Question

percent composition and molecular formula
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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 × subscript of h in molecular formula
subscript of c in molecular formula = n × subscript of c in empirical formula

Explanation:

$2 \times$ subscript of H in empirical formula.

• Option4: Correct. By definition, each subscript in the molecular formula is $n$ times the subscript in the empirical formula.

Answer:

$2 \times$ subscript of H in empirical formula.

• Option4: Correct. By definition, each subscript in the molecular formula is $n$ times the subscript in the empirical formula.