Question

Question #db5fb

Answer 1

Just looking at a formula it is difficult to determine – although the molecular mass may give some clues.

Explanation:

Additionally, to determine the phase state of a compound we need to know the conditions of temperature and pressure. Further, “aqueous” in the list usually refers to being in a water solution. A compound may or may not have much solubility in water, but that is a different consideration from the physical phase of the pure compound.

Using “Normal” temperature (20’C) and pressure (1 atm) `CO_2` is a gas, `H_2O` can be either liquid or gas, MgO, NaCl, `AlCl_3, KNO_3, PbI_2, CuCO_3` and Cu are all solids. All of them except elemental copper can be put into an aqueous solution.

At elevated pressure `CO_2` can become a liquid, and at very low temperature it becomes a solid, as does `H_2O`.