An unknown substance kept in a sealed container at stp had a density of 808 kg/m3. when the container was opened and the substance was exposed to room temperature, its density became 1.25 kg/m3. which change did the substance most likely undergo?
gas to solid
liquid to solid
gas to liquid
liquid to gas

Ethene molecular fórmula= c2h4molecular weight = 29.046g/molhope it : )

Wow that a lot of text for my tiny so i no wanna answer

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).