Question

Can calcium chloride be a gas?

Answer 1

It can, but not at ordinary temperatures. On a quick google search, one finds the normal boiling point of `"CaCl"_2` to be `1935^@ "C"`, or `"2208.15 K"`, i.e. at `"1 atm"`.

If you really wanted to find `"CaCl"_2(g)`, you'd have to place it in an extremely hot flame, and you won't be able to easily achieve that.

For example, a propane torch generates flames generally around `"2268 K"`, while an oxyacetylene combustion generates a flame temperature up to around `"3573 K"`. Ordinary candles are around `"1373 K"`.