The diagram shows the molecular structure of propane. What is the chemical formula for propane?

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

Answer: (B)

Verified step by step guidance

1. Identify the number of carbon atoms in the propane molecule. The prefix 'prop-' indicates that there are 3 carbon atoms.
2. Determine the number of hydrogen atoms in the molecule. For alkanes (saturated hydrocarbons), the general formula is \(C_nH_{2n+2}\), where \(n\) is the number of carbon atoms.
3. Apply the formula for alkanes to propane: with \(n=3\), calculate the number of hydrogen atoms as \$2(3) + 2$.
4. Write the chemical formula by combining the number of carbon and hydrogen atoms: \(C_3H_8\).
5. Compare the options given and select the formula that matches \(C_3H_8\), which is the correct chemical formula for propane.