Question

question 10 of 10
how does one determine a molecular formula from the empirical formula?

a. multiply subscripts in the empirical formula by \\(\frac{\text{molar mass}}{\text{empirical formula mass}}\\)

b. multiply subscripts in the empirical formula by \\(\frac{\text{empirical formula mass}}{\text{molar mass}}\\)

c. multiply subscripts in the empirical formula by \\(\frac{\text{grams of element}}{\text{molar mass}}\\)

d. multiply subscripts in the empirical formula by \\(\frac{\text{molar mass}}{\text{grams of element}}\\)

Explanation:

To determine the molecular formula from the empirical formula, we first find the ratio \( n=\frac{\text{molar mass of compound}}{\text{empirical formula mass}} \). Then we multiply the subscripts in the empirical formula by this ratio \( n \). So the correct approach is to multiply the subscripts in the empirical formula by \( \frac{\text{molar mass}}{\text{empirical formula mass}} \), which corresponds to option A.

Answer:

A. Multiply subscripts in the empirical formula by \(\frac{\text{molar mass}}{\text{empirical formula mass}}\)