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

1. anonymous

this is an algebra room not science

2. anonymous

opss does anyone know the answer thou?

3. anonymous

i dont thats for sure...sorry

4. anonymous

Calcium carbonate nonahydrate is a hydrous compound of calcium carbonate $$CaCO_3$$ and water $$H_2O$$. The number of $$H_2O$$ molecules is denoted by a Greek prefix in the name of the hydrate; nona- means nine. This means we can write our compound as $$CaCO_3\cdot 9H_2O$$. http://en.wikipedia.org/wiki/Hydrate#Inorganic_chemistry