Question

question 15
0.1 pt
how many repeat empirical formula units are in \f\? input the numeric value.
a. c₄h₈ b. c₄h₁₄ c. c₆h₂₄o₁₂ d. c₄h₁₀ e. c₃h₆ f. c₅h₂₀o₁₅ g. c₆h₁₀o₄
h. n₂o₄ i. al₂o₆h₆ j. b₇o₂₈h₁₄ k. na₉sn₃o₁₂ l. n₃o₁₂h₆ m. c₈h₂₄o₄ n. c₂h₁₂o₄

Explanation:

Step1: Find the empirical formula of $C_5H_{20}O_{15}$

The greatest - common divisor of 5, 20 and 15 is 5. Divide each sub - script by 5. The empirical formula is $CH_4O_3$.

Step2: Calculate the number of empirical formula units

The molecular formula is $C_5H_{20}O_{15}$ and the empirical formula is $CH_4O_3$. The number of empirical formula units $n=\frac{\text{Molecular formula sub - script}}{\text{Empirical formula sub - script}}$. For carbon: $\frac{5}{1} = 5$, for hydrogen: $\frac{20}{4}=5$, for oxygen: $\frac{15}{3}=5$.

Answer:

5