Analysis: (1) According to the compound containing carbon element, it is called organic compound, which is called organic compound for short. Although it contains carbon, its oxides, carbonates and carbonic acids are similar to inorganic substances, so they are regarded as inorganic substances. Make a judgment.

(2) preparing a solution according to the mass ratio of each element in the compound = the relative atomic mass ratio of each element × the number of atoms;

(3) Calculate the mass fraction of carbon in "high-energy gas" first, and then find out how many grams of "high-energy gas" contains 3.6 grams of carbon.

(1) According to the compounds containing carbon elements, they are called organic compounds, which are referred to as organic compounds for short. Although oxides, carbonates and carbonic acids of carbon contain carbon, their properties are similar to those of inorganic substances, so they are regarded as inorganic substances. It can be judged that "high-energy gas" belongs to organic compounds. So, the answer is: organic;

(2) According to the mass ratio of each element in the compound = the relative atomic mass ratio of each element × the number of atoms, we can get:

The atomic number ratio of carbon to hydrogen is:

=3:8;

Therefore, the chemical formula of the compound is c3h8? So the answer is: C3H8.

(3) The mass fraction of carbon in "high energy gas" = × 100%,

Assuming that x grams of "high energy gas" contains 3.6 grams of carbon, then

X× × 100%="3.6" g gives x = "4.4" g.

A: 4.4 grams of "high energy gas" contains 3.6 grams of carbon.