Elemental analysis of a compound showed that it consisted of 81.82% carbon and 18.18% hydrogen by mass, how many hydrogen atoms appear in the empirical formula of the compound?
For this kind of problem, we have to assume that you have 100g unknown sample (since the percentages add up to 100%).
Thus, masses are C = 81.82 g; H = 18.18 g
Since chemical formulas deal with number of moles more than their respective weights, we need to multiply the masses with their respective atomic weights to get the number of moles.
Next, to get the ratio of atoms to each other, we would need to divide the number of moles by the smallest number of mole.
Now, since the number of
Therefore, the empirical formula is