Answer
Step 1: Calculate the number of moles of carbon, hydrogen and oxygen
Carbon: 5.558 moles
|
Hydrogen: 11.1 moles
|
Oxygen: 1.3875 moles
|
Step 2: Divide by the smallest answer to get the ratio
Carbon: 4
|
Hydrogen: 8
|
Oxygen: 1
|
Step 3: State the empirical formula
-
- The empirical formula is C4H8O
Step 4: Calculate the amount in moles, using PV = nRT
-
- n = 1.875 x 10-3 moles
Step 5: Calculate the molar mass
-
- Molar mass 72
Step 6: Deduce the molecular formula
-
- The empirical formula, C4H8O, has a mass of (4 x 12.0) + (8 x 1.0) + 16.0 = 72.0
- Therefore, the molecular formula is also C4H8O