How many moles are in 19.82 g Mg?

Why do scientists look for patterns in the world? a. patterns can explain observations. b. patterns never change, no matter what. c. patterns are easy for scientists to detect. d. patterns are all the same, through all time.

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?

Light waves can move through , but they travel fastest when they move through a(n) .