Final answer:
The pair that shares the same empirical formula is A. C2H4 and C6H6, both reducing to the empirical formula CH. The empirical formula of glucose, with a molecular formula of C6H12O6, is CH2O.
Step-by-step explanation:
The question poses a comparison of substances to determine if any possess identical empirical formulas and requires the calculation of the empirical formula for glucose (C6H12O6).
To identify which pair shares the same empirical formula, we need to reduce each molecular formula to its simplest ratio of elements:
- A. C2H4 (ethene) and C6H6 (benzene) both reduce to CH (1:1 ratio).
- B. CH2 does not exist as a stable molecule but CH2 units are found in larger hydrocarbons and CH4 (methane) reduces to CH4.
- C. CH3 is not a complete molecular formula, but assuming it refers to a methyl group, it differs from C2H6 (ethane), which reduces to CH3.
- D. CH (carbide ion) and C2H4 (ethene), reduce to CH and CH2 respectively.
Therefore, the pair that shares the same empirical formula is A. C2H4 and C6H6.
Regarding the empirical formula of C6H12O6 (glucose), we find that the simplest whole-number ratio of C to H to O atoms is 1:2:1. This yields the empirical formula CH2O.