Answer:
The molecular formula of the compound is C6H6
Step-by-step explanation:
Step 1: Data given
Assume the mas = 100 grams
The compound contains:
92.3 % C = 92.3 grams C
7.7 % H = 7.7 grams
Step 2: Calculate moles
Moles = mass / molar mass
Moles C = 92.3 grams / 12.01 g/mol
Moles C = 7.685 moles
Moles H = 7.7 grams / 1.01 g/mol
Moles H = 7.62 moles
Step 3: Calculate mol ratio
We divide by the smallest amount of moles
C: 7.685 /7.62 = 1
H: 7.62 / 7.62 = 1
The empirical formula = CH
This formula has a molecular mass of 13.02 g/mol
Step 4: Calculate molecular mass
Molar mass = mass / moles
Molar mass = 11.08 grams / 0.142 moles
Molar mass = 78.02 g/mol
Step 5: Calculate molecular formula
For the molecular formula, we need the molecular weight:
78.02 / 13.02 = 6
We have to multiply the empirical formula by 6
6*CH = C6H6
The molecular formula of the compound is C6H6