How many moles of nitrogen gas will occupy a volume of .5l at 1.0atm and 298k

What is the mass of sodium in 3 moles of sodium chloride

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from

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)