Question

this is the chemical formula for acetic acid (the chemical that gives the sharp taste to vinegar): ch₃co₂h. an analytical chemist has determined by measurements that there are 3.82 moles of oxygen in a sample of acetic acid. how many moles of hydrogen are in the sample? be sure your answer has the correct number of significant digits.

Explanation:

Step1: Identify atom ratio in acetic - acid

In $CH_3CO_2H$, the ratio of hydrogen ($H$) to oxygen ($O$) atoms is $4:2 = 2:1$.

Step2: Calculate moles of hydrogen

Let $n_H$ be moles of hydrogen and $n_O$ be moles of oxygen. Since $\frac{n_H}{n_O}=2$, and $n_O = 3.82$ moles, then $n_H=2\times n_O$.
$n_H = 2\times3.82$

Answer:

$7.64$ mol