Answer:
The molecular formula = C6H6
Explanation:
Step 1: Data given
Mass of compound X = 5.00 grams
Mass of products =
CO2 = 16.39 grams
H2O = 3.46 grams
Molar mass CO2 = 44.01 g/mol
Molar mass H2O = 18.02 g/mol
Molar mass C = 12.01 g/mol
Molar mass H = 1.01 g/mol
Molar mass O = 16. 0g/mol
Step 2: Calculate moles
Moles = mass / molar mass
Moles CO2 = 16.93 grams / 44.01 g/mol
Moles CO2 = 0.385 moles
Moles C = 1* 0.385 = 0.385 moles
Moles H2O = 3.46 grams / 18.02
Moles H2O = 0.192 moles
Moles H = 2* 0.192 = 0.384 moles
Step 3: Calculate mass
Mass = moles * molar mass
Mass C = 0.385 moles *12.0 g/mol
Mass C = 4.62 grams
Mass H = 0.39 grams
Mass O = 5.00 - 4.62 -0.38 moles
Mass O = 0 grams
Step 4: Calculate mol ratio
We divide by the smallest amount of moles
C: 0.385 moles / 0.384 = 1
H: 0.384 moles / 0.384 = 1
The empirical formula is CH
This molecular formula is 13 g/mol
We have to multiply the empirical formula by n
n = 78 g/mol / 13 g/mol
n = 6
The molecular formula = 6*(CH) = C6H6
