Which of the following is the correct molecular formula for propane?

• A. C4H10
• B. C2H6
• C. C3H8
• D. CH4

Answer: (C)

Verified step by step guidance

1. Understand that the molecular formula represents the actual number of atoms of each element in a molecule.
2. Recall that propane is an alkane, which follows the general formula for alkanes: \(C_nH_{2n+2}\), where \(n\) is the number of carbon atoms.
3. Identify the number of carbon atoms in propane, which is 3, so substitute \(n=3\) into the formula: \(C_3H_{2(3)+2} = C_3H_8\).
4. Compare the given options to the formula \(C_3H_8\) to find the correct molecular formula for propane.
5. Confirm that \(C_3H_8\) matches the correct molecular formula for propane, distinguishing it from other options like \(C_4H_{10}\) (butane), \(C_2H_6\) (ethane), and \(CH_4\) (methane).