Question

Assume you heat 30 g of water until it all turns into gas. At standard conditions, what volume will this water occupy?
Answer in units of liters.

Answer 1

30 grams is how many mols? That's mols = g/molar mass = 30/18 = estimated 2 mols but you need to do it more accurately.
Then you know that 1 mol will occupy 22.4 L at STP. Convert moles you have to L.