Molecular formula from empirical formula and molar mass

Steps:

• Calculate molar mass of empirical formula CH: atomic mass of C is 12, H is 1, so 13.
• Compute multiplier n = molecular mass / empirical mass = 70 / 13 ≈ 5.38.
• n must be an integer for the molecular formula to be a whole multiple of the empirical formula.
• No integer n yields exactly 70 (e.g., n=5 gives 65, n=6 gives 78).

Why C is correct:

• Not applicable; no option matches.

Why the others are wrong:

• A: Mass 13, too low.
• B: Mass 26, too low.
• D: Mass 65, close but not 70.

Not enough information. Final answer: Not enough information.