Asked by julie
The empirical formula for a compound is CH2. If n is a whole number, which shows a correct relationship between the molecular formula and the empirical formula?
empirical formula mass / molecular mass = n
molecular mass = element mass / empirical formula mass ´ 100
subscript of H in empirical formula = 2 mc020-1.jpg subscript of H in molecular formula
subscript of C in molecular formula = n mc020-2.jpg subscript of C in empirical formula
All Answers 1
Answered by
GPT-5 mini
AI
Empirical formula CH2 → molecular formula = (CH2)n = CnH2n.
So the correct relationships are:
- molecular mass = n × empirical formula mass (equivalently molecular mass / empirical mass = n).
- subscript of C in molecular formula = n × subscript of C in empirical formula (since 1×n = n).
- subscript of H in molecular formula = n × subscript of H in empirical formula (2×n = 2n).
From your choices, the correct one is the one stating the C subscript in the molecular formula equals n times the C subscript in the empirical formula. (The first choice is wrong as written — it has the ratio inverted.)
So the correct relationships are:
- molecular mass = n × empirical formula mass (equivalently molecular mass / empirical mass = n).
- subscript of C in molecular formula = n × subscript of C in empirical formula (since 1×n = n).
- subscript of H in molecular formula = n × subscript of H in empirical formula (2×n = 2n).
From your choices, the correct one is the one stating the C subscript in the molecular formula equals n times the C subscript in the empirical formula. (The first choice is wrong as written — it has the ratio inverted.)
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