Here's how to figure out the number of carbon atoms and hydrogen molecules needed to make two molecules of methane (CH4):

1. The Chemical Formula:

* Methane's chemical formula is CH4, meaning each molecule has one carbon atom (C) and four hydrogen atoms (H).

2. Doubling the Formula:

* To make two molecules of methane, we need to double the number of carbon and hydrogen atoms:

* Carbon: 1 atom/molecule * 2 molecules = 2 carbon atoms

* Hydrogen: 4 atoms/molecule * 2 molecules = 8 hydrogen atoms

3. Converting to Molecules:

* Remember that hydrogen exists as a diatomic molecule (H2), meaning two hydrogen atoms are bonded together.

* To get the number of hydrogen molecules, divide the total number of hydrogen atoms by 2:

* 8 hydrogen atoms / 2 atoms/molecule = 4 hydrogen molecules

Answer:

* You need 2 carbon atoms and 4 hydrogen molecules to make two molecules of methane.