What is the molecular weight of methane (CH4)?

To determine the molecular weight of methane (CH4), we need to consider the atomic weights of the elements that make up the molecule: carbon and hydrogen.

Methane consists of one carbon atom and four hydrogen atoms. The atomic weight of carbon is approximately 12.011 g/mol, and the atomic weight of hydrogen is about 1.008 g/mol.

Calculating the molecular weight of methane involves:

1. The weight contribution from one carbon atom:

• 1 atom of carbon × 12.011 g/mol = 12.011 g/mol

2. The weight contribution from four hydrogen atoms:

• 4 atoms of hydrogen × 1.008 g/mol = 4.032 g/mol

Now, we sum these contributions:

• 12.011 g/mol (from carbon) + 4.032 g/mol (from hydrogen) = 16.043 g/mol

This molecular weight can be rounded, and commonly seen as 16.0429 g/mol, making this answer the correct choice.

In summary, the molecular weight of methane is 16.0429 g/mol based on the combined weights of its constituent atoms. Understanding this calculation process is essential for solving related chemical problems.