Which shows the correct relationship between the molecular formula and the empirical formula for C2H10N2?

A. molecular formula = 2 x empirical formula

B. empirical formula = 2 x molecular formula

C. molecular formula = 62.1 x empirical formula

D. empirical formula = 14 x molecular formula

The correct answer is A. molecular formula = 2 x empirical formula

The given compound C2H10N2 is the molecular formula because the ratios of the elements are not reduced into lowest terms (empirical formula). To get the empirical formula, the ratios must be reduced to the smallest possible integral ratio which gives CH5N. As a result, the ratio between both formulas is 2.