Answer:
The molecular formula is C₆H₁₂
The empirical formula is CH₂
Explanation:
Percent by mass, means that in 100 g of compound we have:
85.7 g of C
14.3 g of H
Let's make a rule of three with the molar mass to determine the amounts of the elements:
In 100 g of compound we have 85.7 g of C
In 84 g of compound we would have (84 . 85.7) / 100 = 72 g of C
In 100 g of compound we have 14.3 g of H
Then, in 84 g of compound we would have (84 . 14.3) / 100 = 12 g of H
Now let's determine the moles of each element
72 g of C / 12 g/mol = 6 mol of C
12 g of H / 1 g/mol = 12 mol of H
Then, the molecular formula is C₆H₁₂
The empirical formula is CH₂
