Evaluating statements on ethane and ammonia structures

Steps:

• Identify formulas: ethane is C₂H₆ (6 H atoms), ammonia is NH₃ (3 H atoms).
• Check statement 1: 6 H in ethane is twice 3 H in ammonia, so correct.
• Check statement 2: Nitrogen (atomic number 7) has electron configuration [He] 2s²2p³, with 5 valence electrons, so correct.
• Check statement 3: Ethane's C-C bond is a single covalent bond sharing 2 electrons (one from each C), so correct.

Why A is correct:

• All three statements align with molecular formulas and bonding rules: C₂H₆ has 2× H of NH₃, N has 5 valence electrons, and C-C is a single shared pair.

Why the others are wrong:

• B omits statement 3, but C-C bonding is accurate.
• C omits statement 2, but N valence electrons are 5.
• D omits statement 1, but H atom count is 2:1 ratio.

Final answer: A