What is the mass percentage of carbon (C) in C2H2 (acetylene)? Provide your answer to two decimal places.

• A. 85.63%
• B. 50.00%
• C. 80.00%
• D. 92.26%

Answer: (D)

Verified step by step guidance

1. Identify the molecular formula of acetylene, which is C\_2H\_2, meaning it contains 2 carbon atoms and 2 hydrogen atoms.
2. Calculate the molar mass of each element: carbon (C) has an atomic mass of approximately 12.01 g/mol, and hydrogen (H) has an atomic mass of approximately 1.008 g/mol.
3. Calculate the total molar mass of acetylene by summing the contributions of all atoms: total molar mass = (2 \times 12.01) + (2 \times 1.008).
4. Calculate the total mass of carbon in the molecule: mass of carbon = 2 \times 12.01.
5. Find the mass percentage of carbon by dividing the total mass of carbon by the total molar mass of acetylene and multiplying by 100%: \%C = \left( \frac{2 \times 12.01}{(2 \times 12.01) + (2 \times 1.008)} \right) \times 100\%.