2NO+O2 —> 2NO2

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)