Respuesta :
Answer:
The molecular formula is C8H16
Explanation:
Step 1: Data given
The molecular weight = 112 g/mol
The compoun contains 85.6 % C and 14.4 % H
Step 2: Calculate mass of C and H
Let's consider 100 gram of this compound
⇒ 85.6 % of C = 85.6 grams of C
⇒ 14.4 % of H = 14.4 grams of H
Step 3: Calculate moles of C
Moles C = Mass C / molar mass C
Moles C = 85.6 grams / 12.0 g/mol
Moles C = 7.13 mol
Step 4: Calculate moles of H
Moles H = 14.4 grams / 1.01 g/mol
Moles H = 14.3 moles
Step 5: Calculate the mol ratio
We divide by the smallest amount of moles
C: 7.13/7.13 = 1
H: 14.3 / 7.13 = 2
The empirical formula is CH2
The molar mass of the empirical formula is 14.02 g/mol
Step 6: Calculate the molecular formula
We have to multiply the empirical formua by n
n = 112 g/mol / 14.02 g/mol
n = 8
The molecular formula is C8H16
