You will most lkely get better answers if you postb this under spanish
Answer: C4O2 or O=C=C=C=C=O.
You have to provide options, otherwise people will not reply to your question.
It's usually water and a type of salt take the reaction between hydrochloric acid and sodium hydroxide HCl(aq)+NaOH(aq) yeilds NaCl(aq) and H2O(l)
The metal conducts the heat and through conduction, cooks the brownies; conduction also cooks the brownies in the glass pan, but since infrared goes right through the glass, they also cook by radiation.
