Question

H2C-как называется это вещество?

Answer 1

Может, Н2S - сероводород или Н4С - метан.Ещё есть CH2 это бирадикал.Метилиден называется.

Answer 2

H2C is not a commonly recognized chemical formula or substance. I couldn't find any specific information about H2C in the search results. It's possible that H2C may refer to a specific compound or molecule that is not widely known or recognized. If you have any additional context or information about H2C, please provide it so that I can assist you further.