There are several ways to model a compound. one type of model is shown. a central c attached to 3 c's by 1 line each, each of the 3 c's being attached to 3 h's by a 1 line each. the central c is also attached by 1 line to a c, which is attached to 2 h's and a c by a single line each. the c is attached by 2 lines to an o ad by 1 line to another o. the o with 1 line is attached by 1 line to an h. what is the chemical formula for the molecule modeled?