What number would you write before water in the formula for calcium carbonate nonahydrate? 4 5 7 9

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !

Imagine a small synthetic vesicle made from pure phospholipids enclosing an interior lumen containing 1 mm glucose and 1 mm sodium chloride. if the vesicle is placed in pure water, which of the following happens faster? a. na+ diffuses out. b. cl– diffuses out. c. h2o diffuses in. d. glucose diffuses out. e. sodium chloride diffuses out.

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?