Answer:
The molecular formula of pyrogallol is: C6H6O3
Step-by-step explanation:
Step 1: Data given
Empirical formula of pyrogallol is C2H2O
Molar mass of pyrogallol = 126 g/mol
Molar mass of Carbon (C) = 12 g/mol
Molar mass of hydrogen (H) = 1.01 g/mol
Molar mass of oxygen (O) = 16 g/mol
Step 2: Calculate molar mass of the empirical formula
2*12 + 2*1+ 16 = 42 g/mol
Step 3: Calculate the molecular formula
To find the molecular formule , we should multiply the empirical formula by n
n can be found by dividing molar mass of pyrogallol by the molar mass of the empirical formula
n = 126 g/mol / 42 g/mol ≈ 3
We should mulitply the empirica lformula by 3
3*(C2H2O) gives C6H6O3
if we calculate the molar mass now:
6*12 +6*1 + 3*16 = 126 g/mol
The molecular formula of pyrogallol is: C6H6O3