What is mostly made up of solid water?

ice is made up of solid water

Ice

Explanation:

Ice is a solid material in which H20 molecules are pushed together.There can be different forms of ice,such as slush or others,or a completely different liquid.

Explanation:

Hello,

In this case, cobalt (II) molar mass is 280.996 g/mol since it is about heptahydrate, so we compute the moles:

Then, since we need the volume in litres only:

Finally, we compute the molarity:

So your answer should be refined.

Best regards.