Which phase change at standard temperature and pressure represents sublimation? [asset] (a) co2 (s)  co2 (g) (b) h2o (l)  h2o (g) (c) co2 (l)  co2 (g) (d) h2o (s)  h2o (l)

(a)CO₂(s) ⇌ CO₂(g) is an example of sublimation.

Sublimation is the conversion of a solid directly to a gas without going through the liquid phase.

indium, and thallium have three electrons i think

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements